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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.4
 0.02
 0.2

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

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

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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance

 100Ω
 10Ω
 200Ω
 50Ω

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
 reactance voltage produced due to communication.
 the use drum winding.
  the use equalizer in lap winding.

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Electrical Machines
Lap winding is prefered for which type of machines?

 high current and high voltage
 low current and low voltage
 low current and high voltage
 high current and low voltage

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.8 9 Ω
 1.79 Ω
 3.1 Ω
 2 .1 Ω

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