Electrical Machines Questions and Answers – Analysis of the Equivalent Circuit

This set of Electrical Machines Questions and Answers for Experienced people focuses on “Analysis of the Equivalent Circuit”.

1. Below is the torque slip characteristic of the induction machine. What can be inferred from it?

a) R22 > R21
b) R22 < R21
c) R22 = R21
d) R22 = -R21
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2. Choose the most appropriate from the following characteristics of 3 phase induction motor torque-slip characteristics.
a)
b)
c)
d)
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3. If the reactance of the 3-phase slip ring induction motor is increased then the torque-slip characteristic varies as?
a)
b)
c)
d)
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4. The reactance vs slip is given by?
a)
b)
c)
d)
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5. Induction generator is equivalent to _________
a) underexcited alternator
b) dc generator
c) over excited alternator
d) leading over excited alternator
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6. When an induction generator is connected to an infinite bus, it _________
a) requires no capacitor bank
b) requires star connected capacitor bank
c) requires delta connected capacitor bank
d) requires any capacitor bank
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7. Torque produced by induction generator is negative.
a) True
b) False
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8. Slip greater than unity is obtained practically by _________
a) plugging
b) changing phase sequence
c) changing stator leads
d) any of the mentioned
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9. Changing the rotor resistance will also affect _________
a) starting torque, speed, current
b) maximum torque, speed, current
c) maximum torque, speed, current, starting torque
d) speed and current
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10. At starting, developed mechanical power is _____ and developed torque is ______
a) zero, not zero
b) zero,zero
c) not zero, zero
d) not zero, maximum
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11. Mechanical power developed in the braking region of the induction motor is _________
a) negative
b) positive
c) zero
d) any of the mentioned
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12. Developed torque during plugging is _________
a) negative
b) positive
c) zero
d) any of the mentioned
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13. In the 3-phase induction motor developed torque during plugging is ______ mechanical power developed in the braking region of the induction motor is ______
a) positive, negative
b) negative, positive
c) positive, positive
d) negative, negative
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14. The power slip characteristic is given as?
a)
b)
c)
d)
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Sanfoundry Global Education & Learning Series – Electrical Machines.

To practice all areas of Electrical Machines for Experienced people, here is complete set of 1000+ Multiple Choice Questions and Answers.