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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

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

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 decrease.
 None of above.
 not change.
 increase.

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 none of these.
 AC to DC.
 high voltage DC to low voltage DC.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

 0.01 pu.
  0.08 pu.
  0.02 pu.
 0.16 pu.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 3.1 Ω
 1.8 9 Ω
 1.79 Ω

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 8 Ω.
  2 Ω.
 10 Ω.
  4 Ω.

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