Combustion of pulverised fuel

Fuels and Combustion
Combustion of pulverised fuel

Requires larger combustion chamber than rich gaseous fuel

All of these

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

Suppresses the discharge of fine dust and grit into atmosphere

Requires larger combustion chamber than rich gaseous fuel

All of these

In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel

Suppresses the discharge of fine dust and grit into atmosphere

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Decreases

Remains same

May increase or decrease ; depends on the type of fuel

Increases

Decreases

Remains same

May increase or decrease ; depends on the type of fuel

Increases

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Fusion point of coal ash increases with increase in its __________ content.

All of these

Lime and magnesia

Iron silicate

Iron sulphate

All of these

Lime and magnesia

Iron silicate

Iron sulphate

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
A coal with high ash content is undesirable, as

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

All of these

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes

All of these

It is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber

The ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

M = 1.1 A

M = 1.8 A

M = 0.5 A

M = A

M = 1.1 A

M = 1.8 A

M = 0.5 A

M = A

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

None of these

Sensible

Latent

Sensible and latent

None of these

Sensible

Latent

Sensible and latent

ANSWER DOWNLOAD EXAMIANS APP

Fuels and Combustion

Fuels and Combustion Combustion of pulverised fuel

Fuels and Combustion With increase in C/H ratio of a fuel, the dew point of flue gases

Fuels and Combustion Fusion point of coal ash increases with increase in its __________ content.

Fuels and Combustion A coal with high ash content is undesirable, as

Fuels and Combustion Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

Fuels and Combustion Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.

Fuels and Combustion
Combustion of pulverised fuel

Fuels and Combustion
With increase in C/H ratio of a fuel, the dew point of flue gases

Fuels and Combustion
Fusion point of coal ash increases with increase in its __________ content.

Fuels and Combustion
A coal with high ash content is undesirable, as

Fuels and Combustion
Mineral matter, 'M' and ash percentage 'A' in coal are roughly related as

Fuels and Combustion
Net calorific value is the gross calorific value less the __________ heat of water in the product of combustion when cooled to 15°C.