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Electrical Machines

Electrical Machines
Maximum power developed depends on

 load angle
 both 1and 2
 voltage
 reactance

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Electrical Machines
The principle of dynamically induced emf is utilized in

 transformer.
 thermocouple.
 generator.
 choke.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 None of these.
 Compounded DC generator.
 DC series generator.

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Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 cos2δ
 sin2δ
 cosδ
 sinδ

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

 2.74 Ω.
 25.564 Ω.
 2.781 Ω.
  2.241 Ω.

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Electrical Machines
Stepper motor is used in

 food processing
 computer printers
 traction
All of these

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