chemical engineering Mcqs
6951. N. second/m2 is___________________?
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A. Equivalent to one poise

B. The S.I. unit of kinematic viscosity

C. Equivalent to one stoke

D. The S.I. unit of dynamic viscosity
6952. German silver is an alloy of copper, nickel and________________?
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A. Zinc

B. Tin

C. Silver

D. Lead

6953. The head loss in turbulent flow in a pipe varies_________________?
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A. Inversely as the square of the diameter

B. Directly as the velocity

C. Approximately as the square of the velocity

D. Inversely as the square of the velocity

6954. It is possible to integrate an automatic flow controller to a________________?
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A. None of these

B. Flow nozzle

C. Venturimeter

D. Rotameter
6955. Cast iron compared to steel is better in__________________?
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A. Fluidity & castability

B. Malleability

C. Ductility

D. Strength

6956. When iron is rusted, it is__________________?
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A. None of these

B. Oxidised

C. Reduced

D. Converted to a fine powder

6957. Mild steel storage vessels are suitable for the storage of___________________?
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A. Sulphuric acid (25%)

B. Anhydrous ammonia

C. Hydrochloric acid (95%)

D. Fatty acids

6958. During ageing of fluid carrying pipes, the__________________?
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A. Friction factor increases linearly with time

B. Pipe becomes smoother with use

C. Absolute roughness decreases with time

D. Absolute roughness increases linearly with time
6959. When the head pumped against is less than the head of the fluid used for pumping, the usual device is a/an______________________?
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A. Injector

B. Blower

C. Ejector

D. Airlift
6960. The hydraulic radius for flow in a rectangular duct of cross-sectional dimension H, W is___________________?
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A. 2HW/(H + W)

B. HW/4 (H + W)2

C. ?(HW/?)

D. HW/2 (H + W)2
6961. Visco-elastic behaviour of materials which is time dependent is common in______________?
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A. Non-crystalline organic polymer

B. Non-crystalline solids

C. Crystalline solid

D. Plastics

6962. Ferric stainless steels compared to austenitic stainless steels________________?
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A. Are less ductile and hence less suitable for cold pressing

B. Have lower corrosion resistance

C. All A., B. and C.

D. Are harder to fabricate

6963. Which of the following produces maximum pressure difference for transportation of gases ?
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A. Vacuum pumps

B. Compressors

C. Blowers

D. Fans

6964. Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making___________________?
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A. Chisels

B. Bolts

C. Studs

D. Nuts

6965. Corrosion resisting properties of cast iron are significantly improved by the addition of 12 15% of___________________?
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A. All A., B. & C.

B. Tungsten

C. Silicon

D. Vanadium

6966. Caustic soda is transported in _____________ lined containers ?
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A. Glass

B. Nickel

C. Neoprene

D. Either B. or C.
6967. White cast iron as compared to grey cast iron is ________________?
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A. Very brittle

B. Very hard

C. All A., B. & C.

D. More durable

6968. The maximum head that can be developed by a single impeller is _____________ ft?
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A. 1000

B. 25

C. 250-300

D. 100

6969. Vycor, a widely used material for making thermal wells in temperature measurement, is a_______________?
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A. Metallic alloy

B. Glass

C. Thermosetting plastic

D. Cermet

6970. A Newtonian liquid (? = density, ? = viscosity) is flowing with velocity v? in a tube of diameter D. Let ?p be the pressure drop across the length L. For a laminar flow, ?p is proportional to_________________?
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A. L?V/D2

B. D?v2/L

C. L?v2/D

D. ?V/L

6971. Silicon percentage in iron castings to have maximum hardness should be about__________________?
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A. 0.8

B. 2.5

C. 0.3

D. 0.5

6972. _____________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working?
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A. Twinning

B. Solid solution hardening

C. Strain ageing

D. Screw dislocation

6973. For flow past a flat plate, if x? is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to________________?
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A. x

B. 1/x

C. 1/?x

D. ?x
6974. Hydrochloric acid is stored in a ________________vessel?
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A. Rubber lined steel

B. Lead lined steel

C. Stainless steel

D. Cast iron

6975. Stainless steel contains_________________?
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A. Chromium and nickel

B. Vanadium

C. Aluminium

D. Copper

6976. Brine solution is stored/treated in _______________ lined vessels/pipes?
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A. Rubber

