Vacuum
Atmospheric air
Compressed air
Oxygen alone
C. Compressed air
Lower at low speed
Higher at high altitudes
Same at all altitudes
Higher at high speed
Slip factor
Velocity factor
Velocity coefficient
None of the above
Increase of work ratio
Decrease of thermal efficiency
Decrease of work ratio
Both (A) and (B) above
Centrifugal pump
Reciprocating pump
Turbine
Sliding vane compressor
Large discharge at high pressure
Low discharge at high pressure
Large discharge at low pressure
Low discharge at low pressure
Equal to
Less than
More than
None of these
Isentropic compression
Isothermal compression
Polytropic compression
None of the above
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
Standard air
Free air
Compressed air
Compressed air at delivery pressure
Turbojet engine
Ramjet engine
Propellers
Rockets
Gas turbine uses low air-fuel ratio to economise on fuel
Gas turbine uses high air-fuel ratio to reduce outgoing temperature
Gas turbine uses low air-fuel ratio to develop the high thrust required
All of the above
Forward curved
Backward curved
Radial
None of these
Brayton or Atkinson cycle
Rankine cycle
Carnot cycle
Erricson cycle
Same
Lower
Higher
None of these
Carries its own oxygen
Uses surrounding air
Uses compressed atmospheric air
Does not require oxygen
Atmospheric
Slightly more than atmospheric
Slightly less than atmospheric
Pressure slightly less than atmospheric and temperature slightly more than atmospheric
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
Surrounding air
Compressed atmospheric air
Its own oxygen
None of these
0.1 to 1.2 m³/s
0.15 to 5 m³/s
Above 5 m³/s
None of these
Adiabatic temperature drop in the stage
Total temperature drop
Total temperature drop in the stage
Total adiabatic temperature drop
Jet velocity
Twice the jet velocity
Half the jet velocity
Average of the jet velocity
0.1 bar and 20°C
1 bar and 20°C
0.1 bar and 40°C
1 bar and 40°C
Equal to zero
In the direction of motion of blades
Opposite to the direction of motion of blades
Depending on the velocity
Pressure drop across the valves
Superheating in compressor
Clearance volume and leakages
All of these
D₁/D₂ = p₁ p₂
D₁/D₂ = p₁/p₂
D₁/D₂ = p₂/p₁
None of these
10 to 40 %
40 to 60 %
60 to 70 %
70 to 90 %
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
Inlet whirl velocity
Outlet whirl velocity
Inlet velocity of flow
Outlet velocity of flow
Gas turbine is a self starting unit
Gas turbine does not require huge quantity of water like steam plant
Exhaust losses in gas turbine are high due to large mass flow rate
Overall efficiency of gas turbine plant is lower than that of a reciprocating engine
Radial flow
Axial flow
Centrifugal
None of the above