Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type________________?

Related Mcqs:

1. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?

   A. 20
   B. 60
   C. 120
   D. ∞

2. Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?

   A. Galvanising
   B. Tinning
   C. Sherardizing
   D. None of these

3. Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?

   A. Tempering
   B. Hardening
   C. Annealing
   D. Normalising

4. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of ______________ will facilitate the most accurate measurement of the temperature ?

   A. Copper
   B. Steel
   C. Aluminium
   D. Brass

5. Hot & cold working of material causes its _______________ deformation?

   A. Visco-elastic
   B. Isotropic
   C. Elastic
   D. Plastic

6. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is__________________?

   A. More
   B. Less
   C. Equal
   D. Much more

7. Heat release during phase change is observed in case of a/an_________________?

   A. Boiler
   B. Condenser
   C. Evaporator
   D. All A. B. & C.

8. 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 ?

   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

9. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________?

   A. Steel
   B. Glass wood
   C. Copper
   D. Fireclay bricks

10. Baffles provided on the shell side of a shell and tube heat exchanger are meant for _____________________?

    A. Providing support for the tubes
    B. Improving heat transfer
    C. Both A & B
    D. Preventing the fouling of tubes & stagnation of shell side fluid