問題一覧
1
What is the air standard cycle for a Gas Turbine called?
Brayton cycle
2
What is the difference between a Rankine cycle & a Brayton cycle ?
working fluid in a Brayton cycle doesn't undergo phase change while it does in Rankine cycle
3
Which of the following is a type of Gas Turbine Plant ?
Open
4
Power is produced when the working fluid does some work on the?
Blades
5
A Gas Turbine is which type of combustion plant ?
Internal
6
Which among these is the main component of a gas turbine plant ?
Compressor
7
Which type of compressor is used in a gas turbine plant?
Multistage axial flow compressor
8
What part or % of power developed is utilised for driving the compressor?
65%
9
The gas turbine power plant mainly uses which among the following fuels ?
Natural gas and liquid petroleum fuel
10
A gas turbine works on which cycle?
Brayton
11
The gas turbine are mainly used in?
Automobiles
12
Gas turbine plants are not used -
As base load plants
13
Combined cycle power plants are suitable for?
Both base and peak loads
14
Name the turbine developed on the basis of aircraft engine technology -
Aero derivative
15
The constant pressure gas turbine works on the-
Brayton cycle
16
Brayton cycle consists of sets of process
Isentropic and constant pressure
17
Mechanical efficiency of a gas compared to internal combustion engine is-
higher
18
The ideal efficiency of simple gas turbine cycle depends upon :
pressure-ratio
19
The gas in cooling chamber of a closed cycle gas turbine is cooled at -
Constant pressure
20
In a gas turbine cycle with regeneration -
thermal efficiency increases
21
Q-
d
22
Efficiency of gas turbine is increased by-
all of these
23
Gas turbine as compared to steam turbine-
all of these
24
A closed cycle gas turbine consists of a-
all of these
25
In a closed cycle gas turbine, the air is compressed-
isentropically
26
The maximum temperature in a gas turbine-
700° C
27
The ratio of the net work obtained from the gas turbine plant to the turbine work is known as-
work ratio
28
The compression ratio in a gas turbine is-
7
29
The work ratio of simple gas turbine cycle depends on-
all of these
30
Gas turbine use following type of air compressor-
axial flow type
31
It is not possible to use closed gas turbine cycle in aeronautical engines because-
it requires cooling water for its operation
32
A gas turbine used in aircraft should have -
low weight and small frontal area
33
Pick up the correct statement-
gas turbine uses high air-fuel ratio to reduce outgoing temperature
34
Number of stages in any gas turbine is equal to-
total heat drop in turbine ÷ heat drop in stage
35
Choose the correct statement-
gas turbine is capable of rapid start up and loading
36
The blades of gas turbines are made of -
high nickel alloy (neimonic)
37
The gas turbine can be used with -
any one of these
38
Air compressors in gas turbine plants are protected against surging. Surging refers to
Sudden decreases of discharge flow because of too much high discharge pressure
39
Pressure ratio in gas turbines is the ratio of-
highest pressure to exhaust pressure
40
The effective power of gas turbines is increased by adding the following in compressor-
ammonia and water vapour
41
Intercooling in gas turbine results in -
increase in net output but decreases in thermal efficiency
42
Which of the following is a type of Gas Turbine Plant ?
Open
43
In a single stage open cycle gas turbine the mass flow through the turbine is higher than the mass flow through compressor because,
the combustion of fuel takes place in the combustion chamber
44
Use of maximum pressure ratio corresponding to maximum to minimum cycle temp ratio in case of Joule cycle gives which one of the following?
