Efficiency of rankine cycle can be increased by :
A. decreasing initial steam pressure and temperature
B. increasing exhaust pressure
C. decreasing exhaust pressure
D. increasing the expansion ratio
E. increasing number of regenerative heaters
Alkaline pyrogallate is used in Orsat’s apparatus for absorption of :
A. C02
B. CO
C. 02
D. N2
E. none of the above
Hygrometery deals with the :
A. Hygroscopic substances
B. water vapour in air
C. temperature of air
D. pressure of air
E. density measurement
The increase in pressure :
A. lowers the boiling point of a liquid
B. raises the boiling point of a liquid
C. .does not affect the boiling point of a liquid
D. reduces its volume
E. none of the above
Water boils when its vapour pressure :
A. equals that of the surroundings
B. equals 760 mm of mercury
C. equals to atmospheric pressure
D. equals the pressure of water in the container
E. boiling has nothing to do
The state of vapour under saturation condition is described by :
A. pressure alone
B. temperature alone
C. pressure and temperature
D. pressure and dryness fraction
E. dryness fraction alone
Heating wet steam at constant temperature is heating it at constant :
A. volume
B. pressure
C. entropy
D. enthalpy
E. none of the above
At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is :
A. maximum
B. minimum
C. zero
D. depends on temperature also
E. none of the above
Latent heat of dry steam at atmospheric pressure is equal to :
A. 539 kcal/kg
B. 539 BTU/lb
C. 427 kcal/kg
D. 100 kcal/kg
E. 471 kcal/kg
In a throttling process :
A. heat transfer takes place
B. work is done by the expanding steam
C. internal energy of steam changes
D. all of the above
E. none of the above
