Regulated DC Power Supply Mcqs - Set 4

1)   In a 15 V Zener diode , the breakdown mechanism will occur by ______________?

a. Avalanche mechanism
b. Zener mechanism
c. Both Zener and avalanche mechanism
d. None of the above
Answer  Explanation 

ANSWER: Avalanche mechanism

Explanation:
No explanation is available for this question!


2)   As the junction temperature increases, the voltage breakdown point for Zener mechanism _______________?

a. Is increased
b. Is decreased
c. Remains the same
d. None of the above
Answer  Explanation 

ANSWER: Is decreased

Explanation:
No explanation is available for this question!


3)   A Zener diode utilises_____________characteristic for voltage regulation?

a. Forward
b. Reverse
c. Both forward and reverse
d. None of the above
Answer  Explanation 

ANSWER: Reverse

Explanation:
No explanation is available for this question!


4)   In an unregulated power supply, if input a.c. voltage increases, the output voltage _______________?

a. Increases
b. Decreases
c. Remains the same
d. None of the above
Answer  Explanation 

ANSWER: Increases

Explanation:
No explanation is available for this question!


5)   In an unregulated power supply, if load current increases, the output voltage _____________?

a. Remains the same
b. Decreases
c. Increases
d. None of the above
Answer  Explanation 

ANSWER: Decreases

Explanation:
No explanation is available for this question!


6)   Commercial power supplies have voltage regulation ______________?

a. of 10%
b. of 15%
c. of 25%
d. within 1%
Answer  Explanation 

ANSWER: within 1%

Explanation:
No explanation is available for this question!


7)   A power supply which has voltage regulation of ____________ is unregulated power supply?

a. 0 %
b. 5 %
c. 10 %
d. 8%
Answer  Explanation 

ANSWER: 10 %

Explanation:
No explanation is available for this question!


8)   An ideal regulated power supply is one which has voltage regulation of________________?

a. 0%
b. 5%
c. 10%
d. 1%
Answer  Explanation 

ANSWER: 0%

Explanation:
No explanation is available for this question!


9)   The rupture of co-valent bonds will occur when the electric field is__________________?

a. 100 V/cm
b. 6 V/cm
c. 1000 V/cm
d. More than 105 V/cm
Answer  Explanation 

ANSWER: More than 105 V/cm

Explanation:
No explanation is available for this question!


10)   Zener diode can be used as__________________?

a. ac. voltage regulator only
b. dc. voltage regulator only
c. both D.C and A.C voltage regulator
d. none of the above
Answer  Explanation 

ANSWER: both D.C and A.C voltage regulator

Explanation:
No explanation is available for this question!