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13.

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



14.

Fire tube boilers are those in which                        
A. flue gases pass through tubes and water around it B. water passes through the tubes and flue gases around it
C. forced circulation takes place D. tubes are laid vertically



15.

For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is                        
A. 1 kg B. 4/3kg
C. 8/3kg D. 2 kg




16.

Hard coke is produced by carborisation of coal at                        
A. atmospheric temperature B. 500-600°C
C. 70O-850°C D. 95O-1100°C



17.

Heating wet steam at constant temperature is heating it at constant                        
A. volume B. pressure
C. entropy D. enthalpy



18.

Hygrometery deals with the                        
A. Hygroscopic substances B. water vapour in air
C. temperature of air D. pressure of air



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