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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  medium.
  low.
  high.
  zero.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature connections.
 armature or field connections.
 shunt field connections.
 series field connections.

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Electrical Machines
When pure inductive load is connected to the alternator, what is the effect of armature reaction?

 Magnetization
None of these
 Cross magnetization
 Demagnetization

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 57.1%.
 48.0%.
 88.8%.
 59.2%.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 low current and low voltage
 low current and high voltage
 high current and low voltage
 high current and high voltage

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
 differentially compounded.
  shunt connected.
  cumulatively compounded.

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