Q.1
• a) 0.423
• b) 0.523
• c) 0.623
• d) 0.723
Q.2
##### Air atdegree Celsius temperature flows atm/s past a wet flat plate of length 0.5 m. Estimate the value of mass transfer coefficient. Assume that the water vapor content of air initially is negligible and take the following thermos-physical properties of air
• a) 0.1076 m/s
• b) 0.2076 m/s
• c) 0.3076 m/s
• d) 0.4076 m/s
Q.3
##### Consider the above problem, find out the value of Reynolds number
• a) 14.09 * 10 8
• b) 14.09 * 10 7
• c) 14.09 * 10 6
• d) 14.09 * 10 5
Q.4
• a) 2.89
• b) 1.89
• c) 3.89
• d) 0.89
Q.5
##### Air at 1 atm anddegree Celsius temperature, flows inside a 3 cm diameter tube with a velocity of 5.m/s. Determine mass transfer coefficient for iodine transfer from the air stream to the weak surface. Assume the following thermos-physical properties of air
• a) 0.0176 m/s
• b) 1.0176 m/s
• c) 2.0176 m/s
• d) 3.0176 m/s
Q.6
• a) 84.44
• b) 74.44
• c) 64.44
• d) 54.44
Q.7
##### The empirical correlation for local mass transfer coefficient for laminar boundary layer flow past a flat plate is given by
• a) Sh X = 0.332 (Re) 0.5 (Sc) 0.23
• b) Sh X = 0.332 (Re) 0.5 (Sc) 0.33
• c) Sh X = 0.332 (Re) 0.5 (Sc) 0.43
• d) Sh X = 0.332 (Re) 0.5 (Sc) 0.53
Q.8
##### The empirical correlation for local mass transfer coefficient for turbulent boundary layer flow past a flat plate is given by
• a) Sh X = 0.332 (Re) 0.5 (Sc) 0.33
• b) Sh X = 0.332 (Re) 0.6 (Sc) 0.33
• c) Sh X = 0.0298 (Re) 0.7 (Sc) 0.33
• d) Sh X = 0.0298 (Re) 0.8 (Sc) 0.33
Q.9
##### The expression for average mass transfer coefficient is
• a) Sh = 0.664 (Re) 0.5 (Sc) 0.33
• b) Sh = 0.664 (Re) 0.6 (Sc) 0.33
• c) Sh = 0.332 (Re) 0.7 (Sc) 0.33
• d) Sh = 0.332 (Re) 0.8 (Sc) 0.33
Q.10
##### Sherwood number is a function of
• a) Lewis number and Reynolds number
• b) Prandtl number and Lewis number
• c) Reynolds number and Schmidt number
• d) Schmidt number and Lewis number