Hygrometery deals with the_________________?
(A) Hygroscopic substances
(B) water vapour in air
(C) temperature of air
(D) pressure of air
(D) 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
(D) none of the above
Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?
(A) and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2
(B) and its corresponding conversion into dry steam at desired boiler pressure
(C) conversion into steam at atmospheric condition
(D) conversion into steam at the same pres-sure at which feed water is supplied
(D) 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
(D) boiling has ^nothing to do with vapour pressure
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
(D) dryness fraction alone
Heating wet steam at constant temperature is heating it at constant_________________?
(A) volume
(B) pressure
(C) entropy
(D) enthalpy
(D) none of the above
In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?
(A) 40%
(B) 25%
(C) 50%
(D) 80%
(D) 90%
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
(D) none of the above
Latent heat of dry steam at atmospneric pressure is equal to____________________?
(A) 539 kcal/kg
(B) 539 BTU/lb
(C) 427 kcal/kg
(D) 100 kcal/kg
(D) 471 kcal/kg
Which of the following is a fire tube boiler________________?
(A) locomotive boiler
(B) Babcock and Wilcox boiler
(C) Stirling boiler.
(D) all of the above
(D) none of the above