chemical engineering chemical engineering basics Mcqs
1. With increase in steam pressure, its specific volume decreases ____________________?
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A. Slowly first and then rapidly

B. Rapidly first and then slowly

C. Exponentially

D. Linearly

2. Lead is poured into the joint between two _______________ pipes ?
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A. Cast iron

B. Concrete

C. Mild steel

D. Asbestos cement

3. _______________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten ?
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A. Stellite

B. Cermet

C. Alnico

D. High speed steel

4. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ?
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A. Cobalt, chromium & tungsten

B. Cobalt, zirconium & molybdenum

C. Cobalt, chromium & nickel

D. Molybdenum, tungsten & chromium

5. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be_____________________?
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A. 3.75

B. 2.5

C. 1.25

D. 5
6. Maximum permissible sulphur content in steel is ______________ percent ?
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A. 0.505

B. 0.055

C. 0.805

D. 0.015
7. In practice, the compression ratio of compression-ignition (CI) engine ranges from ______________________?
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A. 15 to 25

B. 40 to 55

C. 60 to 70

D. 5 to 10

8. The refrigerant freon-12 is chemically_______________________?
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A. CCl3F

B. CCl2F2

C. CCl4F

D. CClF3

9. Property responsible for the talcum powder to cling to the skin is the__________________?
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A. Adhesion

B. Capillary action

C. Cohesion

D. Surface tension

10. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poissons ratio of the rod is___________________?
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A. 0.25

B. 0.33

C. 0.44

D. 0

11. A pycnometer is used for the measurement of________________________?
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A. Concentration of a solution

B. Composition of alloys

C. Flow rate of molten metal

D. Specific gravity of a liquid
12. When the wavelength of incident X-rays increases, the angle of diffraction__________________?
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A. Remain constant

B. Decreases

C. Shows no systematic variation

D. Increases

13. Which of the following has the least value of ultimate tensile strength (UTS) ?
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A. Cast iron

B. High carbon steel

C. Wrought iron

D. Medium carbon steel

14. Which of the following is the most wear resistant grade of carbide used for the cutting tools ?
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A. Nickel carbide

B. Tungsten carbide

C. Aluminium carbide

D. Iron carbide

15. Chlorine acts as a bleaching agent only in the presence of ______________________?
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A. Moisture

B. Pure oxygen

C. Dry air

D. Sunlight

16. Which of the following is prone to cup and cone fracture ?
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A. Cast iron

B. Soft brass

C. Round specimen of ductile metal

D. Flat tensile specimen of ductile metal

17. Which of the following is not an ore of copper ?
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A. Cryolite

B. Azurite

C. Chalcopyrite

D. Malachite

18. Uniform ramming of sand in green sand moulding process leads to____________________?
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A. Less sand expansion type of casting defect

B. Reduced chance of gas porosity

C. Greater dimensional stability of the casting

D. Uniform flow of molten metal into the mould cavity

19. Which of the, following is not associated with the functioning of a petrol engine ?
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A. Carburettor

B. Compression ignition system

C. Otto cycle

D. Spark plug

20. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _____________________?
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A. Acid and weak base

B. Base and strong acid

C. Base and weak acid

D. None of these

21. Good design of the casing of a centrifugal pump aims at minimising the __________________________?
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A. Cavitation

B. Frictional losses

C. Kinetic energy loss

D. Static head

22. Damage to metal surface by mechanical action is called____________________?
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A. Erosion

B. Pitting

C. None of these

D. Corrosion

23. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet ?
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A. Alumina

B. Bakelite

C. Tungsten carbide

D. Zirconia

24. Bad odour in sanitary latrines is reduced by periodically sprinkling_____________________?
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A. Lime powder

B. Bleaching powder

C. None of these

D. Aluminium sulphate

25. A reduction in thermal resistance during heat transfer does not occur in the___________________?
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A. None of these

