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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 40 A.
 400 A.
 440 A.
 44 A.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature circuit resistance control.
 Field resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
If the excitation is increased, the power factor is

 unity power factor
None of these
 leading power factor
 lagging power factor

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to two phase transformation.
 three phase to single phase transformation.
 any of the above.

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Electrical Machines
Which of the following will vary the maximum torque?

None of these
 rotor resistance R
 both 1 and 2
 rotor reactance X

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 0
 3 or 4
 2
 1

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