Voltage Stability Frequency Stability - Electrical Engineering (MCQ) questions and answers

1)   What is the result of frequency instability?

a. Voltage collapse
b. Frequency swings
c. Tripping of generating units
d. Both (b) and (c)
e. All of these
Answer  Explanation 

ANSWER: Both (b) and (c)

Explanation:
No explanation is available for this question!
2)   What is frequency stability?

a. To maintain steady frequency following severe disturbance resulting in the imbalance between transformer and load
b. To maintain steady frequency following severe disturbances resulting in the imbalance between generators and load
c. To maintain a steady frequency in all the protection components and the transmission lines.
d. Both (a) and (b)
e. All of these
Answer  Explanation 

ANSWER: To maintain steady frequency following severe disturbances resulting in the imbalance between generators and load

Explanation:
No explanation is available for this question!
3)   Which among the following phenomenon is generally associated with voltage stability?

a. Temporary load reduction
b. Voltage is reduced
c. Voltage collapses
d. All of these
e. None of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
4)   What is the main cause of voltage instability?

a. Generators
b. Transformers
c. Loads
d. Line losses
Answer  Explanation 

ANSWER: Loads

Explanation:
No explanation is available for this question!
5)   What is voltage stability?

a. To maintain steady voltages at all the buses after the occurrence of fault.
b. To maintain steady voltages at all the buses before the occurrence of fault.
c. To maintain the system frequency after the severe disturbances
d. All of these
e. None of these
Answer  Explanation 

ANSWER: To maintain steady voltages at all the buses after the occurrence of fault.

Explanation:
No explanation is available for this question!

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