Questions and answers for exam Preparation

MCQs

Total Questions : 757 | Page 72 of 76 pages

Question 711. Reverberatory furnace is used for_____________________?

Roasting/reduction of ores
Annealing steel coil
Heating air
Steel melting

Discuss Question

Answer: Option A. -> Roasting/reduction of ores
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 712. Heat transfer rate to the stock/charge in the furnace does not depend upon the________________?

Emissivity of the refractory walls
Size of the furnace
Use of waste heat recovery equipments
Thickness of the stock

Discuss Question

Answer: Option C. -> Use of waste heat recovery equipments
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 713. The main function of a muffle in the muffle furnace is to__________________?

Protect the charge from the effects of the products of combustion
Smooth out temperature inequalities on the combustion side of the muffle wall
Both A. & B.
Neither A. nor B.

Discuss Question

Answer: Option C. -> Both A. & B.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 714. Fuel used in B.F. stove is______________________?

Pulverised coal
Furnace oil
Blast furnace gas/mixed gas
Coke oven gas

Discuss Question

Answer: Option C. -> Blast furnace gas/mixed gas
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 715. An example of recuperative furnace is the__________________?

Soaking pit
Open hearth furnace
Coke ovens
None of these

Discuss Question

Answer: Option A. -> Soaking pit
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 716. Which is a regenerative furnace ?

Coke oven heating chamber
Open hearth furnace
Both A. and B.
Neither A. nor B.

Discuss Question

Answer: Option C. -> Both A. and B.
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 717. In a furnace employing forced draught as compared to induced draught______________________?

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced
The fan operates hot and hence blades are liable to corrosion and erosion
Positive pressure exists in the furnace
None of these

Discuss Question

Answer: Option C. -> Positive pressure exists in the furnace
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 718. In order to maintain an oxidising atmosphere in a furnace, it should have__________________?

More of excess air
Less of excess air
More of CO in flue gas
More of CO2 in flue gas

Discuss Question

Answer: Option A. -> More of excess air
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 719. Overall thermal efficiency of a lumpy coal fired suitably designed heating furnace, if operated & maintained properly may be about ____________ percent?