Explore topic-wise MCQs in Electric Drives.

This section includes 9 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.

Which one of the following devices have low power losses?

A. MOSFET
B. IGBT
C. SCR
D. BJT
Answer» D. BJT
Discussion
2.

Calculate the shaft power developed by a motor using the given data: Eb = 50V and I = 60 A. Assume frictional losses are 400 W and windage losses are 600 W.

A. 4000 W
B. 2000 W
C. 1000 W
D. 1500 W
Answer» C. 1000 W
Discussion
3.

Which of the following converter circuit operations will be unstable for a large duty cycle ratio?

A. Buck converter
B. Boost converter
C. Buck-Boost converter
D. Boost converter and Buck-Boost converter
Answer» E.
Discussion
4.

A Buck-Boost converter is used to _________

A. Step down the voltage
B. Step up the voltage
C. Equalize the voltage
D. Step up and step down the voltage
Answer» E.
Discussion
5.

The principle of step-up chopper can be employed for the ________

A. Motoring mode
B. Regenerative mode
C. Plugging
D. Reverse motoring mode
Answer» C. Plugging
Discussion
6.

Calculate the value of the angular acceleration of the motor using the given data: J= 50 kg-m2, load torque = 40 N-m, motor torque = 10 N-m.

A. -.7 rad/s<sup>2</sup>
B. -.6 rad/s<sup>2</sup>
C. -.3 rad/s<sup>2</sup>
D. -.4 rad/s<sup>2</sup>
Answer» C. -.3 rad/s<sup>2</sup>
Discussion
7.

The unit of angular acceleration is rad/s2.

A. True
B. False
Answer» B. False
Discussion
8.

A 220 V, 1000 rpm, 60 A separately-excited dc motor has an armature resistance of .5 . It is fed from single-phase full converter with an ac source voltage of 230 V, 50Hz. Assuming continuous conduction, the firing angle for rated motor torque at (-400) rpm is _________

A. 122.4
B. 117.6
C. 130.1
D. 102.8
Answer» E.
Discussion
9.

Duty cycle (D) is _______

A. Ton Toff
B. Ton (Ton+ Toff)
C. Ton 2 (Ton+ Toff)
D. Ton 2 Toff
Answer» C. Ton 2 (Ton+ Toff)
Discussion