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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.9 lag
 0.2 lag
 0.2 lead
 unity

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

  A - C - B.
 B - C - A.
 B - C - A or C - A - B.
 C - A - B.

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Electrical Machines
The armature shaft must be able to withstand

All of these
 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.
 any unbalanced magnetic pull on the armature core.

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Electrical Machines
A crusher is equipped with

 Slip ring induction motor.
 Synchronous motor.
 Reluctance motor.
 DC shunt motor.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 0 KVA
 10 KVA
 6 KVA
 4 KVA

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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is

 Proportional to the square of armature current.
 Inversely proportional to the armature current.
 None of above.
 Proportional to the armature current.

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