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Electrical Machines

Electrical Machines
DC shunt motors are suitable for

 Blowers and fans.
 Lathes.
 Centrifugal pumps
  All of this.

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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?

 940 rpm
 975 rpm
 1000 rpm
 950 rpm

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
 450 rpm.
  240 rpm.
 540 rpm.

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 16KVA
 4KVA
 0KVA
 20KVA

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 10%
 41%
 21%
 11%

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Electrical Machines
For standing a DC motor a starter is required because

  It starts the motor.
  it limits the starting current to a safe value.
  it limits the speed of the motor.
None of these

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MORE MCQ ON Electrical Machines

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