Computer Programming MCQs

5739 MCQs (Page 62 of 574)

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For which motor the speed can be controlled from rotor side ?

A. Squirrel-cage induction motor
B. Slip-ring induction motor
C. Both a. and (b)
D. None of the above

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Rotor rheostat control method of speed control is used for____________?

A. Squirrel-cage induction motors only
B. Slip ring induction motors only
C. Both a. and (b)
D. None of the above

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If any two phases for an induction motor are interchanged_______?

A. The motor will run in reverse direction
B. The motor will run at reduced speed
C. The motor will not run
D. The motor will burn

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An induction motor is__________?

A. Self-starting with zero torque
B. Self-starting with high torque
C. Self-starting with low torque
D. Non-self starting

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The maximum torque in an induction motor depends on___________?

A. Frequency
B. Rotor inductive reactance
C. Square of supply voltage
D. All of the above

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In three-phase squirrel-cage induction motors____________?

A. Rotor conductor ends are short-circuited through slip rings
B. Rotor conductors are short-circuited through end rings
C. Rotor conductors are kept open
D. Rotor conductors are connected to insulation

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In a three-phase induction motor, the number of poles in the rotor winding is always__________?

A. Zero
B. More than the number of poles in stator
C. Less than number of poles in stator
D. Equal to number of poles in stator

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DOL starting of induction motors is usually restricted to_____________?

A. Low horsepower motors
B. Variable speed motors
C. High horsepower motors
D. High speed motors

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The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?

A. Changing supply frequency
B. Changing number of poles
C. Changing winding resistance
D. Reducing supply voltage

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The ‘crawling” in an induction motor is caused by___________?

A. High loads
B. Low voltage supply
C. Improper design of machine
D. Harmonics developed in the motor

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