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Electrical Machines

Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 100
 1

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

  Conveyers.
 Blowers.
 Centrifugal pumps.
 Air compressors.

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

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

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 1/√5
 1/3
 1/√2
 2/√5

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KVA.
 Output power at the shaft.
 Power drawn in KW.

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Electrical Machines
The teeth in the armature of a DC machines are sometimes skewed. This is done to reduce

 hysteresis loss.
 eddy electric current loss.
 vibrations.
 copper loss.

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