Fuels and Combustion

Question: Yield of pitch from distillation of high temperature tar is around __________ percent.
[A].

10

[B].

25

[C].

65

[D].

90

Answer: Option C

Explanation:

No answer description available for this question.

Question: Benzol is used
[A].

as a motor fuel blend.

[B].

for producing benzene, tolune & xylene by its distillation.

[C].

both (a) & (b).

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Hard pitch is used for making
[A].

pulverised fuel

[B].

perfumes

[C].

insecticides

[D].

plastics

Answer: Option A

Explanation:

No answer description available for this question.

Question: Benzene is used
[A].

as a motor fuel.

[B].

as an explosive.

[C].

for making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR).

[D].

as a perfume.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Coke oven gas is stripped of its H2S and mercaptans content by
[A].

absorption in wash oil.

[B].

adsorption on bog iron bed.

[C].

bubbling it through dilute sulphuric acid.

[D].

adsorption on silica gel.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Main constituents of benzol are
[A].

benzene, toluene & xylene.

[B].

tar & creosote.

[C].

ammonia & phenol.

[D].

anthracene & phenol.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Ionisation potential applied across the electrodes of electrostatic tar precipitator is around
[A].

230 V AC

[B].

60 KV AC

[C].

230 V DC

[D].

60 KV DC

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increase in the temperature of carbonisation of coal
[A].

hydrogen content of coke oven gas increases due to cracking of hydrocarbons.

[B].

methane content in the coke oven gas decreases and carbon monoxide content increases.

[C].

calorific value of the coke oven gas decreases due to cracking of hydrocarbons which is not compensated by increase in CO & H2 content.

[D].

all (a), (b) and (c)

Answer: Option D

Explanation:

No answer description available for this question.

Question: Caking index of a coal is a measure of its
[A].

abradability

[B].

reactivity

[C].

agglutinating (binding) properties

[D].

porosity

Answer: Option C

Explanation:

No answer description available for this question.

Question: Height of coke oven is limited (say maximum upto 7 metres) mainly by the
[A].

problem of uniform heating along its height.

[B].

structural strength of silica bricks.

[C].

problem in door cleaning.

[D].

buckling of ram of pusher car at the time of coke pushing.

Answer: Option A

Explanation:

No answer description available for this question.