IRRIGATION ENGINEERING QUIZ

Calcination kiln

Soaking pit

L.D. converter

Blast furnace

Attacking the grain boundaries; particularly severe on low carbon and nickel bearing steels at high temperature

Causing metal embrittlement

All of these

Accelerating the rate of scaling

180

130

80

250

All of these

Air supplied and furnace temperature

Air preheat and the flow of gases in the furnace (mixing by induction, by acceleration or by change of direction)

Burner design (thoroughness of mixing versus stratification)

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

None of these

Supply of excess air

Supply of excess fuel

5

50

80

20

10

65

25

90

Solid fuels

Both A and B

Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)

Neither A nor B

The fan operates hot and hence blades are liable to corrosion and erosion

None of these

Air is sucked in, so air leaks are more and hence the furnace efficiency is reduced

Positive pressure exists in the furnace

Kcal/hr

Kcal/m³ combustion space

Kcal/hr/m³ combustion space

None of these