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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

None of these
 DC shunt motors.
 DC compound motors.
 DC series motors.

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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
 768 V
 96 V
 384 V

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P²
 T is independent of P
 T∝ P³
 T∝ P

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Remains unchanged.
  Increases.
 None of above.
 Decreases.

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Electrical Machines
The polarity of a DC generator can be reversed by

 reversing field electric current as well as direction of rotation.
 any of above.
 increasing field current.
 reversing the field current.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 60W
 100W
 40W
 80W

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