# DC/DC Conversion MCQ Questions & Answers

DC/DC Conversion MCQs : This section focuses on the "DC/DC Conversion". These Multiple Choice Questions (MCQs) should be practiced to improve the DC/DC Conversion skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

____________ is the boundary for C.C.M and D.C.M mode in 3-? Half wave bridge rectifier for R load.

A. 60°
B. 10°
C. 80°
D. 30°

Question 2

Buck-Boost acts as Boost converter for duty cycle is equal to _________

A. 0.8
B. 0.1
C. 0.2
D. 0.4

Question 3

Buck-Boost acts as Buck converter for duty cycle is equal to _________

A. 0.9
B. 0.7
C. 0.6
D. 0.4

Question 4

Calculate peak-peak voltage if Vmax=1 V and Vmin=-1 V.

A. 6 V
B. 2 V
C. 3 V
D. 1 V

Question 5

Calculate the average value of thyristor current in 3-? Full wave converter for the load current=27 A and ?=6°.

A. 9 A
B. 4 A
C. 5 A
D. 9 A

Question 6

Calculate the output voltage of the Boost converter if the supply voltage is 156 V and duty cycle value is .4.

A. 260 V
B. 264 V
C. 261 V
D. 268 V

Question 7

Calculate the output voltage of the Buck converter if the supply voltage is 789 V and duty cycle value is .9.

A. 711.1 V
B. 710.1 V
C. 722.2 V
D. 713.2 V

Question 8

Calculate the value of Crest factor if Vpeak=0 V and Vr.m.s=24 V.

A. 0
B. 3
C. 5
D. 8

Question 9

Choppers are used to control the DC voltage level.

A. True
B. False

Question 10

Cuk-converter is better than Buck converter in terms of the output voltage.

A. True
B. False

Question 11

Inductor and Capacitor in Buck converter are used to ___________

A. Increase the cost
B. Decrease the cost
C. Filter out the harmonics
D. Increase the harmonics

Question 12

What is the formula for output voltage for Boost converter?

A. 8D×Vin
B. 5D×Vin
C. 2D×Vin
D. D×Vin

Question 13

What is the formula for output voltage for Buck-Boost converter?

A. D×Vin
B. Vin ÷ (1-D)
C. D×Vin ÷ (1-D)
D. D×Vin ÷ (1+D)

Question 14

Which one of the following device is uncontrolled?

A. SCR
B. MOSFET
C. Diode
D. TRIAC

Question 15

____________ is the boundary for C.C.M and D.C.M mode in 3-Φ Half wave bridge rectifier for R load.

A. 60°
B. 10°
C. 80°
D. 30°