Commissioning of synchronous generator - Electrical Engineering (MCQ) questions and answers

1)   What parameter(s) is / are checked using the commissioning tests?

a. Turbine speed
b. Condenser vacuum
c. Turbine governor valve opening
d. Only b and c
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
2)   Which among the following sequence is correct for a synchronous generator?

a. I”d > Id > I’d
b. Id > I’d > I”d
c. I”d > I’d > Id
d. Id > I”d > I’d
Answer  Explanation 

ANSWER: I”d > I’d > Id

Explanation:
No explanation is available for this question!
3)   What is filled in between fixed and rotating parts of a cryogenic generator?

a. Dry air
b. Hydrogen
c. Oxygen
d. None of these
Answer  Explanation 

ANSWER: Hydrogen

Explanation:
No explanation is available for this question!
4)   Which power factor condition is not suitable for the operation of synchronous generator?

a. Leading power factor
b. Lagging power factor
c. Both (A) and (B)
d. None of these
Answer  Explanation 

ANSWER: Leading power factor

Explanation:
No explanation is available for this question!
5)   What should be the frequency of the incoming machine while the machine is synchronising to operate in parallel?

a. Approximately 1 / 10 cycle less than the bus frequency
b. Approximately 1 / 10 cycle higher than the bus frequency
c. Approximately 1 / 100 cycle less than the bus frequency
d. Approximately 1 / 100 cycle higher than the bus frequency
Answer  Explanation 

ANSWER: Approximately 1 / 10 cycle higher than the bus frequency

Explanation:
No explanation is available for this question!
6)   Arrange the following according to the starting procedure of a synchronous Generator?

i. Start turbine auxiliaries
ii. Start boiler
iii. Roll the turbine
iv. Start the boiler auxiliaries
v. Keep the units as a spinning reserve


a. i, iii, v, iv, ii
b. i, iv, ii, iii, v
c. iv, i, ii, iii, v
d. iii, i, v, iv, ii
Answer  Explanation 

ANSWER: iv, i, ii, iii, v

Explanation:
No explanation is available for this question!
7)   Which among these is the most significant for the operation of synchronous generator?

a. Frequency
b. Load
c. Terminal voltage
d. Only (a) and (b)
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
8)   Which type of rotor is used by Hydro Generators?

a. Salient pole
b. Cylindrical rotor
c. Both (A) and (B)
d. None of these
Answer  Explanation 

ANSWER: Salient pole

Explanation:
No explanation is available for this question!
9)   Which type of cooling system is preferred for turbo alternators?

a. Forced air
b. Hydrogen
c. Water cooled
d. Only (b) & (c)
e. All of these
Answer  Explanation 

ANSWER: All of these

Explanation:
No explanation is available for this question!
10)   What is the maximum rated output for an engine driven synchronous generator?

a. 10 MW
b. 20 MW
c. 50 MW
d. 100 MW
Answer  Explanation 

ANSWER: 20 MW

Explanation:
No explanation is available for this question!

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