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- Question
Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?
Options- A. Emissivity of pipe surface.
- B. Diameter & length of the pipe.
- C. Temperature of hot pipe surface & that of air in the room.
- D. none of these.
- Correct Answer
- none of these.
- 1. The following type of bonding is strongly directional in solids.
Options- A. Vander Waal's
- B. Ionic
- C. Metallic
- D. Covalant Discuss
- 2. Tin based white metals are used, where bearings are subjected to
Options- A. high pressure & load.
- B. low pressure & load.
- C. high temperature.
- D. large surface wear. Discuss
- 3. A solar cell converts the sunlight directly into __________ energy.
Options- A. thermal
- B. electrical
- C. mechanical
- D. chemical Discuss
- 4. Maximum permissible air velocity in pipelines is about __________ metre/second.
Options- A. 5
- B. 10
- C. 20
- D. 40 Discuss
- 5. Pick out the wrong statement.
Options- A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'.
- B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
- C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
- D. Tungsten steel and alnico are not hard magnetic materials. Discuss
- 6. In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
Options- A. t = 15 - 0.0065 h
- B. t = 15 + 0.0065 h
- C. t = 0.0035 h - 15
- D. t = 15 - 0.0035 h Discuss
- 7. The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K= 0.04 W/m.°K and thickness 0.16m is 10 W/m2. The temperature of the inside wall is - 5°C. The outside wall temperature is
Options- A. 25°C
- B. 30°C
- C. 35°C
- D. 40°C Discuss
- 8. Hot water (0.01 m3 /min) enters the tube side of a counter current shell and tube heat exchanger at 80°C and leaves at 50°C. Cold oil (0.05 m3/min) of density 800 kg/m3 and specific heat of 2 kJ/kg.K enters at 20°C. The log mean temperature difference in °C is approximately
Options- A. 32
- B. 37
- C. 45
- D. 50 Discuss
- 9. In case of vertical tube evaporator, with increase in liquor level, the overall heat transfer co-efficient
Options- A. increases
- B. decreases
- C. is not affected
- D. may increase or decrease; depends on the feed Discuss
- 10. The number of kg vaporised per kg of steam fed to the evaporator is defined as
Options- A. capacity
- B. rate of evaporation
- C. economy
- D. rate of vaporisation Discuss
Chemical Engineering Basics problems
Search Results
Correct Answer: Covalant
Correct Answer: high pressure & load.
Correct Answer: electrical
Correct Answer: 10
Correct Answer: Tungsten steel and alnico are not hard magnetic materials.
Correct Answer: t = 15 - 0.0065 h
Correct Answer: 35°C
Correct Answer: 32
Correct Answer: decreases
Correct Answer: economy
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