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
Related Mcqs:
- 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 - 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 - ______________ 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 - 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 - 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 - 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 - Practical dividing line between a ductile and brittle materials is suggested, when the ultimate elongation is about 5%. Generally, larger the knuckle radius, stronger is the corner torus section of a head. The knuckle radius provided should be less than ______________ of the head?
A. 6% of I.D.
B. 3 times the thickness
C. Either A. or B., whichever is larger
D. Either A. or B., whichever is smaller - A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the__________________?
A. Central dished section and corner torus section
B. Corner torus section and central dished section
C. Central dished section and straight flange section
D. Straight flange section and corner torus section - 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 - In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
A. ∞
B. 1
C. 20.8
D. 2
