It allows maximum compression to be achieved
It greatly affects volumetric efficiency
It results in minimum work
It permits isothermal compression
B. It greatly affects volumetric efficiency
Increase in net output but decrease in thermal efficiency
Increase in thermal efficiency but decrease in net output
Increase in both thermal efficiency and net output
Decrease in both thermal efficiency and net output
Equal to
Less than
More than
None of these
1.03 kg/cm²
1.06 kg/cm²
1.00 kg/cm²
0.53 kg/cm²
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
Large quantity of air at high pressure
Small quantity of air at high pressure
Small quantity of air at low pressure
Large quantity of air at low pressure
Radial component
Axial component
Tangential component
None of the above
3.5 : 1
5 : 1
8 : 1
12 : 1
Less
More
Same
May be less or more depending on ambient conditions
To cool the air during compression
To cool the air at delivery
To enable compression in two stages
To minimise the work of compression
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
Both the arrangements can be employed
All are connected in series
Remain same
Decrease
Increase
None of the above
Equal to
Double
Three times
Six times
Centrifugal compressors deliver practically constant pressure over a considerable range of capacities
Axial flow compressors have a substantially constant delivery at variable pressures
Centrifugal compressors have a wider stable operating range than axial flow compressors
Axial flow compressors are bigger in diameter compared to centrifugal type
Cools the delivered air
Results in saving of power in compressing a given volume to given pressure
Is the standard practice for big compressors
Enables compression in two stages
p₂/p₁ = p₃/p₂
p₁/p₃ = p₂/p₁
p₁ = p₃
p₁ = p₂ p₃
Reduced
Increased
Zero
None of these
High nickel alloy
Stainless steel
Carbon steel
High alloy steel
Gas turbine requires lot of cooling water
Gas turbine is capable of rapid start up and loading
Gas turbines has flat efficiency at part loads
Gas turbines have high standby losses and require lot of maintenance
34 %
50 %
60 %
72 %
Before intercooler
After intercooler
After receiver
Between after-cooler and air receiver
Centrifugal type
Reciprocating type
Lobe type
Axial flow type
Increases
Decreases
Remain constant
First decreases and then increases
Pressure ratio
Maximum cycle temperature
Minimum cycle temperature
All of the above
Zero
Less
More
Same
The reciprocating compressors are best suited for high pressure and low volume capacity
The effect of clearance volume on power consumption is negligible for the same volume of discharge
Both (A) and (B)
None of these
3 m³/ mt.
1.5 m³/ mt.
18 m³/ mt.
6 m³/ mt.
Slip factor
Velocity factor
Velocity coefficient
None of the above
Less
More
Same
More/less depending on compressor capacity
Less
More
Same
May be less or more depending upon speed