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Electrical Machines

Electrical Machines
Belt conveyors offer _______________ starting torque.

  zero.
  medium.
  high.
  low.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Remain unaltered.
 Reduce.
 Oscillate around the normal speed.
 Increase.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Compound Wound DC Motor
 DC Series Motor
 Separately Excited DC Motor
 DC Shunt Motor

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 decrease
 increase gradually and then stay at rated voltage
 increase to rated voltage and then may decrease
 remain nearly constant

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 8 KW.
 10 KW.
 0.

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.
 field current on Y-axis and armature current on X-axis.
 either of these.

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