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Question: A sooty flame can be made non-luminous by
[A].

admitting more gas.

[B].

shutting gas supply.

[C].

admitting more air.

[D].

shutting air supply.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Coal tar (produced by high temperature carbonisation) is the main source of
[A].

aromatic compounds

[B].

alphatic compounds

[C].

paraffins

[D].

olefins

Answer: Option A

Explanation:

No answer description available for this question.

Question: Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as
[A].

M = 1.8 A

[B].

M = 0.5 A

[C].

M = 1.1 A

[D].

M = A

Answer: Option C

Explanation:

No answer description available for this question.

Question: For long flame and easy ignition, the coal used should have
[A].

high volatile matter

[B].

low ash

[C].

high calorific value

[D].

high ash

Answer: Option A

Explanation:

No answer description available for this question.

Question: Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called
[A].

back draughting.

[B].

banking.

[C].

under pressurising.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: ‘Fat’ coal means a coal having
[A].

low calorific value.

[B].

high volatile matter,

[C].

low ash content.

[D].

non smoking tendency.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mott and Wheeler test is conducted on coke to find its
[A].

reactivity with O2.

[B].

abradability.

[C].

phosphorus content.

[D].

volatile matter content.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
[A].

<120

[B].

>120

[C].

<90

[D].

90-110

Answer: Option B

Explanation:

No answer description available for this question.