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- Question
Which of the following is not an intensive property?
Options- A. Chemical potential
- B. Surface tension
- C. Heat capacity
- D. None of these
- Correct Answer
- Heat capacity
- 1. The actual temperature drop across the heating surface in an evaporator depends on the
Options- A. feed.
- B. depth of liquid over heating surface.
- C. pressure difference between steam chest and vapour space.
- D. all (a), (b) and (c). Discuss
- 2. A stuffing box is used for
Options- A. absorbing the contraction/expansion of pipeline due to temperature changes.
- B. prevention of fluid leakage around moving parts.
- C. facilitating smooth opening and closing of a valve.
- D. reducing the resistance of fluid flow. Discuss
- 3. On addition of solute in the solvent, the __________ of the solution decreases.
Options- A. boiling point
- B. freezing point
- C. vapour pressure
- D. both (b) and (c) Discuss
- 4. Pick out the wrong statement.
Options- A. The controlling resistance in case of heating of air by condensing steam is in the air film.
- B. The log mean temperature difference (LMTD) for counter flow and parallel flow can be theoretically same when any one of the fluids (hot or cold fluid) passes through the heat exchanger at constant temperature.
- C. In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
- D. Phase change in case of a pure fluid at a given pressure from liquid to vapor or vice-versa occurs at saturation temperature. Discuss
- 5. Temperature of preheated air used for the transportation of pulverised coal through pipes to the burner of a boiler furnace is restricted to a maximum limit of about 300° C to avoid the
Options- A. requirement of large volume combustion chamber.
- B. risk of explosion.
- C. chances of clinker formation.
- D. incomplete combustion of coal. Discuss
- 6. Spherical shaped pressure vessel is considered to be the most ideal, because it can
Options- A. withstand higher pressure for a given metallic shell thickness.
- B. be fabricated very easily.
- C. be designed without wind load considerations.
- D. be supported very easily. Discuss
- 7. Pick out the wrong statement regarding the solubility characteristics of high polymers.
Options- A. Greater the degree of cross-linking in the polymer, lesser is its solubility.
- B. Polymers having more aliphatic character are more soluble in aliphatic solvents, while those polymers having more aromatic character are more soluble in aromatic solvents.
- C. Swelling tendency or solubility of polymers in a particular solvent decreases with increase in molecular weight of the solvent.
- D. High molecul ar weight polymers on dissolving gives solution of very low viscosity. Discuss
- 8. Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C.
Options- A. mercury thermometer
- B. bimetallic thermometer
- C. radiation pyrometer
- D. none of these Discuss
- 9. Biological oxidation ponds remove organic matters present in the polluted water by
Options- A. using the activities of bacteria and other micro organisms.
- B. aerobic oxidation.
- C. both (a) & (b).
- D. neither (a) nor (b). Discuss
- 10. Hydraulic mean depth (Dm) for a circular pipe of diameter 'D' flowing full is 0.25 D. For a circular channel, at Dm = 0.3 D, gives the condition for the maximum
Options- A. flow rate
- B. mean velocity
- C. both 'a' & 'b'
- D. neither 'a' nor 'b' Discuss
More questions
Correct Answer: all (a), (b) and (c).
Correct Answer: prevention of fluid leakage around moving parts.
Correct Answer: both (b) and (c)
Correct Answer: In case of a 1 - 2 shell and tube heat exchanger, the LMTD correction factor value increases sharply, when a temperature cross occurs.
Correct Answer: risk of explosion.
Correct Answer: withstand higher pressure for a given metallic shell thickness.
Correct Answer: High molecul ar weight polymers on dissolving gives solution of very low viscosity.
Correct Answer: bimetallic thermometer
Correct Answer: both (a) & (b).
Correct Answer: mean velocity
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