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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/2.
 PN/120.
 PN/60.
 PN/3000.

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

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 500.
 0.
 1000.
 2000.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 266.20 N-m.
 cant be determined.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC series motor.
 DC compound motor.
 DC Shunt motor.
 Synchronous motor.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  zero.
  less than 1 %.
 1.5 %.

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