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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 4/3.
 16/9.
 9/16.

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 2 and 1
 2 and 2
 4 ang 1
 4 and 2

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Electrical Machines
A shunt generator has a critical field resistance of 300 Ω at a speed of 800 rpm if the speed is raised to 1000 rpm the critical field resistance is

 145 Ω.
 225 Ω.
 150 Ω.
  375 Ω.

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Electrical Machines
Commonly used starters of cage motor is

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

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 500 VA
 550 VA
 100 VA
 110 VA

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Reluctance motors.
  Universal motors.
  Stepper motors.
  Induction motors.

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