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
Question 20
Calculate the value of the Input power factor for 3-Φ Fully controlled rectifier if the firing angle value is 90°.
A. 0
B. 0.2
C. 0.3
D. 0.4