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General Class Exam Question Pool

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

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2015-G7A: Power supplies; and schematic symbols

2015-G7A01: What useful feature does a power supply bleeder resistor provide?

It ensures that the filter capacitors are discharged when power is removed

It acts as a fuse for excess voltage

It removes shock hazards from the induction coils

It eliminates ground loop current



2015-G7A02: Which of the following components are used in a power supply filter network?

Capacitors and inductors

Diodes

Transformers and transducers

Quartz crystals



2015-G7A03: What is the peak-inverse-voltage across the rectifiers in a full-wave bridge power supply?

Equal to the normal peak output voltage of the power supply

One-quarter the normal output voltage of the power supply

Half the normal output voltage of the power supply

Double the normal peak output voltage of the power supply



2015-G7A04: What is the peak-inverse-voltage across the rectifier in a half-wave power supply?

Two times the normal peak output voltage of the power supply

One-half the normal peak output voltage of the power supply

One-half the normal output voltage of the power supply

Equal to the normal output voltage of the power supply



2015-G7A05: What portion of the AC cycle is converted to DC by a half-wave rectifier?

180 degrees

90 degrees

270 degrees

360 degrees



2015-G7A06: What portion of the AC cycle is converted to DC by a full-wave rectifier?

360 degrees

90 degrees

180 degrees

270 degrees



2015-G7A07: What is the output waveform of an unfiltered full-wave rectifier connected to a resistive load?

A series of DC pulses at twice the frequency of the AC input

A series of DC pulses at the same frequency as the AC input

A sine wave at half the frequency of the AC input

A steady DC voltage



2015-G7A08: Which of the following is an advantage of a switchmode power supply as compared to a linear power supply?

High frequency operation allows the use of smaller components

Faster switching time makes higher output voltage possible

Fewer circuit components are required

All of these choices are correct



2015-G7A09: Which symbol in figure G7-1 represents a field effect transistor?

Symbol 1

Symbol 2

Symbol 5

Symbol 4



2015-G7A10: Which symbol in figure G7-1 represents a Zener diode?

Symbol 5

Symbol 4

Symbol 1

Symbol 11



2015-G7A11: Which symbol in figure G7-1 represents an NPN junction transistor?

Symbol 2

Symbol 1

Symbol 7

Symbol 11



2015-G7A12: Which symbol in Figure G7-1 represents a multiple-winding transformer?

Symbol 6

Symbol 4

Symbol 7

Symbol 1



2015-G7A13: Which symbol in Figure G7-1 represents a tapped inductor?

Symbol 7

Symbol 11

Symbol 6

Symbol 1





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