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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 rectangular
 flat-topped
 co- sinusoidal

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Electrical Machines
A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction?

  100.
 750.
 200.
 500.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 synchronous speed.
 any of the above.
 slip speed.

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Electrical Machines
Which of the following statements are correct ?

None of these
 The leakage reactance of the induction motor should be small.
 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply frequency
 supply voltage
 rotor resistance

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Electrical Machines
The polarity of a DC generator can be reversed by

 any of above.
 increasing field current.
 reversing field electric current as well as direction of rotation.
 reversing the field current.

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