Practice Electric Drives Multiple Choice Multiple Choice Questions with Answers Quiz-1

Q.1.

For α > 90°, 3-Φ Full wave bridge rectifier acts as a natural commutated inverter.

a) True
b) False

Explanation

Q.2.

What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R-L load?

a) 3Vml(cos(∝))÷2π
b) 3Vml(cos(∝))÷π
c) 2Vml(cos(∝))÷π
d) 6Vml(cos(∝))÷π

Explanation

Q.3.

The output voltage of 3-Φ Full wave bridge rectifier is six times of 3-Φ Half-wave rectifier.

a) True
b) False

Explanation

Q.4.

What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R load for α < 60°?

a) 2Vml(cos(∝))÷π
b) 3Vml(cos(∝))÷2π
c) 3Vml(cos(∝))÷π
d) 6Vml(cos(∝))÷π

Explanation

Q.5.

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

a) 60°
b) 10°
c) 80°
d) 50°

Explanation

Q.6.

What is the formula for output voltage for 3-Φ Full wave bridge rectifier for R load for α > 60°?

a) 2Vml(1+cos(∝+60°))÷π
b) 3Vml(1+cos(60°+∝))÷2π
c) 3Vml(1+cos(60°+∝))÷π
d) 6Vml(cos(∝))÷π

Explanation

Q.7.

Calculate the r.m.s value of thyristor current in 3-Φ Full wave converter for the load current=4 A and α=12°.

a) 2.3 A
b) 2.5 A
c) 2.7 A
d) 2.9 A

Explanation

Q.8.

Calculate the average value of thyristor current in 3-Φ Full wave converter for the load current=9 A and α=26°.

a) 4 A
b) 5 A
c) 7 A
d) 3 A

Explanation

Q.9.

Calculate the De-rating factor if the string efficiency is%.

a) .84
b) .44
c) .5
d) .6

Explanation

Q.10.

Full form of MOSFET is ___________

a) Metal oxide silicon field effect transistor
b) Metal oxide semiconductor field effect transistor
c) Metal oxide settle field effect transistor
d) Metal oriented silicon field effect transistor

Explanation

Q.11.

Full form of FET is ___________

a) Field effect transistor
b) Field engage transistor
c) Field effect terminal
d) Fire engage transistor

Explanation

Q.12.

Calculate the compensator rating required for sin(Φ)=.13.

a) 0.45 P.U
b) 0.12 P.U
c) 0.13 P.U
d) 0.82 P.U

Explanation

Q.13.

Full form of DIAC is ___________

a) Digital Alternating current
b) Discrete Alternating current
c) Diode for Alternating current
d) Digital Alternating counter

Explanation

Q.14.

Which harmonic is not present in 3-Φ fully controlled rectifier?

a) 81st harmonic
b) 15th harmonic
c) 17th harmonic
d) 11th harmonic

Explanation

Q.15.

Fifth lowest order harmonic present in 3-Φ fully controlled rectifier is __________

a) 15th
b) 17th
c) 13th
d) 12th

Explanation

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