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

1. The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
A. 140
B. 180
C. 240
D. 280
Answer : D

2. __________ has a negative co-efficient of linear expansion.
A. Iron
B. Copper
C. Rubber
D. Nickel
Answer : B

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

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

5. Which of the following has the highest modulus of elasticity (about 7 × 10⁶ kg/cm²)?
A. High speed steel
B. Stainless steel
C. Tungsten carbide
D. Superalloys
Answer : C

6. Window panes of aeroplanes are normally made of
A. Perspex (PMMA)
B. Teflon (PTFE)
C. Bakelite (phenol formaldehyde)
D. Polystyrene
Answer : A

7. Earing is a defect found in steels after the following metal working operation.
A. Extrusion
B. Rolling
C. Deep drawing
D. Wire drawing
Answer : C

8. Good design of the casing of a centrifugal pump aims at minimising the
A. Cavitation
B. Frictional losses
C. Kinetic energy loss
D. Static head
Answer : C

9. Alloy powder manufactured by the following process have spherical shapes.
A. Electrochemical deposition
B. Gaseous reduction
C. Atomisation
D. Mechanical attrition
Answer : C

10. Which of the following equipments is used for liquid dispersion?
A. Packed column
B. Venturi scrubber
C. Bubble cap plate column
D. Wetted wall column
Answer : B

11. Temperature attained in soldering of metals is about __________ °C.
A. 150-300
B. 400-500
C. 650-800
D. 1000-1100
Answer : A

12. 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

13. Wavelength of radiation emitted by a body depends on the __________ of its surface.
A. Temperature
B. Area
C. Nature
D. All 'a', 'b' & 'c'
Answer : A

14. The activity of pure hydrogen gas at 1000°C and 5 atm pressure
A. Is always less than 1
B. Is always greater than 1
C. Can be 5
D. Depends on the choice of the standard state
Answer : D

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

16. Heating of ferromagnetic materials to a temperature above Curie temperature makes it
A. Insulator for heat & electricity transmission
B. Ferritic
C. Behave like paramagnetic materials
D. Superconductor
Answer : C

17. Air-petrol ratio for maximum power generation in spark ignition engine is about
A. 6 : 1
B. 12 : 1
C. 18 : 1
D. 24 : 1
Answer : B

18. Cold chisels hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Answer : B

19. Unit of viscosity in CGS system is
A.
B.
C.
D.
Answer : A

20. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium
A. Nitrate
B. Sulphate
C. Carbonate
D. Chloride
Answer : A

21. A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.
A. Neutral
B. Ideal
C. Buffer
D. Zero pH
Answer : C

22. 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

23. Laser welding is widely employed in the _________ industries.
A. Electronic
B. Structural
C. Process
D. Heavy
Answer : A

24. Corrosion of metals cannot be prevented by its
A. Tempering
B. Chromising
C. Aluminising
D. Alloying
Answer : A

25. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
A. A
B. D
C. 1/A
D. 1/A²
Answer : C

26. During sensible cooling of air, its wet bulb temperature
A. Decreases but dew point remains constant
B. Increases but dew point remains constant
C. Increases & the dew point decreases
D. Decreases & the dew point increases
Answer : B

27. Isotropic materials have the same __________ in all directions.
A. Induced stresses
B. Density
C. Elastic properties
D. Thermal properties
Answer : C

28. With increase in compression ratio, the volumetric efficiency of air compressor
A. Increases
B. Decreases
C. Remain same
D. May increase or decrease (depends on the suction pressure)
Answer : A

29. 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

30. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
A. Low temperature of
B. High temperature of
C. High % of CO in
D. High % of CO₂ in
Answer : C

31. Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?
A. Cresylic acid
B. Xanthaies
C. Pine oil
D. All 'a' 'b' & 'c'
Answer : B

32. Which of the following are considered applications of ultrasonic testing?
A. Determination of elastic constant
B. Detection of defects in metal
C. Measurement of material thickness
D. None of the above
Answer : B

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

34. Which of the following is used to produce draught in the locomotive boilers?
A. Chimney
B. Induced draught fan
C. Forced draught fan
D. Steam jet arrangement
Answer : D

35. Brittleness induced due to the presence of sulphur in steel can be reduced by adding
A. Manganese
B. Magnesium
C. Vanadium
D. Copper
Answer : A

36. 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

37. Unbreakable crockeries are made from __________ polymers.
A. Polystyrene
B. Melamine
C. Polystyrene
D. Polyurethane
Answer : D

38. Starting friction is low in case of the __________ lubrication.
A. Boundary
B. Hydrodynamic
C. Hydrostatic
D. Mixed/semi-fluid
Answer : C

39. Shaft/rotor speed is most accurately measured by a
A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer
Answer : C

40. To counteract the bad effects of strain hardening on a cold formed part, it must be
A. Tempered
B. Normalised
C. Annealed
D. Hardened
Answer : C

41. 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

42. 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

43. A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec² is
A. 8.82
B. 9.81
C. 10.88
D. 0.95
Answer : A

44. Maraging steels derive their strength from the following mechanism:
A. A fine, highly dislocated and strong martensite
B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc
C. Fine dispersions of alloy carbides in a ferrite matrix
D. Fine dispersions of C nucleated on dislocations in austenite
Answer : A

45. Tumbling is the process of improving the __________ of the materials/parts.
A. Surface finish
B. Fatigue limit
C. Creep limit
D. Surface cleanliness
Answer : D

46. Magnesium is present in
A. Haemoglobin
B. Chlorophyll
C. Hypo solution
D. None of these
Answer : B

47. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
A. Percentage elongation
B. Brinell hardness
C. Tensile strength
D. All 'a', 'b' & 'c'
Answer : A

48. A reduction in thermal resistance during heat transfer does not occur in the
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emissivity
D. None of these
Answer : C

49. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
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
Answer : D

50. The underground well of a biogas plant is called the
A. Septic tank
B. Oxidation well
C. Digestor
D. Lagoon
Answer : C