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- Question
A 10 cm dia steam pipe, carrying steam at 180°C, is covered with an insulation (conductivity = 0.6 W/m.°C). It losses heat to the surroundings at 30°C. Assume a heat transfer co-efficient of 0.8 W/m2.°C for heat transfer from surface to the surroundings. Neglect wall resistance of the pipe and film resistance of steam. If the insulation thickness is 2 cms, the rate of heat loss from this insulated pipe will be
Options- A. greater than that for uninsulated steam pipe.
- B. less than that of the uninsulated steam pipe.
- C. equal to that of the uninsulated steam pipe.
- D. less than the steam pipe with 5 cms insulation.
- Correct Answer
- less than that of the uninsulated steam pipe.
- 1. Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)
Options- A. S2/S1
- B. S1/S2
- C. S1 - S2
- D. S1 x S2 Discuss
- 2. Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a
Options- A. thermocouple
- B. reistance thermometer
- C. mercury in glass thermometer
- D. vapor pressure thermometer Discuss
- 3. Roof of a basic electric furnace is made of __________ bricks.
Options- A. superduty fireclay
- B. silica
- C. chromite
- D. none of these Discuss
- 4. Foot valves provided in pumps are __________ valves.
Options- A. relief
- B. three/four way
- C. pressure reducing
- D. directional control Discuss
- 5. Oxygen percentage in the flue gas coming out of a gaseous fuel fired furnace should be ideally about __________ percent.
Options- A. < 2
- B. < 5
- C. < 8
- D. < 10 Discuss
- 6. What is the Laplace transform of impulse input having magnitude 'X'?
Options- A. X
- B. X2
- C. 1/X
- D. 1 Discuss
- 7. Which of the following expressions defines the Baume gravity scale for liquids lighter than water?
Options- A. °Be = (140/G) - 130
- B. °Be = 200(G-1)
- C. °Be = 145 - (145/G)
- D. °Be = (400/G) - 400 Discuss
- 8. Which is not an acidic refractory?
Options- A. Silica
- B. Fireclay
- C. High alumina refractory
- D. Carbon black Discuss
- 9. Which of the following is the best nuclear fuel?
Options- A. Np- 239
- B. U-234
- C. Pu-239
- D. Th-236 Discuss
- 10. Sulphuric acid mist is arrested by using a __________ scrubber.
Options- A. packed wet
- B. hollow wet
- C. venturi
- D. co-current Discuss
More questions
Correct Answer: S1/S2
Correct Answer: thermocouple
Correct Answer: silica
Correct Answer: directional control
Correct Answer: < 2
Correct Answer: 1
Correct Answer: °Be = (140/G) - 130
Correct Answer: Carbon black
Correct Answer: Pu-239
Correct Answer: venturi
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