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Home » Engineering » Aptitude Test - 110
Hassan
1.The equation, NA = (DAB . Pt /RTZ) (y1 – y2) is for ____?
A. Steady state equimolar counter diffusion
B. Fick’s first law of diffusion
C. Steady state diffusion for stagnant case
D. Steady state equimolar counter diffusion
2.Coffee is prepared from coffee beans by leaching with___?
A. Cold water
B. Hot water
C. Dilute hot caustic solution
D. Cold water
3.Which of the following parameters remains constant during chemical dehumidification ?
A. Dry bulb temperature
B. Partial pressure of vapour
C. Wet bulb temperature
D. Dry bulb temperature
4.A slurry is to be dried to produce flaky solid. Which dryer would you recommend ?
A. Spray dryer
B. Drum dryer
C. Rotary dryer
D. Spray dryer
5.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
6.Dried finished product sampled from various parts of a ____ dryer exhibits nonuniformity in the moisture content?
A. Rotary
B. Tray
C. Freeze
D. Rotary
7.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
8.Large quantity of silica gel is normally dried in a __ dryer?
A. Freeze
B. Through circulation
C. Rotary vacuum
D. Freeze
9.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
10.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
11.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
12.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
13.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
14.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
15.Large scale drying of wheat is done in a _____ dryer?
A. Fluidised bed
B. Spouted bed
C. Tray
D. Fluidised bed
16.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
17.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
18.Molecular sieves are regenerated by heating to ____ °C?
A. < 150
B. 200-330
C. > 500
D. < 150
19.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
20.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
21.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
22.During sensible cooling process ___?
A. Relative humidity decreases
B. Relative humidity increases
C. Wet bulb temperature decreases
D. Relative humidity decreases
23.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
24.Large scale usage of flash distillation is practised in ___?
A. Soap manufacturing
B. Ammonia synthesis plant
C. Polymerisation industry
D. Soap manufacturing
25.Pick out the wrong statement?
A. The toughness of a material decreases, when it is heated
B. Crane hooks are normally made of wrought iron
C. Cold working of a metal decreases its fatigue strength
D. The toughness of a material decreases, when it is heated
26.Pick out the wrong statement?
A. Pure rubber is as useless as pure gold as a material of construction
B. Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
C. Copper has poor weldability
D. Pure rubber is as useless as pure gold as a material of construction
27.Pick out the wrong statement?
A. Wrought iron contains about 0.02% carbon
B. Wrought iron cannot be easily forged and welded
C. The chilled cast iron does not contain graphite
D. Wrought iron contains about 0.02% carbon
28.Pick out the correct statement?
A. Stainless steel is nothing but chromium coated steel
B. Hardening of a soft metal can be done by alloying it with another metal or non-metal
C. Plastic deformation of a material is its temporary distortion under the action of applied stress
D. Stainless steel is nothing but chromium coated steel
29.Pick out the wrong statemen?
A. Hardening makes the steel more brittle
B. High alloy steels contain more than 50% alloying element
C. 18/8 stainless steel is a magnetic steel
D. Hardening makes the steel more brittle
30.Pick out the wrong statement ?
A. Alloys are harder than their component elements
B. Presence of silicon in steel decreases its electrical resistance
C. Karbate is an acid resistant material of construction
D. Alloys are harder than their component elements
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