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Electrical Machines

Electrical Machines
If a DC Series motor is connected across an AC supply it will

 run at normal speed.
 run at lower speed.
 burn.
 not run.

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Electrical Machines
Two DC series motors are connected in series and are driving the same mechanical load. If the motors are now connected in parallel the speed will become

 half.
 double.
 4 times.
 one fourth.

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
 rotor reactance X
None of these
 rotor resistance R

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Auxiliary winding.
 Compensating winding.
 Commutating pole winding.
 Both Compensating and Commutating pole winding.

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Electrical Machines
Wave winding is prefered for which of the following rating?

 high current and high voltage
 low current and high voltage
 low current and low voltage
 high current and low voltage

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 133.22 N-m
 266.20 N-m.
 can not be determined.
 234.76 N-m.

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