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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for
generation of voltage.
commutation.
electromechanical energy conversion.
development of torque.
generation of voltage.
commutation.
electromechanical energy conversion.
development of torque.
Answer
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Related Question
Electrical Machines
In most condition which frame of motor will be preferred?
Open type.
Splash proof.
Totally enclosed fan coiled.
Drip proof.
Open type.
Splash proof.
Totally enclosed fan coiled.
Drip proof.
Answer
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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?
Field resistance control.
Any of above.
Armature circuit resistance control.
Armature voltage control.
Field resistance control.
Any of above.
Armature circuit resistance control.
Armature voltage control.
Answer
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Electrical Machines
Which type of motors are preferred in lifts?
DC compound motors.
DC series motors.
None of these
DC shunt motors.
DC compound motors.
DC series motors.
None of these
DC shunt motors.
Answer
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Electrical Machines
Cogging in induction motor occurs when
number of stator teeth - number of rotor teeth = 0.
number of stator teeth - number of rotor teeth = odd number.
number of stator teeth - number of rotor teeth = negative number.
number of stator teeth - number of rotor teeth = even number.
number of stator teeth - number of rotor teeth = 0.
number of stator teeth - number of rotor teeth = odd number.
number of stator teeth - number of rotor teeth = negative number.
number of stator teeth - number of rotor teeth = even number.
Answer
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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.
800 Amp.
400 Amp.
320 Amp.
0.5 Amp.
800 Amp.
400 Amp.
320 Amp.
0.5 Amp.
Answer
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