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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 None of these.
 No load.
  Full load.
 Low load.

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Electrical Machines
A separately-excited DC generator, running at rated speed, has 6 volts across its armature terminals with no field current. When field winding is excited with one ampere, the voltage builds up to 250 V at no load. In case field current is reduced to zero, with the speed remaining unaltered, the armature terminal voltage would be

 less than 6 V
 zero
 more than 6 V
 6 V

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  720 to 920.
  375 to 500.
  500 to 720.
  1440 to 2880.

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Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 below rated speed
None of these
 above rated speed

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 lagging power factor.
 leading power factor.
 unity power factor.
None of these

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Electrical Machines
High inrush of current during a starting of DC motor can efficiently be restricted to a safer value by increasing the _________________ resistance.

 shunt field
 both A and B
 none of above
 armature circuit

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