chemical engineering chemical engineering basics Mcqs
701. Natural water contains approximately ______________ percent of heavy water?
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A. 1.2

B. 0.71

C. 0.015

D. 3.5

702. Cassiterite is an ore of_________________?
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A. Tin

B. Chromium

C. Lead

D. Molybdenum

703. Normalising of a casting does not__________________?
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A. Reduce segregation

B. Refine its grain structure

C. Improve its mechanical properties

D. Induce stresses in it
704. Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode________________?
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A. Is much cheaper than the cathodic base material to be guarded against corrosion

B. All A, B. & C.

C. Is exemplified by magnesium plate

D. Occurs higher in the electro-chemical series of metals

705. Dryness fraction of dry steam is_________________?
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A. 0

B. 0.5

C. ?

D. 1
706. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?
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A. V2/A

B. V/A

C. V/A2

D. V2/A2
707. Which of the following if present in iron ore, enhances its value ?
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A. Alkali oxide

B. Alumina

C. Lime & Magnesia

D. None of these

708. Which of the following material handling equipments is not suitable for moving materials in varying paths ?
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A. Truck

B. Belt conveyor

C. Crane

D. Hand trolley

709. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the _________________?
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A. Partial pressure of water vapour is less than the total pressure

B. Humidity is < 100% & dew point temperature of air has not reached

C. Dew point temperature of air has not reached & air is not saturated fully

D. Air is fully saturated
710. In a counter flow heat exchanger, hot fluid enters at 170C & leaves at 150C, while the cold fluid enters at 50C & leaves at 70C. The arithmetic mean temperature difference in this case is ______________ C?
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A. 120

B. 20

C. 60

D. ?
711. For an ideal gas, Cp Cv is____________________?
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A. (3/2) R

B. 0

C. R

D. -R

712. Yield strength of a polycrystalline metal with an average grain size d, is proportional to ____________________?
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A. d-1

B. d

C. d-1/2

D. d1/2

713. Which of the following are considered applications of ultrasonic testing ?
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A. Measurement of material thickness

B. None of the above

C. Determination of elastic constant

D. Detection of defects in metal
714. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?
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A. 4600 J

B. 230 J

C. 2.3 106 J

D. 2300 J
715. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Youngs modulus, G = Modulus of rigidity or shear modulus v = Poissons ratio) ?
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A. E = G (1 + v)

B. E = 2G (1 + 2v)

C. E = G (1 + v)/2

D. E = 2G (1 + v)
716. Liquor poisoning generally occurs due to the presence of _______________ in it?
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A. Ethyl alcohol

B. Carbonic acid

C. Impurities

D. Methyl alcohol
717. Constituents of stellite are ____________________?
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A. Zinc, aluminium & nickel

B. Cobalt, chromium & tungsten

C. Nickel, cobalt & vanadium

D. Zinc, copper & nickel

718. In case of a, centrifugal pump, the ratio h1/h2 is termed as the _____________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)?
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A. Impeller

B. Volumetric

C. Mechanical

D. Overall

719. A material being tested for endurance strength is subjected to the _____________ load?
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A. Impact

B. Static & dynamic

C. Completely reversed

D. Dynamic

720. LVDT used for displacement measurement is a/an _______________ Transducer?
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A. Passive

B. Capacitive

C. Active

D. None of these

721. Dislocation cross-slip is difficult in those materials, which have___________________?
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A. Low stacking fault energy

B. Large number of slip systems

C. High work hardening rate

D. Coarse grain size

722. Heat transfer by ______________ is almost absent in case of fluidised bed drying operation?
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A. Radiation

B. Conduction

C. Convection

D. Both B. & C.

723. Pick out the wrong statement ?
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A. Geothermal energy is a non-conventional source of energy

B. Mass is converted into energy in both nuclear fission & fusion reaction

C. Inhalation of mercury vapour is not harmful for human beings

D. Inhalation of arsenic causes cancer

724. Silicon percentage in acid resistant cast iron is about ___________________?
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A. 14

B. 20

C. 8

D. 4
725. The atmospheric temperature during melting of ice/snow (in the atmosphere)_________________?
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A. Decreases

