Chemical Engineering Furnace Design Technology - Set 07 - ObjectiveBooks

Chemical Engineering Furnace Design Technology - Set 07

Practice Test: Question Set - 07

1. Which is the most thermally efficient furnace?
    (A) Reheating furnace
    (B) Reverberatory furnace
    (C) Rotary kilns
    (D) Boiler furnace

2. In a heating process, a heat flow diagram in which the quantities of heat in the various items of a heat balance are represented by the width of a band is called the
    (A) Ostwald chart
    (B) Cox chart
    (C) Sankey diagram
    (D) None of these

3. The advantages of firing pulverised coal in the furnace lies in the fact that, it
    (A) Permits the use of high ash content coal
    (B) Permits the use of low fusion point ash coal
    (C) Accelerates the burning rate and economises on fuel consumption
    (D) All (a), (b) and (c)

4. In producer gas making furnace, steam is added along with air to mainly control the
    (A) Fusion of coal ash & clinker formation
    (B) C. V. of producer gas
    (C) Temperature of producer gas
    (D) Tar content in producer gas

5. ________ furnace is not an electric furnace.
    (A) Arc
    (B) Induction
    (C) Pot
    (D) Resistance

6. Pick out the wrong statement.
    (A) Addition of methane to the furnace atmosphere reduces decarburising by hydrogen
    (B) Nitrogen in presence of steam decor-burises high carbon steel, whereas hydrocarbon gases carburise the surface of steel at annealing temperatures
    (C) Active nitrogen (formed by cracking ammonia at the metal surface) cause nitride formation with increase in surface hardness
    (D) None of these

7. To reduce the stack loss, heat recovery from flue gas can be done by
    (A) Preheating of cold stock
    (B) Preheating of combustion air
    (C) Steam generation in waste heat boilers
    (D) All (a), (b) and (c)

8. Thermal efficiency of furnaces can be improved by
    (A) Waste heat recovery from flue gas
    (B) Minimising heat losses from furnace walls
    (C) Maintaining proper draught
    (D) All (a), (b) and (c)

9. Size of the combustion chamber of a furnace depends upon the
    (A) Heat release rate of the fuel
    (B) Preheat temperature of fuel & air
    (C) Method of mixing the fuel & air
    (D) All (a), (b) and (c)

10. Power required in case of forced draught as compared to induced draught (for the same draught produced) is
    (A) Same
    (B) Less
    (C) More
    (D) Either more or less; depends on the flue gas density

11. An electric furnace producing heat by means of an electric arc struck between each of three electrodes and the charge is called __________ furnace.
    (A) Resistance
    (B) Arc
    (C) Low frequency induction
    (D) None of these

12. While the fuel fired furnace can be used upto a maximum temperature of about 1700°C, the electric furnace can be used upto a temperature of about ________ °C.
    (A) 2000
    (B) 3000
    (C) 4500
    (D) 6000

13. Which of the following is a heat treatment furnace?
    (A) Muffle furnace
    (B) Annealing furnace
    (C) Reheating furnace
    (D) Rotary kiln

14. Rotary kilns are used in the
    (A) Calcination of limestone & dolomite
    (B) Cement manufacture
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

15. In practical operation of any furnace, zero oxygen percentage or theoretical CO2 percentage in flue gas is rarely achieved, because of
    (A) Use of non-preheated combustion air
    (B) Use of pulverised solid fuels
    (C) Imperfect mixing of fuel & air and infiltration of air
    (D) Use of excessive positive draft in the furnace

Show and hide multiple DIV using JavaScript View All Answers

 Next Tests: