## Machine Design MCQ Set 1

1. The Concentration of the two phases in a closed system at the Interphase is

a) Changes continuously

b) Never changes

c) Becomes zero

d) Increases till the driving force becomes zero

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2. Diffusion of components between the phases at equilibrium is

a) Zero

b) Infinity

c) Changes continuously

d) Diffusion never occurs

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3. Consider a steady-state condition; the concentration at any point in the equipment never changes with time.

a) True

b) False

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4. Find the x & y co-ordinate in the figure below at steady state. Here, the gas phase and liquid phase mole fraction representation is given below

a) x- distance & y- concentration

b) x-time & y- concentration

c) x-concentration & y- time

d) x-concentration & y-distance

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5. The real driving force of the mass transfer is

a) Chemical potential

b) Physical potential

c) Pressure gradient

d) Concentration gradient

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6. According to Lewis and Whitman theory, the departure from concentration equilibrium at the Interphase is due to

a) Low mass transfer rates

b) High mass transfer rates

c) Moderate mass transfer rate

d) None of the mentioned

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7. At the Interphase, the Interphase concentration of the component in both phase phases have equal chemical potential is due to differential concentration.

a) True

b) False

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8. The equilibrium concentrations in the gas and the liquid phases, in mole fraction, give rise to a curve known as

a) Equilibrium distribution curve

b) Equilibrium concentration curve

c) Differential distribution curve

d) Differential concentration curve

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## Machine Design MCQ Set 2

1. Wood ash leaching for alkali is known as ________

a) Lixivation

b) Lixartion

c) Lixation

d) None of the mentioned

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2. The boiling point of the solvent is ______

a) Boiling solvent

b) Decoction

c) Leaching

d) None of the mentioned

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3. The removal of soluble materials from the solid is known as ________

a) Elution

b) Decoction

c) Extraction

d) None of the mentioned

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4. Leaching is generally used for cement industries

a) True

b) False

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5. For getting leached product from copper ore it is mandatory to add hydrochloric acid to the ore.

a) True

b) False

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6. Find the process

a) Leaching

b) Extraction

c) Evaporation

d) None of the mentioned

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7. Which of the following process can accelerate leaching?

a) Heating

b) Drying

c) Crushing

d) Crushing or grinding

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8. The process elution is also known as elutriation.

a) True

b) False

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9. Temperature of the solvent be low.

a) True

b) False

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10. If the solvent viscosity is low and temperature of the solvent is high then the leaching rate decreases.

a) True

b) False

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11. In order to reduce the time required for the removing solute the sugar beets are cut into slices known as

a) Cossettes

b) Coset

c) Consot

d) All the mentioned

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## Machine Design MCQ Set 3

1. What is the melting point of chromium?

a) 2118 K

b) 2218 K

c) 2318 K

d) 2418 K

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2. What is the melting point of cobalt?

a) 1449 K

b) 1559 K

c) 1669 K

d) 1769 K

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3. Which one is having highest melting point?

a) Bismuth

b) Beryllium

c) Cadmium

d) Copper pure

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4. What is the melting point of germanium?

a) 1211 K

b) 1311 K

c) 1411 K

d) 1511 K

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5. Which one is having minimum melting point?

a) Tin

b) Iron pure

c) Germanium

d) Gold

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6. What is the melting point of nichrome?

a) 1572 K

b) 1672 K

c) 1772 K

d) 1872 K

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7. What is the melting point of palladium?

a) 1527 K

b) 1627 K

c) 1727 K

d) 1827 K

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8. Which one is having maximum melting point?

a) Palladium

b) Magnesium

c) Platinum pure

d) Lead

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9. What is the melting point of tin?

a) 505 K

b) 605 K

c) 705 K

d) 805 K

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10. Which one is having minimum melting point?

a) Titanium

b) Zinc

c) Uranium

d) Rhodium

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## Machine Design MCQ Set 4

1. __________ energy helps for molecular diffusion.

a) Thermal

b) Electrical

c) Internal

d) All of the mentioned

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2. For two particles at steady state collision of A and B, J flux of A is 2 mol/sq.m sec find the J flux of B.

a) 1

b) 2

c) 3

d) None of the mentioned

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3. Estimate the mole fraction if concentration of A is 2 mol/cu.m and the total concentration is 5 mol/cu.m.

a) 0.2

b) 0.25

c) 0.4

d) 1

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4. Find the partial pressure of A if the total pressure is 2 atm; Concentration of A is 2 mol/cu.m and total concentration is 5 mol/cu.m.

a) 0.2 atm

b) 0.4 atm

c) 0.6 atm

d) 0.8 atm

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5. From the reaction, Methane –> Carbon + 2(Hydrogen molecule) find the ratio of N Flux of A to the Total N flux( A+B); Given N Flux of B =-2 N flux of A.

a) 1

b) -1

c) 2

d) -2

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6. For a Steady state diffusion of A through Non- diffusing B. N flux of B= ______

a) 0

b) 1

c) 2

d) Infinity

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7. The value of N flux of A under steady state non-diffusing B with diffusing A is _________

a) 0

b) Constant

c) Infinity

d) None of the mentioned

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8. If the value of N flux of A to the total N flux is 1 then it is a steady state diffusion of non-diffusing B.

a) True

b) False

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## Machine Design MCQ Set 5

1. Before collision, the distance between the two particles is mean free path.

a) True

b) False

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2. Diffusion co-efficient in molecular diffusion is estimated by _________

a) Daltons law

b) Diffusion law

c) Ficks law

d) None of the mentioned

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3. Find the total flux for a particle A and B in a steady state if flux of A and B is 2.44 and 4.44 mol/sq.m sec.

a) 2

b) 4.88

c) 6.88

d) 8

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4. Find the flux of A ( xA= 0.2) if Total flux is 5 mol/sq.m sec and J flux of A is 2 mol/sq.m sec.

a) 2

b) 2.5

c) 3

d) 3.5

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5. Find J flux of A ( xA = 0.5) if the total N flux is 6 mol/sq.m sec and N flux of A is 3 mol/sq.m sec.

a) 0

b) 1

c) 2

d) 3

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6. Diffusivity of the liquids can be determined by

a) Wilke- lee equation

b) Wilke- chan equation

c) Lee and chan equation

d) None of the mentioned

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7. For the molecular diffusion of liquids, if the diffusing molecules having criteria of steady state diffusion of B over non diffusing A then the N flux of A is

a) 1

b) 0

c) Negative

d) Infinity

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8. For liquid molecular diffusion of A and B, steady state equimolar counter diffusion the N flux of A is negative of N flux of B.

a) True

b) False

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9. Find the change in concentration for a steady state equimolar counter diffusion if D(AB)= 6 sq.m/sec, the change in distance is 2 m and the N flux of A is 5 mol/sq.m sec.

a) 0.67

b) 1.67

c) 2.67

d) None of the mentioned

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10. Find the diffusivity of AB in sq.m/sec if N flux of A 5 mol/sq.m sec, concentration difference is 2mol/cu.m and distance is 3 m.

a) 2.5

b) 5.5

c) 7.5

d) 10.5