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61.

Select the wrong statement

A.	The aromatics have higher octane number than naphthenes with same number of carbon atoms	B.	Branched chain paraffins have higher octane number than straight chain paraffins with same number of carbon atoms
C.	Octane number of paraffins decreases with increasing number of carbon atoms	D.	Octane number of n-octane is 100

62.

Arrange the following hydrocarbons series in the increasing order of octane number for the same carbon atoms (i) Paraffins (P) (ii) Naphthenes (N) (iii) Aromatics(A)

A.	P N A	B.	A N P
C.	A P N	D.	N A P

63.

Arrange the following hydrocarbons series in the increasing order of knock rating for the same carbon atoms (i) Paraffins (P) (ii) Naphthenes (N) (iii) Aromatics(A)

A.	A N P	B.	P N A
C.	N A P	D.	A P N

64.

Antiosidants are added in gasoline

A.	to minimize gum formation	B.	to prevent icing of the carburettor
C.	to prevent the build-up of lead in engines	D.	for identification

65.

The dielectric constant of petroleum products is

A.	less than that of porcelain	B.	more than that of porcelain
C.	zero	D.	equal to or more than that of porcelain

66.

Select the correct order of increasing effect of TEL on octane number

A.	Olefins aromatics naphthenes paraffins	B.	Aromatics naphthenes olefins paraffins
C.	Paraffins naphthenes aromatics olefins	D.	Paraffins olefins naphthenes armatics

67.

Arrange the following hydrocarbons series in the increasing order of specific heat for the same carbon atoms 1. Paraffins 2. Naphthenes 3. Aromatics

A.	paraffins Naphthenes Aromatics	B.	Aromatics Naphthenes Paraffins
C.	Naphthenes Paraffins Aromatics	D.	Naphthenes Aromatics Paraffins

68.

Which of the following hydrocarbons are the most desirable in kerosine?

A.	Paraffins	B.	Isoparaffins
C.	Naphthenes	D.	Armatics

69.

Smoking tendency of hydrocarbons of same carbon atoms present in kerosine is maximum for

A.	Isoparaffins	B.	Naphthenes
C.	Aromatics	D.	Paraffins

70.

Smoking tendency of hydrocarbons of same carbon atoms present in kerosine is minimum for

A.	Isoparaffins	B.	Paraffins
C.	Aromatics	D.	Naphthenes