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Single Phase Motors

Single Phase Motors
The electric motor used in portable drills is

Universal motor
Hysteresis motor
Capacitor run motor
Repulsion motor

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Single Phase Motors
Which of the following applications would need the smallest size of motor?

Table fan
Electric clock
Domestic mixi
Sewing machine

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Single Phase Motors
A shaded pole does not posses

Commutator
Centrifugal switch
Capacitor
All of the listed here

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Single Phase Motors
Which of the following applications always have some load whenever switched on?

Vaccum cleaners
Piston drills
Fan motors
All of the listed here

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Single Phase Motors
A capacitor-start single phase induction motor is switched on to supply with its capa-citor replaced by an inductor of equivalent reactance value. It will

start and run at rated speed
start and run slowly
not start at all
start and then stop

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Single Phase Motors
Most of the troubles of single phase induction motors are traceable to the _______

Shaft bearings
Main winding
Rotor bars
Starting switch

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