AvdyneAeroservice:.Element #3D 202-Questions

Element #3D....Good luck!...and remember you will be asked 17 questions from this pool.

(E3D1) What is reactive power?
1. Wattless, non-productive power.
2. Power consumed in wire resistance in an inductor.
3. Power lost because of capacitor leakage.
4. Power consumed in circuit Q.
(E3D2) What is the term for an out-of-phase, non-productive power associated with inductors and capacitors?
1. Effective power.
2. True power.
3. Peak envelope power.
4. Reactive power.
(E3D3) What is the term for energy that is stored in an electromagnetic or electrostatic field?
1. Potential energy.
2. Amperes-joules.
3. Joules-coulombs.
4. Kinetic energy.
(E3D4) What is responsible for the phenomenon when voltages across reactances in series can often be larger than the voltages applied to them?
1. Capacitance.
2. Resonance.
3. Conductance.
4. Conductance.
(E3D5) What is resonance in an electrical circuit?
1. The highest frequency that will pass current.
2. The lowest frequency that will pass current.
3. The frequency at which capacitive reactance equals inductive reactance.
4. The frequency at which power factor is at a minimum.
(E3D6) Under what conditions does resonance occur in an electrical circuit?
1. When the power factor is at a minimum.
2. When inductive and capacitive reactances are equal.
3. When the square root of the sum of the capacitive and inductive reactances is equal to the resonant frequency.
4. When the square root of the product of the capacitive and inductive reactances is equal to the resonant frequency
(E3D7) What is the term for the phenomena that occurs in an electrical circuit when the inductive reactance equals the capacitive reactance?
1. Reactive quiescence.
2. HighQ.
3. Reactive equilibrium.
4. Resonance.
(E3D8) What is the approximate magnitude of the impedance of a series R-L-C circuit at resonance?
1. High, as compared to the circuit resistance.
2. Approximately equal to the circuit resistance.
3. Approximately equal to XL.
4. Approximately equal to XC.
(E3D9) What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance?
1. Approximately equal to the circuit resistance.
2. Approximately equal to XL.
3. Low, as compared to the circuit resistance.
4. Approximately equal to XC.
(E3D10) What is the characteristic of the current flow in a series R-L-C circuit at resonance?
1. It is at a minimum.
2. It is at a maximum.
3. It is DC.
4. It is zero.
(E3D11) What is the characteristic of the current flow in a parallel R-L-C circuit at resonance?
1. The current circulating in the parallel elements is at a minimum.
2. The current circulating in the parallel elements is at maximum.
3. The current circulating in the parallel elements is DC.
4. The current circulating in the parallel elements is zero.
(E3D12) What is the skin effect?
1. The phenomenon where RF current flows in a thinner layer of the conductor, close to the surface, as frequency increases.
2. The phenomenon where RF current flows in a thinner layer of the conductor, close to the surface, as frequency decreases.
3. The phenomenon where thermal effects on the surface of the conductor increase the impedance.
4. The phenomenon where thermal effects on the surface of the conductor decrease the impedance.
(E3D13) What is the term for the phenomenon where most of an RF current flows along the surface of the conductor?
1. Layer effect.
2. Seeburg Effect.
3. Skin effect.
4. Resonance.
(E3D14) Where does practically all of the RF current flow in a conductor?
1. Along the surface.
2. In the center of the conductor.
3. In the magnetic field around the conductor.
4. In the electromagnetic field in the conductor center.
(E3D15) Why does practically all of an RF current flow within a few thousandths-of-an-inch of the conductor's surface?
1. Because of skin effect.
2. Because the RF resistance of the conductor is much less than the DC resistance.
3. Because of heating of the metal at the conductor's interior.
4. Because of the AC-resistance of the conductor's self inductance.
(E3D16) Why is the resistance of a conductor different for RF current than for DC?
1. Because the insulation conducts current at radio frequencies.
2. Because of the Heisenburg Effect.
3. Because of skin effect.
4. Because conductors are non-linear devices.
(E3D17) What is a magnetic field?
1. Current flow through space around a permanent magnet.
2. A force set up when current flows through a conductor.
3. The force between the plates of a charged capacitor.
4. The force that drives current through a resistor.
(E3D18) In what direction is the magnetic field about a conductor when current is flowing?
1. In the same direction as the current.
2. In a direction opposite to the current flow.
3. In all directions; omnidirectional.
4. In a direction determined by the left hand rule.
(E3D19) What device is used to store electrical energy in an electrostatic field?
1. A battery.
2. A transformer.
3. A capacitor.
4. An inductor.
(E3D20) What is the term used to express the amount of electrical energy stored in an electrostatic field?
1. Coulombs.
2. Joules.
3. Watts.
4. Volts.
(E3D21) What factors determine the capacitance of a capacitor?
1. Area of the plates, voltage on the plates and distance between the plates.
2. Area of the plates, distance between the plates and the dielectric constant of the material between the plates.
3. Area of the plates, voltage on the plates and the dielectric constant of the material between the plates.
4. Area of the plates, amount of charge on the plates and the dielectric constant of the material between the plates.
(E3D22) What is the dielectric constant for air?
1. Approximately 1.
2. Approximately 2.
3. Approximately 4.
4. Approximately 0.
(E3D23) What determines the strength of the magnetic field around a conductor?
1. The resistance divided by the current.
2. The ratio of the current to the resistance.
3. The diameter of the conductor.
4. The amount of current.
(E3D24) Why would the rate at which electrical energy is used in a circuit be less than the product of the magnitudes of the AC voltage and current?
1. Because there is a phase angle that is greater than zero between the current and voltage.
2. Because there are only resistances in the circuit.
3. Because there are no reactances in the circuit
4. Because there is a phase angle that is equal to zero between the current and voltage.
(E3D25) In a circuit where the AC voltage and current are out of phase, how can the true power be determined?
1. By multiplying the apparent power times the power factor.
2. By subtracting the apparent power from the power factor.
3. By dividing the apparent power by the power factor.
4. By multiplying the RMS voltage times the RMS current.
(E3D26) What does the power factor equal in an R-L circuit having a 60 degree phase angle between the voltage and the current?
