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- Question
A cottrel precipitator makes use of the __________ for dusty air cleaning.
Options- A. electric spark
- B. corrona discharge
- C. alternating current
- D. none of these.
- Correct Answer
- corrona discharge
- 1. Neutralisation of nitric acid with ammonia to produce ammonium nitrate is a/an __________ reaction.
Options- A. catalytic
- B. endothermic
- C. exothermic
- D. autocatalytic Discuss
- 2. Pick out the wrong conversion formula for the conversion of weight units :
Options- A. 1 tonne = 1000 kg = 22.046 lbs
- B. 1 U.S. ton = 907 kg = 0.907 tonne = 0.893 ton
- C. 1 ton = 2240 lbs = 1016 kg = 1.016 tonnes = 1.12 U.S. tons
- D. none of these Discuss
- 3. Alkyd resin can not be used for making
Options- A. plasticiser
- B. paint & varnish
- C. fibres
- D. film forming materials Discuss
- 4. Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.
Options- A. jaw crusher
- B. hammer crusher
- C. ball mill
- D. tube mill Discuss
- 5. Neon gas is
Options- A. flammable in nature.
- B. used in color discharge tube.
- C. filled in lamps having tungsten filament.
- D. all (a), (b) and (c). Discuss
- 6. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
Options- A. zero
- B. positive
- C. negative
- D. none of these Discuss
- 7. A coal having high amount of volatile matter
Options- A. would require smaller combustion chamber.
- B. produces very little of tar and gas on carbonisation.
- C. ignites easily and burns with long smoky flame.
- D. all (a), (b) and (c). Discuss
- 8. Scouring is a finishing operation during the manufacture of fibre, which aims at __________ of fibres.
Options- A. improving the stretchability
- B. dyeing/colouring
- C. detergent solution washing
- D. glycol soaking Discuss
- 9. The operating speed of a ball mill should be __________ the critical speed.
Options- A. less than
- B. much more than
- C. at least equal to
- D. slightly more than Discuss
- 10. Kick's law assumes that the energy required for size reduction is proportional to the logarithm of the ratio between the initial and the final diameters. The unit of Kick's constant is
Options- A. kW. sec/kg
- B. kWh/kg
- C. kWh/sec. kg
- D. kg/sec. Discuss
More questions
Correct Answer: exothermic
Correct Answer: none of these
Correct Answer: fibres
Correct Answer: hammer crusher
Correct Answer: used in color discharge tube.
Correct Answer: negative
Correct Answer: all (a), (b) and (c).
Correct Answer: detergent solution washing
Correct Answer: less than
Correct Answer: kW. sec/kg
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