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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
None of these
 rotor reactance X
 rotor resistance R

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Electrical Machines
Rotor resistance speed control is used in

 dc shunt motor.
 squirrel cage induction motor.
 synchronous motor.
 slip ring induction motor.

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  1 - φ IM.
  DC shunt motor.
  Universal motor.

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Electrical Machines
In a transformer, hysteresis and eddy current losses depend upon

 supply frequency
 both 2 and 3
 load current
 maximum flux density

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 increase and decrease respectively
 both decrease
 decrease and increase respectively
 both increase

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC compound motor.
 DC series motor.
 DC Shunt motor.

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