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Electrical Machines

Electrical Machines
The starting resistance of DC motor is generally

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

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Slip ring induction motor.
 Same in both induction motors.
None of these
 Squirrel cage induction motor.

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Electrical Machines
In an ideal DC generator the regulation is

 low.
 high.
 zero.
 positive.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 25 ppm.
  35 ppm.
 45 ppm.
 20 ppm.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  ratio of input to output voltage.
  ratio of starting to running current.
  efficiency.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  negative sequence current.
  all of these.
  less heating of the rotor.

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MORE MCQ ON Electrical Machines

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