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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. P2O5 percentage in the phosphoric acid produced by wet process is about
Options- A. 10
- B. 30
- C. 50
- D. 70 Discuss
- 2. Unit of radioactivity is
Options- A. barn
- B. fermi
- C. angstrom
- D. curie Discuss
- 3. A liquid is in equilibrium with its vapor at its boiling point. On an average, the molecules in the liquid and gaseous phases have equal
Options- A. kinetic energy.
- B. intermolecular forces of attraction.
- C. potential energy.
- D. total energy. Discuss
- 4. The disintegration rate of a radioactive element
Options- A. progressively increases.
- B. progressively decreases.
- C. remains constant throughout.
- D. may increase or decrease depending on the material. Discuss
- 5. In washing type plate and frame filter press, the ratio of washing rate to the final filtrate rate is
Options- A. 4
- B. 1/4
- C. 1
- D. 1/2 Discuss
- 6. Which of the following types of nuclear reactors is most prone to radioactive hazards?
Options- A. Pressurised water reactor
- B. Gas cooled reactor
- C. Molten sodium cooled reactor
- D. Boiling water reactor Discuss
- 7. 1 kgf/cm2 is not equal to
Options- A. 1 torr
- B. 1 bar
- C. 10000 mm wc
- D. 100 KPa = 100 000 N/m2 Discuss
- 8. Vulcanisation of rubber does not increase its
Options- A. softness
- B. oxidation resistance
- C. weight & strength
- D. elasticity & water solubility Discuss
- 9. Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes
Options- A. blood poisoning.
- B. anaemia.
- C. nervous system disorder.
- D. all (a), (b) & (c). Discuss
- 10. Energy consumption in a crusher decreases with increase in the
Options- A. size of the product (at constant feed size).
- B. capacity of the crushing machine.
- C. size of feed (at constant reduction ratio).
- D. all (a), (b) & (c). Discuss
More questions
Correct Answer: 30
Correct Answer: curie
Correct Answer: kinetic energy.
Correct Answer: progressively decreases.
Correct Answer: 1/4
Correct Answer: Boiling water reactor
Correct Answer: 1 torr
Correct Answer: softness
Correct Answer: all (a), (b) & (c).
Correct Answer: all (a), (b) & (c).
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