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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be
15.28 Nm
15.6 Nm
15.92 Nm
16.55 Nm
15.28 Nm
15.6 Nm
15.92 Nm
16.55 Nm
Answer
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Related Question
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The synchronous motor can be started by
providing damper winding in its rotor circuit.
coupling it with a small AC induction motor called the pony motor.
any of the above methods.
coupling it with a DC compound motor.
providing damper winding in its rotor circuit.
coupling it with a small AC induction motor called the pony motor.
any of the above methods.
coupling it with a DC compound motor.
Answer
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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings
V, I and P
V, I/2 and P/2
V/2, I and P/2
V/2, I/2 and P/4
V, I and P
V, I/2 and P/2
V/2, I and P/2
V/2, I/2 and P/4
Answer
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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?
Same as full load.
Low.
High.
Equal to 1.
Same as full load.
Low.
High.
Equal to 1.
Answer
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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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Electrical Machines
Which of the following transformer insulating oil generally used in India?
Naphtha based insulating oil.
Aromatics based insulating oil.
Paraffin based insulating oil.
Olefin based insulating oil.
Naphtha based insulating oil.
Aromatics based insulating oil.
Paraffin based insulating oil.
Olefin based insulating oil.
Answer
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