Voltage Regulators - Electronic Engineering (MCQ) questions & answers

1)   Which among the following are regarded as three-pin voltage regulator ICs?

a. Fixed voltage regulators
b. Adjustable voltage regulators
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


2)   Due to operation of series pass transistor in an active region of linear voltage regulator, ___________

a. The ripple contents in o/p voltage waveform is very low
b. Then there is no necessity of using high speed transitor
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Both a and b

Explanation:
No explanation is available for this question!


3)   Which type of IC voltage regulator exhibits continuous variation in the impedance of transistor in order to supply the desired load current?

a. Linear regulators
b. Switching regulators
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Linear regulators

Explanation:
No explanation is available for this question!


4)   In LM317 voltage regulator, what is the minimum value of voltage required between its input & output in order to supply power to an internal circuit?

a. 1V
b. 3V
c. 5V
d. 10V
Answer  Explanation 

ANSWER: 3V

Explanation:
No explanation is available for this question!


5)   In LM317 voltage regulator, the protective diodes do not allow the filter capacitors to discharge through ______current points.

a. High
b. Low
c. Both a and b
d. None of the above
Answer  Explanation 

ANSWER: Low

Explanation:
No explanation is available for this question!


6)   In a linear IC voltage regulator, series pass transistor always operates in ______ region.

a. Active
b. Saturation
c. Cut-off
d. All of the above
Answer  Explanation 

ANSWER: Active

Explanation:
No explanation is available for this question!


7)   Switching regulators are series type regulators, which has ______ power dissipation & ______ efficiency.

a. increased, increased
b. increased, reduced
c. reduced, increased
d. reduced, reduced
Answer  Explanation 

ANSWER: reduced, increased

Explanation:
No explanation is available for this question!


8)   The % load regulation of a power supply should be ideally ________ & practically _______.

a. zero, small
b. small, zero
c. zero, large
d. large, zero
Answer  Explanation 

ANSWER: zero, small

Explanation:
No explanation is available for this question!


9)   Which performance parameter of a regulator is defined as the change in regulated load voltage due to variation in line voltage in a specified range at a constant load current?

a. Load regulation
b. Line regulation
c. Temperature stability factor
d. Ripple rejection
Answer  Explanation 

ANSWER: Line regulation

Explanation:
No explanation is available for this question!


10)   Which among the following factors affect/s the output voltage of a regulated power supply?

a. Load current
b. Input voltage
c. Temperature
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!