Related Questions

When the temperature of air leaving the inter-cooler, in a two stage compression with inter-cooler, is ________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
A Equal to
B Less than
C More than
D None of these
Centrifugal compressors compared to reciprocating compressors
A Require less space
B Have quieter operation
C Have lower operating costs
D All of the above
Multistage compressors are used in industry, because they
A Reduce the cost of compressor
B Reduce the size requirement
C Resemble closely to isothermal compression
D Are easy to control
In a single casing, multistage pump running at constant speed, the capacity rating is to be slightly lowered. It can be done by
A Designing new impeller
B Trimming the impeller size to the required size by machining
C Not possible
D Some other alterations in the impeller
For perfect intercooling in a three stage compressor
A $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_3}}}$$
B $$\frac{{{{\text{p}}_3}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_4}}}{{{{\text{p}}_2}}}$$
C $${{\text{p}}_1}{{\text{p}}_2} = {{\text{p}}_3}{{\text{p}}_4}$$
D $${{\text{p}}_1}{{\text{p}}_3} = {{\text{p}}_2}{{\text{p}}_4}$$
For perfect intercooling in a two stage compressor
A $$\frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}} = \frac{{{{\text{p}}_3}}}{{{{\text{p}}_2}}}$$
B $$\frac{{{{\text{p}}_1}}}{{{{\text{p}}_3}}} = \frac{{{{\text{p}}_2}}}{{{{\text{p}}_1}}}$$
C $${{\text{p}}_1} = {{\text{p}}_3}$$
D $${{\text{p}}_1} = {{\text{p}}_2}{{\text{p}}_3}$$
Intercooling in gas turbines
A Decreases net output but increases thermal efficiency
B Increases net output but decreases thermal efficiency
C Decreases net output and thermal efficiency both
D Increases net output and thermal efficiency both
Rotary compressors are suitable for
A Large discharge at high pressure
B Low discharge at high pressure
C Large discharge at low pressure
D Low discharge at low pressure
The motor used for the compressors is
A d.c. series motor
B shaded pole motor
C capacitor-start capacitor-run motor
D reluctance motor
Rotary compressors are used for delivering
A Small quantities of air at high pressures
B Large quantities of air at high pressures
C Small quantities of air at low pressures
D Large quantities of air at low pressures

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