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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  low.
  medium.
  high.
  zero.

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Electrical Machines
A 4 pole dynamo with wave wound armature has 51 slots contains 20 conductors in each slot. If induced emf 357 Volts and speed is 8500 rpm, flux per pole will be

  1.2 mWb.
 3.5 mWb.
 2.7 mWb.
 1.4 mWb.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 400W
 250 W
 500 W
 300 W

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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that

 both Eb and Td are unchanged
 Eb is unchanged, but Td is zero
 Eb is zero, but Td is unchanged
 both Eb and Td are zero

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Low.
  High.
  Equal to 1.
  Same as full load.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 50 Hz
 45 HZ
 48 Hz
 48.5 Hz

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