Voltage Regulators - General Questions (3)

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Voltage Regulators - General Questions

17. 

Voltage regulation requires
A. only line regulation.
B. only load regulation.
C. a constant load.
D. load and line regulation.

Answer: Option D

Explanation:

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18. 

Which component(s) set(s) the voltage across the load in a basic transistor shunt regulator?
A. Zener diode
B. Transistor base-emitter voltage
C. Both the Zener diode and the transistor base-emitter voltage
D. None of the above

Answer: Option C

Explanation:

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19. 

In this op-amp series regulator circuit, which of the following components is the comparator circuit?

mcq15_02200
A. Op-amp
B. Transistor Q1
C. R1 and R2 resistors
D. Zener diode

Answer: Option A

Explanation:

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20. 

What are the typical values of Vref and Iadj for the LM317 adjustable voltage regulator?
A. 1.0 V, 100 mA
B. 1.5 V, 100 mA
C. 1.25 V, 100 μA
D. 1.25 V, 10 mA

Answer: Option C

Explanation:

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21. 

How many terminals does a 7800 series IC regulator have?
A. 2
B. 3
C. 4
D. none of the above

Answer: Option B

Explanation:

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22. 

Calculate the ripple of a capacitor filter for a peak rectified voltage of 40 V, a capacitor value C = 75 mu (3)1 F, and a load current of 40 mA.
A. 3.2%
B. 3.59%
C. 4.03%
D. 4.59%

Answer: Option A

Explanation:

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23. 

Refer to the given figure. If a solder splash shorted the ends of R1 to each other,

mcq18_1006_1a (3)
A. the op-amp would fail.
B. Q1 would open.
C. the output voltage would not change.
D. the zener would fail.

Answer: Option D

Explanation:

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24. 

How many diodes conduct in the full-wave bridge rectifier while the capacitor is being charged?
A. 1
B. 2
C. 3
D. 4

Answer: Option B

Explanation:

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