chemical engineering Mcqs
6901. A hardness depth of about 3 mm can be achieved by induction hardness in ______________ seconds?
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A. 5

B. 100

C. 250

D. 500

6902. Air vessel provided in a reciprocating pump is for__________________?
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A. None of these

B. Making the friction in pipe uniform

C. Increasing the acceleration head

D. Decreasing the acceleration head

6903. Lenzs law results from the law of conservation of___________________?
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A. Momentum

B. Energy

C. None of these

D. Mass

6904. Hastelloy C is a good material of construction in chemical process industry, since it is ___________________?
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A. Light and resists attack by acids

B. Highly corrosion resistant and is readily fabricated

C. Relatively inexpensive although it can be fabricated with some difficulty

D. Corrosion resistant to most alkalis, particularly because of its copper content

6905. Unit of mass velocity is__________________?
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A. kg/m2. hr

B. kg/m3. hr

C. kg/m2

D. kg/hr

6906. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with__________________?
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A. Rubber

B. Lead or acid-proof bricks

C. Karbate

D. Acidic refractory

6907. Thermoplastic resins are those polymers, which____________________?
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A. Easily deform under pressure at high temperature

B. Cannot be moulded

C. None of these

D. Has decreased plasticity at increasing temperature

6908. Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water column in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm)?
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A. 12.6 H

B. H

C. 13.6 H

D. 14.6 H

6909. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the ______________ stress?
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A. None of these

B. Yield point

C. Ultimate

D. Proof
6910. The most distinguished property of malleable cast iron is its high_________________?
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A. Hardness

B. Ductility

C. Malleability

D. None of these

6911. At a given temperature, the volume of a gas dissolved in a solvent _______________ with increase in pressure?
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A. Decreases

B. Increases

C. Remains unchanged

D. May increase or decrease; depends on the gas

6912. Water flow rate in a pipe of 3.5 metres diameter can be most economically and conveniently measured by a/an ________________?
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A. Orificemeter

B. Rotameter

C. Venturimeter

D. Pitot tube
6913. Steel balls for ball bearings are generally made of ______________ steel?
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A. Cast

B. Carbon chrome

C. Stainless

D. Free carbon

6914. Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?
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A. None of these

B. Silicon steel

C. Molybdenum steel

D. Chromium steel

6915. The material of construction of bearings is__________________?
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A. Babbitt metal

B. Cast iron

C. Pig iron

D. Steel

6916. Path followed by water jet issuing from the bottom of a water tank will be a__________________?
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A. Horizontal straight line

B. Zig-zag path (which is geometrically undefined)

C. Parabola (vertex being at the opening)

D. Hyperbola

6917. The continuity equation___________________?
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A. Represents the conservation of mass

B. None of these

C. Is dependent upon the viscosity of the fluid

D. Is independent of the compressibility of the fluid

6918. _______________ is a donor impurity for semi-conductors ?
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A. Gallium

B. Antimony

C. Boron

D. None of these

6919. Karbate is____________________?
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A. A mixture of iron dust and saw dust

B. Carbon impregnated with resin (usually Bakelite)

C. An acid resistant material

D. Both B. and C.
6920. Which of the following finds the least commercial use ?
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A. High carbon steel

B. Pure iron

C. Low carbon steel

D. High silicon iron

6921. In case of a pipe of constant cross-sectional area, the maximum fluid velocity obtainable is___________________?
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A. Dependent on fluid density

B. Dependent on fluid viscosity

C. Dependent on its cross-sectional area

D. The velocity of sound
6922. Cast iron detachable joint is used in __________ pipes.
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A. Cast iron

B. Reinforced cement concrete

C. Steel

D. Asbestos cement

6923. Bog iron used for the adsorption of H2S from coke oven gas is___________________?
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A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)

B. None of these

C. Iron impregnated with resin (usually Bakelite)

D. Carbon free iron

6924. Cast iron is__________________?
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A. Used for making shock resisting parts

B. Having compressive strength more than its tensile strength

C. Manufactured in cupola and is brittle

D. All A., B. & C.
6925. Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of__________________?
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A. High silicon cast iron

B. Nickel clad steel

C. Aluminium

D. Stainless steel or glass lined steel
6926. The equivalent diameter for pressure drop calculation for a fluid flowing through a rectangular cross-section channels having sides x & y is given by_________________?
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A. (x + y)/2xy

