Chemical Engineering Basics 1000+ MCQ with answer for RBI Grade B officer

1. The unit of gc is
A. lb_m/lb_f. ft/sec²
B. lb_f/lb_m. ft/sec²
C. ft/sec²
D. lb_m/lb_f. sec²/ft
Answer : A

2. Secondary hardening in steels arises out of the
A. Precipitation of fine alloy carbides at high temperatures
B. Refinement of ferrite grain size by working
C. Decomposition of retained austenite upon heat treatment
D. Precipitation of complex inter-metallic upon heat treatment
Answer : C

3. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
A. Stainless steel
B. Mild steel
C. High speed steel
D. High carbon steel
Answer : C

4. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A. 1/k
B. k
C. k²
D. 1/k²
Answer : B

5. Tip of the match stick contains a mixture of
A. K + S
B. K + S + K₂Cr₂O₇
C. S + K₂Cr₂O₇ + White P
D. None of these
Answer : C

6. __________ wire is never used for making the heating element.
A. Nichrome
B. Kanthal
C. Invar
D. None of these
Answer : C

7. 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

8. Dislocation cross-slip is difficult in those materials, which have
A. Large number of slip systems
B. High work hardening rate
C. Coarse grain size
D. Low stacking fault energy
Answer : D

9. Pick out the wrong statement about coating/electroplating of metals.
A. Phosphate coating is used as an excellent base for paints & enamels
B. Phosphate coating is less corrosion resistant than chromate coating
C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode
D. Calorising is the process of coating steel with chromium
Answer : D

10. Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.
A. X-rays
B. ?-rays
C. ?-rays
D. ?-rays
Answer : B

11. 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

12. Pick out the correct statement.
A. Materials exhibiting high elasticity obey Hooke's law
B. The elastic behaviour of rubber under compression is the same as its behaviour under tension
C. The damping capacity of a material is due to its plastic deformation
D. The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations
Answer : B

13. __________ temperature remains constant during adiabatic saturation process of unsaturated air.
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
Answer : C

14. In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).
A. Mechanical
B. Overall
C. Volumetric
D. Impeller
Answer : A

15. Corrosion is
A. A physical phenomenon
B. A chemical phenomenon
C. Same as erosion
D. An uncontrollable phenomenon
Answer : B

16. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?
A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
D. None of these
Answer : D

17. Water hammer is caused in steam carrying pipelines, because of
A. Partial condensation of steam
B. Vibration of the pipeline
C. High degree of superheat of steam
D. Its exposure to torrential rain
Answer : A

18. Increase in the entropy of a system represents the
A. Degradation of energy
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature
Answer : A

19. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
A. High vacuum
B. Zero pressure
C. 0°K
D. Earth's centre
Answer : B

20. __________ can replace tungsten in high speed steel.
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
Answer : C

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

22. 'Cryogenics' is concerned with the generation & use of low temperature in the range of
A. 0°K to 123°K
B. 0°C to - 123°C
C. 0°C to - 273°C
D. 0°K to 273°K
Answer : A

23. Which of the following does not discharge the dust collected as a dry solid?
A. Electrostatic precipitator
B. Wet scrubber
C. Bag filter
D. Gravity settling chamber
Answer : B

24. 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

25. Often earing defects are found during deep drawing operation, because the
A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anisotropy due to its texture
Answer : C

26. Which of the following is not used as a bearing material?
A. Copper-lead alloys
B. Babbitts
C. Bronzes
D. Cermets
Answer : D

27. Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
A. Conductor
B. Insulator
C. Semi-conductor
D. None of these
Answer : C

28. Age hardening is connected with
A. Babbitt metal
B. Gun metal
C. Stainless steel
D. Duralumin
Answer : D

29. 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

30. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of
A. Steel
B. Glass wood
C. Copper
D. Fireclay bricks
Answer : B

31. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
A. Concentration
B. Velocity
C. Temperature
D. None of these
Answer : A

32. Filler material used in welding should have __________ as compared to the parent metal to be welded.
A. Lower melting temperature
B. Same melting temperature
C. Same composition
D. Both 'b' & 'c'
Answer : D

33. 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

34. Blast furnace slag is mainly molten
A. Sand
B. Magnesium silicate
C. Calcium silicate
D. Iron pyrite
Answer : C

35. Water flow in the river during flood can be categorised as the __________ flow.
A. Unsteady uniform
B. Unsteady non-uniform
C. Steady uniform
D. Steady non-uniform
Answer : B

36. Routing in production, planning & control is concerned with the
A. Sequence of operation to be performed
B. Progress of work performed
C. Authorisation of work to be performed
D. Balancing of load on machines
Answer : A

37. Closeness of packing is maximum in case of __________ crystal lattice.
A. Face centred
B. Simple cubic
C. Body centred
D. None of these
Answer : A

38. In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be
A. Conduction
B. Radiation
C. Natural convection
D. Forced convection
Answer : B

39. Mild steel has __________ crystal lattice structure.
A. Face centred cubic (fcc)
B. Body centred cubic (bcc)
C. Orthorhombic
D. Cubic
Answer : B

40. Superheating of steam is done at constant
A. Enthalpy
B. Entropy
C. Pressure
D. Volume
Answer : C

41. A jet engine turbine blade is normally manufactured by
A. Forging
B. Shell moulding
C. Investment casting
D. Pressure die casting
Answer : C

42. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
A. 370
B. 340
C. 320
D. 300
Answer : A

43. __________ metal is used as a bearing liner material.
A. Pewter
B. White
C. Babbitt
D. Gun
Answer : C

44. Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.
A. Annealing
B. Toughening
C. Work hardening
D. Tempering
Answer : A

45. 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

46. 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

47. Ultimate strength in tension as compared to that in shear for steel is
A. Half
B. One third
C. One and half times
D. One fourth
Answer : C

48. Magnetic permeability of iron is increased by its
A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling
Answer : B

49. 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

50. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.
A. 5-10
B. 1000-1500
C. 120-500
D. 1500-3000
Answer : C