1. 1.414.
2. 0.866.
3. 0.5.
4. 1.73.
(E3D27) What does the power factor equal in an R-L circuit having a 45 degree phase angle between the voltage and the current?
1. 0.866.
2. 1.0.
3. 0.5.
4. 0.707.
(E3D28) What does the power factor equal in an R-L circuit having a 30 degree phase angle between the voltage and the current?
1. 1.73.
2. 0.5.
3. 0.866.
4. 0.577.
(E3D29) How many watts are being consumed in a circuit having a power factor of 0.2 when the input is 100-V AC and 4-amperes is being drawn?
1. 400 watts.
2. 80 watts.
3. 2000 watts.
4. 50 watts.
(E3D30) How many watts are being consumed in a circuit having a power factor of 0.6 when the input is 200-V AC and 5-amperes is being drawn?
1. 200 watts.
2. 1000 watts.
3. 1600 watts.
4. 600 watts.
(E3D31) What is the effective radiated power of a repeater with 50 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain?
1. 158 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 39.7 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 251 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 69.9 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D32) What is the effective radiated power of a repeater with 50 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 7 dB antenna gain?
1. 300 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 315 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 31.5 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 69.9 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D33) What is the effective radiated power of a repeater with 75 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 10 dB antenna gain?
1. 600 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 75 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 18.75 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 150 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D34) What is the effective radiated power of a repeater with 75 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain?
1. 37.6 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 237 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 150 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 23.7 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D35) What is the effective radiated power of a repeater with 100 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 7 dB antenna gain?
1. 631 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 400 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 25 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 100 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D36) What is the effective radiated power of a repeater with 100 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain?
1. 800 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 126 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 12.5 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 1260 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D37) What is the effective radiated power of a repeater with 120 watts transmitter power output, 5 dB feedline loss, 4 dB duplexer and circulator loss, and 6 dB antenna gain?
1. 601 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 240 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 60 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 379 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D38) What is the effective radiated power of a repeater with 150 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 7 dB antenna gain?
1. 946 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 37.5 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 600 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 150 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D39) What is the effective radiated power of a repeater with 200 watts transmitter power output, 4 dB feedline loss, 4 dB duplexer and circulator loss, and 10 dB antenna gain?
1. 317 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 2000 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 126 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 260 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D40) What is the effective radiated power of a repeater with 200 watts transmitter power output, 4 dB feedline loss, 3 dB duplexer and circulator loss, and 6 dB antenna gain?
1. 252 watts, assuming the antenna gain is referenced to a half-wave dipole.
2. 63.2 watts, assuming the antenna gain is referenced to a half-wave dipole.
3. 632 watts, assuming the antenna gain is referenced to a half-wave dipole.
4. 159 watts, assuming the antenna gain is referenced to a half-wave dipole.
(E3D41) What is the photoconductive effect?
1. The conversion of photon energy to electromotive energy.
2. The increased conductivity of an illuminated semiconductor junction.
3. The conversion of electromotive energy to photon energy.
4. The decreased conductivity of an illuminated semiconductor junction.
(E3D42) What happens to photoconductive material when light shines on it?
1. The conductivity of the material increases.
2. The conductivity of the material decreases.
3. The conductivity of the material stays the same.
4. The conductivity of the material becomes temperature dependent.
(E3D43) What happens to the resistance of a photoconductive material when light shines on it?
1. It increases.
2. It becomes temperature dependent.
3. It stays the same.
4. It decreases.
(E3D44) What happens to the conductivity of a semiconductor junction when it is illuminated?
1. It stays the same.
2. It becomes temperature dependent.
3. It increases.
4. It decreases.
(E3D45) What is an optocoupler?
1. A resistor and a capacitor.
2. A frequency modulated helium-neon laser.
3. An amplitude modulated helium-neon laser.
4. An LED and a phototransistor.
(E3D46) What is an optoisolator?
1. An LED and a phototransistor.
2. A P-N junction that develops an excess positive charge when exposed to light.
3. An LED and a capacitor.
4. An LED and a solar cell.
(E3D47) What is an optical shaft encoder?
1. An array of optocouplers chopped by a stationary wheel.
2. An array of optocouplers whose light transmission path is controlled by a rotating wheel.
3. An array of optocouplers whose propagation velocity is controlled by a stationary wheel.
4. An array of optocouplers whose propagation velocity is controlled by a rotating wheel.
(E3D48) What does the photoconductive effect in crystalline solids produce a noticeable change in?
1. The capacitance of the solid.
2. The inductance of the solid.
3. The specific gravity of the solid.
4. The resistance of the solid.
(E3D49) What is the meaning of the term time constant of an RC circuit?
1. The time required to charge the capacitor in the circuit to 36.8% of the supply voltage.
2. The time required to charge the capacitor in the circuit to 36.8% of the supply current.
3. The time required to charge the capacitor in the circuit to 63.2% of the supply current.
4. The time required to charge the capacitor in the circuit to 63.2% of the supply voltage.
(E3D50) What is the meaning of the term time constant of an RL circuit?
1. The time required for the current in the circuit to build up to 36.8% of the maximum value.
2. The time required for the voltage in the circuit to build up to 63.2% of the maximum value.
3. The time required for the current in the circuit to build up to 63.2% of the maximum value.
4. The time required for the voltage in the circuit to build up to 36.8% of the maximum value.
(E3D51) What is the term for the time required for the capacitor in an RC circuit to be charged to 63.2% of the supply voltage?
1. An exponential rate of one.
2. One time constant.
3. One exponential period.
4. A time factor of one.
(E3D52) What is the term for the time required for the current in an RL circuit to build up to 63.2% of the maximum value?
1. One time constant.
2. An exponential period of one.
3. A time factor of one.
4. One exponential rate.
(E3D53) What is the term for the time it takes for a charged capacitor in an RC circuit to discharge to 36.8% of its initial value of stored charge?
