Temperature during compression remains constant
No heat leaves or enters the compressor cylinder during compression
Temperature rise follows a linear relationship
Work done is maximum
B. No heat leaves or enters the compressor cylinder during compression
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.
Thrust and range of aircraft
Efficiency of the engine
Both (A) and (B)
None of these
Net work output and work done by turbine
Net work output and heat supplied
Work done by turbine and heat supplied
Work done by turbine and net work output
Increases
Decreases
Remain constant
First decreases and then increases
Increases
Decreases
Remain same
First increases and then decreases
Decreasing the compression work
Increasing the compression work
Increasing the turbine work
Both (A) and (C) above
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
Equal to
Less than
More than
None of these
Increase of work ratio
Decrease of thermal efficiency
Decrease of work ratio
Both (A) and (B) above
(v₁² -v₂²)/2g
(v₁ - v₂)²/2g
(v₁² -v₂²)/g
(v₁ - v₂)²/g
Highly heated atmospheric air
Solids
Liquid
Plasma
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
Equal to
Less than
Greater than
None of these
20 - 30 %
40 - 50 %
60 - 70 %
70 - 90 %
Better lubrication is possible advantages of multistage
More loss of air due to leakage past the cylinder
Mechanical balance is better
Air can be cooled perfectly in between
Isothermal compression
Isentropic compression
Polytropic compression
None of these
Isentropic compression
Isothermal compression
Polytropic compression
None of the above
1 to 5 bar
5 to 8 bar
8 to 10 bar
10 to 15 bar
It allows maximum compression to be achieved
It greatly affects volumetric efficiency
It results in minimum work
It permits isothermal compression
Increases
Decreases
Remains same
Increases/decreases depending on compressor capacity
Single stage compression
Multistage compression without intercooling
Multistage compression with intercooling
None of these
Work factor
Slip factor
Degree of reaction
Pressure coefficient
Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
Volume of air delivered by the compressor
Volume of air sucked by the compressor during its suction stroke
None of the above
As large as possible
As small as possible
About 50% of swept volume
About 100% of swept volume
Work done in first stage should be more
Work done in subsequent stages should increase
Work done in subsequent stages should decrease
Work done in all stages should be equal
Backward curved blades has poor efficiency
Backward curved blades lead to stable performance
Forward curved blades has higher efficiency
Forward curved blades produce lower pressure ratio
Less
More
Same
May be less or more depending upon speed
One stroke
Two strokes
Three strokes
Four strokes
Brayton or Atkinson cycle
Carnot cycle
Rankine cycle
Erricson cycle
Increase first at fast rate and then slow
Increase first at slow rate and then fast
Decrease continuously
First increase, reach maximum and then decrease