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

Related Mcqs:

1. 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

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

   A. Low cost
   B. High latent heat
   C. Non-corrosive condensate
   D. High film co-efficient

3. 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

4. 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

5. 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

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. In sieve plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally ______________ times the hole diameter to give the required hole area?

   A. 0.5 to 1.5
   B. 2.5 to 4.0
   C. 5 to 10
   D. 10 to 15

8. In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones; because the smaller diameter tubes ______________?

   A. Are easier to clean
   B. Are less prone to fouling
   C. Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
   D. None of these

9. The average velocity in the tubes of a 1-4 heat exchanger is ______________ times that in 1-1 heat exchanger having the same size & number of tubes and operated at same liquid flow rate ?

   A. 2
   B. 1/2
   C. 4
   D. 1/4

10. The thickness of heat transfer plates used in the plate type heat exchanger ranges from _____________ mm, pressed in a single piece provided with grooves & corrugations?

    A. 0.3 to 0.8
    B. 1.25 to 3.125
    C. 3.5 to 7.0
    D. 8 to12