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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 hysteresis loss
 total iron losses
 copper loss
 eddy current loss

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Electrical Machines
Maximum power will be developed when back emf is

 equal to supply voltage.
All of these
 double the supply voltage.
 half of the supply voltage.

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

  Conveyers.
 Air compressors.
 Blowers.
 Centrifugal pumps.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.95
 0.87
 0.96

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4S
 PZL/ 4Sa
 PZL/4Sa²
 PZL/4Sp²

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 regulates its armature voltage.
 helps in energy conversion.
 aids applied voltage.

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