A. U1 = U2
B. U2 > U1
C. U1 > U2
D. U1 = dirt factor – U2
A. Co-current
B. Counter-current
C. Turbulent
D. Laminar
A. Co-current
B. Cross-current
C. Counter-current
D. Direct contact
A. Re and Pr
B. Re and Gr
C. Pr and Gr
D. Re and Sc
A. In low range of temperature differences
B. In high range of temperature differences
C. Because of its low cost
D. To prevent corrosion of the tube bundles
A. Medium
B. Temperature
C. Surface
D. None of these
A. Occupies smaller space
B. Is more economical
C. Is easy to operate and maintain
D. All A., B. and C.
A. 10
B. > 10
C. < 10
D. Either B. or C., depends on the mass of the body
A. 1 to 100
B. 0.5 to 50
C. 10 to 100
D. 100 to 1000
A. Presence of a non-condensable gas decreases the condensing film co-efficient
B. Gases under high pressure are routed through the tube side, because high pressure gases are
corrosive in nature
C. Gases to be heated/cooled is normally routed through the shell side, because the corrosion
caused by the cooling water or steam condensate remain localised to the tubes
D. All A, B. & C.