B. Remain same

C. Increases

D. May increase or decrease; depends on the altitude where snow melts

726. Lead is added to 60:40 brass primarily to improve_________________?
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A. Machinability

B. Corrosion resistance

C. Fluidity

D. Strength

727. Steel produced from phosphatic iron is _______________ in nature?
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A. Tough

B. Malleable

C. Ductile

D. Brittle
728. Cold heading or upsetting is categorised as the ________________ process ?
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A. Rolling

B. Bending

C. Forging

D. Extrusion

729. Dikes are low height walls made around the storage vessels meant for storing hazardous & inflammable material (e.g., petroleum products). Volume of dikes is equal to (where, V = volume of the storage vessel) ?
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A. 3V

B. 2V

C. V

D. V/2

730. ____________________ metal is used as a bearing liner material?
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A. Gun

B. Babbitt

C. Pewter

D. White

731. Brazing filler metal used for joining steel plates_________________?
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A. Is copper

B. Is copper phosphorous alloy

C. Melts below the melting points of base metals

D. Melts below 300C

732. Pick out the wrong statement ?
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A. The quality of X-rays can be controlled by varying the anode-cathode voltage

B. gas by X-rays

C. Crystal structure of a material can be studied by an electron microscope

D. The X-rays cannot be deflected by electric field unlike cathode rays

E. The intensity of X-rays can be measured by ionisation current produced due to the ionisation

733. Gas turbine normally employs a constant _______________ cycle?
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A. Volume

B. Temperature

C. Pressure

D. None of these

734. The most abundant metal present in the earths crust is__________________?
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A. Copper

B. Iron

C. Titanium

D. Aluminium
735. A material subjected ________________ must have high resilience?
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A. Vibration

B. Tension

C. Shock loading

D. Fatigue

736. Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________________ method?
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A. Sinking fund

B. Multiple straight line

C. Diminishing balance

D. Sum of the years digit

737. Notched bar test is used for testing the _________________ of a material?
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A. Endurance limit

B. Corrosion resistance

C. Machinability

D. Impact strength
738. The unit of gc is ___________________?
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A. lbf/lbm. ft/sec2

B. lbm/lbf. ft/sec2

C. lbm/lbf. sec2/ft

D. ft/sec2

739. _______________ is not a case hardening process ?
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A. Annealing

B. Cyaniding

C. Nitriding

D. Carburising
740. Melting point & boiling points of liquid oxygen are respectively 218.8C & 183C, while the same for liquid nitrogen is 210C & 195.8C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8 ?
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A. R

B. C

C. F

D. K

741. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of__________________?
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A. 25/2

B. 23/2

C. 23

D. 21/3

742. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?
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A. Fatigue

B. Creep

C. Toughness

D. Tensile strength

743. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of________________?
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A. Glass wood

B. Steel

C. Fireclay bricks

D. Copper

744. What is the range of tempering temperature (C) for most of the materials ?
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A. 350-450

B. 200-300

C. 75-100

D. 500-600

745. Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its________________?
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A. Resistance to vegetable acids as the tin plate are commercially used in canning industry

B. None of these

C. Abundant availability

D. Lower cost

746. Regeneration of molecular sieve requires it to be heated to a temperature of about __________________ C?
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A. 200-300

B. 1000-1100

C. 600-800

D. 80-120

747. Pick out the wrong statement?
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A. Processing of thermosetting plastics is ideally done by injection moulding

B. Stretch forming is a process of cold drawing

C. Mass production of seamless pipes are done by electrical resistance welding (ERW)

D. Processing of thermoplastics is ideally done by compression moulding

748. Out of the following substances, one ton of ______________ will store the maximum heat for a rise of 30C in temperature ?
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A. Lignite

B. Steel

C. Lime stone

D. Water
749. Ammonia gas can be dried by___________________?
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A. Quick lime

B. Concentrated H2SO4

C. PCl5

D. CaCl2

750. Surface tension of a liquid_________________?
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A. All A, B. & C

B. Decreases with rise in temperature

C. Is responsible for the spherical shape of an isolated liquid drop

D. Is due to intermolecular forces of cohesion