Chemical Engineering Basics 1000+ MCQ with answer for IIFT

1. The surface tension of a liquid, at critical temperature is
A. Indeterminate
B. Zero
C. Infinity
D. Same as that at any other temperature
Answer : B

2. When an isolated thermodynamic system executes a process,
A. Work is done
B. Heat transfer takes place
C. Mass flow occurs across the boundary of the system
D. No chemical reaction takes place within the system
Answer : D

3. Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.
A. Wet bulb
B. Dry bulb
C. Saturation
D. Dew point
Answer : A

4. __________ is the hardest material out of the following.
A. Boron carbide
B. Tungsten carbide
C. Hardened steel
D. Silicon carbide
Answer : A

5. __________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.
A. Mach
B. Reynolds
C. Froude
D. Weber
Answer : C

6. Which of the following metals reacts violently with water?
A. Mercury
B. Sodium
C. Calcium
D. Magnesium
Answer : B

7. Which of the following low melting alloy containing bismuth and lead is used for electric fuse?
A. Wood's metal
B. Babbitt metal
C. Monel metal
D. Duralumin
Answer : A

8. The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.
A. Runner
B. Cylinder
C. Mold
D. None of these
Answer : A

9. While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A. Low impact strength
B. High flexibility
C. Better finish and surface appearance
D. High plastic deformation
Answer : A

10. Which of the following materials has the least scrap value?
A. Aluminium
B. Stainless steel
C. Brass
D. Copper
Answer : B

11. The swift cup test evaluates the following property of a sheet metal.
A. Stretchability
B. Drawability
C. Bendability
D. None of these
Answer : B

12. Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
A. Sorbite
B. Bainite
C. Martensite
D. Troostite
Answer : B

13. A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
A. 150
B. 200
C. 300
D. 400
Answer : B

14. __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
A. Lancing
B. Shot peening
C. Slugging
D. Spinning
Answer : B

15. A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².
A. 6
B. 18
C. 38
D. 52
Answer : B

16. Percentage of argon (by volume) in dry atmospheric air is about
A. 0.09
B. 0.3
C. 0.57
D. 0.94
Answer : D

17. Increase in temperature, in general results in the
A. Decrease in the viscosities of both liquids & gases
B. Increase in the viscosities of both liquids & gases
C. Increase in the viscosity of liquids and decrease in that of gases
D. Decrease in the viscosity of liquids and increase in that of gases
Answer : D

18. Electrochemical corrosion can occur, only if __________ is present in contact with metal.
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium
Answer : C

19. For the irreversible reaction, C_a+ 2C = C_a C₂ , ? H°298 = - 60000 J . mole_-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
A. 30,000 J
B. 60,000 J
C. 90,000 J
D. 2,40,000 J
Answer : C

20. M10 index of coke indicates its
A. Compressive strength
B. Hardness
C. Abrasion resistance
D. Impact strength
Answer : C

21. Fatigue resistance of a material is measured by the
A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit
Answer : D

22. Which of the following metals is the most prone to work hardening?
A. Brass
B. Aluminium
C. Copper
D. Lead
Answer : A

23. A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is
A. Lead
B. Glass
C. Mica
D. Silver
Answer : A

24. All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.
A. Deuterium
B. Hydrogen
C. Neon
D. Helium
Answer : B

25. L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Answer : B

26. The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then
A. Wet bulb temperature=dry bulb temperature
B. Wet bulb temperature=dew point temperature
C. Saturation temperature=dew point temperature
D. All 'a', 'b' & 'c'
Answer : D

27. Gross national product (GNP) means the total value of __________ in a country.
A. Goods produced
B. Gold reserve
C. Earning of the citizens
D. Taxes paid
Answer : A

28. Eutectoid composition of carbon steel at room temperature is
A. Cementite
B. Pearlite
C. Martensite
D. Ferrite
Answer : B

29. Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
Answer : B

30. __________ is a non volatile film forming constituent of a paint.
A. Thinner
B. Dryer
C. Drying oil
D. None of these
Answer : C

31. Brazing is the joining of metals
A. Without melting the base metal
B. With a non-ferrous filler
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

32. Globular form of cementite is formed during the __________ process.
A. Spheroidising
B. Hardening
C. Annealing
D. Normalising
Answer : B

33. Highest cutting speed is achieved by the __________ tool material.
A. High speed steel
B. Carbide
C. Cast alloy
D. Plain carbon steel
Answer : B

34. __________ is not used as a material of construction in thermocouples.
A. Alumel
B. Rhodium
C. Constantan
D. Duralumin
Answer : D

35. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
A. Work hardening
B. Bauschinger effect
C. Creeping effect
D. Stress recovery effect
Answer : B

36. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A. 0
B. 100
C. 50
D. None of these
Answer : B

37. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?
A. 9,100
B. 13,000
C. 7,000
D. 2,550
Answer : A

38. Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
A. H
B. H/2
C. H/4
D. H/6
Answer : D

39. A compact estimate about the amount of materials handling between various work stations is obtained from the
A. Gantt chart
B. Bin chart
C. String diagram
D. Travel chart
Answer : D

40. __________ of test specimens is not involved in any hardness testing method.
A. Fracture
B. Indentation
C. Wear
D. Scratch
Answer : A

41. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
A. 9 : 1
B. 17 : 1
C. 23 : 1
D. 29 : 1
Answer : B

42. Which of the following metals cannot be hot worked at room temperature?
A. Zinc
B. Nickel
C. Lead
D. Tin
Answer : B

43. Internal energy of a gas obeying Van-Der- Waals equation of state, [p + (a/v²)] (V - b) = RT, depends upon its
A. Pressure & temperature
B. Pressure & specific volume
C. Temperature & specific volume
D. Temperature only
Answer : A

44. Pick out the wrong statement.
A. Weldability of high carbon steel is poorer compared to low carbon steel
B. Invar is a magnetic alloy
C. Magnetic permeability of the diamagnetic material is less than one
D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature
Answer : B

45. The product of a commercial direct reduction process is
A. Liquid iron
B. Solid iron
C. Sponge iron
D. Iron saturated with carbon
Answer : C

46. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.
A. Hot rolled mild
B. Cold rolled mild
C. Forged
D. Machinable stainless
Answer : B

47. Which of the following can be manufactured using powder metallurgy techniques?
A. Brake linings
B. Bearings
C. Carbide tool tips
D. All 'a', 'b' and 'c'
Answer : D

48. The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
A. 3
B. 7
C. 11
D. 15
Answer : C

49. Pick out the wrong statement.
A. For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1
B. For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
C. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
D. Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm
Answer : B

50. Maximum consumption of limestone is in the __________ industry.
A. Iron and steel
B. Cement
C. Glass
D. Fertiliser
Answer : D