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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is
5%
4%
25%
2%
5%
4%
25%
2%
Answer
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Related Question
Electrical Machines
The heat transfer by convection in a transformer least depends on
surface area.
air velocity.
color of the paint.
temperature difference.
surface area.
air velocity.
color of the paint.
temperature difference.
Answer
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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load
remains unaffected
increases
None of these
decreases
remains unaffected
increases
None of these
decreases
Answer
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Electrical Machines
The following statements relate to compensating winding (CW) and interpole winding (IW) of a dc machine : 1. CW neutralizes the armature reaction under a pole pitch 2. IW is connected in series with armature circuit 3. IW produces mmf in the commutating zone only 4. CWmmf is directed along the brush axis 5. Mmf produced by IW is equal to armature mmf From these, the correct statements are
1, 2, 3, 4 and 5
2, 3, 4, 5
1, 3, 4, 5
2, 3, 4
1, 2, 3, 4 and 5
2, 3, 4, 5
1, 3, 4, 5
2, 3, 4
Answer
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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?
same prime mover speed
same voltage magnitude
same frequency
same phase sequence
same prime mover speed
same voltage magnitude
same frequency
same phase sequence
Answer
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Electrical Machines
Flashing the field of DC generator means
increasing flux density by adding extra turns of winding.
creating residual magnetism by a DC source.
making the magnetic losses forces parallel.
neutralising residual magnetism.
increasing flux density by adding extra turns of winding.
creating residual magnetism by a DC source.
making the magnetic losses forces parallel.
neutralising residual magnetism.
Answer
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