Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Which one of them is a correct combination? 1) Boundary Lubrication i) Dimensionless film thickness < 1 2) Hydrodynamic Lubrication ii) Dimensionless film thickness lies between 1 and 3 3) Mixed Lubrication iii) Dimensionless film thickness lies between 3 and 5 4) Elastohydrodynamic Lubrication iv) Dimensionless film thickness is greater than 5

A

1 - (i), 2 - (iv), 3 - (ii), 4 - (iii)

B

1 - (iv), 3 - (iii), 2 - (i), 4 - (ii)

C

2 - (i), 3 - (iv), 4 - (iii), 1 - (ii)

D

3 - (iv), 2 - (iii), 1 - (i), 4 - (ii)

The dimensionless number in mass transfer operations which is analogous to Nusselt number in heat transfer is known as

A

Lewis number

B

Sherwood number

C

Peclet number

D

Schimdt number

Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

A

Schmidt

B

Sherwood

C

Peclet

D

Stanton

What is the monoisotopic and average mass of valine? Given data: Mass of the most abundant isotope of Carbon (C°)=12.0000, Mass of most abundant isotope of Hydrogen (H°)=1.0078, Mass of most abundant isotope of Oxygen (O°)=15.9949, Mass of most abundant isotope of Nitrogen (N°)=14.0031, The average mass of Carbon (C)=12.011, The average mass of Hydrogen (H)=1.008, The average mass of Oxygen (O)=15.999, The average mass of Nitrogen (N)=14.007.

A

99.068 and 99.2361

B

99.216 and 99.326

C

99.111 and 99.321

D

99.068 and 99.132

Consider the following standard symbols for two-port parameters: 1. h12 and h21 are dimensionless 2. h11 and B have dimension of ohms 3. BC is dimensionless 4. C is dimensionless Which of the above are correct?

A

1, 2 and 3 only

B

1, 2 and 4 only

C

3 and 4 only

D

1, 2, 3 and 4

A stream of air at 100 kPa pressure and 300 K is flowing on the top surface of a thin flat sheet of solid naphthalene of length 0.2 m with a velocity of 20 m/sec. The other data are: Mass diffusivity of naphthalene vapor in air = 6 * 10 –6 m2/sec Kinematic viscosity of air = 1.5 * 10 –5 m2.sc Concentration of naphthalene at the air-solid naphthalene interface = 1 * 10 – 5 kmol/m3 Calculate the overage mass transfer coefficient over the flat plate. Note: For heat transfer over a flat plate, convective heat transfer coefficient for laminar flow can be calculated by the equation. Nu = 0.664 ReL1/2 Pr1/3 you may use analogy between mass and heat transfer.

A

0.014 m/sec

B

0.015 m/sec

C

0.016 m/sec

D

0.013 m/sec

The dimensionless group in mass transfer that is equivalent to Prandtl number in heat transfer is

A

Nusselt number

B

Sherwood number

C

Schmidt number

D

Stanton number

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities Cmax and Cmin. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

A

A.Cmin/U

B

U/A.Cmin

C

A.U.Cmin

D

A.U/Cmin

A heat exchanger with heat transfer surface area A and overall heat transfer coefficient U handles two fluids of heat capacities C_max and C_min. The number of transfer units (NTU) used in the analysis of heat exchanger is specified as

A

AC_min/U

B

U/AC_min

C

AUC_min

D

AU/C_min

Group I shows different heat addition processes in power cycles. Likewise, Group II shows different heat removal processes. Group III lists power cycles. Match items from Groups I, II and III. Group I Group II Group III P. Pressure constant S. Pressure constant 1. Rankine cycle Q. Volume constant T. Volume constant 2. Otto cycle R. Temperature constant U. Temperature constant 3. Carnot cycle 4. Diesel cycle 5. Brayton cycle

A

P – S – 5, R – U – 3, P – S – 1, Q – T - 2

B

P – S – 1, R – U – 3, P – S – 4, P – T - 2

C

R – T – 3, P – S – 1, P – T – 4, Q – S - 5

D

P – T – 4, R – S – 3, P – S – 1, P – S - 5

Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.

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