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91.

The vacuum required in vacuum distillation of reduced crude oil is of the order of

A.	1.2 mm Hg	B.	120 mm Hg
C.	700 mm Hg	D.	740 mm Hg

92.

The primary purpose of visbreaking process is

A.	To increase viscosity and pour point	B.	in reduce viscosity and pour point
C.	to increase viscosity and reduce pour point	D.	to reduce viscosity and increase pour point

93.

Zeolite catalyst

A.	are crystalline alumino-silicates	B.	have high activity than synthetic amorphous catalyst
C.	are used in catalytic cracking of heavy vacuum gas oils	D.	all of the above

94.

Crude petroleum distillation is carried out at pressure

A.	slightly below atmospheric pressure	B.	slightly above atmospheric pressure
C.	above 5 atm	D.	above 15 atm

95.

Which of the following solvents is used to extract aromatics from lube distillates and deasphalted oil?

A.	Methyl ethyl ketone	B.	Methyl isobutyl ketone
C.	Furfural	D.	Aluminium chloride

96.

The solvent used in the dewaxing of the waxy oil feed is

A.	liquid sulphur trioxide	B.	composed of methyl ethyl ketone and toluene
C.	composed of triethylene glycol and water	D.	platinum

97.

Sulfolane is

A.	Ethyl mercaptan	B.	thiophene
C.	tetrahydrothiophene dioxide	D.	methyl mercaptan

98.

In sweetening MEROX process for kersine the mercaptans are converted into

A.	disulphides	B.	sulphur
C.	hydrogen sulphide	D.	all of the above

99.

Sodium plumbite has the chemical formula

A.	NaPbO2	B.	Na2PbO
C.	Na2PbO2	D.	Na4PbO

100.

The doctor solution consists of sodium plumbite in

A.	aqueous caustic soda	B.	soda ash
C.	water	D.	ethanol