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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.4
 0.04
 0.02
 0.2

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 excitation and load angle
 supply voltage and excitation
 supply voltage and load angle
 supply voltage, load angle and excitation

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Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 torque.
 speed.
 current.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
  depends on the power factor of the load.
 is always lagging.
 is always unity.

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 approach zero.
 aprroach infinity.
 between zero and infinity.
 remain unchanged.

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Electrical Machines
The starting resistance of DC motor is generally

 Infinitely large.
 around 500 ohms.
  Low.
 1000 ohms.

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