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Three Phase Induction Motors

Three Phase Induction Motors
The efficiency of an induction motor can be expected to be nearly

60 to 90%
80 to 90%
99%
95 to 98 %

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Three Phase Induction Motors
A wound rotor motor is mainly used in applications where ______

Less costly motor is not required
Speed control is required
High starting torque is required
High rotor resistance is required during running

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

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

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Three Phase Induction Motors
In an induction motor the relationship between stator slots and rotor slots is that

Stator slots are equal to rotor slots
Stator slots are exact multiple of rotor slots
Stator slots are not exact multiple of rotor slots
None of the listed here

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Three Phase Induction Motors
If the rotor slots are made deeper, rotor resistance is ______

Decreased at starting
None of the listed here
Increased at starting
Increased under running conditions

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Three Phase Induction Motors
The synchronous speed of a 3-phase induction motor having 20 poles and connected to a 50 Hz source is _____

300 rpm
1000 rpm
600 rpm
1200 rpm

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