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Electrical Machines
The breakdown torque of a synchronous motor varies as
1/V²
V²
applied voltage V
1/V
1/V²
V²
applied voltage V
1/V
Answer
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Related Question
Electrical Machines
Commutators in DC machines have a role of which converts
high voltage DC to low voltage DC.
AC to DC.
Both AC to DC and DC to AC.
none of these.
high voltage DC to low voltage DC.
AC to DC.
Both AC to DC and DC to AC.
none of these.
Answer
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Electrical Machines
Armature reaction in a DC machine
makes an angle of 90° with the main pole axis.
makes an angle with the main pole axis which is load dependent.
is in direct opposition to the main poles.
is in the same direction as the main poles.
makes an angle of 90° with the main pole axis.
makes an angle with the main pole axis which is load dependent.
is in direct opposition to the main poles.
is in the same direction as the main poles.
Answer
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Electrical Machines
A 3 - Φ slip ring motor has
wound rotor.
double cage rotor.
any of the above.
short-circuited rotor.
wound rotor.
double cage rotor.
any of the above.
short-circuited rotor.
Answer
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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of
residual magnetism.
armature reaction.
permanent magnets.
None of these
residual magnetism.
armature reaction.
permanent magnets.
None of these
Answer
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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?
0.4
0.2
0.02
0.04
0.4
0.2
0.02
0.04
Answer
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