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NEW General Class Exam Question Pool

effective 7/01/2015 thru 6/30/2019

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2015-G5C: Resistors, capacitors, and inductors in series and parallel; transformers

2015-G5C01: What causes a voltage to appear across the secondary winding of a transformer when an AC voltage source is connected across its primary winding?

Mutual inductance

Capacitive coupling

Displacement current coupling

Mutual capacitance



2015-G5C02: What happens if you reverse the primary and secondary windings of a 4:1 voltage step down transformer?

The secondary voltage becomes 4 times the primary voltage

The transformer no longer functions as it is a unidirectional device

Additional resistance must be added in series with the primary to prevent overload

Additional resistance must be added in parallel with the secondary to prevent overload



2015-G5C03: Which of the following components should be added to an existing resistor to increase the resistance?

A resistor in series

A resistor in parallel

A capacitor in series

A capacitor in parallel



2015-G5C04: What is the total resistance of three 100 ohm resistors in parallel?

33.3 ohms

0.30 ohms

0.33 ohms

300 ohms



2015-G5C05: If three equal value resistors in series produce 450 ohms, what is the value of each resistor?

150 ohms

1500 ohms

90 ohms

175 ohms



2015-G5C06: What is the RMS voltage across a 500-turn secondary winding in a transformer if the 2250-turn primary is connected to 120 VAC?

26.7 volts

2370 volts

540 volts

5.9 volts



2015-G5C07: What is the turns ratio of a transformer used to match an audio amplifier having 600 ohm output impedance to a speaker having 4 ohm impedance?

12.2 to 1

24.4 to 1

150 to 1

300 to 1



2015-G5C08: What is the equivalent capacitance of two 5.0 nanofarad capacitors and one 750 picofarad capacitor connected in parallel?

10.750 nanofarads

576.9 nanofarads

1733 picofarads

3583 picofarads



2015-G5C09: What is the capacitance of three 100 microfarad capacitors connected in series?

33.3 microfarads

0.30 microfarads

0.33 microfarads

300 microfarads



2015-G5C10: What is the inductance of three 10 millihenry inductors connected in parallel?

3.3 millihenrys

0.30 henrys

3.3 henrys

30 millihenrys



2015-G5C11: What is the inductance of a 20 millihenry inductor connected in series with a 50 millihenry inductor?

70 millihenrys

0.07 millihenrys

14.3 millihenrys

1000 millihenrys



2015-G5C12: What is the capacitance of a 20 microfarad capacitor connected in series with a 50 microfarad capacitor?

14.3 microfarads

0.07 microfarads

70 microfarads

1000 microfarads



2015-G5C13: Which of the following components should be added to a capacitor to increase the capacitance?

A capacitor in parallel

An inductor in series

A resistor in series

A capacitor in series



2015-G5C14: Which of the following components should be added to an inductor to increase the inductance?

An inductor in series

A capacitor in series

A resistor in parallel

An inductor in parallel



2015-G5C15: What is the total resistance of a 10 ohm, a 20 ohm, and a 50 ohm resistor connected in parallel?

5.9 ohms

0.17 ohms

10000 ohms

80 ohms



2015-G5C16: Why is the conductor of the primary winding of many voltage step up transformers larger in diameter than the conductor of the secondary winding?

To accommodate the higher current of the primary

To improve the coupling between the primary and secondary

To prevent parasitic oscillations due to resistive losses in the primary

To insure that the volume of the primary winding is equal to the volume of the secondary winding



2015-G5C17: What is the value in nanofarads (nF) of a 22,000 pF capacitor?

22 nF

0.22 nF

2.2 nF

220 nF



2015-G5C18: What is the value in microfarads of a 4700 nanofarad (nF) capacitor?

4.7 µF

47 µF

0.47 µF

47,000 µF





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2015-G5B: The Decibel; current and voltage dividers; electrical power calculations; sine wave root-mean-square (RMS) values; PEP calculations
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2015-G6A: Resistors; Capacitors; Inductors; Rectifiers; solid state diodes and transistors; vacuum tubes; batteries
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