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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is
5.46 KW.
0.9103 KW.
2.73 KW.
1.644 KW.
5.46 KW.
0.9103 KW.
2.73 KW.
1.644 KW.
Answer
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Related Question
Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of
6 / 7.
5 / 6.
4 / 5.
2 / 3.
6 / 7.
5 / 6.
4 / 5.
2 / 3.
Answer
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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying
Any of above.
Shunt field resistance control.
Armature voltage control.
Armature resistance control.
Any of above.
Shunt field resistance control.
Armature voltage control.
Armature resistance control.
Answer
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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase
rotor resistance
None of these
supply frequency
supply voltage
rotor resistance
None of these
supply frequency
supply voltage
Answer
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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will
Oscillate around the normal speed.
Increase.
Remain unaltered.
Reduce.
Oscillate around the normal speed.
Increase.
Remain unaltered.
Reduce.
Answer
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Electrical Machines
For a DC Shunt Motor having armature resistance of 0.5 Ω and 2 A armature current at no-load, when the armature current is changed to 20 A at loaded condition the speed is 1000 r.p.m. What is the speed at no-load?
4575.4 r.p.m.
none of above.
1130 r.p.m.
1037.5 r.p.m.
4575.4 r.p.m.
none of above.
1130 r.p.m.
1037.5 r.p.m.
Answer
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