Chemical Engineering Basics

Question: Catalyst used in the ‘catalytic converter’ employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is
[A].

alumina

[B].

platinum

[C].

vanadium pentoxide

[D].

iron oxide

Answer: Option B

Explanation:

No answer description available for this question.

Question: Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?
[A].

enthalpy

[B].

relative humidity

[C].

wet bulb temperature

[D].

dew point temperature

Answer: Option D

Explanation:

No answer description available for this question.

Question: The best lubricants for a machine working at high temperature & load is
[A].

grease

[B].

solid lubricant

[C].

animal oils

[D].

mineral oils

Answer: Option B

Explanation:

No answer description available for this question.

Question: A suitable lubricant used for watches is
[A].

metallic soap solution

[B].

grease

[C].

palm oil

[D].

hazel-nut oil

Answer: Option D

Explanation:

No answer description available for this question.

Question: __________ is a non volatile film forming constituent of a paint.
[A].

Thinner

[B].

Dryer

[C].

Drying oil

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Electrochemical corrosion can occur, only if __________ is present in contact with metal.
[A].

air

[B].

oxygen

[C].

liquid medium

[D].

gaseous medium

Answer: Option C

Explanation:

No answer description available for this question.

Question: Ceramic tips for the cutting tool are prepared from __________ powder.
[A].

carbon

[B].

silicon carbide

[C].

aluminium oxide

[D].

tungsten

Answer: Option C

Explanation:

No answer description available for this question.

Question: Heating of an ore below its melting point in presence of excess of air is called
[A].

calcination

[B].

smelting

[C].

roasting

[D].

sublimation

Answer: Option C

Explanation:

No answer description available for this question.

Question: Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with
[A].

vanadium & chromium

[B].

silicon

[C].

tungsten

[D].

manganese

Answer: Option A

Explanation:

No answer description available for this question.

Question: Drills are usually made of
[A].

cermets

[B].

high speed steel

[C].

alloy steel

[D].

tungsten carbide

Answer: Option B

Explanation:

No answer description available for this question.