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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 DC machine
All of these
 Induction machine

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Electrical Machines
Synchronous reactance of an alternator represents

 field winding reactance
 a reactance operating at synchronous speed
All of these
 armature reactance and leakage reactance

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Electrical Machines
Damper winding is used to

 decrease the load current.
 increase the load current.
 both 1 and 2.
 suppress the hunting.

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
None of these
 rotor resistance R
 rotor reactance X

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Electrical Machines
The DC generator runs at a speed of 1000 rpm and flux per pole is 0.2 Wb, number of poles are 2 the winding is wave wound and having 480 conductors. The critical speed is 1200 rpm. Then the generated emf ( Eg )

 1500 Volt.
 2000 Volt.
 1600 Volt.
  0 Volt.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 generator armature terminal.
 generator field terminal.
 motor armature terminal.

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