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Electrical Machines
Commutation in a DC machine may be explained as a process
how alternate flux affects the main field flux.
in which magnetic field is set up.
by virtue of which emf is induced in the armature conductors.
by which electric current in a coil is reversed.
how alternate flux affects the main field flux.
in which magnetic field is set up.
by virtue of which emf is induced in the armature conductors.
by which electric current in a coil is reversed.
Answer
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Related Question
Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is
0.95
0.87
1.06
0.96
0.95
0.87
1.06
0.96
Answer
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Electrical Machines
Scott connections are used for
three phase to two phase transformation.
three phase to single phase transformation.
single phase to three phase transformation.
any of the above.
three phase to two phase transformation.
three phase to single phase transformation.
single phase to three phase transformation.
any of the above.
Answer
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Electrical Machines
The brush-axis of a bipolar dc motor is rotated by 90°. The effect of this rotation on the back emf Eband the torque developed Tdwould be such that
Eb is unchanged, but Td is zero
both Eb and Td are zero
Eb is zero, but Td is unchanged
both Eb and Td are unchanged
Eb is unchanged, but Td is zero
both Eb and Td are zero
Eb is zero, but Td is unchanged
both Eb and Td are unchanged
Answer
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Electrical Machines
In DC machine yoke offers
flux path completion
both A and B
produce working flux
mechanical protection to the machine
flux path completion
both A and B
produce working flux
mechanical protection to the machine
Answer
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Electrical Machines
When maximum starting torque is obtained, rotor power is
Answer
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