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Electrical Machines

Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 2KW
 1.5KW
 0.5Kw
 3KW

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
 to achieve a stronger magnetic field.
All of these
 to avoid over heating.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Shunt motor
 Series motor
 Differential compound motor
 Cumulative compound motors

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 ZPF method
 MMf method
 American standard association method
 Synchronous impedance method

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P²
 T∝ P³
 T∝ P
 T is independent of P

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Electrical Machines
Maximum power will be developed when back emf is

All of these
 equal to supply voltage.
 double the supply voltage.
 half of the supply voltage.

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