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Multiple Choice Quiz
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1
Switching power supplies regulate output voltage by using
A)phase-width modulation
B)frequency modulation
C)amplitude modulation
D)pulse-width modulation
2
Which fast-recovery rectifier is often used in switch-mode power supplies?
A)zener
B)Schottky
C)varistor
D)silicon
3
What device can be considered a dc transformer and is used for step-up and step-down action and for isolation?
A)converter
B)inverter
C)autotransformer
D)variac
4
In the circuit shown, what is the function of Q1?
A)current limiter
B)series pass transistor
C)signal amplifier
D)rectifier
5
In the circuit shown, what happens if the load demands too much current?
A)the 7812 burns up
B)R1 opens
C)Q2 turns on
D)Q2 turns off





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