# Switch-Reluctance Motor MCQ Questions & Answers

Switch-Reluctance Motor MCQs : This section focuses on the "Switch-Reluctance Motor". These Multiple Choice Questions (MCQs) should be practiced to improve the Switch-Reluctance Motor skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

An infinite bus-bar has _____________

A. Constant voltage
B. Constant frequency
C. Constant voltage and frequency
D. constant speed

Question 2

Calculate mark to space ratio if the system is on for 4 sec and off time is 9 sec.

A. 0.54
B. 0.44
C. 0.45
D. 0.46

Question 3

Calculate peak-peak voltage if Vmax=180 V and Vmin=60 V.

A. 120 V
B. 150 V
C. 170 V
D. 110 V

Question 4

Calculate the circuit turn-off time for 3-? Fully controlled rectifier if the firing angle is 120° and supply frequency is 60 Hz.

A. 1.8 msec
B. 3.2 msec
C. 6.3 msec
D. 2.7 msec

Question 5

Calculate the circuit turn-off time for 3-? Fully controlled rectifier if the firing angle is 27° and supply frequency is 50 Hz.

A. 11.8 msec
B. 14.4 msec
C. 16.1 msec
D. 16.5 msec

Question 6

Calculate the reactive power in a 24.5 ? resistor.

A. 0 VAR
B. 5 VAR
C. 8 VAR
D. 9 VAR

Question 7

Calculate the value of Crest factor if Vpeak=798 V and Vr.m.s=489 V.

A. 1.63
B. 1.54
C. 1.59
D. 1.26

Question 8

Calculate the value of the duty cycle if the system is on for 1 sec and off for 17 sec.

A. 0.055
B. 0.781
C. 0.484
D. 0.947

Question 9

Calculate the value of the frequency if the inductive reactance is 60 ? and the value of the inductor is 4 H.

A. 2.38 Hz
B. 5.54 Hz
C. 4.65 Hz
D. 9.42 Hz

Question 10

Calculate the value of the Input power factor for 3-? Fully controlled rectifier if the firing angle value is 90°.

A. 0
B. 0.2
C. 0.3
D. 0.4

Question 11

Increasing the stator poles ___________ the speed of Reluctance motor.

A. Decreases
B. Increases
C. Remains the same
D. Negative

Question 12

Reluctance motor can operate on DC supply.

A. True
B. False

Question 13

Reluctance motor operates at power factor of __________

A. 0.8
B. 0.2
C. 0.3
D. 0.9

Question 14

Reluctance motors are singly-excited.

A. True
B. False

Question 15

Which of the following motor is used in recording instruments?

A. Reluctance motor
B. Induction motor
C. Synchronous motor
D. DC motor

Question 16

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 120° and supply frequency is 60 Hz.

A. 1.8 msec
B. 3.2 msec
C. 6.3 msec
D. 2.7 msec

Question 17

Calculate the circuit turn-off time for 3-Φ Fully controlled rectifier if the firing angle is 27° and supply frequency is 50 Hz.

A. 11.8 msec
B. 14.4 msec
C. 16.1 msec
D. 16.5 msec

Question 18

Calculate the reactive power in a 24.5 Ω resistor.

A. 0 VAR
B. 5 VAR
C. 8 VAR
D. 9 VAR

Question 19

Calculate the value of the frequency if the inductive reactance is 60 Ω and the value of the inductor is 4 H.

A. 2.38 Hz
B. 5.54 Hz
C. 4.65 Hz
D. 9.42 Hz