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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
None of these
 decrease
 not changed

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Electrical Machines
Universal motors are used in

 traction
 food processing
 cranes
All of these

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 200%
 increase by 100%
 remain unaltered
 reduced to half

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Electrical Machines
Counter emf of a DC motor

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

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Electrical Machines
A cumulatively compounded dc motor delivers rated load power at rated speed. If the series field is short-circuited, then

 Ia remains constant but ωm increase
 Ia increases and ωm decreses
 both armature current Ia and speed ωm increase
 both decrese

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

  Conveyers.
 Blowers.
 Air compressors.
 Centrifugal pumps.

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MORE MCQ ON Electrical Machines

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