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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 cast iron.
 mica.
  carbon.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 123.3 KVA
 83.33 KVA
 100 KVA
 50 KVA

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 high starting torque.
  zero starting torque.
 starting torque equal to full-load torque.

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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?

 45 HZ
 50 Hz
 48.5 Hz
 48 Hz

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Electrical Machines
From no load to full load the slip will

 slightly increase.
 slightly decrease.
None of these
 not change.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 50 V.
  zero.
  220 V.
  about 2 V.

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