A. Increases
B. Decreases
C. Remain same
D. May increase or decrease (depends on the suction pressure)
Related Mcqs:
- Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
A. +4000
B. -4000
C. 10000
D. -10000 - 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 A , B. & C. - In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70 - __________________ of air does not increase with increase in temperature?
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity - Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about ____________________?
A. 9 : 1
B. 17 : 1
C. 23 : 1
D. 29 : 1 - Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be________________?
A. 9.5 : 1
B. 12.5 : 1
C. 15.5 : 1
D. 18.5 : 1 - 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. Y = Cp/Cv - Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that_________________?
A. Pure oxygen has been used for combustion
B. Nitrogen percentage in the fuel is very high
C. Excess air has been used for combustion
D. Hydrogen is not present in the fuel - In case of a, centrifugal pump, the ratio h1/h2 is termed as the _____________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)?
A. Mechanical
B. Overall
C. Volumetric
D. Impeller - If the head is doubled in & centrifugal pump, the power required will increase in the ratio of__________________?
A. 23
B. 23/2
C. 25/2
D. 21/3
