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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 115 V.
 460 V.
 230 V.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 30 rpm
 1470 rpm
 zero
 1500 rpm

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
 DC shunt motor.
  DC series motor.
  DC series generator.

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Electrical Machines
What type of connection is made in between the inter-pole and the field winding?

 Compound.
 Parallel.
  Series.
 None of the options.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable load.
  variable supply voltage.
  variable frequency.
  windage friction.

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Electrical Machines
A 240 V DC series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 ohms. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 2.2 ohms.
 1.9 ohms.
 5.7 ohms.
 6 ohms.

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