B. Conduction heat transfer by reduction in the material thickness and increase in the thermal

C. Radiation heat transfer by increasing the temperature and reducing the emissivity

D. ductivity

E. Convection heat transfer by stirring the fluid and cleaning the heating surface

26. Quartz is a ________________ material ?
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A. Ferromagnetic

B. Piezoelectric

C. Diamagnetic

D. Ferroelectric

27. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to____________________?
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A. Cube of time

B. Time

C. Square root of time

D. Square of time

28. Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?
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A. Left as such to protect the surface

B. Removed by acid pickling

C. Hammered into the surface

D. Removed with coarse emery cloth

29. Brazing is the joining of metals_____________________?
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A. Without melting the base metal

B. With a non-ferrous filler

C. Both A. & B.

D. Neither A. nor (B)

30. The refractory lining of the bottom in a basic electric arc furnace is made of___________________?
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A. Alumina

B. Magnesia

C. Silica

D. Fireclay

31. At the point of boundary layer separation in fluid flow, the _____________________?
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A. Shear stress is maximum

B. Velocity gradient is flat

C. Shear stress is zero

D. Density variation is maximum

32. Addition of _______________ to steel does not help in improving its machinability ?
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A. Phosphorous

B. Silicon

C. Sulphur

D. Lead

33. M10 index of coke indicates its____________________?
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A. Impact strength

B. Abrasion resistance

C. Compressive strength

D. Hardness

34. Runge-Kutta method is used to solve a/an __________________________?
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A. Linear differential equation

B. None of these

C. Simultaneous non-linear equation

D. Ordinary differential equation of nth order

35. Increasing sulphur content in pig iron tends to make it ________________?
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A. Hard

B. Ductile & malleable

C. Tough

D. Soft

36. Oxyacetylene reducing flame is used while carrying out welding on___________________?
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A. Mild steel

B. High carbon steel

C. Alloy steel

D. Grey cast iron

37. Which of the following is an ore dressing operation ?
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A. Smelting

B. Roasting

C. None of these

D. Classification
38. Heating the Hypo-eutectoid steels to 30C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?
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A. Tempering

B. Normalising

C. Hardening

D. Annealing
39. Nickel and ______________ are the alloying element added in steel to increase its toughness?
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A. Silicon

B. Vanadium

C. Chromium

D. Molybdenum

40. Increase in the entropy of a system represents the_____________________?
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A. Decrease in system pressure

B. Increase in the availability of energy

C. Degradation of energy

D. Increase in the temperature

41. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always____________________?
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A. Decreases

B. Increases to a maximum before decreasing

C. Remain constant

D. Increases
42. The process of removal of scale formed during hot rolling of steel is termed as_________________?
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A. Pickling

B. Shot blasting

C. Descaling

D. Skimming

43. ______________ circuit is most commonly used to measure strain with the help of a strain gauge?
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A. Voltage balancing potentiometric

B. Simple current sensitive

C. None of these

D. Ballast

44. Hydrogen in liquid steels is dissolved_________________?
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A. In the molecular form

B. As tiny gas bubbles

C. In the atomic form

D. In the ionic form

45. The minimum carbon content in steel should be ____________________ percent for it to respond to a hardening treatment ?
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A. 0.4

B. 0.8

C. 0.6

D. 0.2
46. Cast iron contains ____________________ percent carbon?
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A. 2.5

B. 4.75

C. 3.75

D. 5.25

47. Unit of surface tension in S.I. unit is_________________?
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A. Watt/m

B. Newton/m2

C. Joule/m

D. Joule/m2
48. Wrought iron is not____________________?
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A. Having maximum tensile strength along the lines of slag distribution

B. Weldable easily

C. Having uniform strength in all directions

D. Ductile & resistant to corrosion/rusting

49. Machinability of hard alloys and tool steels is improved by_____________________?
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A. Normalising

B. Spheroidising

C. Tempering

D. Annealing
50. ______________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently ?
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A. Expansion

B. Bell and Spigot

C. Flanged

D. Collar