1. One discharge period.
2. An exponential discharge rate of one.
3. A discharge factor of one.
4. One time constant.
(E3D54) What is meant by back EMF?
1. A current equal to the applied EMF.
2. An opposing EMF equal to R times C (RC) percent of the applied EMF.
3. A current that opposes the applied EMF.
4. A voltage that opposes the applied EMF.
(E3D55) After two time constants, the capacitor in an RC circuit is charged to what percentage of the supply voltage?
1. 36.8%.
2. 63.2%.
3. 86.5%.
4. 95%.
(E3D56) After two time constants, the capacitor in an RC circuit is discharged to what percentage of the starting voltage?
1. 86.5%.
2. 63.2%.
3. 36.8%.
4. 13.5%.
(E3D57) What is the time constant of a circuit having a 100-microfarad capacitor and a 470-kilohm resistor in series?
1. 4700 seconds.
2. 470 seconds.
3. 47 seconds.
4. 0.47 seconds.
(E3D58) What is the time constant of a circuit having a 220-microfarad capacitor and a 1-megohm resistor in parallel?
1. 220 seconds.
2. 22 seconds.
3. 2.2 seconds.
4. 0.22 seconds.
(E3D59) What is the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm resistors all in series?
1. 470 seconds.
2. 47 seconds.
3. 4.7 seconds.
4. 0.47 seconds.
(E3D60) What is the time constant of a circuit having two 100-microfarad capacitors and two 470-kilohm resistors all in parallel?
1. 470 seconds.
2. 47 seconds.
3. 4.7 seconds.
4. 0.47 seconds.
(E3D61) What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in series?
1. 55 seconds.
2. 110 seconds.
3. 220 seconds.
4. 440 seconds.
(E3D62) What is the time constant of a circuit having two 220-microfarad capacitors and two 1-megohm resistors all in parallel?
1. 22 seconds.
2. 44 seconds.
3. 220 seconds.
4. 440 seconds.
(E3D63) What is the time constant of a circuit having one 100-microfarad capacitor, one 220-microfarad capacitor, one 470-kilohm resistor and one 1-megohm resistor all in series?
1. 68.8 seconds.
2. 101.1 seconds.
3. 220.0 seconds.
4. 470.0 seconds.
(E3D64) What is the time constant of a circuit having a 470-microfarad capacitor and a 1-megohm resistor in parallel?
1. 0.47 seconds.
2. 47 seconds.
3. 220 seconds.
4. 470 seconds.
(E3D65) What is the time constant of a circuit having a 470-microfarad capacitor and a 470-kilohm resistor in series?
1. 221 seconds.
2. 221,000 seconds.
3. 470 seconds.
4. 470,000 seconds.
(E3D66) What is the time constant of a circuit having a 220-microfarad capacitor and a 470-kilohm resistor in series?
1. 103 seconds.
2. 220 seconds.
3. 470 seconds.
4. 470,000 seconds.
(E3D67) How long does it take for an initial charge of 20 V DC to decrease to 7.36 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
1. 12.64 seconds.
2. 0.02 seconds.
3. 1 second.
4. 7.98 seconds.
(E3D68) How long does it take for an initial charge of 20 V DC to decrease to 2.71 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
1. 0.04 seconds.
2. 0.02 seconds.
3. 7.36 seconds.
4. 12.64 seconds.
(E3D69) How long does it take for an initial charge of 20 V DC to decrease to 1 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
1. 0.01 seconds.
2. 0.02 seconds.
3. 0.04 seconds.
4. 0.06 seconds.
(E3D70) How long does it take for an initial charge of 20 V DC to decrease to 0.37 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
1. 0.08 seconds.
2. 0.6 seconds.
3. 0.4 seconds.
4. 0.2 seconds.
(E3D71) How long does it take for an initial charge of 20 VDC to decrease to 0.13 V DC in a 0.01-microfarad capacitor when a 2-megohm resistor is connected across it?
1. 0.06 seconds.
2. 0.08 seconds.
3. 0.1 seconds.
4. 1.2 seconds.
(E3D72) How long does it take for an initial charge of 800 V DC to decrease to 294 VDC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
1. 80 seconds.
2. 294 seconds.
3. 368 seconds.
4. 450 seconds.
(E3D73) How long does it take for an initial charge of 800 V DC to decrease to 108 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
1. 225 seconds.
2. 294 seconds.
3. 450 seconds.
4. 900 seconds.
(E3D74) How long does it take for an initial charge of 800 V DC to decrease to 39.9 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
1. 1,350 seconds.
2. 900 seconds.
3. 450 seconds.
4. 225 seconds.
(E3D75) How long does it take for an initial charge of 800 VDC to decrease to 40.2 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
1. Approximately 225 seconds.
2. Approximately 450 seconds.
3. Approximately 900 seconds.
4. Approximately 1,350 seconds.
(E3D76) How long does it take for an initial charge of 800 V DC to decrease to 14.8 V DC in a 450-microfarad capacitor when a 1-megohm resistor is connected across it?
1. Approximately 900 seconds.
2. Approximately 1,350 seconds.
3. Approximately 1,804 seconds.
4. Approximately 2,000 seconds.
(E3D77) What is the impedance of a network composed of a 0.1-microhenry inductor in series with a 20-ohm resistor, at 30 MHz? (Specify your answer in rectangular coordinates.)
1. 20+J19.
2. 20-J19.
3. 19 + J20.
4. 19-J20.
(E3D78) What is the impedance of a network composed of a 0.1-microhenry inductor in series with a 30-ohm resistor, at 5 MHz? (Specify your answer in rectangular coordinates.)
1. 30-j3.
2. 30 + J3.
3. 3 + J30.
4. 3-J30.
(E3D79) What is the impedance of a network composed of a 10-microhenry inductor in series with a 40-ohm resistor, at 500 MHz? (Specify your answer in rectangular coordinates.)
1. 40+J31400.
2. 40-J31400.
3. 31400 + J40.
4. 31400-J40.
(E3D80) What is the impedance of a network composed of a 0.001-microfarad capacitor in series with a 400-ohm resistor, at 500 kHz? (Specify your answer in rectangular coordinates.)
