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Electrical Machines
Speed of DC motor can be controlled by varying
all of these.
resistance of armature culture.
applied voltage.
its flux oer pole.
all of these.
resistance of armature culture.
applied voltage.
its flux oer pole.
Answer
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Electrical Machines
Breadth factor is defined as the ratio of
emf with distributed winding to emf with concentrated winding.
emf with concentrated winding to emf with distributed winding.
both 1 and 2.
None of these
emf with distributed winding to emf with concentrated winding.
emf with concentrated winding to emf with distributed winding.
both 1 and 2.
None of these
Answer
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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?
0.65 Hz.
60 Hz.
0.70 Hz.
0.75 Hz.
0.65 Hz.
60 Hz.
0.70 Hz.
0.75 Hz.
Answer
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Electrical Machines
If the full load speed of 3-phase, 50Hz induction motor is 950 rpm, what is its half load speed nearly equals to?
950 rpm
975 rpm
940 rpm
1000 rpm
950 rpm
975 rpm
940 rpm
1000 rpm
Answer
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Electrical Machines
Hysteresis loss is proportional to
f3.
f.
f1.5.
f2.
f3.
f.
f1.5.
f2.
Answer
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Electrical Machines
Sparkless commutation can be achieved by employing
high resistance carbon brushes.
compensating winding.
inter poles.
any one or more of the above methods.
high resistance carbon brushes.
compensating winding.
inter poles.
any one or more of the above methods.
Answer
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