Question: A refractory wall separating the stock and the source of heat is provided in a__________________?

• 1. Updraft kiln
• 2. Muffle furnace
• 3. Continuous furnace
• 4. None of these

Question: Turndown ratio of a burner gives an idea of the ______________ in the furnace?

• 1. Range of fuel firing rates
• 2. Volume of the combustion chamber
• 3. Maximum heat input rate only
• 4. Minimum heat input rate only

Question: Which is a continuous furnace ?

• 1. Coke ovens
• 2. Annealing furnace
• 3. Glass tank furnace
• 4. None of these

Question: Overfire burning in a furnace is a phenomenon characterised by____________________?

• 1. Supply of excess fuel
• 2. Supply of excess air
• 3. Burning carbon monoxide and other incombustible in upper zone of furnace by supplyingmore air
• 4. None of these

Question: Regenerators are normally provided in the____________________?

• 1. Glass melting furnace
• 2. Open hearth furnace
• 3. By product coke ovens
• 4. All A, B & C

Question: Which furnace employs preheating, heating and soaking zones ?

• 1. Soaking pit
• 2. Reheating furnace
• 3. Open hearth furnace
• 4. Cupola

Question: Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?

• 1. Stoichiometric combustion air
• 2. Non-preheated combustion air
• 3. Combustion air not enriched with oxygen
• 4. Recuperators

Question: Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?

• 1. Furnace oil with air
• 2. Furnace oil with oxygen
• 3. Blast furnace gas with air
• 4. Blast furnace gas with oxygen

Question: Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?

• 1. Ammonia
• 2. Fine dolomite
• 3. Alkaline powders
• 4. None of these

Question: The function of an economiser in a boiler is to preheat the _____________________?

• 1. Feedwater
• 2. Combustion air
• 3. Pulverised coal
• 4. Furnace oil