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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 400 A.
 40 A.
 440 A.
 44 A.

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Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 19%
 40%
 10%
 5%

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.6 kW, 12 kW.
 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.
  6.3 kW, 9.3 kW.

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Electrical Machines
Dynamic braking can be used for

 compound motors.
 series motors.
All of these
 shunt motors.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 1
 2
 0

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
All of these
 RBY
 BYR

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