1000+ Chemical Engineering Basics Multiple Choice Question Answer [Solved]

1. Reduction in the grain size reduces the __________ of the material.
A. Fatigue resistance
B. Tensile strength
C. Creep resistance
D. All (A), (B) & (C)
Answer : D

2. The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Beryllium
Answer : A

3. Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A. Invar
B. Hastelloy
C. Duralumin
D. Monel metal
Answer : A

4. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
A. Tension
B. Shear
C. Compression
D. Bending & tension
Answer : A

5. A material is capable of resisting softening at high temperature, because of its property termed as
A. Hot temper
B. Hot hardness
C. Fatigue
D. Creep
Answer : B

6. Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
Answer : D

7. __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.
A. Borosilicate
B. High silica
C. Supermax
D. Lead
Answer : C

8. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.
A. 10
B. 20
C. 30
D. 40
Answer : D

9. Which of the following is an acidic constituent of B.F. slag?
A.
B. FeO
C. MgO
D. CaO
Answer : A

10. Natural water contains approximately __________ percent of heavy water.
A. 0.015
B. 0.71
C. 1.2
D. 3.5
Answer : A

11. At 100% relative humidity, the dew point temperature of moist air is
A. Less than the wet bulb temperature
B. More than the wet bulb temperature
C. Equal to the wet bulb temperature
D. Equal to the ambient temperature
Answer : B

12. The most important consideration in value engineering is the
A. Profit maximisation
B. Customer satisfaction
C. Cost reduction
D. Process improvement
Answer : B

13. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
A. Range is 15°F
B. Approach is 10°F
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

14. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
A. Manganese
B. Silicon
C. Nickel
D. Chromium
Answer : A

15. 'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and
A. Petrol
B. LPG
C. Light hydrocarbon gases (e.g. butane or propane)
D. None of these
Answer : A

16. Silicon in steel
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
D. All 'a', 'b' & 'c'
Answer : D

17. The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
A. Wetness
B. Mass flow rate
C. Both 'a' & 'b'
D. Neither 'a' nor 'b'
Answer : C

18. The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is
A. More
B. Less
C. Same
D. More but less than the diameter of bolt
Answer : A

19. Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
A. 20
B. 200
C. 500
D. 2000
Answer : B

20. Austempering process results in the formation of __________ structure.
A. Martensitic
B. Bainitic
C. Carburised
D. Stressed
Answer : B

21. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit
Answer : A

22. Limestone is added in the blast furnace (during pig iron manufacture) to
A. Form slag by combining with impurities
B. Supply heat by undergoing exothermic reaction with impurities
C. Reduce the coke consumption
D. Reduce slag viscosity
Answer : A

23. 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

24. Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
A. Steel
B. Lignite
C. Water
D. Lime stone
Answer : C

25. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
A. Increases
B. Decreases
C. Remain constant
D. Increases to a maximum before decreasing
Answer : A

26. Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?
A. Aluminium
B. Copper
C. Titanium
D. Stainless steel
Answer : C

27. Projection welding & stud welding is categorised as the __________ welding.
A. Pressure
B. Thermit
C. Resistance
D. Arc
Answer : C

28. In case of simple harmonic motion, displacement is proportional to the
A. Velocity
B. Acceleration
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

29. Biological shield in a nuclear reactor is generally provided to protect against the
A. ?-rays
B. ?-rays
C. Gamma rays & neutrons
D. Electrons
Answer : C

30. Preheating before welding is done to
A. Make the plate softer
B. Burn oil & grease sticking to plate surfaces
C. Avoid plate distortion
D. Prevent cold cracks
Answer : D

31. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
A. 1
B. 10
C. 30
D. 50
Answer : B

32. Identify the false statement
A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
B. Pitting corrosion is usually very localised
C. Hydrogen embrittlement is facilitated by tensile stress
D. Stress corrosion cracking is facilitated by tensile stress
Answer : A

33. Tin based white metals are used, where bearings are subjected to
A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
Answer : A

34. Wrought iron is never shaped by
A. Casting
B. Cold working
C. Forging
D. Welding
Answer : A

35. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
A. Ambient
B. Dry bulb
C. Dew point
D. Wet bulb
Answer : C

36. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
A. Steel
B. Glass
C. Rubber
D. Brass
Answer : A

37. More than 95% of __________ is present in corundum.
A. SiO₂
B. Al₂O₃
C. CaSiO₂
D. MgO
Answer : B

38. Most important property of steels for use in automobile bodies is the
A. Formability
B. Yield strength
C. Toughness
D. Resilience
Answer : A

39. Identify the correct statement.
A. Sphlerite is zinc oxide
B. The first law of the thermodynamics is stated as ?E = ?Q - ?W
C. Lead can be produced in a blast furnace
D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite
Answer : C

40. Gratings is associated with the measurement of
A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness
Answer : A

41. The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
A. Cyaniding
B. Sherardizing
C. Spheroidising
D. None of these
Answer : A

42. Which of the following materials has the poorest electrical conductivity?
A. Carbon
B. Aluminium
C. Silver
D. Stainless steel
Answer : A

43. Tempering of a material does not improve its
A. Machinability
B. Toughness
C. Internal stress level
D. Softness
Answer : A

44. Notched bar test is used for testing the __________ of a material.
A. Impact strength
B. Endurance limit
C. Machinability
D. Corrosion resistance
Answer : A

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

46. The elastic strain in copper is due to the
A. Motion of dislocations
B. Stretching of atomic bonds
C. Breakage of atomic bonds
D. None of the above
Answer : A

47. The ratio of the shear stress to the principal stress on a principal plane is
A. 0
B. 1
C. 1/2
D. 1/3
Answer : A

48. Pick out the correct statement.
A. Hot worked materials are subjected to annealing to remove internal stresses
B. Annealing of steel hardens it slightly
C. Normalising of a material induces stresses
D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
Answer : D

49. The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of __________ mm.
A. 0.001
B. 0.01
C. 0.002
D. 0.02
Answer : C

50. Which of the following fastening devices has its both ends threaded?
A. Bolt
B. Stud
C. Set screw
D. Split nut
Answer : B