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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  all of below.
  less cost.
  simple in construction.
  less maintenance.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  1440 to 2880.
  720 to 920.
  500 to 720.

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  over compounded.
  shunt.
  under-compounded.
  differential compounded.

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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?

 48 Hz
 50 Hz
 48.5 Hz
 45 HZ

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

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Electrical Machines
Counter emf of a DC motor

 exceeds supply voltage
 helps in energy conversion.
 aids applied voltage.
 regulates its armature voltage.

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