A. It reduces heat transfer area
B. More thinner tubes can be used
C. Pressure drop is reduced
D. It makes condenser compact
Related Mcqs:
- 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 - If a single tube pass heat exchanger is converted to two passes; for the same flow rate, the pressure drop per unit length in tube side will _____________ times?
A. Increase by 1.8
B. Decrease by 22
C. Increase by 21.6
D. None of these - Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally ____________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8″)?
A. Half
B. Three fourth
C. Equal to
D. 1.5 times - In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement ?
A. Results in higher shell side pressure drop
B. Can accomodate less number of tubes for a given shell diameter
C. Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell
side fluid
D. Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer
co-efficient - Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is_______________?
A. Same
B. Less
C. About 3 times
D. About 0.33 times - For identical situation, condensing film coefficient in case of a horizontal condenser is almost ______________ the value expected in case of vertical condenser?
A. Half
B. Twice
C. Thrice
D. Five times - Vertical condenser is advantageous to the horizontal condenser from operation point of view, when________________?
A. Hydrostatic head is required for refluxing the condensate
B. Only the function of condensation is to be carried out
C. Sub-cooling of condensate is desired
D. Both the functions of condensation & sub cooling are carried out in a single unit - 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 - In a shell and tube heat exchanger, tube side _______________ of the mass velocity?
A. Heat transfer co-efficient is proportional to 0.8th power
B. Pressure drop is proportional to the square
C. Both A. & B.
D. Neither A. nor B.
