Engineering :: Fuels and Combustion

@ : Home > Chemical Engineering > Fuels and Combustion

71.

The hydrogen free combustible gas is

A.	CO2	B.	O2
C.	N2	D.	CO

72.

The per cent difference between lower heating value and higher heating value is maximum in the case of

A.	hydrogen	B.	LPG
C.	Natural gas	D.	carbon

73.

H/C ratio (by weight) is infinite for

A.	carbon	B.	hydrogen
C.	methane	D.	gobar gas

74.

H/C ratio (by weight) is zero for

A.	carbon	B.	hydrogen
C.	methane	D.	Gobar gas

75.

A paraffinic hydrocarbon liquid fuel has a C/H ration (by weight) of 5.1428. Its chemical formula is

A.	C8H18	B.	C7H16
C.	C6H14	D.	C2H12

76.

The fuel ratio of coal is defined as the ratio of

A.	its percentage fixed carbon to that of ash	B.	its percentage fixed carbon to that of volatile matter
C.	its percentage fixed carbon to that of moisture	D.	percentage carbon to that of hydrogen obtained in the ultimate analysis of coal.

77.

H/C ration (by weight) for the same number of carbon atoms is the highest in the

A.	paraffins	B.	naphthenes
C.	olefins	D.	aromatics

78.

H/C ratio (by weight) for the same number of carbon atoms is the lowest in the

A.	paraffins	B.	naphthenes
C.	olefins	D.	aromatics

79.

Select the correct statement

A.	Gaseous fuels are ideal from the standpoint of complete combustion	B.	Liquid fuels are ideal from the standpoint of complete combustion
C.	Solid fuels are ideal from the standpoint of complete combustion	D.	Liquid as well as solid fuels are ideal from the standpoint of complete combustion

80.

Heating value of gaseous fuels in Btu/cu. Ft.

A.	decreases with increase in molecular weight	B.	increases with increase in molecular weight
C.	remains constant with change in molecular weight	D.	is always negative