Power Generation Technology MCQ Part3 (PGT MCQ)


61) Why is load shedding done? the

A. Reducing peak demand on

B.Repairing of machines 
C.Power factor improvement system
d. Efficient operation of equipment

ANSWER: Reducing peak demand on the system.

62) Generators for the base load plants are usually designed for maximum efficiency around

a .20% overload 
b. Full load
C.75% full load
d. None of these

ANSWER: Full load

63) What are fixed charges?

a. Cost of investment irrespective of energy generated
 b. Operating cost of the fuel along with cost of investment plant
C.Operating cost only 
d. None of the above

ANSWER: Cost of investment irrespective of energy generated.

64) Which components are included in the annual operating cost?
 a. Fuel, maintenance cost and labour
b Interest, taxes, insurance and depreciation
C.Both a) and (b) 
D. None of the above

ANSWER: Fuel, maintenance cost and labour

65.What does the annual fixed cost include? 
A. fuel, maintenance cast and labour
B interest, taxes, insurance and depreciation 
c.both a) and b)
D. None of the above

ANSWER: Fuel, maintenance cost and labour

65) What does the annual fixed cost include

a Fuel, maintenance cost and labour b. Interest, taxes, insurance and depreciation
C.Both (al and (b)
d. None of the above

ANSWER: Interest, taxes, insurance and depreciation

66) The capital cost of a power plant depends on.
 a. Total installed capacity only
b. Total number of units only 
C.Both (a) and (b) c.
d. None of these

ANSWER: Both (a) and (b)

67) What is meant by semi fixed charges!

a. It is the cost which is independent of maximum demands and units generated. 
b. It is the cost which depends only on the units generated. 
c. it is the cost which depends upon the maximum demand but it is independent of units generated
d. None of these

ANSWER: It is the cost which depends upon the maximum demand but it is independent of units generated


68) The annual depreciation reserve depends on

a Capital cost only.
b Salvage value only.
c On any method of calculation of depreciation factor
d. All of these None of these

ANSWER: All of these

69) Depreciation charge may be based on which method?
 a. Straight line method
B.Sinking fund method. 
C.Both talib
d. None of these

ANSWER: Both (a) (b)

70) In a straight line method, annual depreciation charges are calculated by
A. The capital cost minus salvage value divided by the number of years of life
 b. The capital cost divided by the number of years of life.
C.Both a and b
 d. None of these
ANSWER: Both (a) & (b).

71) What percent of installed capacity of gas turbines contribute to the total installed capacity of the power plants in India?

a. 5% 
b. 8%
c. 11% 
d. 15

ANSWER: 11 %

72) Which state in India among these doesn't have a gas turbine plant?

a Jammu Kashmir
 b. Tripura
c Tamil Nadu
d. Bihar

ANSWER: Tamil Nadu

73) On which cycle does the gas turbine work?

a. Carnot
b. Brayton
c. Dual cycle
d. Rankine cycle

ANSWER: Brayton

74) The gas turbines are mainly used in 
a .Locomotives
b. Aircrafts
c. Automobiles 
d. Pumping stations

ANSWER: Automobiles

75) Gas turbine plants are not used
a.peak load plants
 b. as base load plants.
c.as standby power plants.
d. in combination with the steam power plants.

ANSWER: as base load plants.

76) Combined cycle power plants are suitable for
a. Base loads. 
b. Peak loads
c Intermediate loads.
d. Both base and peak loads

ANSWER: Both base and peak loads.

76) Name the turbine developed on the basis of aircraft engine technology.

a Brayton

b. Aerodynamic 
C.Aero derivative

d. Rankine

ANSWER: Aero derivative

78) Which among these is the main component of a gas turbine plant?

a. Condenser 
b. Compressor
c Boiler
d. None of these

ANSWER: Compressor


79) Which type of compressor is used in a gas turbine plant? 
a Reciprocating compressor
b. Screw compressor
c. Multistage anal flow compressor d. None of these

ANSWER: Multistage axial flow compressor

80) What part or of power developed is utilised for driving the compressor
a.65% 
b. 70%
C.55 %
d. 80%

ANSWER: 65%

81) The gas turbine power plant mainly uses which among the following fuels? 
a.Coal and Peat
b. Kerosene oil and diesel oil and residual cil 
c Gas cil
d. Natural gas and tiquid petroleum fuel

ANSWER: Natural gas and liquid petroleum fuel

82) The heating value of gaseous foels is about

a. 500 kG/litre 
b. 30 litre
C.100 kritre 
d. 10 kJ/litre

ANSWER: 30 kl/litre

83) The compressor has to be started

a. Before starting the gas turbine
 b. After starting the gas turbine.
c. Simultaneously with starting of gas turbine.
d. At any time during the operation.

ANSWER: Before starting the gas turbine.

84) What would be the temperature of the gas in the combustion chamber?

a. 500 
b. 1600
c. 1200
d. 650

ANSWER: 1600

85) The efficiency of the open cycle gas plant is quite lew. Why?
 a. Gas gets cooled before reaching the turbine wheels 
b. A lot of mechanical energy is used up by the compressor.
c. Both (a) and (b).
d. None of these

ANSWER: Both (a) and (b).

86) Which among these are used to improve the efficiency of gas turbines?
a. Regenerator.
B. Inter cooling
C.Reheating
D.All of these

ANSWER: All of these

87) What is regeneration?

a. Removal of heat from compressed air between stages of compression 
b. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber 
C.To increase the temperature of partially expanded gases by burning more fuel.
d. None of these

ANSWER: Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber.

88) What is meant by inter cooling?

a Removal of heat from compressed air between stages of compression 
b. Transfer of heat energy from exhaust gases to the compressed air flowing between compressor and the combustion chamber
c. To increase the temperature of partially expanded gases by burning more fuel. 
d. None of the above

ANSWER: Removal of heat from compressed air between stages of compression

89) Which material is used for the manufacture of the turbine blades?

a Stainless steel 
b. Carbon steel
c. High nickel alloy 
d. High alloy steel

ANSWER: High nickel alloy

90) Which among these plants are most efficient?

a.Open cycle
B. Combined cycle
C.Closed cycle
 d. None of these

ANSWER: Combined cycle

91) In a 2 stroke engine, the operation cycle are completed in how many strokes and revolution?
A. 4 strokes and 2 revolutions
B.2 stroke and 2 revolutions
C.2 strokes and I revolution 
d.4 stroke and 4 revolutions

ANSWER 2 strokes and 1 revolution

92). The sp of the diesel pre may vary from

a. 0 - 100 rpm 
b. 200 - 1000 rpm
c 500 -5000 rpm
 d. 1000 - 3000 rpm

ANSWER: 1000 - 3000 rpm

93) The diesel plants are mainly used

a. as peak load plants 
b. as base load plants
c .as standby power plants.
d. both peak and stand by plan
ANSWER: both peak and stand by plants.

24) What is the ranging capacity of the diesel plant? 
a. 50 - 750 kW

b. 100 - 1175 kW

c. 75 - 3750 kW 
d. 150 - 4575 kW

ANSWER: 75 - 3750 kW

25) It is very much necessary to treat the makeup water to remove the scale forming the impurities. Which treatment is used?

a. Zeolite softener

b. Lime or lime soda treatment
 c. Both (a) and (b)

d. None of the above

ANSWER: Both (a) and (b)