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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

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

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Electrical Machines
On what factors the speed of dc motor depends?

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

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Electrical Machines
In a DC generator if field winding attains the critical resistance

 the voltage generated will be zero.
 field winding will burn.
 machine will generate maximum power.
 machine will generate maximum voltage.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage and load
 supply voltage
 supply voltage, frequency and load

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Electrical Machines
Hunting in a synchronous cannot be due to

  windage friction.
  variable supply voltage.
  variable frequency.
  variable load.

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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

  8.9%.
 7%.
 0%.
 14%.

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