Related Questions

The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called
A Humidity ratio
B Relative humidity
C Absolute humidity
D Degree of saturation
In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
A 1
B 1.4
C 1.5
D $$\gamma = \frac{{{{\text{C}}_{\text{p}}}}}{{{{\text{C}}_{\text{v}}}}}$$
The work done in isothermal compression compared to that in adiabatic compression will be
A Less
B More
C Same
D More or less depending upon the extent of work done
In a reciprocating air compressor, the compression work per kg of air
A Increases as clearance volume increases
B Decreases as clearance volume increases
C Is independent of clearance volume
D Increases as clearance volume decreases
Multistage compression of air as compared to single stage compression offers the advantage of
A Power saving per unit weight of air delivered
B Moisture elimination in the inter-stage cooler
C Increased volumetric efficiency
D All of the above
Maximum work is done in compressing air when the compression is
A Isothermal
B Adiabatic
C Polytropic
D None of the above
For minimum work in multistage compression, assuming same index of compression in all stages
A Work done in first stage should be more
B Work done in subsequent stages should increase
C Work done in subsequent stages should decrease
D Work done in all stages should be equal
The indicated work per unit mass of air delivered is
A Directly proportional to clearance volume
B Greatly affected by clearance volume
C Not affected by clearance volume
D Inversely proportional to clearance volume
Heat conducted through per unit area and unit thick face per unit time when temperature difference between opposite faces is unity, is called
A Thermal resistance
B Thermal coefficient
C Temperature gradient
D Thermal conductivity
Six men can complete a work in 5 days if they work for 8 hours per day. How many days will 4 men take to do the same work if they work only 5 hours per day?
A 12
B 16
C 24
D 32

Next steps