1. 400-J318.
2. 318-J400.
3. 400+J318.
4. 318+J400.
(E3D81) What is the impedance of a network composed of a 100-picofarad capacitor in parallel with a 4000-ohm resistor, at 500 kHz? (Specify your answer in polar coordinates.)
1. 2490 ohms, / 51.5 degrees.
2. 4000 ohms, / 38.5 degrees.
3. 5112 ohms, / -38.5 degrees.
4. 2490 ohms, / -51.5 degrees.
(E3D82) What is the impedance of a network composed of a 100-ohm-reactance inductor in series with a 100-ohm resistor? (Specify your answer in polar coordinates.)
1. 121 ohms, / 35 degrees.
2. 141 ohms, / 45 degrees.
3. 161 ohms, / 55 degrees.
4. 181 ohms, / 65 degrees.
(E3D83) A nickel-cadmium cell has an operating voltage of about:
1. 1.25 volts.
2. 1.4 volts.
3. 1.5 volts.
4. 2.1 volts.
(E3D84) What is the impedance of a network composed of a 400-ohm-reactance capacitor in series with a 300-ohm resistor? (Specify your answer in polar coordinates.)
1. 240 ohms, / 36.9 degrees.
2. 240 ohms, / -36.9 degrees.
3. 500 ohms, / 53.1 degrees.
4. 500 ohms, / -53.1 degrees.
(E3D85) What is the impedance of a network composed of a 300-ohm-reactance capacitor, a 600-ohm-reactance inductor, and a 400-ohm resistor, all connected in series? (Specify your answer in polar coordinates.)
1. 500 ohms, / 37 degrees.
2. 400 ohms, / 27 degrees.
3. 300 ohms, / 17 degrees.
4. 200 ohms, / 10 degrees.
(E3D86) What is the impedance of a network composed of a 400-ohm-reactance inductor in parallel with a 300-ohm resistor? (Specify your answer in polar coordinates.)
1. 240 ohms, / 36.9 degrees.
2. 240 ohms, / -36.9 degrees.
3. 500 ohms, / 53.1 degrees.
4. 500 ohms, / -53.1 degrees.
(E3D87) What is the impedance of a network composed of a 1.0-millihenry inductor in series with a 200-ohm resistor, at 30 kHz? (Specify your answer in rectangular coordinates.)
1. 200-J188.
2. 200+j188.
3. 188+J200.
4. 188-J200.
(E3D88) What is the impedance of a network composed of a 0.01-microfarad capacitor in parallel with a 300-ohm resistor, at 50 kHz? (Specify your answer in rectangular coordinates.)
1. 150-J159.
2. 150+J159.
3. 159+J150.
4. 159-J150.
(E3D89) Which of the following components is used in a power supply circuit to allow filter capacitors to discharge when power is turned off and aids in holding the voltage output more constant?
1. Bleeder resistor.
2. Multiplier resistor.
3. Surge resistor.
4. Rectifying diodes.
(E3D90) A 1 watt, 10 volt zener diode with the following characteristics: 1 min. = 5 mA, I max. = 95 mA, and Z = 8 ohms ; is to be used as part of a voltage regulator. Approximately what size current limiting resistor would set it's bias to the midpoint of it's operating range?
1. 100 ohms.
2. 200 ohms.
3. 1 kilohms.
4. 2 kilohms.
(E3D91) A 1 watt, 10 volt zener diode with the following characteristics: 1 min. = 5 mA, 1 max. = 480 mA, and Z = 3 ohms; is to be used as part of a voltage regulator. Approximately what size current limiting resistor would set it's bias to the midpoint of it's operating range?
1. 40 ohms.
2. 100 ohms.
3. 400 ohms.
4. 1 kilohms.
(E3D92) A crowbar circuit is often added to a power supply to:
1. Prevent the circuit protective devices from being damaged.
2. Aide the filter section by increasing voltage regulation.
3. Protect the power supply by allowing the load to have as much current as it needs.
4. Protect the load by activating circuit protective devices.
(E3D93) Given a power supply with a no load voltage of 12 volts and a full load voltage of 10 volts, what is the percentage of voltage regulation?
1. 17%.
2. 20%.
3. 80%.
4. 83%.
(E3D94) Given a power supply with a full load voltage of 200 volts and a regulation of 25%, what is the no load voltage?.
1. 150 volts.
2. 160 volts.
3. 240 volts.
4. 250 volts.
(E3D95) Given a power supply with a no load voltage of 200 volts and a regulation of 25 %, what is the full load voltage.
1. 150 volts.
2. 160 volts.
3. 240 volts.
4. 250 volts.
(E3D96) A 50 microampere meter movement has an internal resistance of 2 kilohms. What applied voltage is required to indicate half-scale deflection?
1. 0.01 Volts.
2. 0.10 Volts.
3. 0.005 Volts.
4. 0.05 Volts.
(E3D97) The expression Voltage regulation' as it applies to a shunt-wound DC generator operating at a constant frequency refers to:
1. Voltage output efficiency.
2. Voltage in the secondary compared to the primary.
3. Voltage fluctuations from load to no-load.
4. Rotor winding voltage ratio.
(E3D98) When an emergency transmitter uses 325 watts and a receiver uses 50 watts, how many hours can a 12.6 volt, 55 ampere-hour battery supply full power to both units?
1. 6 hours.
2. 3 hours.
3. 1.8 hours.
4. 1.2 hours.
(E3D99) The expression "voltage regulation" as it applies to a generator operating at a constant frequency refers to:
1. Full load to no load.
2. Limited load to peak load.
3. Source input supply frequency.
4. Field frequency.
(E3D100) The output of a separately excited AC generator running at a constant speed can be controlled by:
1. Armature.
2. Brushes.
3. Field current.
4. Exciter.
(E3D101) A transformer used to step up its input voltage must have:
1. More turns of wire on its primary than on its secondary.
2. More turns of wire on its secondary than on its primary.
3. Equal number of primary and secondary turns of wire.
4. None of the above statements are correct.
(E3D102) A transformer used to step down its input voltage must have:
1. More turns of wire on its primary than on its secondary.
2. More turns of wire on its secondary than on its primary.
3. Equal number of primary and secondary turns of wire.
4. None of the above statements are correct.
(E3D103) A 12.6 volt, 8 ampere-hour battery is supplying power to a receiver that uses 50 watts and a radar system that uses 300 watts. How long will the battery last?
