Fuels and Combustion

A. Coal can be pulverised with great difficulty
B. Coal can’t be pulverised
C. Coal can be easily pulverised
D. Power consumption in grinding the coal will be very high

A. Gas yield is less
B. Tar yield is more
C. Ignition temperature of coke produced is less
D. Aromatic content of tar produced is more

A. To check against its excessive swelling during heating, which may exert high pressure and
damage coke oven walls
B. Because, it alone produces unreactive coke
C. Both A. and B.
D. Neither A. nor B.

A. 300
B. 1100
C. 700
D. 150

A. Increase
B. Decrease
C. Remain unchanged
D. May increase or decrease; depends on the quantity of products of combustion

A. It cannot burn low grade coal
B. It achieves higher fuel combustion efficiency
C. Less heat transfer surface area is required in boilers
D. None of these

A. % of CO2 in
B. % of O2in
C. Temperature of
D. Colour of

A. Flame length
B. Flame temperature
C. Quantity of flue gas
D. Ignition temperature

A. M = 1.1A
B. M = A
C. M = 1.5A
D. M = 2A

A. Sewage gas
B. LPG
C. Producer gas
D. Natural gas