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Electrical Machines

Electrical Machines
Stepper motor is used in

 computer printers
 traction
 food processing
All of these

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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?

 950 rpm
 975 rpm
 1000 rpm
 940 rpm

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  reversed.
  modified.
  none of these.

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Electrical Machines
Neglecting all losses, the developed torque (T) of DC separately excited motor, operating under constant terminal voltage is reduced to its output power (P) as

 T ∝ P.
 T2 ∝ P3.
 T ∝ √P.
 T is independent of P.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 60, 1440.
 1440, 1500.
 50, 1500.

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 16.55 Nm
 Zero
 15.28 Nm
 15.6 Nm

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