1. 100.8 hours.
2. 27.7 hours.
3. 1 hour.
4. 17 minutes or 0.3 hours.
(E3D104) What is the total voltage when 12 Nickel-Cadmium batteries are connected in series?
1. 12 volts.
2. 12.6 volts.
3. 15 volts.
4. 72 volts.
(E3D105) A ship radar unit uses 315 watts and a radio uses 50 watts. If the equipment is connected to a 50 ampere-hour battery rated at 12.6 volts, how long will the battery last?
1. 28.97 hours.
2. 29 minutes.
3. 1 hour 43 minutes.
4. 10 hours 50 minutes.
(E3D106) The turns ratio of a transformer is 1 : 20. When a 120 volt ac source is connected to its primary winding, the secondary voltage is:
1. 120 Volts.
2. 1200 Volts.
3. 600 Volts.
4. 2400 Volts.
(E3D107) There is an improper impedance match between a 30 watt transmitter and the antenna and 5 watts is reflected. How much power is actually radiated?
1. 35 watts.
2. 30 watts.
3. 25 watts.
4. 20 watts.
(E3D108) How long will a 12.6 volt, 50 ampere-hour battery last if it supplies power to an emergency transmitter rated at 531 watts of plate input power and other emergency equipment with a combined power rating of 530 watts?
1. 6 hours.
2. 4 hours.
3. 1 hour.
4. 35 minutes.
(E3D109) A 12.6 volt, 55 ampere-hour battery is connected to a radar unit rated at 325 watts and a receiver that uses 20 watts. How long will radar unit and receiver be able to draw full power from the battery?
1. 6 hours.
2. 4 hours.
3. 2.3 hours.
4. 2 hours.
(E3D110 A power transformer has a 120 volt primary winding and a 24 volt secondary winding. What is its turns ratio?
1. 10 :1.
2. 1 :10.
3. 5 : 1.
4. 1 : 5.
(E3D111) A 6 volt battery with 1.2 ohms internal resistance is connected across two 3 watt bulbs. What is the current flow?
1. .57 amps.
2. .83 amps.
3. 1.0 amps.
4. 6.0 amps.
(E3D112) A power transformer has a primary winding of 200 turns of #24 wire and a secondary winding consisting of 500 turns of the same size wire. When 20 volts is applied to the primary winding, the expected secondary voltage is:
1. 500 Volts.
2. 25 Volts.
3. 10 Volts.
4. 50 Volts.
(E3D113) The power input to a 52 ohm transmission line is 1,872 watts. The current flowing through the line is:
1. 6 amps.
2. 144 amps.
3. 0.06 amps.
4. 28.7 amps.
(E3D114) If a marine radiotelephone receiver uses 75 watts of power and a transmitter uses 325 watts, how long can they both operate before discharging a 50 ampere-hour 12 volt battery?
1. 40 minutes.
2. 1 hour.
3. 1 1/2 hours.
4. 6 hours.
(E3D115) A power transformer has a single primary winding and three secondary windings producing 5.0 volts, 12.6 volts, and 150 volts. Which of the three secondary windings will have the highest measured DC resistance.
1. The 12.6 volt winding.
2. The 5.0 volt winding.
3. The 150 volt winding.
4. All will have equal resistance values.
(E3D116) Which of the following list is correct for listing common materials in order of descending conductivity:
1. Silver, copper, aluminum, iron, and lead.
2. Lead, iron, silver, aluminum, and copper.
3. Iron, silver, aluminum, copper, and silver.
4. Silver, aluminum, iron, lead, and copper.
(E3D117) Under what condition may gas be a good conductor?
1. When placed in an isotropic radiator.
2. When subjected to a vacuum.
3. When ionized.
4. When placed in a Leclanche' cell.
(E3D118) Ship's power is generated 3-phase, ungrounded. On a delta-wound transformer with 120 Vac line-to-line secondary, the voltmeter reading from line to ground is:
1. Approximately 67 Vac for a normal balanced system with no faults.
2. 0 Vac for a system with that phase faulted to ground.
3. 120 Vac when another phase is faulted to ground.
4. None of these.
(E3D119) The product of the number of turns and the current in amperes used to describe relative magnitude is:
1. Ampere turns.
2. Joules per second.
3. Push-pull convergence.
4. Dissipation collection.
(E3D120) The factor by which the product of volts and amperes must be multiplied to obtain true power is:
1. Apparent power.
2. Power factor.
3. Phase angle.
4. Power angle.
(E3D121) Halving the cross-sectional area of a conductor will:
1. Not affect the resistance.
2. Quarter the resistance.
3. Half the resistance.
4. Double the resistance.
(E3D122 If a resistance to which a constant voltage is applied is halved, what power dissipation will result?
1. Doubled.
2. Halved.
3. Quadrupled.
4. Stay the same.
(E3D123) The effective value of an RF current and the heating value of the current are:
1. Effective value divided by two equals the heating value.
2. Effective value multiplied by two equals the heating value.
3. The sum of the value of the divided parts multiplied by two equals.
4. The same.
(E3D124) 746 watts, roughly 3/4 kilowatt corresponding to the lifting of 550 pounds at the rate of one foot per second is:
1. Quarter of a horsepower.
2. Half of a horsepower.
3. 3/4 of a horsepower.
4. One horsepower.
(E3D125) Assuming a power source to have a fixed value of internal impedance, maximum power will be transferred to the load when:
1. The load impedance equals the internal impedance of the source.
2. The load impedance is greater than the source impedance.
3. The load impedance is less than the source impedance.
4. The fixed values of internal impedance is not relative to the power source.
(E3D126) What is the conductance (G) of a circuit if 6 amperes of current flows when 12 Vdc is applied?
