Furnace Technology MCQs

Question 1

Overfire burning in a furnace is a phenomenon characterised by

Accepted Answer

Burning carbon monoxide and other incombustible in upper zone of furnace by supplying more air

Answer

Supply of excess fuel

Answer

Supply of excess air

Answer

None of these

Question 2

Which of the following variables does not affect the furnace capacity?

Accepted Answer

None of these

Answer

Size of the furnace

Answer

Gas velocity in furnace

Answer

Ratio of wall surface to surface of stock

Question 3

__________ is an indirectly heated furnace.

Accepted Answer

Muffle furnace

Answer

Open hearth furnace

Answer

Soaking pit

Answer

Reheating furnace

Question 4

Reducing atmosphere is maintained in a

Accepted Answer

Blast furnace

Answer

Calcination kiln

Answer

Soaking pit

Answer

L.D. converter

Question 5

Thermal efficiency of a limestone calcination rotary kiln may be around __________ percent.

Accepted Answer

40

Answer

20

Answer

65

Answer

80

Question 6

Main gas valve in a gaseous fuel burner is a __________ valve.

Accepted Answer

Gate

Answer

Butterfly

Answer

Globe

Answer

None of these

Question 7

Ingress of cold air in the furnaces through cracks, charging doors, openings etc.

Accepted Answer

All of the above

Answer

Reduces the flue gas temperature and makes the furnace atmosphere oxidising

Answer

Increases the load on the induced draft fan

Answer

Reduces the furnace draught

Question 8

Which furnace employs an I.D. fan for the removal of flue gases from the furnace?

Accepted Answer

High pressure boiler

Answer

Coke oven

Answer

Blast furnace stoves

Answer

Beehive coke oven

Question 9

The function of an economiser in a boiler is to preheat the

Accepted Answer

Feedwater

Answer

Combustion air

Answer

Pulverised coal

Answer

Furnace oil