Assam coals suffers mainly from the disadvantage of high __________ content.

'Fat coals' are those coals which have very high

A

Caking capacity

B

Volatile matter content

C

Fusion point of its ash

D

Inherent moisture content

Underfeed stokers work best for __________ coals high in volatile matter and with caking tendency

A

Anthracite

B

Lignite

C

Semi-bituminous and bituminous

D

All of the above

Use of water as a manometric liquid suffers from the disadvantage of its

A

Low vapour pressure

B

Corrosive nature

C

High vapour pressure

D

High boiling point

A batch reactor suffers from following disadvantage.

A

Poor product quality control

B

High labour and handling cost

C

High shutdown time requirement for emptying, cleaning and refilling

D

All of the above

Batch tray dryers suffers from the disadvantage of

A

High maintenance cost

B

Non-uniform & low production rate

C

High labour cost & low heat economy

D

All of the above

Aluminium as a material of construction suffers from the disadvantage of

A

Very high cost

B

Rather low tensile strength

C

Very low strength to weight ratio

D

Scarce availability

High ash coals

A

Are soft & friable (poor strength and size stability)

B

Require longer time of carbonisation as ash offers resistance to heat transfer

C

Produce larger quantity of coke oven gas

D

None of these

Very __________ coals are completely devoid of cokability i.e, it is non coking.

A

Young

B

Mature

C

Both A & B

D

Neither A nor B

To carry coals to new castle- এর বাংলা কি

A

ঝোপ বুঝে কোপ মারা

B

কাঁচা বাঁশে ঘুন ধরা

C

তেলা মাথায় তেল দেওয়া

D

কয়লা ধুলে ময়লা যায় না

Carring coals to new castle - এর ঠিক অর্থ

A

যার আছে তাকেই দেওয়া

B

অর্থহীন সাহায্য

C

বিপদের সাহায্য করা

D

কয়লা খনিতে কয়লা পাঠানো

Assam coals suffers mainly from the disadvantage of high __________ content.

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