Discussion
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- Question
The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
Options- A. 0.2
- B. 2
- C. 4
- D. 8
- Correct Answer
- 4
- 1. Thermal diffusivity of a refractory brick is high, when its __________ is high.
Options- A. density
- B. specific heat
- C. thermal conductivity
- D. none of these Discuss
- 2. Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?
Options- A. Check plates
- B. Jaw plates
- C. Toggles
- D. Crush shaft Discuss
- 3. If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the
Options- A. linear speed of the basket is doubled.
- B. linear speed of the basket is halved.
- C. centrifugal force is doubled.
- D. capacity of centrifuge is increased. Discuss
- 4. In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
Options- A. concentrate
- B. tailing
- C. middling
- D. none of these. Discuss
- 5. Liquid flow rate in a small channel is best measured by a/an
Options- A. weir
- B. pitot tube
- C. vane meter
- D. venturimeter Discuss
- 6. The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.
Options- A. anaerobic
- B. saphrophytic
- C. aerobic
- D. parasitic Discuss
- 7. High refractorinness of refractory bricks means, that it has a
Options- A. high spalling resistance.
- B. low spalling resistance.
- C. high resistance to fusion.
- D. low porosity. Discuss
- 8. Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is
Options- A. 1/9
- B. 8/9
- C. 1/2
- D. 5/9 Discuss
- 9. Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to - 100°C is
Options- A. 10.73 kJ
- B. 16.15 kJ
- C. 18.11 kJ
- D. 18.33 kJ Discuss
- 10. Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns.
Options- A. 1800
- B. 2200
- C. 2400
- D. 2700 Discuss
More questions
Correct Answer: thermal conductivity
Correct Answer: Jaw plates
Correct Answer: centrifugal force is doubled.
Correct Answer: middling
Correct Answer: pitot tube
Correct Answer: aerobic
Correct Answer: high resistance to fusion.
Correct Answer: 8/9
Correct Answer: 18.11 kJ
Correct Answer: 2700
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