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Electrical Machines
In case of DC Shunt Motor electromagnetic torque developed is
Proportional to the armature current.
None of above.
Inversely proportional to the armature current.
Proportional to the square of armature current.
Proportional to the armature current.
None of above.
Inversely proportional to the armature current.
Proportional to the square of armature current.
Answer
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Related Question
Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is
40 V
50 V
20 V
zero
40 V
50 V
20 V
zero
Answer
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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?
15.28 Nm
Zero
16.55 Nm
15.6 Nm
15.28 Nm
Zero
16.55 Nm
15.6 Nm
Answer
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Electrical Machines
Satisfactory commutation of DC machine requires
All of these
brushes should smoothly run in the holders.
smooth, concentric commutator properly undercut.
brushes should be of proper grade and size.
All of these
brushes should smoothly run in the holders.
smooth, concentric commutator properly undercut.
brushes should be of proper grade and size.
Answer
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Electrical Machines
For satisfactory performance of 3-phase 480V, 60 Hz induction motor, the supply voltage at 50 Hz should be equal to
350 V.
420 V.
400 V.
480 V.
350 V.
420 V.
400 V.
480 V.
Answer
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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is
1000 rpm
3000 rpm
1500 rpm
750 rpm
1000 rpm
3000 rpm
1500 rpm
750 rpm
Answer
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