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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?
15.30%.
14.28%.
18.25%.
16.67%.
15.30%.
14.28%.
18.25%.
16.67%.
Answer
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Related Question
Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will
rotate in the same direction as before maintenance.
not start at all.
get heated and damaged.
rotate in direction opposite to that before maintenance.
rotate in the same direction as before maintenance.
not start at all.
get heated and damaged.
rotate in direction opposite to that before maintenance.
Answer
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Electrical Machines
In a DC machine the armature mmf is
rotating with respect to field poles.
stationary with respect to field poles.
stationary with respect to armature.
rotating with respect to field poles as well as armature.
rotating with respect to field poles.
stationary with respect to field poles.
stationary with respect to armature.
rotating with respect to field poles as well as armature.
Answer
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Electrical Machines
Fufuraldehyde analysis is done to determine the
condition of lamination on CRGO steel sheet.
condition of cork gaskets used in transformer.
condition of paper insulation in transformer.
condition of oil in transformer.
condition of lamination on CRGO steel sheet.
condition of cork gaskets used in transformer.
condition of paper insulation in transformer.
condition of oil in transformer.
Answer
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Electrical Machines
In a DC machine, for the same value of Æ, Z and N; which one of the following statements is correct?
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Armature emf depends on weather the machine is running as a motor or generator.
Armature emf is same as long as the flux density in the air gap remains the same.
Armature emf is more with wave winding than with lap winding.
Armature emf is less with wave winding than with lap winding.
Answer
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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?
Synchronous motor.
DC series motor.
Single phase induction motor.
AC slip ring motor.
Synchronous motor.
DC series motor.
Single phase induction motor.
AC slip ring motor.
Answer
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