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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.04
 0.02
 0.4
 0.2

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 850 rpm
 950 rpm
 900 rpm
 1000 rpm

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Electrical Machines
The self induced emf in the coil undergoing commutation is called the

None of these
  statically induced voltage.
  reactance voltage.
  dynamically induced voltage.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 45 HZ
 50 Hz
 48 Hz
 48.5 Hz

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

 Synchronous machine
 DC machine
 Induction machine
All of these

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

 Starting torque.
  Full load current.
 Operating speed.
 Starting torque, operating speed, full load current.

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