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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 induction motor
 DC generator
 AC generator
 DC motor

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 All of the them
 Hysteresis losses
 Eddy current losses

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

 0.2
 0.4
 0.04
 0.02

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in series with the shunt field
 in series with the series field
 in parallel with the shunt field
 in parallel with the series field

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Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 either increase or decrease
 decrease
 increase

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Electrical Machines
A DC Motor is driving a constant load torque having armature resistance of 0.25 Ω and armature current of 60 A having connected to a voltage of 230 V. Now a resistance of 1 ohm is added into the armature circuit. The ratio of their speed will be

 0.72.
 0.25.
 0.62.
 1.24.

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