Explore topic-wise MCQs in Electrical Machines.

This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Machines knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following are applications of singly excited magnetic systems?

A. electromagnets, relays
B. moving-iron instruments
C. reluctance motors
D. all of the mentioned
Answer» E.
2.

Single phase reluctance motors are extensively used in ________

A. grinder applications
B. driving electric clocks and other timing devices
C. welding applications
D. lifts/ elevators
Answer» C. welding applications
3.

The single phase reluctance machine acts as a generator when angle is _______

A. positive
B. negative
C. zero
D. any of the mentioned
Answer» C. zero
4.

For a given reluctance motor, Rld and Rlq are ________

A. constant
B. varying
C. zero
D. all of the mentioned
Answer» B. varying
5.

For a reluctance motor, the maximum average torque occurs when = __________

A. 45
B. 90
C. 0
D. 180
Answer» B. 90
6.

The variation of reluctance Rl with space angle r depends on the shape of __________

A. stator poles
B. rotor poles
C. stator or rotor poles
D. both stator and rotor poles
Answer» E.
7.

The reluctance offered to the stator flux by two small air gaps in series with high permeability iron, in reluctance machine is minimum, when the space angle r = ___________

A. 0
B. 45
C. 90
D. 270
Answer» B. 45
8.

The reluctance offered to the stator flux by two very large air gaps in series with high permeability iron, in reluctance machine is maximum, when the space angle r = ___________

A. 0
B. 45
C. 90
D. 180
Answer» D. 180
9.

Space angle, r is measured between stator d-axis and _______________

A. quadrature axis
B. direct d-axis
C. long rotor axis
D. none of the mentioned
Answer» D. none of the mentioned
10.

What is the angle between stator direct axis and quadrature axis?

A. 90
B. 0
C. 45
D. 60
Answer» B. 0