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Electrical Machines
A motor operates in stable region at which of the following slip?
low slip region
both 1 and 2
unity slip
high slip region
low slip region
both 1 and 2
unity slip
high slip region
Answer
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Related Question
Electrical Machines
Which of the following is/are the methods to reduce the armature reaction and its effects?
pole stacking
pole chamfering
compensating winding
All of these
pole stacking
pole chamfering
compensating winding
All of these
Answer
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Electrical Machines
What is the necessity of copper brushes in a dc motors?
To convert alternating supply current to direct current.
To absorb the mechanical shocks produced during running condition.
To increase the flux cutting by the rotor.
None of these.
To convert alternating supply current to direct current.
To absorb the mechanical shocks produced during running condition.
To increase the flux cutting by the rotor.
None of these.
Answer
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Electrical Machines
In a 2 pole lap winding dc machine , the resistance of one conductor is 2Ω and total number of conductors is 100. Find the total resistance
200Ω
50Ω
100Ω
10Ω
200Ω
50Ω
100Ω
10Ω
Answer
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Electrical Machines
Motors for fans and pumps are selected in the rpm range
1440 to 2880.
375 to 500.
720 to 920.
500 to 720.
1440 to 2880.
375 to 500.
720 to 920.
500 to 720.
Answer
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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of
capacitor start induction motor.
transformer with secondary short circuited.
synchronous motor.
repulsion start induction motor.
capacitor start induction motor.
transformer with secondary short circuited.
synchronous motor.
repulsion start induction motor.
Answer
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