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Electrical Machines
In travelling cranes for swing action which motor is preferred?
AC slip ring IM.
DC series motor.
Reluctance motor.
Capacitor type induction motors.
AC slip ring IM.
DC series motor.
Reluctance motor.
Capacitor type induction motors.
Answer
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Related Question
Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.
44.47 Amp.
43 Amp.
29 Amp.
33.33 Amp.
44.47 Amp.
43 Amp.
29 Amp.
33.33 Amp.
Answer
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Electrical Machines
Short circuiting is caused in the armature winding due to
failure of insulation between two commutator bars.
grounding of two or more turns of the same coil.
any of above.
failure of insulation between two turns of coil.
failure of insulation between two commutator bars.
grounding of two or more turns of the same coil.
any of above.
failure of insulation between two turns of coil.
Answer
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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be
250 rpm
1000 rpm
2000 rpm
500 rpm
250 rpm
1000 rpm
2000 rpm
500 rpm
Answer
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Electrical Machines
A synchronous motor will deliver maximum power when
input power factor is unity.
load angle is equal to internal angle θ.
load angle is 0°.
load angle is 45°.
input power factor is unity.
load angle is equal to internal angle θ.
load angle is 0°.
load angle is 45°.
Answer
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Electrical Machines
In a DC shunt generator working on load, the brushes are moved forward in the direction of rotation, as a result of this, commutation will
worsen and terminal voltage will fall
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
improve but terminal voltage will fall.
worsen and terminal voltage will fall
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
improve but terminal voltage will fall.
Answer
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