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- Question
A coal with high ash content is undesirable, as
Options- A. it is abrasive to the coal pulveriser (ie.g. ball mill) and the combustion chamber.
- B. the ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash.
- C. the ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer.
- D. all (a), (b) and (c).
- Correct Answer
- all (a), (b) and (c).
- 1. Which of the following is a heat treatment furnace?
Options- A. Muffle furnace
- B. Annealing furnace
- C. Reheating furnace
- D. Rotary kiln Discuss
- 2. __________ mills fall in the category of tumbling mills,
Options- A. Ball and pebble
- B. Rod and tube
- C. Compartment
- D. all (a), (b) & (c) Discuss
- 3. Nitro-phosphate (manufactured at Trom-bay) is a __________ fertiliser.
Options- A. mixed
- B. complex
- C. highly hygroscopic
- D. highly explosive Discuss
- 4. With increasing alumina content, the fusion point of high alumina refractories
Options- A. increases.
- B. decreases.
- C. remains constant.
- D. may increase or decrease ; depends on its alumina content. Discuss
- 5. Main constituent of cotton fibre is
Options- A. lignin
- B. cellulose
- C. starch
- D. gelatine Discuss
- 6. Cv for monoatomic gases is equal to(where, R = gas constant)
Options- A. R
- B. 1.5 R
- C. 2R
- D. 3R Discuss
- 7. Addition of a non-volatile solute to a pure solvent
Options- A. increases its freezing point.
- B. increases its boiling point.
- C. decreases its freezing point.
- D. both (b) and (c) Discuss
- 8. For coarse reduction of hard solids, use
Options- A. impact
- B. attrition
- C. compression
- D. cutting Discuss
- 9. Which of the following is not a natural fibre?
Options- A. Silk
- B. Viscose rayon
- C. Wool
- D. Cotton Discuss
- 10. The function of an economiser in a boiler is to preheat the
Options- A. feedwater
- B. combustion air
- C. pulverised coal
- D. furnace oil Discuss
More questions
Correct Answer: Annealing furnace
Correct Answer: all (a), (b) & (c)
Correct Answer: complex
Correct Answer: increases.
Correct Answer: cellulose
Correct Answer: 1.5 R
Correct Answer: both (b) and (c)
Correct Answer: compression
Correct Answer: Viscose rayon
Correct Answer: feedwater
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