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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 25° to 30°
 90°
 70° to 85°
 0°

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.96
 0.95
 0.87

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Electrical Machines
Which of the following statements are correct ?

 A small value of leakage reactance will increase the maximum power output of motor.
 Both 1 and 2.
 The leakage reactance of the induction motor should be small.
None of these

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 20 V.
 60 V.
 0 V.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 1
 0
 0.5

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Electrical Machines
Which type of motors are used for lathes?

 Either A or B.
 DC shunt motors.
 Synchronous motor.
 Cage induction motor.

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