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Three Phase Induction Motors

Three Phase Induction Motors
The complete circle diagram of induction motor can be drawn with the help of data found from

No-load test
All of these
Blocked rotor test
Stator resistance test

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

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

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Three Phase Induction Motors
The reactance of the rotor circuit of a 3-phase induction motor is maximum at

No load
Half full load
Full load
Starting

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Three Phase Induction Motors
The condition of induction motor at stand still resemble those of a transformer whose secondady is _______

Supplying a variable resistive load
Short circuited
Open circuited
None of the listed here

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Three Phase Induction Motors
If a 3-phase induction motor is running at slip S, then rotor copper loss is equal to

S × rotor input
None of the listed here
(1+S) × rotor input
(1-S) × rotor input

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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%
10 to 15%
15 to 20 %

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