Explore topic-wise MCQs in Electric Drives.

This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives knowledge and support exam preparation. Choose a topic below to get started.

1.

TRIAC is a unipolar switch.

A. True
B. False
Answer» C.
Discussion
2.

Full form of TRIAC is __________

A. Triode for Alternating current
B. Tri for Alternating current
C. Triode for Alternating counter
D. Tri for Alternating counters
Answer» B. Tri for Alternating current
Discussion
3.

Full form of SCR is ____________

A. Silicon controlled rectifier
B. State-controlled rectifier
C. State cover rectifier
D. State-controlled reset
Answer» B. State-controlled rectifier
Discussion
4.

Calculate the Vo(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 480 V and the value of firing angle is 92°.

A. 264.02 V
B. 487.26 V
C. 858.26 V
D. 248.25 V
Answer» B. 487.26 V
Discussion
5.

Calculate the form factor if V(r.m.s)=45 V, V(avg)=15 V.

A. 2
B. 5
C. 3
D. 8
Answer» D. 8
Discussion
6.

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 170° and supply frequency is 50.5 Hz.

A. 32.4 msec
B. 35.2 msec
C. 39.3 msec
D. 31.5 msec
Answer» E.
Discussion
7.

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 13° and supply frequency is 49.5 Hz.

A. 730.2 msec
B. 740.8 msec
C. 754.5 msec
D. 755.1 msec
Answer» B. 740.8 msec
Discussion
8.

In 3-Φ Semi-controlled rectifier calculate the average value of the voltage if the supply is 299 V and firing angle is 56.15°.

A. 311.26 V
B. 304.26 V
C. 314.51 V
D. 312.45 V
Answer» D. 312.45 V
Discussion
9.

Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 16°.

A. 0.96
B. .91
C. .93
D. .94
Answer» C. .93
Discussion
10.

Calculate the Vo(avg) for the 3-Φ phase Half-wave controlled rectifier if the supply value is 364 V and the value of firing angle is 2°.

A. 247.62 V
B. 245.76 V
C. 214.26 V
D. 233.26 V
Answer» C. 214.26 V
Discussion
11.

Calculate the Vo(r.m.s) (Highly inductive load) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 441 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 441 V.a) 297.25 Vb) 298.15 Vc) 298.11 Vd) 300.15 V
Answer» B. 298.15 V
Discussion
12.

In 3-Φ Fully controlled rectifier calculate the average value of the voltage if the supply is 400 V and firing angle is 45°.

A. 381.15 V
B. 382.16 V
C. 383.19 V
D. 384.25 V
Answer» C. 383.19 V
Discussion
13.

Calculate the average value of current for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 400 V and resistive load value is 5 Ω.

A. 54.04 A
B. 57.26 A
C. 51.64 A
D. 58.15 A
Answer» B. 57.26 A
Discussion
14.

Calculate the pulse number if the supply frequency is 2π and the output frequency is 2π÷3.

A. 4
B. 5
C. 6
D. 3
Answer» E.
Discussion
15.

Calculate the Vo(avg) for the 3-Φ phase Half-wave uncontrolled rectifier if the supply value is 440 V.

A. 297.25 V
B. 298.15 V
C. 298.11 V
D. 300.15 V
Answer» B. 298.15 V
Discussion