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Home » Engineering » Aptitude Test - 109
Hassan
1.In steam distillation, the __?
A. Temperature is 100°C
B. Temperature is more than 100° C
C. Product must be immiscible with water
D. Temperature is 100°C
2.Dried finished product sampled from various parts of a ____ dryer exhibits nonuniformity in the moisture content?
A. Rotary
B. Tray
C. Freeze
D. Rotary
3.The value of „L/mG’ ratio for economical absorption operation ranges from?
A. 0.5 to 0.8
B. 0.8 to 1.2
C. 1.25 to 2.0
D. 0.5 to 0.8
4.Large quantity of silica gel is normally dried in a __ dryer?
A. Freeze
B. Through circulation
C. Rotary vacuum
D. Freeze
5.Mass transfer co-efficient is defined as__?
A. Flux = Co-efficient/concentration difference
B. Co-efficient = Flux/concentration difference
C. Flux=concentration difference/coefficient
D. Flux = Co-efficient/concentration difference
6.Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be___?
A. Cooled
B. Humidified
C. Dehumidified
D. Cooled
7.In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ___ number ?
A. Lewis
B. Grashoff
C. Sherwood
D. Lewis
8.In an absorption column, the flooding velocity for random packing is ____ that for stacked/regular packing?
A. Greater than
B. Smaller than
C. Equal to
D. Greater than
9.In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed___?
A. q > 1
B. q < 1
C. q = 1
D. q > 1
10.With increase in temperature, the leaching rate increases due to___?
A. Decreased liquid viscosity
B. Increased diffusivity
C. Both A. and B.
D. Decreased liquid viscosity
11.Large scale drying of wheat is done in a _____ dryer?
A. Fluidised bed
B. Spouted bed
C. Tray
D. Fluidised bed
12.With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?
A. Increases
B. Decreases
C. Remain same
D. Increases
13.Which of the following is not fixed by the process requirements, in the design of absorbers ?
A. Flow rate of the entering gas
B. Composition of the entering liquid
C. Terminal concentrations of gas stream
D. Flow rate of the entering gas
14.Molecular sieves are regenerated by heating to ____ °C?
A. < 150
B. 200-330
C. > 500
D. < 150
15.Co-current absorbers are usually used when the gas to be dissolved in the liquid is _____?
A. Sparingly soluble
B. Highly soluble
C. A pure substance
D. Sparingly soluble
16.In triangular co-ordinates, the ternary composition point falls ____ of the triangle?
A. In the corners
B. Inside
C. On the sides
D. In the corners
17.The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if__?
A. NSc = 1
B. NSc = NPr = NLe
C. NPr = NLe
D. NSc = 1
18.During sensible cooling process ___?
A. Relative humidity decreases
B. Relative humidity increases
C. Wet bulb temperature decreases
D. Relative humidity decreases
19.The boiling points of pure components of a binary system __________ with increase in total pressure of the system ?
A. Decreases
B. Increases
C. Remains unchanged
D. Decreases
20.Large scale usage of flash distillation is practised in ___?
A. Soap manufacturing
B. Ammonia synthesis plant
C. Polymerisation industry
D. Soap manufacturing
21.To remove all the moisture from a wet solid it requires exposure to ____ air?
A. Perfectly dry
B. Highly humid
C. High temperature
D. Perfectly dry
22.The cooling effect in a cooling tower can be speeded up by ____?
A. Increasing the air velocity and area of exposed wet surface
B. Reducing the barometric pressure
C. Reducing the humidity of the air
D. Increasing the air velocity and area of exposed wet surface
23.The Knudsen diffusivity is proportional to (where, T = absolute temperature)?
A. ?T
B. T2
C. T
D. ?T
24.A natural draft cooling tower is filled with wooden grids, which covers about ____ percent of the tower height?
A. 15-Oct
B. 30-40
C. 70-80
D. 15-Oct
25.With increase in the liquid flow rate at a fixed gas velocity in a randomly packed counter current gas-liquid absorption column, the gas pressure drop___?
A. Decreases
B. Remains unchanged
C. Increases
D. Decreases
26.For the flow of gases through a capillary, with increase in temperature, the permeability ______ as per Knudsen law?
A. Increases
B. Decreases
C. Remain same
D. Increases
27.Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the _______ moisture?
A. Free
B. Unbound
C. Equilibrium
D. Free
28.For absorbing a sparingly soluble gas in a liquid, the___?
A. Gas side co-efficient should be increased
B. Liquid side coefficient should be increased
C. Gas side co-efficient should be decreased
D. Gas side co-efficient should be increased
29.The relative volatility of a binary mixture at the Azeotropic composition is?
A. 1-Jan
B. > 1
C. 0
D. 1-Jan
30.Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?
A. (De.t)1/2
B. (De/t)1/2
C. (4De/?t)1/2
D. (De.t)1/2
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