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Electrical Machines
A 3 - ÃŽÂ¦, 4 pole IM is supplied from a 50 Hz source. Calculate rotor frequency when rotor runs 600 rpm?
30 Hz.
20 Hz.
Can be determined.
35 Hz.
30 Hz.
20 Hz.
Can be determined.
35 Hz.
Answer
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Related Question
Electrical Machines
The starting resistance of DC motor is generally
around 500 ohms.
1000 ohms.
Infinitely large.
Low.
around 500 ohms.
1000 ohms.
Infinitely large.
Low.
Answer
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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is
less and maximum torque decreases
less and maximum torque increases
more and maximum torque remains constant
more and maximum torque decreases
less and maximum torque decreases
less and maximum torque increases
more and maximum torque remains constant
more and maximum torque decreases
Answer
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Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be
PN/2.
PN/3000.
PN/120.
PN/60.
PN/2.
PN/3000.
PN/120.
PN/60.
Answer
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Electrical Machines
A DC series motor is running with a divertor connected across its field winding. If the divertor resistance is reduced then the speed of the motor will
remain unaltered.
increase.
become execessively high.
decrease.
remain unaltered.
increase.
become execessively high.
decrease.
Answer
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Electrical Machines
What is the mechanical power developed by a DC series motor is maximum?
Back emf is equal to zero.
None of above.
Back emf is equal to applied voltage.
Back emf is equal to half the applied voltage.
Back emf is equal to zero.
None of above.
Back emf is equal to applied voltage.
Back emf is equal to half the applied voltage.
Answer
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