1. 0.25 siemens(mho).
2. 0.50 siemens(mho).
3. 1.00 siemens(mho).
4. 1.25 siemens(mho).
(E3D127) If the voltage to a circuit is doubled and the resistance is tripled, what will be the final current?
1. 1/3 the original current.
2. 2/3 the original current.
3. 1 1/3 the original current.
4. Double the original current.
(E3D128) A relay coil has 500 ohms resistance, and operates on 125 mA. What value of resistance should be connected in series with it to operate from 110 Vdc?
1. 150 ohms.
2. 220 ohms.
3. 380 ohms.
4. 470 ohms.
(E3D129) How many capacitors of 400 volts and microfarads each would be necessary to obtain a combination rated at 1600 volts and 1.5 microfarads?
1. 10
2. 12
3. 14
4. 16
(E3D130) The total inductance of two coils in parallel without any mutual coupling is:
1. Equal to the product of the two inductances divided by their sum.
2. Equal to the sum of the individual inductances.
3. Equal to zero.
4. Equal to the sum of the individual inductances divided by their product.
(E3D131) Permeability is:
1. The magnetic field created by a conductor wound on a laminated core and carrying current.
2. The ratio of magnetic flux density in a substance to the magnetizing force that produces it.
3. Polarized molecular alignment in a ferromagnetic material while under the influence of a magnetizing force.
4. None of these.
(E3D132) What is the total impedance of a series AC circuit having a resistance of 6 ohms, an inductive reactance of 17 ohms, and zero capacitive reactance?
1. 6.6 ohms.
2. 11 ohms.
3. 18 ohms.
4. 23 ohms.
(E3D133) The opposition to the creation of magnetic lines offeree in a magnetic circuit is known as:
1. Eddy currents.
2. Hysterisis.
3. Permeability.
4. Reluctance.
(E3D134) Why is a center tap usually provided for vacuum tube plate and grid return circuits when an AC filament supply is used?
1. To prevent hum voltage from modulating the normal signals.
2. To allow more filament current.
3. All of these.
4. None of these.
(E3D135) Given the following vacuum tube constants: Gp = 1000V, Ip = 150 mA, Ig = 10 mA, and Grid leaks = 5000 ohms; What would be the grid bias voltage?
1. 25V.
2. 50V.
3. 100 V.
4. None of these.
(E3D136) A special type of power supply filter choke whose inductance is inversely proportional to the amount of current flowing through it is a:
1. AF choke.
2. RF choke.
3. Smoothing choke.
4. Swinging choke.
(E3D137) What turn ratio does a transformer need to match a source impedance of 500 ohms to a load of 10 ohms.
1. 7.1 to 1.
2. 14.2 to 1.
3. 50 to l.
4. None of these.
(E3D138) What is the DC plate voltage of a resistance-coupled amplifier stage with a plate-supply voltage of 260 V, a plate current of 1 mA, and a plate load resistance of 100 kilohms.
1. 60 volts.
2. 100 volts.
3. 160 volts.
4. 220 volts.
(E3D139) The average fully charged voltage of an Edison storage cell is:
1. 1 volt.
2. 1.2 volts.
3. 1.5 volts.
4. 2 volts.
(E3D140) The average fully charged voltage of a lead-acid storage cell is:
1. 1 volt.
2. 1.2 volts.
3. 1.56 volts.
4. 2.06 volts.
(E3D141) A battery with a terminal voltage of 12.5 volts is to be trickle-charged at a 0.5 A rate. What resistance should be connected in series with the battery to charge it from a 110 Vdc line?
1. 95 ohms.
2. 195 ohms.
3. 300 ohms.
4. None of these.
(E3D142) A discharged storage cell of 3 cells has an open-circuit voltage of 1.8 volts per cell and an internal resistance of 0.1 ohms per cell. What voltage is needed to give an initial charging rate of 10 A?
1. 8.4 volts.
2. 10 volts.
3. 12.5 volts.
4. 15 volts.
(E3D143) What capacity in amperes does a storage battery need to be in order to operate a 50 watt transmitter for 6 hours? Assume a continuous transmitter load of 70% of the key-locked demand of 40 A, and an emergency light load of 1.5 A?
1. 100 ampere-hours.
2. 177 ampere-hours.
3. 249 ampere-hours.
4. None of these.
(E3D144) What current will flow in a 6 volt storage battery with an internal resistance of 0.01 ohms, when a 3 watt, 6 volt lamp is connected?
1. 0.4885 amps.
2. 0.4995 amps.
3. 0.5566 amps.
4. 0.5795 amps.
(E3D145) What is the ratio of the output frequency to the input frequency of a single-phase full-wave rectifier?
1. 1 :1.
2. 1:2.
3. 2:1.
4. None of these.
(E3D146) A capacitor is sometimes placed in series with the primary of a power transformer to:
1. Improve the power factor.
2. Improve output voltage regulation.
3. To rectify the primary windings.
4. None of these.
(E3D147) What is the maximum allowable secondary voltage of a center-tapped transformer used in a full-wave rectifier with tubes having a peak inverse voltage rating of 10,000 volts?
1. 5,000 volts.
2. 7,070 volts.
3. 10,000 volts.
4. 14,140 volts.
(E3D148) A 3 horsepower, 100 Vdc motor is 85% efficient when developing its rated output. What is the current?
1. 8.545 amps.
2. 20.345 amps.
3. 26.3 amps.
4. 25 amps.
(E3D149) What is the line current of a 7 horsepower motor operating on 120 volts at full load, a power factor of 0.8, and 95% efficient?
1. 4.72 amps.
2. 13.03 amps.
3. 56 amps.
4. 57.2 amps.
(E3D150) The second harmonic of a 380 kHz frequency is:
1. 2.
2. 190 kHz.
3. 760kHz.
4. 144.4 GHz.
(E3D151) In a self-biased RF amplifier stage: plate voltage = 1250 volts, plate current =150 mA, grid current =15 mA, and grid-leak resistance = 4000 ohms. What is the operating grid bias voltage?
