Steam is preferred to be used as a heating medium in heat exchangers, because of its_________________?

Related Mcqs:

1. In shell and tube heat exchangers, straight tie rods are used to_________________?

   A. Hold baffle in space
   B. Fix the tubes in position
   C. Account for thermal strain
   D. None of these

2. ______________ of water makes it a widely used coolant in heat exchangers?

   A. Low corrosiveness
   B. Low dirt factor
   C. High specific heat
   D. Low viscosity

3. Floating head heat exchangers are used for the____________________?

   A. Heat transfer between corrosive fluids
   B. Cases where temperature difference between the shell and the tubes is more (>50°C)
   C. Co-current heat transfer systems
   D. Counter-current heat transfer systems

4. What is the minimum recommended ligament for square pitch arrangement in case of heat exchangers ?

   A. 6.5 cms
   B. 6.5 mm
   C. Equal to tube I.D
   D. Equal to tube O.D

5. In most of the shell and tube heat exchangers, the tube pitch is generally ______________ the tube diameter?

   A. Less than
   B. 1.25-1.50 times
   C. 2.5 times
   D. one-fourth of

6. Minimum tube pitch recommended for shell and tube heat exchangers is about _______________ times the outside diameter of the tube?

   A. 1.25
   B. 1.75
   C. 2.5
   D. 3.5

7. Steam economy is defined as the amount of evaporation per unit amount of steam used, while the capacity is the total evaporation obtained per hour. Use of multiple effects in evaporation ?

   A. Increases capacity
   B. Increases economy
   C. Does not affect the capacity
   D. Both B. & C.

8. Steam side heat transfer co-efficient for design consideration under ordinary condition can be assumed to be about _____________ kcal/hr.m2.°C?

   A. 1250
   B. 2500
   C. 7500
   D. 15000

9. In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be_________________?

   A. Same as that for fluid flow
   B. Less than that for fluid flow
   C. More than that for fluid flow
   D. D2 – D1 (D1 and D2 are I.D. of inner and outer pipes respectively)

10. In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer coefficient (hi) vanishes after a Reynold number of_____________?

    A. 1000
    B. 3000
    C. 5000
    D. 10000