To accommodate Valves in the cylinder head
To provide cushioning effect
To attain high volumetric efficiency
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
D. To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
1 : 1.2
1 : 2
1 : 5
1 : 10
Lowest
Highest
Anything
Atmospheric
Conversion of pressure energy into kinetic energy
Conversion of kinetic energy into pressure energy
Centripetal action
Generating pressure directly
Compresses 3 m³/min of standard air
Compresses 3 m³/ min of free air
Delivers 3 m³/ min of compressed air
Delivers 3 m³/ min of compressed air at delivery pressure
Closed cycle gas turbine is an I.C engine
Gas turbine uses same working fluid over and over again
Ideal efficiency of closed cycle gas turbine plant is more than Carnot cycle efficiency
Thrust in turbojet is produced by nozzle exit gases.
Slip factor
Velocity factor
Velocity coefficient
None of the above
Low speeds
High speeds
Low altitudes
High altitudes
kg/m²
kg/m³
m³/min
m³/kg
Decrease
Increase
Remain same
Does not change
Thrust power and fuel energy
Engine output and propulsive power
Propulsive power and fuel input
Thrust power and propulsive power
Higher
Lower
Same
None of the above
Mass flow rate
Pressure ratio
Change in load
Stagnation pressure at the outlet
Parallel
Perpendicular
Inclined
None of these
Before the intercooler
After the intercooler
Between the aftercooler and receiver
Before first stage suction
700°C
2000°C
1500°C
1000°C
Work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
Isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Volume of free air delivery per stroke to the swept volume of the piston
Isentropic power to the power required to drive the compressor
Turbojet
Turbo-propeller
Rocket
Ramjet
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
High nickel alloy
Stainless steel
Carbon steel
High alloy steel
Isothermal h.p. to the BHP of motor
Isothermal h.p. to adiabatic h.p.
Power to drive compressor to isothermal h.p.
Work to compress air isothermally to work for actual compression
Throttle control
Clearance control
Blow off control
Any one of the above
One adiabatic, two isobaric, and one constant volume
Two adiabatic and two isobaric
Two adiabatic, one isobaric and one constant volume
One adiabatic, one isobaric and two constant volumes
Same
Lower
Higher
None of these
Ammonia and water vapour
Carbon dioxide
Nitrogen
Hydrogen
3.5 : 1
5 : 1
8 : 1
12 : 1
Equal to
Double
Three times
Six times
More
Less
Same
Depends on other factors
Vacuum
Atmospheric air
Compressed air
Oxygen alone
No flow of air
Fixed mass flow rate regardless of pressure ratio
Reducing mass flow rate with increase in pressure ratio
Increased inclination of chord with air steam
2 kg/cm²
6 kg/cm²
10 kg/cm²
14.7 kg/cm²