Engineering :: Fuels and Combustion

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61.

The cuprous chloride solution absorbs

A.	CO2 only	B.	O2 only
C.	CO only	D.	CO2 O2 and CO

62.

Incomplete combustion of hydrocarbon fuels may be due to

A.	presence of high percentage of carbon monoxide in the flue-gas	B.	a smoky stack
C.	increased fuel consumption for the same heating requirement	D.	all these answers

63.

Too much excess air gives

A.	high percentages of O2 in the flue gas	B.	high stack temperature
C.	increased fuel consumption for the same heating requirement	D.	all these answers

64.

The correct amount of excess air is the amount that gives

A.	the maximum fuel consumption for the given requirement	B.	the high percentages of O2 in the flue gas
C.	the high stack temperature	D.	the most efficient furnance operation and the minimum fuel consumption for the given heating requirement

65.

At the organic liquids are combustible except

A.	benzene	B.	carbon tetrachloride
C.	toluene	D.	cyclohexane

66.

Which of the three types of fuels offer the highest heating values?

A.	gaseous fuels	B.	liquid fuels
C.	solid fuels

67.

The ultimate analysis of coal gives

A.	carbon hydrogen and ash	B.	volatile matter moisture ash and fixed carbon
C.	carbon hydrogen sulphur and nitrogen	D.	volatilematter mositure nitrogen and fixed carbon

68.

The proximate analysis of coal gives

A.	carbon hydrogen and ash	B.	volatile matter moisture ash and fixed carbon
C.	carbon hydrogen sulphur and nitrogen	D.	volatilematter mositure nitrogen and fixed carbon

69.

The ration of the percentage carbon obtained in the ultimate analysis and the per cent fixed carbon obtained in the proximate analysis is always

A.	one	B.	less than one
C.	greater than one

70.

Heating value of liquid fuels in Btu/1b

A.	decreases with decrease in specific gravity	B.	increases with decrease in specific gravity
C.	remains constant with change in specific gravity	D.	increases with decrease in degree API.