ELECTRICAL MACHINE QUIZ

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ELECTRICAL MACHINE QUIZ_30

1-PHASE I.M MOTOR_1

Q.01 A single phase induction motors are

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Option 1

comparatively cheaper and reliable

easy to repairs and maintenance

all of the above

Clear selection

Q.02 A single phase motor can be classified as

1 point

commutator motor

induction motor

synchronous motor

all of the above

Clear selection

Q.03 what are the drawback of single phase induction motors?

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low output as compared to 3-phase motor

low power factor and low efficiency

low overload capacity as compared to 3-phase motor

all of the above

Clear selection

Q.04 A 3-phase induction motor has becomes a single phase when

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opening of one line or phase

opening of two line or phase

it operated only on one line supply

any of the above

Clear selection

Q.05 In 3-phase induction motors, if one of the line of three phase supply is opened

1 point

motor continue to run at same speed

motor continue to run at slightly lower speed

motor will stop

motor will continue to rum more than rated speed

Clear selection

Q.06 A single phase induction motor consists of

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two winding

three winding

only one winding

four winding

Clear selection

Q.07 In single phase induction motors, there are two windings namely____

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starting winding or auxiliary winding

main winding or running winding

Both B and C

neutral and phase winding

Clear selection

Q.08 In single phase induction motors the main winding is placed at the ____ and the starting winding is placed at the ___.

1 point

bottom of the stator slots; on the top of the stator slots

on top of the stator slots; bottom of the stator slots

both are at the bottom of the stator slots

both are on the top of the stator slots

Clear selection

Q.09 In single phase induction motor the main winding is shifted _____ from auxiliary winding.

1 point

45°

90°

180°

120°

Clear selection

Q.10 Which of the following is not self start motors?

1 point

3-phase induction motor

dc motors

single phase motor

reluctance motor

Clear selection

Q.11 In single phase induction motors

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the axis of rotor mmf wave coincides with that of the stator field

at starting torque angle is zero

no torque is developed at starting

all of the above

Clear selection

Q.12 Under stationary condition of single phase motor the slip is

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zero

one

negative

none of the above

Clear selection

Q.13 In double field revolving field theory of single phase motors

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Two rotating field of same strength

develop equal and opposite electromagnetic torques

resultant net torque at starting is zero value

all of the above

Clear selection

Q.14 If a single phase induction motors, at starting it is started by some external means then

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the motor will start running

the motor will not start

the motor will started with very high speed

the motor will burns

Clear selection

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