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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. Polyhexamethylene adipimide is also known as
Options- A. bakelite
- B. nylon-66
- C. epoxy resin
- D. silicone rubber Discuss
- 2. Isobaric process means a constant process.
Options- A. temperature
- B. pressure
- C. volume
- D. entropy Discuss
- 3. The unit of 'time constant' of a system is the same as that of
Options- A. velocity
- B. time
- C. (time)-1
- D. none of these Discuss
- 4. Pick out the wrong statement.
Options- A. There is no transfer lag for a single first order system.
- B. Stirred tank with a water jacket exemplifies an interacting system.
- C. Transfer lag is a characteristics of all higher order systems (other than first order systems).
- D. Transfer lag decreases as the number of stages decreases. Discuss
- 5. The value of a property decreases __________ with time in straight line method of determining depreciation.
Options- A. linearly
- B. non-linearily
- C. exponentially
- D. logarithmically Discuss
- 6. Power consumption during turbulent flow in agitation tank is proportional to the __________ of the liquid.
Options- A. viscosity
- B. thermal conductivity
- C. surface tension
- D. density Discuss
- 7. One 'amu' is equivalent to
Options- A. 9.31 Mev
- B. 931 eV
- C. 931 MeV
- D. 931 J Discuss
- 8. The most abundant isotope of natural uranium is
Options- A. 92U238
- B. 92U235
- C. 92U234
- D. none of these Discuss
- 9. Heavy water is preferred over ordinary water as a coolant, because it.
Options- A. acts both as an efficient coolant as well as a moderator.
- B. can be heated to a higher temperature without pressurizing.
- C. is less prone to radiation damage.
- D. all (a), (b) and (c). Discuss
- 10. Refractory materials are never used in the construction of
Options- A. segar cones
- B. orton cones
- C. pressure vessels
- D. ovens & retorts Discuss
More questions
Correct Answer: nylon-66
Correct Answer: pressure
Correct Answer: time
Correct Answer: Transfer lag decreases as the number of stages decreases.
Correct Answer: linearly
Correct Answer: density
Correct Answer: 931 MeV
Correct Answer: 92U238
Correct Answer: all (a), (b) and (c).
Correct Answer: pressure vessels
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