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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 20°
 60°
 30°
 18°

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Electrical Machines
For larger units high torque it is preferred to use

 Partial motor.
 Universal motor.
 Slip induction motor.
 DC shunt motor.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 transformer.
 generator.
 choke.

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Electrical Machines
Maximum power developed depends on

 reactance
 both 1and 2
 voltage
 load angle

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Electrical Machines
In DC generators, the cause of rapid brush wear may be

 any of above.
 imperfect contact.
 severe sparking.
 rough commutator surface.

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Electrical Machines
Which of the following generators are used in arc welding?

 differential compound generators
 series generators
 shunt generators
 cumulative compound generators

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