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Electrical Machines
Consider the following statements about commutating poles which are fitted on most large dc Shunt motors: 1. The commutating poles are placed in the geometric neutral plane and their number is usually Equal to the number of main poles 2. The winding on the commutating poles is connected in series with the shunt-field winding on the main poles 3. The polarity of the commutating pole must be that of the next pole further ahead 4. The commutating poles neutralize the reactance voltage produced in the coil undergoing Commutation. Of these statements,
1, 2 and 3 are correct
1, 2 and 4 are correct
2, 3 and 4 are correct
1 and 4 are correct
1, 2 and 3 are correct
1, 2 and 4 are correct
2, 3 and 4 are correct
1 and 4 are correct
Answer
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Related Question
Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are
1, 3, 5
2, 4 ,5
1, 4
2, 3 , 5
1, 3, 5
2, 4 ,5
1, 4
2, 3 , 5
Answer
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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is
Cummulative compound.
have an equal number of electrons and protons.
Series shunt.
Differentical compound.
Cummulative compound.
have an equal number of electrons and protons.
Series shunt.
Differentical compound.
Answer
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Electrical Machines
If in DC Shunt Motor the flux is reduced suddenly to zero, then
the speed of motor will be reduced.
the armature current will reduce.
the motor will come to stop.
the motor will attain dangerously high speed.
the speed of motor will be reduced.
the armature current will reduce.
the motor will come to stop.
the motor will attain dangerously high speed.
Answer
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Electrical Machines
What is/are the advantages of parallel operation of alternators?
Increase efficiency under light load conditions
continuity supply is maintained
All of these
Increase in reliability
Increase efficiency under light load conditions
continuity supply is maintained
All of these
Increase in reliability
Answer
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Electrical Machines
When a DC cummulative compound wound motor is loaded
Torque decrease and speed increases.
Torque and speed both increase.
Both torque and speed decrease.
Torque increase and speed decrease.
Torque decrease and speed increases.
Torque and speed both increase.
Both torque and speed decrease.
Torque increase and speed decrease.
Answer
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