Which is the most undesirable component in kerosene?

Cavitation in a pump creates so many undesirable effects. Out of the following, which is not an undesirable effect created by cavitation?

A

Decrease in effect

B

Increase in thrust

C

Develops noise

D

Develops high pressure

Which of the following is desirable in petrol (gasoline) but undesirable in kerosene?

A

Paraffins

B

Aromatics

C

Mercaptans

D

Naphthenic acid

Which is the most desirable component of a good quality kerosene?

A

I-paraffins

B

Aromatics

C

N-paraffins

D

Naphthenes

Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.

A

Decreases

B

Decreases exponentially

C

Increases

D

Remains constant

Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

A

Only vapor phase follows Raoult's law

B

Only liquid phase obeys Dalton's law

C

Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law

D

Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

Which of the following is an undesirable characteristics of a refrigerant ?

A

It should be non-explosive

B

It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils

C

Its vapor pressure at the condenser temperature should be very high

D

None of these

Which of the following is an undesirable property in a tower packing?

A

Large surface per unit volume

B

Large free cross-section

C

Low weight per unit volume

D

Large weight of liquid retained

Which of the following reactions is undesirable in the production of catalytically reformed gasoline?

A

Dehydrogenation of naphthene

B

Dehydrogenation of lower paraffins

C

Dehydrocyclisation of higher paraffins

D

Isomerisation of paraffins

The constituent of cement which is responsible for all the undesirable properties of cement is

A

Di-calcium silicate

B

Tri-calcium silicate

C

Tri-calcium aluminate

D

Tetra calcium alumino ferrite

Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?

A

High fusibility & fluidity

B

High thermal conductivity

C

Low density

D

High chemical activity

Which is the most undesirable component in kerosene?

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