Coke used for the production of calcium carbide should have

Commercial production of calcium carbide requires limestone and __________ as raw materials.

A

Coke

B

Sand

C

Soda ash

D

Fuel oil

Reaction of calcium carbide with water produces a gas, which is used

A

As an illuminant

B

For metal cutting/welding

C

Both A & B

D

Neither A nor B

In a group of 60 people, 27 like coke and 42 like borhani and each person likes at least one of the two drinks How many people like both coke and borhani?

A

9

B

129

C

69

D

15

Degree of carbonisation of coal during coke making can be roughly judged by the __________ of the coke produced.

A

Colour

B

Moisture content

C

Ash content

D

Volatile matter

Coke made in narrower by-product coke ovens (as compared to wider ovens) is

A

Less reactive

B

Stronger

C

Smaller in size

D

All of the above

During coal carbonisation process, the conversion of semi-coke to coke is accompanied by an increase in the __________ of the mass.

A

Density

B

Porosity

C

Electrical resistivity

D

None of these

Width of the coke oven towards coke side is slightly more than that on pusher side to

A

Facilitate easy discharging of coke as it swells during carbonisation

B

Facilitate uniform heating of the oven

C

Increase the output of the coke

D

None of these

Narrow coke ovens as compared to wider coke ovens

A

Produce smaller coke

B

Produce stronger coke

C

Require less time of carbonisation

D

All of the above

আদ্র বাতাসের সংস্পর্শে ক্যালশিয়াম কার্বাইড নিম্নের কোন যৌগটি উৎপন্ন করে? (Which of the following compound is produced when calcium carbide gets contact with moist air?)

A

Ethene

B

Ethane

C

Ethyne

D

Ethanal

আর্দ্র বাতাসের সংস্পর্শে ক্যালশিয়াম কার্বাইড নিম্নের কোন যৌগটি উৎপন্ন করে? (Which of the following compound is produced when calcium carbide gets contact with moist air?)

A

Ethene

B

Ethane

C

Ethyne

D

Ethanal

Coke used for the production of calcium carbide should have

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