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Machines page-10  Multiple Choice Question (MCQ) of D.C. Machines page-9  Multiple Choice Question (MCQ) of D.C. Machines page-8  Multiple Choice Question (MCQ) of D.C. Machines page-7  Multiple Choice Question (MCQ) of D.C. Machines page-6  Multiple Choice Question (MCQ) of D.C. Machines page-5  Multiple Choice Question (MCQ) of D.C. Machines page-4  Multiple Choice Question (MCQ) of D.C. Machines page-3  Multiple Choice Question (MCQ) of D.C. Machines page-2  Multiple Choice Question (MCQ) of D.C. Machines page-1  MCQ of D.C generators page-11  MCQ of D.C generators page-10  MCQ of D.C generators page-9  MCQ of D.C generators page-8  MCQ of D.C generators page-7  MCQ of D.C generators page-6  MCQ of D.C generators page-5

Index

SymbolsTransformerRelayPower-SystemBasic-electricalACSR-ConductorCircuit-BreakerInterview-questions-of-Basic-ElectricityInterview-questions-of-transformerInsulatorCurrent-TransformerMCQMCQ-powersystemThermal-power-stationInterview-questions-of-Power-SystemPower-ElectronicsInterview-questions-of-Underground-CableInterview-questions-of-IlluminationIlluminationMCQ-of-ElectronicsMCQ-of-Basic-ElectricalMCQ-of-Transformers MCQ-of-D.C-motor MCQ-of-D.C-generators

Multiple Choice Question (MCQ) of Induction Motors page-3

21. The disadvantage of starting an induction motor with a star-delta starter is that

a) The starting torque is one-third of the torque in case of delta connection
b) During starting high losses result
c) The starting torque increases and the motor runs with jerks
d) None of these

Ans: (a)

22. Squirrel cage induction motor has

a) Zero starting torque
b) Very small starting torque
c) Medium starting torque
d) Very high starting torque

Ans: (b)

23. Improvement of the power factor in an induction motor results in

a) Decreased torque
b) Increased torque
c) Increased torque current
d) Increased torque and decreased current due to increased impedance

Ans: (d)

24. The purpose of blades in a squirrel cage induction motor is

a) To reduce the magnetic resistance of the rotor
b) To cool the rotor
c) To reduce the electrical resistance of rotor cage
d) None of these

Ans: (b)

25. Which of the following function is served by the resistance placed in parallel with one phase of three-phase induction motor?

a) Smooth starting
b) Higher starting torque
c) Higher maximum torque
d) Higher reduced starting torque

Ans: (a)

26. Which of the following is the advantage of double squirrel cage rotor as compared to the round bar cage rotor?

a) Large slip
b) Lower starting torque
c) Higher power factor
d) Higher efficiency

Ans: (b)

27. The rotor output of an induction motor is 15 kW and the slip is 4%. Then the rotor copper loss is

a) 600 watts
b) 300 watts
c) 700 watts
d) 1200 watts

Ans: (a)

28. On open circuiting the rotor of a squirrel cage induction motor, the rotor

a) Makes noise
b) Does not run
c) Does not run
d) Runs at dangerously high speed

Ans: (c)

29. Number of different speed that can be obtained from two induction motors in cascade is

a) 6
b) 4
c) 3
d) 2

Ans: (b)

30. The drawback of speed control of a slip ring induction motor with the help of resistance in the circuit is that

a) It is applicable only to motors having power of more than 100 kW
b) It results in high losses
c) With reduction in speed, the torque decreases significantly
d) The speed can be controlled only very broadly

Ans: (b)

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