1. 30 volts.
2. 60 volts.
3. 187.5 volts.
4. 540 volts.
(E3D152) What would be the dB change in field intensity at a given distance if the transmitter output power is doubled?
1. 1.5 dB.
2. 6 dB.
3. 2 dB.
4. 3 dB.
(E3D153) If a field strength is 100 microvolts per meter at 100 miles, what is the field strength at 200 miles?
1. 10 microvolts.
2. 25 microvolts.
3. 50 microvolts.
4. 150 microvolts
(E3D154) What is the purpose of a multiplier resistor used with a voltmeter?
1. A multiplier resistor is not used with a voltmeter.
2. It is used to increase the voltage indicating range of the voltmeter.
3. It is used to decrease the voltage indicating range of the voltmeter.
4. It is used to increase the current indicating range of an ammeter not a voltmeter.
(E3D155) What is the purpose of a shunt resistor used with an ammeter?
1. A shunt resistor is not used with an ammeter.
2. It is used to increase the ampere indicating range of the ammeter.
3. It is used to decrease the ampere indicating range of the ammeter.
4. It is used to increase the voltage indicating range of the voltmeter not the ammeter.
(E3D156) The product of the readings of an ac voltmeter and ac ammeter is called:
1. Apparent power.
2. True power.
3. Power factor.
4. Current power.
(E3D157) An ac ammeter indicates:
1. Effective (TRM) values of current.
2. Effective (RMS) values of current.
3. Peak values of current.
4. Average values of current.
(E3D158) How may the range of a thermocouple ammeter be increased?
1. By using a current transformer.
2. By using a capacitor shunt.
3. By using a current transformer and a capacitor shunt.
4. By using a resistor shunt.
(E3D159) By what factor must the voltage of an ac circuit, as indicated on the scale of an ac voltmeter, be multiplied to obtain the average voltage value?
1. 0.707.
2. 0.9.
3. 1.414.
4. 3.14.
(E3D160) By what factor must the voltage of an ac circuit, as indicated on the scale of an ac voltmeter, be multiplied to obtain the peak voltage value?
1. 0.707.
2. 0.9.
3. 1.414.
4. 3.14.
(E3D161) What is the energy consumed by a radio receiver drawing 50 watts of power for 10 hours?
1. 500 joules.
2. 30000 joules.
3. 1800000 joules.
4. 30000 Ws.
(E3D162) What is the maximum rated current-carrying capacity of a resistor marked "2000 ohms, 200 watts"?
1. .316 amps.
2. 3.16 amps.
3. 10 amps.
4. 100 amps.
(E3D163) A radio receiver rated at 50 watts draws 1.5 amps from the line. The effective resistance is:
1. 8.66 ohms.
2. 22.2 ohms.
3. 33.3 ohms.
4. 1.11 kilohms.
(E3D164) What is the maximum voltage that may be connected across a 20 watt, 2000 ohm resistor?
1. 10 volts.
2. 100 volts.
3. 200 volts.
4. 10,000 volts.
(E3D165) What is the resistance of a 60 watt, 117 volt lamp?
1. 1.95 ohms.
2. 2.76 ohms.
3. 30.8 ohms.
4. 228 ohms.
(E3D166) How much energy is used in a week by a 117 volt clock having an internal resistance of 5000 ohms?
1. 19.2 watt-hours.
2. 134 watt-hours.
3. 460 watt-hours.
4. 27.6 kilowatt-hours.
(E3D167) If .8 coulombs pass a point in a circuit in. 8 seconds, what is the average current value?
1. 1 ampere.
2. .640 amperes.
3. 1.28 amperes.
4. .414 amperes.
(E3D168) How much power is developed when 117 volts forces 11.7 coulombs through a point in a circuit in 1.17 seconds?
1. 8.55 watts.
2. 11.7 watts.
3. 1.17k watts.
4. 1.6 kilowatts.
(E3D169) A 20 ohm, a 30 ohm, and an unknown-value resistor are connected in series across a 140 volt source with.5 amps flowing through the circuit. What is the unknown resistor's size?
1. 40 ohms
2. 90 ohms.
3. 115 ohms.
4. 230 ohms.
(E3D170) A 12 volt automotive battery with an internal resistance of. 2 ohms is connected to a 2 ohm headlight lamp. What is the amount of current passing through the lamp?
1. 1.2 amperes.
2. 5.45 amperes.
3. 6 amperes.
4. None of these.
(E3D171) What is the conductance of circuit having three 300 ohm and two 200 ohm resistors connected in parallel?
1. 20 mS.
2. 50 ohms.
3. 8.33 mS.
4. 120 ohms.
(E3D172) A 500 ohm, 2 watt resistor and a 1500 ohm, 1 watt resistor are connected in parallel. What is the maximum voltage that can be applied across the parallel circuit without exceeding wattage ratings?
1. 22.4 volts.
2. 31.6 volts.
3. 38.7 volts.
4. 875 volts.
(E3D173) A 20 ohm and 30 ohm resistor form a parallel circuit connected to a 12 volt source with an internal resistance of.2 ohms. Which of the following correctly represents Kirchoffs voltage laws for the circuit in question?
1. 12 - .2A - 20A - 30B = 0.
2. 12 - .2A – 20B = 0.
3. 12 - .2A – 30A = 0.
4. 12 - .2C – 20B = 0 and 12 - .2C – 30A = 0.
9E3D174) If a complex circuit is reduced to an equivalent circuit consisting of a single voltage source in series with a single resistor, this is an example of:
1. Norton's theorem.
2. Thevenin's theorem.
3. Ohm's law.
4. Kirchoffs law.
(E3D175) If a complex circuit is reduced to an equivalent circuit consisting of a single current source in parallel with a single resistor, this is an example of:
1. Norton's theorem.
2. Thevenin's theorem.
3. Ohm's law.
4. Kirchoffs law.
(E3D176) If a 20 ohm resistor, a 30 ohm resistor, and a 12 volt source with an internal resistance of 2 ohms are connected in a parallel circuit arrangement, how much current will flow from the source?
