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Electrical Machines

Electrical Machines
A DC generator beyond critical resistance will generate

 no voltage.
 maximum current.
 maximum power.
 maximum voltage.

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Electrical Machines
Two identical loss less series motors connected in series across a dc supply voltage, runs at speed of N1 and N2, then ratio of their output power is

 1 : 1.
 N12 : N22.
 none.
 N1 : N2.

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Electrical Machines
Which of following methods are suitable for the speed control of squirrel cage induction motor? 1. Voltage control. 2. Frequency control. 3. Pole changing method. 4. Rotor resistance control select the correct answer using the codes given below:-

  1, 2 and 3.
 2, 3 and 4.
 1, 3 and 4.
 2 and 4.

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Electrical Machines
A series motor is efficiently suitable for

 low starting torque operation.
 constant speed operation.
 none of these.
  high starting torque operation.

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Electrical Machines
When a DC cummulative compound wound motor is loaded

  Torque increase and speed decrease.
 Both torque and speed decrease.
 Torque decrease and speed increases.
 Torque and speed both increase.

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

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

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