Explore topic-wise MCQs in Electric Drives.

This section includes 14 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.

Calculate the 3- power developed in the IM connected in star using the following data: Vp=7 V, IL=7 A, cos =.6.

A. 88.5 W
B. 88.4 W
C. 88.8 W
D. 88.2 W
Answer» E.
Discussion
2.

Choose the correct relationship in Star connection with the positive sequence.

A. V<sub>L</sub>=V<sub>p</sub>
B. V<sub>L</sub>= 3V<sub>p</sub>
C. V<sub>L</sub>= 2V<sub>p</sub>
D. I<sub>L</sub>= 3I<sub>p</sub>
Answer» C. V<sub>L</sub>= 2V<sub>p</sub>
Discussion
3.

Choose the correct relationship in delta connection with the positive sequence.

A. I<sub>L</sub>=I<sub>p</sub>
B. V<sub>L</sub>= 3V<sub>p</sub>
C. V<sub>L</sub>=V<sub>p</sub>
D. I<sub>L</sub>= 3I<sub>p</sub>
Answer» E.
Discussion
4.

What is the relationship between line and phase current in Star connection with the positive sequence?

A. V<sub>L</sub>=V<sub>p</sub>
B. V<sub>L</sub>= 9V<sub>p</sub>
C. V<sub>L</sub>= 2V<sub>p</sub>
D. I<sub>L</sub>=I<sub>p</sub>
Answer» E.
Discussion
5.

What is the correct relationship between the phase voltage and line voltage in Delta connection with the positive sequence?

A. V<sub>L</sub>=V<sub>p</sub>
B. V<sub>L</sub>= 3V<sub>p</sub>
C. V<sub>L</sub>= 2V<sub>p</sub>
D. I<sub>L</sub>= 2I<sub>p</sub>
Answer» B. V<sub>L</sub>= 3V<sub>p</sub>
Discussion
6.

Full form of PWM.

A. Pulse width modulation
B. Pulse run modulation
C. Power width modulation
D. Pulse wisdom mode
Answer» B. Pulse run modulation
Discussion
7.

Calculate the average power dissipated if the value of the duty cycle is .5 and Pmax=12 W.

A. 6 W
B. 5 W
C. 4 W
D. 3 W
Answer» B. 5 W
Discussion
8.

Calculate mark to space ratio if the system is on for 20 sec and off for 3 sec.

A. 6.66
B. 4.48
C. 8.2
D. 5.6
Answer» B. 4.48
Discussion
9.

The unit of the moment of inertia is Joule.

A. True
B. False
Answer» C.
Discussion
10.

Calculate the 3- power developed in the IM using the following data: VL=20 V, IL=5 A, cos =.8.

A. 138.56 W
B. 128.41 W
C. 163.78 W
D. 177.59 W
Answer» B. 128.41 W
Discussion
11.

450-seconds rated motor is preferable for __________

A. Light duty cranes
B. Medium duty cranes
C. Intermittent duty cranes
D. Heavy duty cranes
Answer» B. Medium duty cranes
Discussion
12.

Voltage rating of the IM depends upon the insulation level.

A. True
B. False
Answer» B. False
Discussion
13.

Current rating of the IM depends upon the cross-section area of the conductors.

A. True
B. False
Answer» B. False
Discussion
14.

Which one of the following motor is a 1- AC motor?

A. Synchronous motor
B. Series motor
C. Shunt motor
D. Capacitor run
Answer» E.
Discussion