A coal containing very high percentage of durain is called ______________ coal?

A. Bright
B. Splint
C. Non-banded
D. Boghead

By-products are _____________ recovered in ‘Beehive ovens’ ?

A. Fully
B. Partially
C. Not at all
D. Negligibly

Anthracite coal ____________________?

A. Contains more volatile matter than bituminous coal
B. Ignites more easily than bituminous coal
C. Is essentially a coking coal
D. Burns with short, bluish, yellow-tipped flame producing very little smoke

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

Stack heat losses can be minimised by________________?

A. Controlling the excess air
B. Oxygen enrichment of combustion air
C. Using low c.v. fuels
D. Maintaining proper draft in the furnace

Calorific value of bituminous coal may be around ______________ Kcal/kg?

A. 500
B. 1500
C. 6500
D. 20000

Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?

A. Bomb
B. Boy’s
C. Junkers
D. None of these

Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?

A. The hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot
B. It reduces its calorific value tremendously
C. It reduces its flame temperature tremendously
D. There are chances of explosion during preheating

Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?

A. 8800 kcal/m3
B. 8800 kcal/kg
C. Same as that of coal middling
D. 25000 kcal/kg

Blast furnace gas burns with a bluish flame, because of the presence of____________________?

A. CO
B. CH4
C. CO2
D. S