Economics of Power Generation Mcqs - Set 9

1)   By the use of which of the following power factor can be improved?

a. Phase advancers
b. Synchronous compensators
c. Static capacitors
d. Any of the above
Answer  Explanation 

ANSWER: Any of the above

Explanation:
No explanation is available for this question!


2)   An induction motor has relatively high power factor at__________?

a. rated r.p.m.
b. no load
c. 20 percent load
d. near full load
Answer  Explanation 

ANSWER: near full load

Explanation:
No explanation is available for this question!


3)   In a distribution system, in order to improve power factor, the synchronous capacitors are installed__________?

a. at the receiving end
b. at the sending end
c. either A. or (b)
d. none of the above
Answer  Explanation 

ANSWER: at the receiving end

Explanation:
No explanation is available for this question!


4)   Which of the following is the disadvantage of a synchronous condenser?

a. High maintenance cost
b. Continuous losses in motor
c. Noise
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


5)   For a consumer the most economical power factor is generally____________?

a. 0.5 lagging
b. 0.5 leading
c. 0.95 lagging
d. 0.95 leading
Answer  Explanation 

ANSWER: 0.95 lagging

Explanation:
No explanation is available for this question!


6)   In an interconnected system, the diversity factor of the whole system:

a. remains unchanged
b. decreases
c. increases
d. none of the above
Answer  Explanation 

ANSWER: increases

Explanation:
No explanation is available for this question!


7)   __________ will be least affected due to charge in supply voltage frequency.

a. Electric clock
b. Mixer grinder
c. Ceiling fan
d. Room heater
Answer  Explanation 

ANSWER: Room heater

Explanation:
No explanation is available for this question!


8)   Which of the following is not necessarily an advantage of interconnecting various power stations?

a. Improved frequency of power supplied
b. Reduction in total installed capacity
c. Increased reliability
d. Economy in operation of plants
Answer  Explanation 

ANSWER: Improved frequency of power supplied

Explanation:
No explanation is available for this question!


9)   For a diesel generating station the useful life is expected to be around_________Years?

a. 15 to 20 years
b. 20 to 50 years
c. 50 to 75 years
d. 75 to 100 years
Answer  Explanation 

ANSWER: 15 to 20 years

Explanation:
No explanation is available for this question!


10)   Which of the following is not a method for estimating depreciation charges?

a. Sinking fund method
b. Straight line method
c. Diminishing value method
d. Halsey’s 50—50 formula
Answer  Explanation 

ANSWER: Halsey’s 50—50 formula

Explanation:
No explanation is available for this question!


11)   Which of the following source of power is least reliable?

a. Solar energy
b. Geothermal power
c. Wind power
d. iMHD
Answer  Explanation 

ANSWER: iMHD

Explanation:
No explanation is available for this question!


12)   An over excited synchronous motor on no load is known as__________?

a. synchronous condenser
b. generator
c. induction motor
d. alternator
Answer  Explanation 

ANSWER: synchronous condenser

Explanation:
No explanation is available for this question!


13)   Which of the following plants is almost inevitably used as base load plant?

a. Diesel engine plant
b. Gas turbine plant
c. Nuclear power plant
d. Pumped storage plant
Answer  Explanation 

ANSWER: Nuclear power plant

Explanation:
No explanation is available for this question!


14)   Which of the following component, in a steam power plant, needs maximum maintenance attention?

a. Steam turbine
b. Condenser
c. Water treatment plant
d. Boiler
Answer  Explanation 

ANSWER: Boiler

Explanation:
No explanation is available for this question!


15)   The effect of electric shock on human body depends on which of the following?

a. current
b. voltage
c. duration of contact
d. all of the above
Answer  Explanation 

ANSWER: all of the above

Explanation:
No explanation is available for this question!


16)   Which of the following devices may be used to provide protection against lightening over voltages?

a. Horn gaps
b. Rod gaps
c. Surge absorbers
d. All of the above
Answer  Explanation 

ANSWER: All of the above

Explanation:
No explanation is available for this question!


17)   Load shedding is possible through which of the following?

a. Switching of the loads
b. Frequency reduction
c. Voltage reduction
d. Any of the above
Answer  Explanation 

ANSWER: Any of the above

Explanation:
No explanation is available for this question!


18)   The knowledge of diversity factor helps in determining__________?

a. plant capacity
b. average load
c. peak load
d. kWh generated
Answer  Explanation 

ANSWER: plant capacity

Explanation:
No explanation is available for this question!