Power System(Generation)-02:
29) On
which cycle does the gas turbine work?
a. Carnot
b. Brayton
c. Dual cycle
d. Rankine cycle
30) The
gas turbines are mainly used in ________.
a. Locomotives
b. Aircrafts
c. Automobiles
d. Pumping stations
31) Gas
turbine plants are not used ___________.
a. as
peak load plants.
b. as base load plants.
c. as standby power plants.
d. in combination with the steam power plants.
32) Combined
cycle power plants are suitable for ___________.
a. Base
loads.
b. Peak loads.
c. Intermediate loads.
d. Both base and peak loads.
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33) Name
the turbine developed on the basis of aircraft engine technology. a. Brayton 34) Which
among these is the main component of a gas turbine plant? a. Condenser 35) Which
type of compressor is used in a gas turbine plant? a. Reciprocating
compressor 36) What
part or % of power developed is utilised for driving the compressor? a. 65
% 37) The
gas turbine power plant mainly uses which among the following fuels? a. Coal
and Peat 38) The
heating value of gaseous fuels is about a. 500
kJ/litre 39) The
compressor has to be started a. Before
starting the gas turbine. 40) What
would be the temperature of the gas in the combustion chamber? a. 500
° |
41) The
efficiency of the open cycle gas plant is quite low. 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
42) Which
among these are used to improve the efficiency of gas turbines?
a. Regenerator.
b. Inter cooling.
c. Reheating.
d. All of these.
43) 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
44) 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
45) 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
46) Which
among these plants are most efficient?
a. Open
cycle
b. Combined cycle
c. Closed cycle
d. None of these
47) 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 1 revolution
d. 4 stroke and 4 revolutions
48) The
speed of the diesel engine may vary from
a. 0
– 100 rpm
b. 200 – 1000 rpm
c. 500 -5000 rpm
d. 1000 – 3000 rpm
49) 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 plants.
50) 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
51) 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
52) Which
among the following instruments are provided on the exhaust line to reduce the
pressure?
a. Ducts
b. Muffler
c. Strainers
d. Purifiers
53) Which
type of cylinder configuration is commonly used?
a. Vertical
– in line
b. V – type
c. Horizontal type
d. All of these
54) What
is supercharging?
a. Pumping
of air into the cylinder at the pressure greater than atmospheric pressure.
b. Pumping of air out of the cylinder at the pressure greater than
atmospheric pressure.
c. Pumping of air into the cylinder at the pressure lower than atmospheric
pressure.
d. Pumping of air out of the cylinder at the pressure lower than
atmospheric pressure.
55) Calculate
the overall efficiency of the diesel plant if the fuel consumption is 0.24 kg
per kWh and the calorific value of the fuel being 10000 kcal/kg.
a. 30.78
b. 35.83
c. 28.73
d. 36.86
56) The
lubrication cost in a diesel power plant is _______.
a. High
b. Low
c. Moderate
d. Very low
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