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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
420 V.
350 V.
480 V.
400 V.
420 V.
350 V.
480 V.
400 V.
Answer
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Related Question
Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When
none of above.
either field terminals are reversed or armature terminals are reversed.
only armature terminals are reversed.
only field terminals are changed.
none of above.
either field terminals are reversed or armature terminals are reversed.
only armature terminals are reversed.
only field terminals are changed.
Answer
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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be
57.1%.
88.8%.
48.0%.
59.2%.
57.1%.
88.8%.
48.0%.
59.2%.
Answer
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Electrical Machines
Magnetic field of a DC generator is produced by what?
Permanent magnets.
Both B and C.
Electromagnets.
None of the options.
Permanent magnets.
Both B and C.
Electromagnets.
None of the options.
Answer
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Electrical Machines
An unexcited single phase synchronous motor is
AC series motor.
reluctance motor.
repulsion motor.
universal motor.
AC series motor.
reluctance motor.
repulsion motor.
universal motor.
Answer
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Electrical Machines
Copper brushes in DC machine are used
None of these
where high voltage and low current.
in both of above cases.
where low voltage and high currents are involved.
None of these
where high voltage and low current.
in both of above cases.
where low voltage and high currents are involved.
Answer
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