Chemical Engineering Basics

Question: Window panes of aeroplanes are normally made of
[A].

perspex (PMMA)

[B].

teflon (PTFE)

[C].

bakelite (phenol formaldehyde)

[D].

polystyrene

Answer: Option A

Explanation:

No answer description available for this question.

Question: __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
[A].

Beryllia

[B].

Zirconia

[C].

Alumina

[D].

Magnesia

Answer: Option C

Explanation:

No answer description available for this question.

Question: Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.
[A].

film

[B].

nucleate

[C].

transition

[D].

all modes of

Answer: Option A

Explanation:

No answer description available for this question.

Question: Out of the following surfaces, the emis-sivity will be minimum for
[A].

aluminium foil

[B].

concrete

[C].

plaster

[D].

smooth glass

Answer: Option B

Explanation:

No answer description available for this question.

Question: Material having negative co-efficient of linear expansion is
[A].

copper

[B].

aluminium

[C].

rubber

[D].

nickel

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
[A].

Calcium

[B].

Nitrogen

[C].

Phosphorous

[D].

Hydrogen

Answer: Option B

Explanation:

No answer description available for this question.

Question: If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?
[A].

7

[B].

< 7

[C].

> 7

[D].

0

Answer: Option C

Explanation:

No answer description available for this question.

Question: Melting point & boiling points of liquid oxygen are respectively – 218.8°C & – 183°C, while the same for liquid nitrogen is – 210°C & – 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
[A].

°C

[B].

°F

[C].

°K

[D].

°R

Answer: Option B

Explanation:

No answer description available for this question.

Question: Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton’s law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
[A].

[B].

[C].

[D].

Answer: Option C

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.