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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 50 Ω
 100 Ω
 10 Ω

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Electrical Machines
What is the reason for stationary armature essential in alternators above 5 KVA?

 Operating cost is less.
 Collecting of large current is simple.
 Insulation requirement is less.
All of these

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Electrical Machines
Poles of DC machine are often laminated to

 reduce armature reaction.
 dissipate more heat.
 reduce iron weight.
 reduce pulsation loss.

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Electrical Machines
Slip rings of an induction motors are made of

  carbon.
  phosphor bronze.
  aluminium.
  stainless steel.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 14%.
  8.9%.
 7%.
 0%.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 All of these.
 Applied voltage.
 Field flux.

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