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Mechanical Engineering
Gas Turbines
Quiz 1
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Q.1
In a jet engine, the air-fuel ratio is
30:1
40:1
50:1
60:1
Q.2
Free air is the air at
Atmospheric conditions at any specific location
20°C and 1 kg/cm² and relative humidity of 36%
0°C and standard atmospheric conditions
15°C and 1 kg/cm²
Q.3
Standard air is the air at
Atmospheric conditions at any specific location
20°C and 1 kg/cm² and relative humidity 36%
0°C and standard atmospheric conditions
15°C and 1 kg/cm²
Q.4
In a double acting compressor, the air is compressed
In one cylinder
In two cylinders
In a single cylinder on both sides of the piston
In two cylinders on both sides of the piston
Q.5
Gas turbine works on
Brayton or Atkinson cycle
Carnot cycle
Rankine cycle
Ericsson cycle
Q.6
An aftercooler is used to
remove impurities from air
reduce volume of air
cause moisture and oil vapour to drop out
cool the air
Q.7
The overall efficiency of the compressed air system is the
Ratio of shaft output of the air motor to the shaft input to the compressor
Ratio of shaft input to the compressor to the shaft output of air motor
Product of shaft output of air motor and shaft input to the compressor
None of the above
Q.8
The air power of the compressor is also known as
Indicated power
Brake power
Frictional power
None of these
Q.9
Which of the following plants is smallest and lightest for generating a given amount of power?
Gas turbine plant
Petrol engine
Diesel engine
Solar plant
Q.10
Which of the following plants is smallest and lightest for generating a given amount of power?
Gas turbine plant
Petrol engine
Diesel engine
Solar plant
Q.11
The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the
rotor to static enthalpy rise in the stator
stator to static enthalpy rise in the rotor
rotor to static enthalpy rise in the stage
stator to static enthalpy rise in the stage
Q.12
In a reciprocating air compressor, the compression work per kg of air
increases as clearance volume increases
decreases as clearance volume increases
is independent of clearance volume
increases as clearance volume decreases
Q.13
An axial compressor gives optimum performance at high speeds and large volume flows.
Agree
Disagree
Q.14
The increase in pressure in a roots blower is entirely due to back flow of air.
Agree
Disagree
Q.15
If pis the pressure of air entering the L.P. cylinder and p2 is the pressure of air leaving the L.P. cylinder (or intercooler pressure), then the ratio of cylinder diameters for a single acting, two stage reciprocating air compressor with complete intercooling is given by (where D1 = Dia. of L.P. cylinder, and D2 = Dia. of H.P. cylinder)
D1/D2 = p1p2
D1/D2 = p1/p2
D1/D2 = p2/p1
none of these
Q.16
The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
compressor efficiency
volumetric efficiency
isothermal efficiency
mechanical efficiency
Q.17
High air-fuel ratio in gas turbines
increases power output
improves thermal efficiency
reduces exhaust temperature
do not damage turbine blades
Q.18
The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.
more
less
Q.19
The compression ratio in a gas turbine is
4
1
9
12
Q.20
The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
Yes
No
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