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Electrical Machines

Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 increases.
None of these
 decreases.
 remains same.

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Electrical Machines
There are two 2-pole DC machines. Main field axis of machine A is horizontal and that of B is vertical. It is preferable to purchase

 none of these
 any of the two machines
 machine A
 machine B

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, - 50 rpm.
 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, 950 rpm.

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Electrical Machines
The ventilating ducts in most of DC machine are

 longitudinal.
 radial as well as longitudinal.
 none of these.
 radial.

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Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 9/16.
 3/4.
 16/9.
 4/3.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  no resistance is connected.
  parallel.
  series.
  any one of the connection.

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