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Electrical Machines

Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 increases.
 decreases
 remains constant.
 decreases.

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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

 6 V
 less than 6 V
 zero
 more than 6 V

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self induction.
  self or mutual induction.
  electromagnetic induction.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
 cooling the armature.
  reducing the load voltage.
  increasing the excitation.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 5.7 kW, 8.7 kW.
 9.3 kW, 9.3 kW.
  6.3 kW, 9.3 kW.
 9.6 kW, 12 kW.

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Electrical Machines
Generators work on the principle of production of

 statically induced emf.
None of these
 dynamically induced emf.
 dynamically and statically induced emf.

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