Explore topic-wise MCQs in Electric Drives Questions and Answers.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Electric Drives Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

780 V, 97 A, 1360 rpm separately excited dc motor with armature resistance (Ra) equal to 9 ohms. Calculate back emf developed in the motor when it operates on one-fourth of the full load. (Assume rotational losses are neglected)

A. 564.75 V
B. 561.75 V
C. 562.45 V
D. 565.12 V
Answer» C. 562.45 V
Discussion
2.

Calculate the power developed by a motor using the given data: Eb= 48 V and I= 86 A (Assume rotational losses are neglected.)

A. 4128 W
B. 4150 W
C. 4140 W
D. 4170 W
Answer» B. 4150 W
Discussion
3.

Calculate the radius of the circular ring having a moment of inertia 59 kgm2 and mass of 69 kg.

A. .924 m
B. .928 m
C. .934 m
D. .944 m
Answer» B. .928 m
Discussion
4.

The slope of the V-I curve is 31°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. 0.600 Ω
B. 0.607 Ω
C. 0.543 Ω
D. 0.648 Ω
Answer» B. 0.607 Ω
Discussion
5.

Calculate the value of the angular acceleration of the motor using the given data: J = 81 kg-m2, load torque = 74 N-m, motor torque = 89 N-m.

A. .195 rad/s2
B. .182 rad/s2
C. .183 rad/s2
D. .185 rad/s2
Answer» E.
Discussion