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Three Phase Induction Motors

Three Phase Induction Motors
One of the speeds of a 2 speed squirrel cage induction motor is 800 rpm. The other speed will be _____

1200 rpm
2400 rpm
400 rpm
1600 rpm

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Three Phase Induction Motors
The no load speed of an induction motor depends on

Both supply frequency and number of poles
The number of its poles
The maximum flux/poles
The supply frequency

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Three Phase Induction Motors
In an induction motor, the ratio of rotor cu loss and rotor input is given by

S/1-S
S
1-S
1/S

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Three Phase Induction Motors
Very large 3-phase induction motors (greater than 25 HP) are started _____

Direct on line
Star-delta starting
None of the listed here
By auto transformer starting

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Three Phase Induction Motors
The number of slip rings on a squirrel cage induction motor is usually

Two
One
Three
None

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Three Phase Induction Motors
The magnetising current drawn by a 3 phase induction motor is about _______ of full load stator current.

30 to 50%
5%
15 to 20 %
10 to 15%

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