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

• 1. CO
• 2. CH4
• 3. CO2
• 4. S

Question: Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?

• 1. 60
• 2. 160
• 3. 500
• 4. 750

Question: Orsat apparatus is meant for ___________________?

• 1. Gravimetric analysis of flue gas
• 2. Finding out combustion efficiency
• 3. Direct determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride
• 4. None of these

Question: The combustion reaction, C + O2 = CO2, is ___________________?

• 1. Exothermic
• 2. Endothermic
• 3. Autocatalytic
• 4. None of these

Question: Which of the following constituents of coal is the most important in the production of coke ?

• 1. Moisture
• 2. Ash
• 3. Volatiles
• 4. Carbon

Question: The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?

• 1. Carbon tetrachloride
• 2. Sand (40%)
• 3. Mineral oil of high viscosity & specific gravity (1.6)
• 4. None of these

Question: Quantity of coke produced from metallurgical coal may be around _____________ percent?

• 1. 30
• 2. 50
• 3. 75
• 4. 95

Question: Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?

• 1. Hydrogenation
• 2. Gasification
• 3. Carbonisation
• 4. None of these

Question: Gross and net calorific value of a fuel will be the same__________________?

• 1. If its ash content is zero
• 2. If its carbon content is very low
• 3. If its hydrogen/hydrogen compound content is zero
• 4. Under no circumstances

Question: Beehive coke oven________________?

• 1. Facilitates by-products recovery
• 2. Takes 2-3 days for coking of coal but requires no external fuel for heating
• 3. Gives larger yield of coke (around 85%) as compared to by-product ovens
• 4. Produces coke with very poor strength