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Electrical Machines

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

 either increase or decrease
 increase
None of these
 decrease

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Electrical Machines
Stepper motor is used in

 traction
All of these
 computer printers
 food processing

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Electrical Machines
Rotating part of DC motor is known as

 Pole.
 Carbone brush.
 Armature.
 Starter.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Capacitor start capacitor run motor
All of these
 Resistance split phase motor

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Electrical Machines
What is the highest possible speed of turbo alternators?

 1500 rpm
 3000 rpm
 4000 rpm
 1000 rpm

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 6 V
 474 V
 240 V

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