1) What is / are the major assumptions made in the calculation of swing equations?
a. Damper windings are neglected
b. The machine is lossless
c. The machine has to run at synchronous speed
d. Both (a) and (b)
e. All of these
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Answer
Explanation
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ANSWER: Both (a) and (b)
Explanation:
No explanation is available for this question!
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2) Why are the series capacitors used?
a. Improve the voltage
b. Reduce the fault level
c. Compensate for line inductive reactance and improve the stability of the power system.
d. Improves the power factor
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Answer
Explanation
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ANSWER: Compensate for line inductive reactance and improve the stability of the power system.
Explanation:
No explanation is available for this question!
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3) Which among the following methods are used to improve steady state stability?
a. Reducing the reactance between the transmission and receiving points.
b. By using bundled conductors.
c. By increasing the excitation of generator or motor or both.
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: All of these
Explanation:
No explanation is available for this question!
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4) Which curve represents the reluctance power in the following power angle curve of a machine?
a. Curve A
b. Curve B
c. Curve C
d. Curve A and curve B
e. All the above
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Answer
Explanation
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ANSWER: Curve C
Explanation:
No explanation is available for this question!
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5) What is the range of ‘δ’ for stable operation?
a. 0° < δ < 45°
b. 45° < δ < 90°
c. 0° < δ < 90°
d. 0° < δ < 120°
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Answer
Explanation
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ANSWER: 0° < δ < 90°
Explanation:
No explanation is available for this question!
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6) At what value of ‘δ’ the maximum power transfer takes place?
a. 45 °
b. 90 °
c. 120 °
d. 180 °
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Answer
Explanation
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ANSWER: 90 °
Explanation:
No explanation is available for this question!
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7) What is power angle equation of synchronous machines?
a. An equation between electrical power generated to the angular displacement of the rotor
b. An equation between mechanical power generated to the angular displacement of the rotor
c. An equation between electrical power generated to the angular displacement of stator windings
d. An equation between mechanical power generated to the angular displacement of stator windings
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Answer
Explanation
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ANSWER: An equation between electrical power generated to the angular displacement of the rotor
Explanation:
No explanation is available for this question!
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8) Which point on the graph represents the steady state stability limit of the system?
a. Point A
b. Point B
c. Point C
d. Point D
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Answer
Explanation
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ANSWER: Point A
Explanation:
No explanation is available for this question!
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9) What will be the inertia constant H, for a water wheel generator having a speed less than 200 rpm?
a. 2 - 4
b. 2 - 3
c. 1 - 2
d. 5 - 6
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Answer
Explanation
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ANSWER: 2 - 3
Explanation:
No explanation is available for this question!
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10) What are the main applications of the swing curves?
a. Designing the rotor field windings
b. Designing the protective devices
c. Used to limit the size of the machine
d. All of these
e. None of these
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Answer
Explanation
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ANSWER: Designing the protective devices
Explanation:
No explanation is available for this question!
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