Maximum efficiency but very less specific work output
45
Brayton cycle with infinite intercooling and reheating stages would approximate a -
Ericsson cycle
46
Which of the following cycles are employed in ships and submarines-
Closed Brayton cycle
47
Arrange, Otto cycle, Brayton cycle and Rankine cycle in increasing order of maximum temp reached -
Otto > Brayton > Rankine
48
Arrange the following order in increasing order of pressure ratio -
Rankine > Otto > Brayton
49
Which of the following are effect of regeneration in a gas cycle? 1. Net work output increases 2. Both heat supplied and heat rejected decreases 3. These is an increases in mean temperature of heat addition 4. There is a decrease in cycle efficiency Select the correct one-
2, 3
50
Which one of the following is the correct statement? In a two stage gas turbine plant with inter-cooling and reheating
work ratio improves but thermal efficiency decreases
51
Which of the following statement correctly give the effects of intercooling? 1. Decrease in compressor work input 2. Increase in turbine work output 3. For the plant of fixed power output, it reduces the size of plant 4. Increases in efficiency Select the correct one
1, 3
52
Identify the types of Gas turbines _________.
All of the mentioned
53
Gas turbine engines, when compared to Reciprocating engines have ___________.
high power to weight ratio
54
Most preferable Gas turbines are required to be used in ___________.
constant loads
55
Gas turbines work on __________.
Brayton cycle
56
Gas turbine performance majorly depends on __________.
compressor efficiency
57
In a single stage gas turbine, the compressor and turbine are - (OIL 2023)
Integrated
58
A Gas Turbine in which type of combustion plant - (OIL 2023)
Internal
59
Compare to IC Engine, Gas Turbine has -
High Operating RPM
60
Which of the following is not a component of Gas turbine? (OIL 2023)
Crankshaft
61
Which of the following is a component of Gas turbine engine? (OIL 2023)
Compressor
62
The number of compressor/s in a single stage turbine is/are :
1
63
The number of compressor/s in a multistage turbine is/are -
2
64
The speed of a single stage turbine is :
Constant
65
The gear ratio of a single stage turbine is -
high
66
Torque is _______ to speed in a single stage turbine.
proportional
67
The number of gears in a double stage turbine is/are -
few
68
A part of gas turbine is -
All of the above
69
The function of a compressor is -
to increase pressure
70
A type of compressor is -
both
71
The following is fitted between a compressor and turbine -
burner
72
A type of burner is -
all of these
73
Engine receives power from the medium of ______
turbine
74
In case of gas turbines, the gaseous fuel consumption guarantees are based on -
low hear value
75
The impeller type exhauster has ________.
one spindle
76
Which of the following uses compressed air and fuel for power generation? (OIL 2023)
Gas Turbine
77
Compared to Gas Turbine, IC Engine has -
Low operating RPM
78
The compressor ratio for the compressor is always _____ unity.
more than
79
Temperature of gases at the end of compression as compared to exhaust gases in a gas turbine is -
Lower
80
The maximum temperature in a gas turbine is -
700°C
81
The fuel consumption in gas turbine is accounted for by -
Lower heating value
82
The indicated work per unit mass of air delivered is -
Not affected by clearance volume
83
Which of the following plants is smallest and lightest for generating a given amount of power -
Gas turbine plant
84
The work ratio of a simple gas turbine cycle depends on -
All of these
85
Gas turbine blades are given a rake -
In the direction of motion of blades
86
The ideal efficiency of a simple gas turbine depends on -
Pressure ratio
87
There is a certain Pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of Pressure ratio for the peak efficiency would-
increase
88
The air power of the compressor is also known as -
Indicated power
89
A machine used to raise the pressure of air is called-
Compressor
90
The weight per horse power ratio for gas turbine as compared to IC engine and steam turbine is -
lower
91
Gas turbine as compared to steam turbine-
All of these
92
Water is injected in gas turbine cycle to -
Control output of turbine
93
A closed cycle gas turbine works on -
Joule cycle
94
Gas turbine cycle with regenerator -
increases thermal efficiency
95
The ratio of the net work obtained from the gas turbine plant to the turbine work is known as -
work ratio
96
The thermal efficiency of a gas turbine as compared to a diesel plant is -
less
97
In a closed cycle gas turbine, the air is compressed -
isentropically
98
Gas turbine for power generation are normally used -
to supply peak load requirements
99
Work ratio of a gas turbine may be improved by -
D. Both A and C
100
The gas in cooling chamber of a closed cycle gas turbine is cooled at -
Constant pressure