Electrical Machines Questions and Answers – Induction Generator

This set of Electrical Machines Multiple Choice Questions & Answers (MCQs) focuses on “Induction Generator”.

1. A 3-phase induction motor can also be run as ______________
a) synchronous generator
b) induction generator
c) dc shunt motor
d) any of the mentioned
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2. Induction generator ____________
a) can not work in isolation
b) can work in isolation
c) should work in parallel with synchronous generators
d) any of the mentioned
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3. A self excited induction generator ____________
a) must have static capacitor bank
b) can have static capacitor bank
c) should have static capacitor bank
d) any of the mentioned
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4. For an induction motor to work in isolation, it should have ____________
a) lagging reactive power source
b) leading reactive power source
c) leading reactive power sink
d) any of the mentioned
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5. The magnetization curve in the induction generator working in isolation has similar characteristic as ____________
a) dc shunt generator
b) dc cumulative field generator
c) synchronous generator
d) all of the mentioned
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6. If the residual flux is absent in the rotor iron of the isolated induction generator ____________
a) it will not run
b) it will run as induction motor
c) it will burn the winding
d) it will not affect the characteristic of the generator
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7. Voltage build up in an isolated induction generator depends on ____________

A. Capacitor bank value
B. Residual magnetism of the rotor iron
C. Residual magnetism of the stator iron

a) A, B
b) A, B, C
c) B
d) A, C
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8. I. Voltage of an externally excited induction generator can not be controlled.
II. Frequency of an externally excited induction generator can be controlled.
a) I is true, II is false
b) I is true, II is true
c) I is false, II is false
d) I is false, II is true
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9. What is/are the shortcomings of an induction generator in real time system?
a) It needs considerable amount of reactive power
b) Efficiency is poor
c) It can work at leading power factor only
d) All of the mentioned
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10. Induction generator is self excited machine.
a) True
b) False
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11. Induction generator can only work at leading reactive power.
a) True
b) False
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12. Choose the correct match for the corresponding characteristics of a 3-phase induction motor.

   x-axis                         y-axis                  
 A.  stator current            power output            (P) Curve I
 B.  torque                    slip                    (Q) Curve II
 C.  speed                     power output            (R) Curve III

a) A-II, B-III, C-I
b) A-III, B-II, C-I
c) A-III, B-I, C-II
d) A-I, B-II, C-III
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13. Which is the most acceptable application field where an induction generator can be used?
a) wind power system
b) steam power system
c) hydro power system
d) nuclear power station
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14. A 3-phase induction motor has full load efficiency of 0.7 and a maximum efficiency of 0.85. It is operated at a slip of 0.6 by reduced voltage method. The efficiency of the motor at this operating point is?
a) less than 0.35
b) greater than 0.35
c) in the range of 0.8 to 0.2
d) none of the mentioned
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15. Two three phase squirrel-cage induction generator are identical in all respects except the fact that the slot depths in machine B is more than that of A. Machine B as compared to machine A, will have _________
a) less pull out torque but better power factor
b) more pull out torque but poor power factor
c) less pull out torque and poor power factor
d) more pull out torque and better power factor
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Sanfoundry Global Education & Learning Series – Electrical Machines.

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