chemical engineering Mcqs
6851. Working of a _______________ pump characterises mixed flow?
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A. Piston

B. Diaphragm

C. None of these

D. Turbine
6852. Duriron is__________________?
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A. Acid resistant, brittle and very hard

B. ansion

C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal

D. All A., B. and C.

E. High silicon iron

6853. Bernoullis equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoullis equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?
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A. B, D, E

B. A, B, E

C. A, C, D

D. A, D, E

6854. _____________ iron is produced, when molten pig iron is chilled suddenly?
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A. Wrought

B. White cast

C. None of these

D. Grey cast

6855. The friction factor is___________________?
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A. None of these

B. Always inversely proportional to the Reynolds number

C. Not dimensionless

D. Not dependent on the roughness of the pipe

6856. Post weld heat treatment is done by____________________?
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A. Tempering

B. Normalising

C. Solution annealing

D. Stress relieving
6857. Which of the following crystal structures characterises the ferritic stainless stee l?
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A. None of these

B. Face centred cubic

C. Simple hexagonal

D. Body centred cubic
6858. Buckingham-? theorem states that in any physical problem including n quantities having m dimensions, the quantities can be arranged into _____________ independent dimensionless parameters?
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A. m

B. n/m

C. n

D. n-m
6859. Drag co-efficient in hindered settling is _____________ that in free settling?
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A. Less than

B. Not necessarily greater than

C. Always greater than

D. Equal to

6860. For an ideal fluid flow, Reynolds number is___________________?
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A. 0

B. 100

C. 2100

D. ?
6861. Power requirement of fans having constant wheel diameter varies _____________ fan speed?
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A. None of these

B. As cube of

C. Directly as

D. As square of

6862. At constant temperature and pressure, for one mole of a pure substance, the ratio of the free energy to the chemical potential is____________________?
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A. Zero

B. One

C. Negative

D. Infinity

6863. Galvanising is generally done on___________________?
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A. Non-ferrous metals

B. Cast iron

C. Low carbon steel

D. Stainless steel

6864. Very high sulphur in pig iron makes ___________________?
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A. All A., B. & C.

B. Its hard and machinable

C. Its brittle and malleable

D. Its casting unsound
6865. In frictional fluid flow, the quantity, (P/?) + (V2/2gc) + gz/gc) is___________________?
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A. None of these

B. Constant along a streamline

C. Not constant along a streamline

D. Increased in the direction of flow

6866. Carbon is present in the combined form (carbide) in case of______________________?
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A. Pig iron

B. Ferroalloys

C. All A., B. & C.

D. Steel

6867. Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of________________?
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A. Stainless steel

B. High silicon (14%) iron

C. Aluminium

D. Copper

6868. As the impurities are oxidised, the melting point of iron___________________?
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A. Remains unchanged

B. Decreases

C. Increases

D. May increase or decrease; unpredictable

6869. Glass is corroded by________________?
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A. None of these

B. Phosphoric acid

C. Sulphuric acid

D. Fluorine (dry or wet)
6870. Work done may be calculated by the expression ? p dA for _____________ processes ?
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A. Non-flow reversible

B. Adiabatic

C. Both A. and B

D. Neither A. nor B

6871. Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?
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A. Endurance limit

B. Ultimate tensile strength (U.T.S.)

C. Elastic limit

D. None of these

6872. Which of the following metals in not used for coating of the base metal to guard it against corrosion ?
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A. Aluminium

B. Magnesium

C. Cadmium

D. Lead

6873. Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its__________________?
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A. Machinability

B. Compressive strength

C. Corrosion resistance

D. Tensile strength

6874. The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is__________________?
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A. 2

B. 1

C. < 1

D. > 1

6875. Biological shield in a nuclear power reactor is made of________________?
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A. Zircaloy

B. Cadmium

C. Concrete

D. Steel

6876. One ton of refrigeration capacity is equivalent to the heat removal rate of____________________?
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A. 200 BTU/minute

