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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 low and low
 high and low

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Electrical Machines
If the field circuit of a DC shunt motor is opened

  The motor will attain dangerously high speed.
 The speed of motor will be reduced.
 DC Shunt Motor
 The armature current will reduce.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with increase in the load torque.
 decreases with decrease in the load torque.
 increases with increase in the load torque.
 remains constant.

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Electrical Machines
Maximum power developed by a synchronous motor depends on

 supply voltage and excitation
 supply voltage, load angle and excitation
 supply voltage and load angle
 excitation and load angle

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

  reactance voltage.
None of these
  dynamically induced voltage.
  statically induced voltage.

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 less than that of second transformer.
  more than that of second transformer.
 equal to that of second transformer.
 none of these.

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