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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 AC generator
 DC generator
 induction motor
 DC motor

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

  more than core loss.
 zero.
 equal to core loss.
 less than core loss.

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

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

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

  lagging.
 zero.
 leading.
 unity.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

  40 V.
 0 V.
 60 V.
 20 V.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 alternating electric flux.
 constant magnetic flux.
 alternating magnetic lux.

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MORE MCQ ON Electrical Machines

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