B. 200 BTU/day

C. 50 kcal/hr

D. 200 BTU/hr

6877. Velocity of liquid hydrocarbon fuels in a pipeline cannot be measured by magnetic flowmeters, because their ______________ is very low/small?
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A. Specific gravity

B. Thermal conductivity

C. Electrical resistivity

D. Electrical conductivity
6878. Minimum fluidisation velocity for a specific system depends upon the___________________?
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A. Particle size

B. Fluid viscosity

C. Density of both the particle & the fluid

D. All A., B. and C.
6879. The chlorinator used in the manufacture of DDT is made of___________________?
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A. Glass

B. Teflon

C. Glass lined steel

D. Bakelite

6880. Rubber latex is an example of a ______________ fluid?
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A. Pseudo plastic

B. Newtonian

C. Dilatent

D. Bingham plastic

6881. Which of the following has the least value of ultimate tensile strength (UTS) ?
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A. High carbon steel

B. Wrought iron

C. Medium carbon steel

D. Cast iron
6882. Entropy, which is a measure of the disorder of a system, is__________________?
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A. Independent of pressure

B. Independent of temperature

C. Zero at absolute zero temperature for a perfect crystalline substance

D. All A, B. & C

6883. Presence of even very minute amount (say 0.1%) of ______________ in copper, reduces its electrical conductivity very seriously?
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A. Bismuth

B. Arsenic

C. Antimony

D. Both B. and C.
6884. The damage/deterioration of metals by the ______________ action of fluids is called erosion?
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A. Abrasive

B. Corrosive

C. Both A. & B.

D. Neither A. nor B.

6885. Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about_______________?
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A. One twelfth

B. Half

C. One third

D. One fifth
6886. Tin coating on metals is not done by_____________________?
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A. Electro-deposition

B. Hot dipping

C. Spraying

D. Powder metallurgy
6887. With increase in the carbon percentage in the steel, its__________________?
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A. All A., B. and C.

B. Tensile strength increases

C. Hardness increases

D. Ductility reduces

6888. The equivalent diameter for fluid flow through square cross section channel of side x, for pressure drop calculation purpose is given by____________________?
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A. x

B. 4x

C. ?x

D. 2x

6889. Manganese in steel affects its__________________?
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A. Hardness

B. Tensile strength

C. None of these

D. Ductility
6890. Tin in its pure form is used for making_______________?
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A. Foil for wrapping cheese

B. Collapsible tubes for toilet preparations

C. All A., B. and C.

D. Cans for food packing

6891. Lead pipe is_____________________?
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A. Having very low elastic limit resulting in permanent deformation from either mechanical or

B. rmal strain

C. All A., B. and C.

D. Especially resistant to solutions containing H2SO4

E. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)

6892. Carbon content in steel is ___________________ percent?
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A. 0.1-2

B. 6-Apr

C. 0.001-0.01

D. 4-Feb

6893. For the production of very high vacuum, a _____________ pump is normally used?
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A. Diffusion

B. Centrifugal

C. Jet ejector

D. Piston

6894. Creeping flow around a sphere is defined, when particle Reynolds number is___________________?
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A. < 0.1

B. < 500

C. < 2100

D. > 2.5

6895. At low Reynolds number______________?
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A. Viscous forces are unimportant

B. Viscous forces control and inertial forces are unimportant

C. Viscous forces control

D. Gravity forces control

6896. If in a flow field, between any two points, then the flow must be___________________?
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A. Unsteady, incompressible, irrotational

B. Steady, compressible and along a streamline

C. Steady, compressible, irrotational

D. Steady, incompressible, irrotational
6897. 1m3 of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be ?
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A. 174 K

B. 274 K

C. 154 K

D. 35 K

6898. Steel pipes are normally manufactured by ______________ process?
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A. Forging

B. Electroforming

C. Cold working

D. Extrusion
6899. Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70% ?
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A. Karbate

B. Steel

C. Nickel

D. Cast iron

6900. Muntz metal is a/an alloys of____________________?
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A. Copper & zinc

B. Magnesium & tin

C. Ferrous material

D. Lead & tin