B. Glass

C. Lead

D. Nickel
6977. Specific speed for a centrifugal pump is___________________?
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A. N ?Q/H3/4

B. N ?Q/H2/3

C. N3D5/H1/3

D. N ?Q/H

6978. Nickel as a material of construction__________________?
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A. Is used as an alloying element for both ferrous & non-ferrous alloys

B. Is paramagnetic below 415 C (its Curie temperature)

C. Diamagnetic

D. Has a body centred cubic (bcc) crystal lattice structure

6979. Most of the common metals have ______________ crystal structure?
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A. Hexagonal

B. Orthorhombic

C. None of these

D. Cubic
6980. Bush bearings are made of______________________?
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A. Mild steel

B. White metal alloys

C. None of these

D. Phosphorous bronze
6981. Alinco, which is a aluminium-cobalt-nickel steel, is used for making __________________?
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A. Chemical equipments

B. Powerful magnets

C. Surgical instruments

D. Boiler tubes

6982. Mild steel is a/an ______________ steel?
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A. High carbon

B. Medium carbon

C. High alloy

D. Low carbon
6983. Pressure drop for laminar fluid flow through a circular pipe is given by__________________?
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A. 32 (?LV/gc D2)

B. 4f (L/D) (v2/2gc) ?

C. (fL?/D) (v2/2gc)

D. 16/NRe

6984. Wrought iron is a suitable material of construction for handling _____________ solutions?
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A. Dilute acidic

B. None of these

C. Concentrated acidic

D. Alkalis & alkaline
6985. ____________ does not change during phase transformation processes like sublimation, melting & vaporisation?
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A. All (A), B. & (C)

B. Gibbs free energy

C. Entropy

D. Internal energy

6986. An equipotential line is _____________ to the velocity vector at every point?
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A. Tangential

B. None of these

C. Normal

D. Parallel

6987. Nickel base alloys with ______________ are known as monel metal?
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A. Copper

B. Tin

C. Zinc

D. Molybdenum

6988. 18/8 stainless steel means, that it contains__________________?
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A. 18% chromium and 8% molybdenum

B. 18% nickel and 8% chromium

C. 18% molybdenum and 8% chromium

D. 18% chromium and 8% nickel
6989. Each term in Bernoulli?s equation represents the _____________ of the fluid?
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A. Energy per unit weight

B. Energy per unit mass

C. None of these

D. Force per unit mass

6990. Sewage sludge is an example of the ______________ fluid?
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A. Pseudo plastic

B. Newtonian

C. Bingham plastic

D. Dilatent

6991. Evaporator used for concentrating tomato juice is made of __________________?
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A. Stainless steel-glass lined

B. Brass

C. Cast iron-rubber lined

D. Nickel

6992. Which of the following is an undesirable characteristic of a refrigerant ?
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A. None of these

B. It should be non-explosive

C. Its vapor pressure at the condenser temperature should be very high

D. It should have a sub-atmospheric vapor pressure at the temperature in refrigerator coils
6993. Brass container is suitable for storing__________________?
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A. H2SO4 (95%)

B. Phosphoric acid (95%)

C. Aqueous ammonia

D. Beer
6994. Which of the following units is not present in both the vapor compression refrigeration system and absorption refrigeration system ?
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A. Refrigerator

B. Condenser

C. Compressor

D. Expansion valve

6995. _____________ moulding process cannot be used for thermoplastic plastics?
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A. Injection

B. None of these

C. Compression

D. Extrusion

6996. A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?
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A. Newtonian

B. Incompressible

C. Non-Newtonian

D. Ideal

6997. Containers made of high silicon cast iron (14% Si) are not suitable for the storage of ____________________?
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A. Phosphoric acid (95%) & sulphuric acid (95%)

B. Hydrochloric acid (concentrated)

C. Acetic acid

D. Benzoic & boric acids

6998. The softest material just next to talc in the Mhos scale is___________________?
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A. Quartz

B. Fluorite

C. Feldspar

D. Gypsum
6999. Beehive coke ovens are made of ________________ bricks?
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A. Silica

B. Silicon carbide

C. Corundum

D. Fireclay

7000. How many atoms are there per unit cell in a body centred cubic lattice system ?
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A. 5

B. 2

C. 6

D. 3