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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 low and high
 high and low
 high and high

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 900 rpm
 950 rpm
 1000 rpm
 850 rpm

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Electrical Machines
A shaded pole single phase induction motor can be used for

 personal computers as cooling fan
 tape recorders
 food mixers
 wet grinders

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 2 at 90°C.
  1 at 90°C.
 3 at 90°C.
 0.5 at 90°C.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 192 V
 384 V
 768 V
 96 V

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 Stepper motor.
  1 - Φ synchronous motor.
 DC motor.
 3 - Φ induction motor.

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