1. 0.240 amperes.
2. 0.857 amperes.
3. 0.750 amperes.
4. 1.000 amperes.
(E3D177) If a current flowing through a coil produces 200 lines of force in the core of the coil it can be said that the core has:
1. Flux of 14.14 lines.
2. Flux of 100 lines.
3. 200 gauss.
4. 200 maxwells.
(E3D178) If the core of a coil is 2 centimeters squared and has 200 lines of force in the core, it can be said that the core has:
1. Flux of 100.
2. Flux of 400.
3. 100 gauss. D.
4. 100 maxwells.
(E3D179) If a 50 turn coil has 2 amperes of current flowing through it, one can say it has:
1. 79.6 gilberts.
2. 100 flux.
3. 100 gauss.
4. 79.6 oersted.
(E3D180) If a 50 turn coil has 2 amperes of current flowing through it and a core length of 2 inches, one can say it has:
1. 24.75 gilberts.
2. 24.75 flux.
3. 24.75 gauss.
4. 24.75 oersted.
(E3D181) In comparing an electric circuit with a magnetic circuit, volts is similar to __, resistance is similar to __, and amperes is similar to __.
1. Gilberts, reluctance, maxwells.
2. Reluctance, gilberts, maxwells.
3. Gilberts, maxwells, reluctance.
4. Maxwell, reluctance, gilberts.
(E3D182) When magnetic lines are cut at a rate of __ lines per second, an average EMF of 1 volt is produced.
1. 10,000.
2. 100,000.
3. 10,000,000.
4. 100,000,000.
(E3D183) Which of the following would shield a permanent-magnet field best?
1. Copper.
2. Iron.
3. Lead.
4. Aluminum.
(E3D184) When induced currents produce expanding magnetic fields around conductors in a direction that opposes the original magnetic field, this is known as:
1. Gilbert's law.
2. Lenz's law.
3. Maxwells' law.
4. Norton's law.
(E3D185) At 240 degrees, what is the amplitude of sine-wave having a peak value of 5 volts?
1. -4.3 volts.
2. -2.5 volts.
3. +2.5 volts.
4. +4.3 volts.
(E3D186) At 150 degrees, what is the amplitude of a sine-wave having a peak value of 5 volts?
1. -4.3 volts.
2. -2.5 volts.
3. +2.5 volts.
4. +4.3 volts.
(E3D187) At pi/3 radius, what is the amplitude of a sine-wave having a peak value of 5 volts?
1. -4.3 volts.
2. -2.5 volts.
3. +2.5 volts.
4. +4.3 volts.
(E3D188) If 4 amperes of current is flowing at 60 degrees, how much will flow at 150 degrees?
1. 2.0 amperes.
2. 2.3 amperes.
3. 3.5 amperes.
4. 4.0 amperes.
(E3D189) If 4 amperes of current is flowing at 30 degrees, how much will flow at 120 degrees?
1. 2.3 amperes.
2. 4.0 amperes.
3. 6.9 amperes.
4. 8.0 amperes.
(E3D190) The frequency that is 2 octaves higher than 1000 Hz is:
1. 2000 Hz.
2. 3000 Hz.
3. 4000 Hz.
4. 5000 Hz.
(E3D191) Which of the following would be considered a transducer?
1. Light emitting diode.
2. Vacuum tube filament.
3. Speaker.
4. Microphone.
(E3D192) What is the inductance in microhenries of a coil having a diameter of 1/2 inch, a length of 1 inch, and 200 turns?
1. 25 microhenries.
2. 204 microhenries.
3. 305 microhenries.
4. 503 microhenries.
(E3D193) If a 10 henry coil has 50 mA of current flowing through it, how much energy is stored in the magnetic field?
1. 0.0125 Joules.
2. 12.5 Joules.
3. 0.500 Joules.
4. 500 Joules.
(E3D194) If two coils are close enough to have a mutual inductance of.2 H and the coils have inductances of 2 H and 8 H, what is the coefficient of coupling?
1. 2.5%.
2. 5.0%.
3. 10%.
4. 25%.
(E3D195) If a power transformer has a primary voltage of 120 Vac, a secondary voltage of 12 volts, and an efficiency of 95 % when delivering 2 amperes of secondary current, what is the value of primary current?
1. 190 milliamperes.
2. 200 milliamperes.
3. 211 milliamperes.
4. 2 amperes.
(E3D196) What is the capacitance of a capacitor with individual plate area of 2 square inches each, an air dielectric, and spacing between the two parallel plates of .01 inches?
1. 45 picofarads.
2. 45 microfarads.
3. 200 picofarads.
4. 200 microfarads.
(E3D197) What is the capacitance of a capacitor with individual plate area of 1 square inch each, an air dielectric, and spacing between the two parallel plates of .01 inches?
1. 2.25 picofarads.
2. 22.5 picofarads.
3. 2.25 microfarads.
4. 22.5 microfarads.
(E3D198) Which of the following materials has a dielectric strength of approximately 80 volts?
1. Air.
2. Bakelite.
3. Glass.
4. Mica.
(E3D199 The electron difference between the plates of a 5 microfarad capacitor connected to 10 Vdc will be:
1. 0.000005 coulombs.
2. 0.00005 coulombs.
3. 31.2 Terra electrons.
4. 3.12 Terra electrons.
(E3D200) If a series circuit consist of an inductor with an inductive reactance of 57.7 ohms and a resistance of 100 ohms, the phase angle between voltage and current will be approximately:
1. 30 degrees.
2. 35 degrees.
3. 55 degrees.
4. 60 degrees.
(E3D201) If a series circuit consist of an inductor with an inductive reactance of 100 ohms and a resistance of 57.7 ohms, the phase angle between voltage and current will be approximately:
1. 30 degrees.
2. 35 degrees.
3. 55 degrees.
4. 60 degrees.
(E3D202) Approximately what capacitance value is needed to resonate a 2.5 millihenry coil to 2.146 MHz?
1. 2.2 picofarads.
2. 2.2 microfarads.
3. 87 picofarads.
4. 87 microfarads.

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