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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
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
worsen and terminal voltage will fall
improve but terminal voltage will fall.
improve and terminal voltage will rise .
worsen and terminal voltage will rise.
worsen and terminal voltage will fall
improve but terminal voltage will fall.
Answer
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Related Question
Electrical Machines
Iron loss in a transformer mainly occurs in
winding of transformer.
transformer insulating oil.
steel core in transformer.
iron made tank of transformer.
winding of transformer.
transformer insulating oil.
steel core in transformer.
iron made tank of transformer.
Answer
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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?
60%
38%
40%
68%
60%
38%
40%
68%
Answer
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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is
0.4.
1.
0.6.
0.8.
0.4.
1.
0.6.
0.8.
Answer
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Electrical Machines
The polarity of a DC generator can be reversed by
reversing the field current.
reversing field electric current as well as direction of rotation.
increasing field current.
any of above.
reversing the field current.
reversing field electric current as well as direction of rotation.
increasing field current.
any of above.
Answer
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Electrical Machines
Which of the following motors has low ratings only?
Shaded pole
Capacitor run
Resistance split phase
Capacitor start
Shaded pole
Capacitor run
Resistance split phase
Capacitor start
Answer
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