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Mechanical Engineering
Gas Turbines
Quiz 2
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Q.1
When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
equal to
less than
more than
Q.2
Intercooling in gas turbines
decreases net output but increases thermal efficiency
increases net output but decreases thermal efficiency
decreases net output and thermal efficiency both
increases net output and thermal efficiency both
Q.3
A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
same
lower
higher
Q.4
A large clearance Volume in a reciprocating compressor results in
reduced volume flow rate
increased volume flow rate
lower suction pressure
lower delivery pressure
Q.5
In a centrifugal compressor, an increase in speed at a given pressure ratio causes
increase in flow
decrease in flow
increase in efficiency
increase in flow and decrease in efficiency
Q.6
A rotary compressor is driven by an
electric motor
engine
either (a) or (b)
none of these
Q.7
Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
True
False
Q.8
Rotary compressors are used for delivering
small quantities of air at high pressures
large quantities of air at high pressures
small quantities of air at low pressures
large quantities of air at low pressures
Q.9
The efficiency of a jet engine is higher at
low speeds
high speeds
low altitudes
high altitudes
Q.10
The type of rotary compressor used in gas turbines, is of
centrifugal type
axial flow type
radial flow type
none of these
Q.11
In the aircraft propellers
the propulsive matter is ejected from within the propelled body
the propulsive matter is caused to flow around the propelled body
its functioning does not depend upon the presence of air
none of the above
Q.12
For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p2 is given by
p2 = (p1 + p3)/2
p2 = p1.p3
P2 = Pa x p3/p1
p2 = pa p3/p1
Q.13
The inlet pressure is always __________ the discharge pressure.
equal to
less than
more than
Q.14
The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.
Correct
Incorrect
Q.15
The ratio of workdone per cycle to the stroke volume of the compressor is known as
compressor capacity
compression ratio
compressor efficiency
mean effective pressure
Q.16
Intercooling in multi-stage compressors is done
to cool the air during compression
to cool the air at delivery
to enable compression in two stages
to minimise the work of compression
Q.17
The capacity of a compressor is expressed in
kg/m2
kg/m3
m3/min
m3/kg
Q.18
The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air.
Correct
Incorrect
Q.19
An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
Yes
No
Q.20
The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.
True
False
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