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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 V²
 V
 f²
 f

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 machine will generate maximum power.
 machine will generate maximum voltage.
 field winding will burn.
 the voltage generated will be zero.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 8
 4
 1

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Electrical Machines
Direct axis reactance is defined as the ratio of

 Vmax to Imax
 Vmax to Imin
 Vmin to Imax
 Vmin to Imin

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 500.
 2000.
 0.

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Electrical Machines
Universal motors are used in

All of these
 food processing
 cranes
 traction

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