ELECTRICAL MACHINE 25 IMPORTANT MCQ
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1. EMF Method is used for calculation of
A)Voltage Regulation
A)Voltage Regulation
B)Efficiency
C)Losses
D) None of these
ANSWER:A
2. Slip of Induction Motor at Starting
A)0
A)0
B)1
C)0.5
D)0.3
D)0.3
ANSWER:B
ELECTRICAL MACHINE 25 IMPORTANT MCQ
3. Squirrel Cage Induction Motor is having
A)High Starting Torque
A)High Starting Torque
B) Low Starting Torque
C) Both A&B
C) Both A&B
D) None of these
ANSWER:B
4. Slipring Induction Motor is having
A)High Starting Torque
A)High Starting Torque
B) Low Starting Torque
C) Both A&B
C) Both A&B
D) None of these
ANSWER:A
5. RMF Means
A) Rotating Motive Force
A) Rotating Motive Force
B) Rotating Magnetic Field
C) Rotating Mechanical force
C) Rotating Mechanical force
D) None
ANSWER:B
ELECTRICAL MACHINE 25 IMPORTANT MCQ
6. Synchronous Speed (Ns)
A) 120f/P
A) 120f/P
B) 120P/f
C) Both A&B
D)None of these
ANSWER:A
7. Voltage Regulation is
A)E-V/V
A)E-V/V
B) V-E/V
C) E-V/E
D)V-E/E
ANSWER:A
8. Slip of Induction motor
A)Ns-Nr/Ns
A)Ns-Nr/Ns
B)Nr-Ns/Ns
C) Ns-Nr/Nr
D) None of these
ANSWER:A
ELECTRICAL MACHINE 25 IMPORTANT MCQ
9. Three Phase Slip ring Induction motor rotor is having
A) Three phase winding
A) Three phase winding
B) Single Phase winding
C) Two Phase winding
C) Two Phase winding
D) None of these
ANSWER:A
10.Three Phase Squirrel cage Induction motor rotor is having
A) Three phase winding
A) Three phase winding
B) Single Phase winding
C) Two Phase winding
C) Two Phase winding
D)Short Circuited Copper Bars
ANSWER:D
11. Induction motor Stator Voltage control method is used for
A) Speed control
A) Speed control
B) Frequency Control
C) Both A&B
D) None of these
ANSWER:A
ELECTRICAL MACHINE 25 IMPORTANT MCQ
12.Three phase Induction motor stator is of
A) 3-phase supply
A) 3-phase supply
B) 1-phase Supply
C) Both A&B
D) None of these
ANSWER:A
13. Induction Motor operates on the principle of
A)Induction
A)Induction
B) Conduction
C) Both A&B
D) None of these
ANSWER:A
14. Motor is a machine which converts
A) Mechanical Energy into Electrical Energy
A) Mechanical Energy into Electrical Energy
B) Electrical Energy into Mechanical Energy
C) Both A&B
C) Both A&B
D) None of these
ANSWER:B
ELECTRICAL MACHINE 25 IMPORTANT MCQ
15. Generator is a machine which converts
A) Mechanical Energy into Electrical Energy
A) Mechanical Energy into Electrical Energy
B) Electrical Energy into Mechanical Energy
C) Both A&B
C) Both A&B
D) None of these
ANSWER:A
16. Efficiency means
A) Output Power /Input power
A) Output Power /Input power
B)Input Power/Output Power
C) Both A&B
C) Both A&B
D) None of these
ANSWER:A
17. Core Losses are
A) Hysteresis loss
A) Hysteresis loss
B) Eddy Current Loss
C) Both A&B
D) None of these
ANSWER:C
ELECTRICAL MACHINE 25 IMPORTANT MCQ
18. Copper Losses are
A) I2R Losess
A) I2R Losess
B) Constant Losess
C) Both A&B
D) None of these
ANSWER:A
19. Mechanical Losses are
A)core losses
B) Friction & Windage losses
C) Both A&B
C) Both A&B
D) None of these
ANSWER:B
20.External Resistance is observed in
A) Squirrel Cage Induction Motor
A) Squirrel Cage Induction Motor
B) Slip Ring Induction Motor
C) Both A&B
C) Both A&B
D) None of these
ANSWER:B
21. What is the synchronous speed when F=60Hz, P=6
A)1000 RPM
A)1000 RPM
B) 1100 RPM
C) 1200 RPM
D)1300RPM
ANSWER:C
ELECTRICAL MACHINE 25 IMPORTANT MCQ
22. What is slip when Ns=1200RPM , Nr=1000RPM
A)0.15
B)0.16
A)0.15
B)0.16
C)0.17
D) 0.18
ANSWER:B
23. What is the value of frequency when Ns=1000 RPM , P=6
A)30Hz
A)30Hz
B)40Hz
C)50Hz
D)60Hz
ANSWER:C
24. What is the value of Nr when S=0.6, Ns=1000RPM
A)400 RPM
A)400 RPM
B)500 RPM
C)600 RPM
D)700RPM
ANSWER:A
ELECTRICAL MACHINE 25 IMPORTANT MCQ
25. Slip When Nr=Ns
A)1
A)1
B)0
C)0.5
D)0.4
ANSWER:B
