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