FURNACE TECHNOLOGY QUIZ

Power required in case of forced draught as compared to induced draught (for the same draught produced) is

More

Same

Either more or less; depends on the flue gas density Answer: Option B

Less

TRUE ANSWER : ?
YOUR ANSWER : ?

In a furnace, the heat taken by the charge/stock and the heat lost to the furnace structure & flue gases depends on the

Nature of process ; whether batch, continuous or intermittant

Thermal conductivity of the charge & structural materials of furnace

Rate of firing and emissivity of flame

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

Cement Kiln is a

Batch furnace

Rotary Kiln

Tunnel Kiln

Natural draft furnace

TRUE ANSWER : ?
YOUR ANSWER : ?

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

Furnace oil with air

Blast furnace gas with air

Furnace oil with oxygen

Blast furnace gas with oxygen

TRUE ANSWER : ?
YOUR ANSWER : ?

Maximum thermal efficiency of boiler may be about __________ percent.

90

25

10

65

TRUE ANSWER : ?
YOUR ANSWER : ?

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

80

65

40

20

TRUE ANSWER : ?
YOUR ANSWER : ?

Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

Preheating the combustion air

Preheating the fuel gas

All of these

Oxygen enrichment of combustion air

TRUE ANSWER : ?
YOUR ANSWER : ?

Forced recirculation of furnace gases is practised

In furnaces, operating below 750°C

To ensure uniform temperature

To increase heat transfer by convection

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

In which of the following furnaces, the gases are sucked through the stock bed from below?

Beehive oven

Soaking pit

None of these

Sintering machine

TRUE ANSWER : ?
YOUR ANSWER : ?

In a muffle furnace, the muffle

Permits the use of controlled atmosphere for the protection of stock

Retards the heat transfer

Assists in temperature equalisation in the charge

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?