B. 2xy/(x + y)

C. (x + y)/xy

D. xy/(x + y)

6927. What is the ratio of the velocity at the axis of the pipe to the mean velocity of flow in case of pipe flow under viscous condition ?
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A. 0.67

B. 1

C. 2

D. 0.5

6928. Specific speed of a centrifugal pump depends upon the ______________ head?
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A. None of these

B. Delivery

C. Manometric

D. Suction

6929. Centrifugal pump made of pyrex or glass cant be used to pump___________________?
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A. Brine

B. Alkaline solutions

C. Dilute H2SO4 at room temperature

D. Milk and fruit juices

6930. A pipe has a porous section of length L as shown in the figure. Velocity at the start of this section of V0. If fluid leaks into the pipe through the porous section at a volumetric rate per unit area q(x/L)2, what will be axial velocity in the pipe at any x?? Assume incompressible one dimensional flow i.e., no gradients in the radial direction ?
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A. VX = V0 + q (x3/L2D)

B. VX = V0 + 2q (x2/LD)

C. VX = V0 + ?q (x3/L2)

D. VX = V0 + (4/3) q (x3/L2D)
6931. Metalloid is_______________________?
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A. An element, which exhibits the properties of both metal & non metal

B. Highly electronegative in nature

C. An alloy

D. All A., B. & C.

6932. The dimension of surface tension is________________?
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A. ML-2

B. ML-2T

C. MT-2

D. MLT-2

6933. For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to____________________?
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A. R

B. R0.5

C. R2

D. R4
6934. Iron alloyed with carbon upto 2% is called___________________?
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A. Pig iron

B. Wrought iron

C. None of these

D. High carbon steel

6935. A bed consists of particles of density 2000 kg/m3. If the height of the bed is 1.5 metres and its porosity 0.6, the pressure drop required to fluidise the bed by air is_________________?
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A. 25.61 kPa

B. 21.13 kPa

C. 11.77 kPa

D. 14.86 kPa

6936. Anodic material used for the cathodic protection of underground buried steel pipeline is_________________?
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A. Zinc or magnesium

B. Brass

C. Bronze

D. Nickel or copper

6937. The most economical flow control valve for use with large diameter pipes is a__________________?
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A. Needle valve

B. Butterfly valve

C. Globe valve

D. None of these

6938. Spark plugs are made of______________________?
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A. Carborundum

B. Metallic carbides

C. Corundum

D. High alumina ceramic
6939. Which of the following is the hardest material ?
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A. Topaz

B. Quartz

C. Fluorite

D. Corundum
6940. Bearings subjected to light load are made of________________?
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A. Silicon bronze

B. Phosphorous bronze

C. White metal

D. Monel

6941. The crystal structure of most of the common metals is_____________________?
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A. Cubic

B. Orthorhombic

C. None of these

D. Hexagonal

6942. The general relationship between speed N, head H, power P and discharge Q for a centrifugal pump is_________________?
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A. Q?N : H?N2 : P?N3

B. Q?N3 : H?N : P?N2

C. Q?N : H?N3 : P?N2

D. Q?N2 : H?N3 : P?N

6943. Which of the following is the most prone to atmospheric corrosion ?
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A. Tin

B. Silver

C. Iron

D. Copper

6944. The lift of a balloon is_________________?
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A. Due to the weight of the atmospheric air, that it displaces

B. Increased, as it rises to a higher altitude

C. Not dependent on the temperature of the atmosphere

D. None of these

6945. Carbon is present in steel wholly in the__________________?
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A. Combined form

B. Free state as graphite

C. Both A. and B.

D. Neither A. nor B.

6946. In Newtons law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?
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A. First power

B. Second power

C. Inverse

D. Square root
6947. Bernoullis equation is dependent on the__________________?
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A. Third law of thermodynamics

B. None of these

C. Law of conservation of momentum

D. First law of thermodynamics

6948. Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower_________________?
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A. Price

B. Thermal conductivity

C. Corrosion resistance

D. Abundant availability
6949. Wrought iron is having very high ________________?
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A. Susceptibility to changes in its properties by heat treatment

B. Hardness

C. Corrosion resistance

D. Strength

6950. In cold working of metal as compared to its hot working____________________?
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A. Yield stress, hardness and fatigue strength is not at all affected

B. Cracks and blow holes are eliminated

C. Appreciable strain hardening is produced

D. Ductility and impact strength improves