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- Question
Presence of free moisture in coal during its high temperature carbonisation
Options- A. reduces the coking time.
- B. protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- C. increases the loss of fine coal dust from the ovens when charging.
- D. none of these.
- Correct Answer
- protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- 1. Pick out the wrong statement.
Options- A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
- B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
- C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
- D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction. Discuss
- 2. In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.
Options- A. 35
- B. 50
- C. 70
- D. 85 Discuss
- 3. A solution is made by dissolving 1 kilo mole of solute in 2000 kg of solvent. The molality of the solution is
Options- A. 2
- B. 1
- C. 0.5
- D. 0.5 Discuss
- 4. In case of wet spinning of polymers, the polymer solution is forced through spinnerates into, a coagulating bath to give a filament form. Wet spinning is not used in case of the __________ fibres.
Options- A. viscose rayon
- B. acrylic
- C. polyvinyl acetate
- D. saturated polyester Discuss
- 5.
for a Tee (used as elbow, entering branch) would be
Options- A. less than that for Tee (used as elbow, entering run).
- B. more than that for Tee (used as elbow, entering run).
- C. around 90.
- D. both (b) and (c). Discuss
- 6. Heat of transition is the heat evolved or absorbed, when a substance is converted from
Options- A. vapor to liquid.
- B. vapor to solid.
- C. solid to liquid.
- D. one allotropic form to another allotropic form. Discuss
- 7. The combustion reaction, C + O2 = CO2, is
Options- A. exothermic
- B. endothermic
- C. autocatalytic
- D. none of these Discuss
- 8. Chain growth polymerisation is a process, in which the monomers are added in a chain fashion, and it requires an initiator to produce the free radical. An example of chain growth polymerisation products is
Options- A. nylon-66
- B. teflon
- C. polyester
- D. bakelite Discuss
- 9. The major constituent of laminate of safety glass, which holds the broken glass, pieces in their places during accident (and thus minimises the danger from flying glass fragments) is
Options- A. polyvinyl alcohol
- B. polyvinyl acetale
- C. polyvinyl butyral
- D. PVC Discuss
- 10. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
Options- A. acts as a green house gas thereby raising earth's temperature.
- B. causes asphyxia.
- C. causes increase in sea level.
- D. inhances the green house effect. Discuss
More questions
Correct Answer: Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
Correct Answer: 50
Correct Answer: 0.5
Correct Answer: saturated polyester
Correct Answer: both (b) and (c).
Correct Answer: one allotropic form to another allotropic form.
Correct Answer: exothermic
Correct Answer: teflon
Correct Answer: polyvinyl butyral
Correct Answer: causes asphyxia.
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