ELECTRICAL MACHINE QUIZ

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ELECTRICAL MACHINE QUIZ_46

SHADED POLE I.M MOTOR

Q.61 The flux in the shaded pole of the motor is ____ the flux in the main part of the pole.

1 point

leads

in phase

lagging behinds

out of phase

Clear selection

Q.62 The flux in shaded pole and the main pole flux are displaced by___ in shaded pole motor.

1 point

less than 90°

more than 90°

90°

more than 45° and less than 90°

Clear selection

Q.63 If the current in the excitation winding coil is increases a voltage is induced in the shading coil is by action of ___

1 point

motoring action

transformer action

generating action

none of the above

Clear selection

Q.64 The current in the _____ shading coil is comparatively __.

1 point

high resistance; low

low resistance; low

low resistance; high

high resistance; high

Clear selection

Q.65 In shaded pole motor, when the exciting current and flux attains their maximum values the rate of change in flux is

1 point

maximum

zero

minimum

does not changed

Clear selection

Q.66 If excitation current increases in shaded pole motor the

1 point

greater portion of flux passes through the un-shaded part of each pole

resultant flux is lies near the center of the un-shaded part of the pole

greater portion of flux passes through the shaded part of each pole

Both A and B

Clear selection

Q.67 If the excitation current and flux decreases in shaded pole induction motor the induced emf and current in the shading coil sets up a mmf is___

1 point

aids the stator field

retard the stator field

aids the rotor field

retard the rotor field

Clear selection

Q.68 Why field flux is shift across the pole face from the un-shaded portion to shaded portion in shaded pole induction motor?

1 point

because of damper winding

because of shading coil

because of compensating winding

because of auxiliary winding

Clear selection

Q.69 In shaded pole motor the direction of rotating flux is from

1 point

haded pole to un-shaded pole

unshaded pole to shaded pole

depends on polarity of supply mains

none of the above

Clear selection

Q.70 A shaded pole motor

1 point

starting torque is very small about 40 to 80 percentage of full load torque

The efficiency range is from 20 to 50 per cent

power factor is very poor ranging from 0.5 to 0.6

all of the above

Clear selection

Q.71 In shaded pole motor the direction rotation of motor is depends on the

1 point

position of shading coil

magnitude of excitation current

polarity of the supply mains

all of the above

Clear selection

Q.72 The speed of the shaded pole motor can be varied by

1 point

varying the voltage applied across its rotor winding

varying the voltage applied across its stator winding

varying the number of shaded ring

varying the excitation

Clear selection

Q.73 Why shaded pole motor is suitable for low power applications?

1 point

because of low power factor

because of poor starting torque

because of poor efficiency

all of the above

Clear selection

Q.74 The voltage applied to shaded pole motor can be varied

1 point

by using a tapped reactance coil

by using an auto-transformer

by using tapped exciting winding

all of the above

Clear selection

Q.75 A shaded pole motor is suitable for the applications of

1 point

small fans, photocopying machine

advertising display, slide projectors, time phonographs

humidifiers, electric clocks

all of the above

Clear selection

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