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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
  DOL.
None of these

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

 increases.
 remains same.
 decreases.
None of these

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the series field
 in series with the series field
 in series with the shunt field
 in parallel with the shunt field

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Electrical Machines
Minimum allowable resistivity of power transformer insulating oil is generally taken as

  1 X 1012 Ω - cm at 27°C and 0.1 X 1012
 4 X 1012 Ω - cm at 27°C and 0.4 X 1012
 3 X 1012 Ω - cm at 27°C and 0.3 X 1012
 2 X 1012 Ω - cm at 27°C and 0.2 X 1012

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 all of above.
 high maintenance cost.
 poor overall efficiency.
 high initial cost.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  ohmic losses.
  eddy current losses.
  hysteresis losses.
  mechanical losses.

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