1000+ Chemical Engineering Basics MCQ for LIC AAO [Solved]

1. Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of
A. Lumps
B. Pellets
C. Briquettes
D. Sinter
Answer : B

2. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
A. Copper
B. Steel
C. Aluminium
D. Brass
Answer : A

3. 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

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

5. Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition?
A.
B.
C.
D.
Answer : C

6. Coarse grained steels have
A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness
Answer : B

7. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
A. T
B. 1/T
C. T²
D. 1/T²
Answer : A

8. The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.
A. Two
B. Four
C. Six
D. Eight
Answer : A

9. An abrupt and sudden fall in the reading of barometer is an indication of the
A. Storm
B. Rain
C. Clear weather
D. Cold wave
Answer : A

10. Which of the following phenomenon will exhibit the minimum heat transfer?
A. Boiling
B. Forced convection in air
C. Free convection in air
D. Conduction in air
Answer : D

11. Pick out the wrong statement.
A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties
B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness
C. Induction hardening and flame hardening techniques are also used for surface hardening
D. Martempering of a material is a hardening process
Answer : C

12. Property responsible for the talcum powder to cling to the skin is the
A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension
Answer : B

13. The co-ordination number in simple cubic structure is
A. 4
B. 6
C. 8
D. 12
Answer : B

14. Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
A. SiO2
B. Al2O3
C. MnO2
D. P
Answer : A

15. Ceramic compounds as compared to metallic compounds
A. Crystallise faster
B. Resist greater tensile stress at room temperature
C. Have higher melting temperature
D. Are better conductor of electricity at higher temperature
Answer : C

16. Upto the critical radius of insulation, added insulation, will
A. Increase the heat loss
B. Decrease heat loss and will have no effect beyond that
C. Decrease heat flux
D. Reduce convection heat loss compared to conduction heat less
Answer : B

17. __________ 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

18. __________ property of a material is determined by the Herbert Pendulum device.
A. Hardness
B. Tensile
C. Toughness
D. Compressive
Answer : A

19. Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
A. Slip
B. Fracture
C. Winning
D. Dislocation
Answer : D

20. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
A. Rigid
B. Tough
C. Ductile
D. Plastic
Answer : C

21. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
A. Linearly
B. Exponentially
C. Logarithmically
D. Inversely
Answer : A

22. LVDT used for displacement measurement is a/an __________ transducer.
A. Passive
B. Active
C. Capacitive
D. None of these
Answer : A

23. Thermal conductivity of a material does not depend upon its
A. Mass
B. Volume
C. Surface area
D. All 'a', 'b' & 'c'
Answer : D

24. For separating small pieces of metal from engine oil of a car, the best separating technique is the
A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation
Answer : C

25. Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same
A. Period increases
B. Period decreases
C. Group increases
D. Both 'b' & 'c'
Answer : D

26. The main charge in blast furnace is usually
A. Iron ore & coke
B. Iron ore, coke & air
C. Limestone, coke & iron ore
D. Limestone, sand & iron ore
Answer : C

27. Ganister contains maximum percentage of
A. FeO
B. SiO2
C. MgO
D. MnO2
Answer : B

28. Pick out the wrong statement.
A. A soft magnetic material should have high permeability and small area of hysteresis loop
B. Poisson's ratio of high melting point metals is more than unity
C. Solders generally melt at less than 185°C
D. Steel produced by B.O.F process is ideally suited for manufacturing flat product
Answer : B

29. Which of the following is the largest quantum of pressure?
A. 1 kg/cm²
B. 1 bar
C. 1 atmosphere
D. 1 kilo Pascal
Answer : C

30. If Reynolds number is greater than 1, then the
A. Viscous force is larger than the inertia force
B. Inertia force is larger than the viscous force
C. Inertia force is larger than the surface tension force
D. Inertia force is larger than the gravitational force
Answer : B

31. Pressure required to increase the density of water by about 1% is __________ atmosphere.
A. 10
B. 50
C. 200
D. 1000
Answer : C

32. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.
A. Impact strength
B. Percent elongation
C. Hardness
D. Both 'b' & 'c'
Answer : A

33. Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is
A. Black
B. Silver grey
C. Green
D. Yellow
Answer : B

34. Which of the following is preferred for riveting?
A. Lap joint
B. Butt joint
C. Either (A) or (B)
D. Neither (A) nor (B)
Answer : B

35. Steel balls are manufactured by
A. Sintering
B. Casting
C. Cold heading
D. Spinning
Answer : C

36. Maximum permissible air velocity in pipelines is about __________ metre/second.
A. 5
B. 10
C. 20
D. 40
Answer : B

37. Which of the following fastening devices has a head at one end and a nut fitted to the other?
A. Bolt
B. Stud
C. Top bolt
D. None of these
Answer : B

38. With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either (A) or (B), depends on the type of semi-conductor
Answer : A

39. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses
Answer : B

40. Spherical shape of mercury droplets is due to its
A. High viscosity
B. Low surface tension
C. High density
D. High surface tension
Answer : D

41. Suitability of steel for its use in cable is judged by its strength in
A. Tension
B. Compression
C. Torsion
D. Shear
Answer : A

42. Absolute zero pressure can be attained at a temperature of
A. 0°C
B. 50°K
C. 0°R
D. None of these
Answer : C

43. The cathode in an electrochemical cell always carries
A. Negative charge
B. Positive charge
C. Zero charge
D. Positive or negative charge depending upon the nature of the cell
Answer : A

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

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

46. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
A. Length of the pipe
B. Diameter of the pipe
C. Density of the fluid
D. Velocity of the fluid
Answer : A

47. A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place
A. The better insulation material should be put just next to pipe (i.e., inside)
B. The better insulating material should be put outside
C. Either of the insulating material could be put on either side
D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)
Answer : A

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

49. Hot extrusion of aluminium is done in the temperature range of __________ °C.
A. 550-600
B. 450-500
C. 350-400
D. 250-300
Answer : C

50. 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