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- Question
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference
Options- A. is always less than arithmetic average value.
- B. is always more than arithmetic mean value and the geometric mean value.
- C. is always less than arithmetic mean value, but more than geometric mean value.
- D. may be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current.
- Correct Answer
- is always less than arithmetic average value.
- 1. A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2 ; then the partial pressure of N2 in the mixture will be __________ kgf/cm2 .
Options- A. 1
- B. 2
- C. 4
- D. 8 Discuss
- 2. Ammonium nitrate (a fertiliser) is coated with limestone powder to
Options- A. increase its nitrogen content.
- B. cut down its production cost.
- C. avoid the risk of explosion.
- D. add extra nutrient as fertiliser. Discuss
- 3. Volume percent for gases is equal to the
Options- A. weight percent.
- B. mole percent.
- C. weight percent only for ideal gases.
- D. mole percent only for ideal gases. Discuss
- 4. The osmotic pressure of a solution increases, if its __________ is decreased.
Options- A. volume
- B. solute concentration
- C. temperature
- D. none of these Discuss
- 5. Following the six-tenth factor rule, if a log-log plot of capacity of the equipment vs. cost of the equipment is made, then a straight line is obtained, whose slope is equal to
Options- A. 0.1
- B. 0.6
- C. 0.2
- D. 0.8 Discuss
- 6. The heat recoverable from flue gases of furnaces depends on the
Options- A. thermal efficiency of furnace.
- B. quantity of flue gases.
- C. flue gas temperature drop through the furnace.
- D. all (a), (b) and (c). Discuss
- 7. In bag filters, filter fabrics are never made of
Options- A. metallic wire woven mesh
- B. polyester fibres
- C. cotton fibres
- D. nylon fibres Discuss
- 8. Main source of __________ is monazite sand.
Options- A. uranium
- B. polonium
- C. hafnium
- D. thorium Discuss
- 9. One of the specific gravity scales is "Brix" (used speicifically for sugar solution). It is defined as
Options- A. Brix = (400/G) - 400
- B. Brix = 200 (G-1)
- C. Brix = 145 - (145/G)
- D. none of these Discuss
- 10. The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the
Options- A. Trouton's rule
- B. Kopp's rule
- C. Antonie equation
- D. Kistyakowsky equation Discuss
More questions
Correct Answer: 1
Correct Answer: avoid the risk of explosion.
Correct Answer: mole percent only for ideal gases.
Correct Answer: none of these
Correct Answer: 0.6
Correct Answer: all (a), (b) and (c).
Correct Answer: metallic wire woven mesh
Correct Answer: thorium
Correct Answer: Brix = (400/G) - 400
Correct Answer: Kopp's rule
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