# Slip Energy Recovery MCQ Questions & Answers

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

Question 1

A 2-pole, 3-phase, ______ Hz induction motor is operating at a speed of 550 rpm. The frequency of the rotor current of the motor in Hz is 2.

A. 9.98
B. 9.71
C. 9.12
D. 9.37

Question 2

At low values of slip, the electromagnetic torque is directly proportional to ___________

A. s
B. s2
C. s3
D. s4

Question 3

Calculate the average value of the sinusoidal waveform x(t)=848sin(1.65?t+2?÷0.68).

A. 0
B. 78 V
C. 15 V
D. 85 V

Question 4

Calculate the time period of the waveform v(t)=12sin(8?t+8?÷15)+144sin(2?t+?÷6)+ 445sin(?t+7?÷6).

A. 8 sec
B. 4 sec
C. 7 sec
D. 3 sec

Question 5

Calculate the total heat dissipated in a resistor of 44 ? when 0 A current flows through it.

A. 0 W
B. 2 W
C. 1.5 W
D. .3 W

Question 6

If induction motor air gap power is 1.8 KW and gross developed power is .1 KW, then rotor ohmic loss will be _________ KW.

A. 1.7
B. 2.7
C. 3.7
D. 4.7

Question 7

In the rotor voltage injection method, when an external voltage source is in opposite phase with the main voltage then speed will ___________

A. Increase
B. Decrease
C. Remain unchanged
D. First increases then decrease

Question 8

In the rotor voltage injection method, when an external voltage source is in phase with the main voltage then speed will ___________

A. Increase
B. Decrease
C. Remain unchanged
D. First increases then decrease

Question 9

The power factor of a squirrel cage induction motor is ___________

A. High at light load only
B. High at heavy loads only
C. Low at the light and heavy loads both
D. Low at rate load only

Question 10

The rotor injection method is a part of the slip changing technique.

A. True
B. False

Question 11

The slip recovery scheme is a part of the synchronous speed changing technique.

A. True
B. False

Question 12

The slope of the V-I curve is 9.1°. Calculate the value of resistance. Assume the relationship between voltage and current is a straight line.

A. .16 ?
B. .26 ?
C. .25 ?
D. .44 ?

Question 13

The value of slip at which maximum torque occurs ________

A. R2÷X2
B. 4R2÷X2
C. 2R2÷X2
D. R2÷3X2

Question 14

Calculate the average value of the sinusoidal waveform x(t)=848sin(1.65πt+2π÷0.68).

A. 0
B. 78 V
C. 15 V
D. 85 V

Question 15

Calculate the time period of the waveform v(t)=12sin(8πt+8π÷15)+144sin(2πt+π÷6)+ 445sin(πt+7π÷6).

A. 8 sec
B. 4 sec
C. 7 sec
D. 3 sec

Question 16

Calculate the total heat dissipated in a resistor of 44 Ω when 0 A current flows through it.

A. 0 W
B. 2 W
C. 1.5 W
D. .3 W