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Electrical Machines

Electrical Machines
Flux density under trailing pole tips in case of generator will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 1500 rpm
 750rpm
 zero speed
 1000 rpm

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque, operating speed, full load current.
 Starting torque.
 Operating speed.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 570 A.
 250 A.
 440 A.
 340 A.

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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

 0.95
 0.96
 1.06
 0.87

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Electrical Machines
In escalator which motor is used?

  3 - φ IM.
  1 - φ IM.
  Universal motor.
  DC shunt motor.

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