Chemical Engineering Basics MCQ Solved Paper for SBI PO

1. Common salt is produced from sea water in India generally by the __________ method.
A. Freeze drying
B. Solar evaporation
C. Electrolytic
D. None of these
Answer : B

2. The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
Answer : C

3. Dowtherm is a
A. High temperature heating medium (a petroleum product)
B. Product of coal tar distillation
C. Very heat sensitive material
D. None of these
Answer : A

4. Out of the following, the most malleable material is
A. Copper
B. Aluminium
C. Wrought iron
D. Lead
Answer : D

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

6. In a totally irreversible isothermal expansion process for an ideal gas, ?E = 0, ?H = 0. Then ?Q and ?S will be
A. ?Q = 0, ?S=0
B. ?Q = 0, ?S = +ve
C. ?Q = 0, ?S = -ve
D. ?Q = +ve, ?S= +ve
Answer : B

7. A dense structure of grinding wheel is not used for the
A. Ductile material
B. Hard materials
C. Brittle materials
D. Finishing cuts
Answer : A

8. Dryness fraction of dry steam is
A. 0
B. ?
C. 1
D. 0.5
Answer : C

9. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
A. Frequency
B. Amplitude
C. Damping
D. None of these
Answer : A

10. 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

11. Lead is poured into the joints between two __________ pipes.
A. Cast iron
B. Steel
C. Concrete
D. Plastic
Answer : A

12. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
A. Manganese
B. Phosphorous
C. Magnesium
D. Chromium
Answer : C

13. In the acid Bessemer process, the hot metal should have the following composition.
A. S < 0.05% and P < 0.05%
B. S < 0.05% and P < 1.5%
C. S < 0.05% and P > 1.5%
D. S > 1.5% and P < 0.05%
Answer : A

14. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability?
A. Lead
B. Copper
C. Aluminium
D. Wrought iron
Answer : A

15. A material being tested for endurance strength is subjected to the __________ load.
A. Impact
B. Completely reversed
C. Dynamic
D. Static & dynamic
Answer : B

16. 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

17. Oxyacetylene reducing flame is used while carrying out welding on
A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel
Answer : C

18. During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to
A. Time
B. Square root of time
C. Square of time
D. Cube of time
Answer : B

19. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
A. Output & fineness
B. Velocity
C. Both (A) & (B)
D. None of these
Answer : C

20. Change in volume of metals from absolute zero temperature to their melting points is
A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals
Answer : A

21. Use of flux during soldering is done to
A. Increase fluidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
D. Full up the joint gap
Answer : B

22. Ferromagnetic materials owe their properties to __________ inner sub-shells.
A. Completely filled
B. Partially filled
C. Equally filled
D. Vacant
Answer : B

23. One of the methods of purification of leach liquor is ion exchange, which involves
A. Exchange between two liquid phases
B. Exchange between a gaseous phase and a liquid phase
C. Exchange between a liquid phase and an organic resin phase
D. Exchange between a solid phase and a gas phase
Answer : C

24. The substance used as a smoke screen in warfare is
A. C2H2
B. SiCl4
C. P2O5
D. PCl5
Answer : B

25. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?
A. A, C, B, D
B. D, B, C, A
C. D, C, B, A
D. D, A, B, C
Answer : B

26. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the
A. Water alkalinity & leakage
B. Hydrazine addition during feed water treatment
C. Release of non-condensable gas from water in the boiler
D. Scale formation
Answer : C

27. Dislocations are __________ defects.
A. Point
B. Line
C. Volume
D. None of these
Answer : B

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

29. Fire in fuel gas pipelines is extinguished most effectively by
A. Spraying water
B. Blanketting the area with nitrogen atmosphere
C. Fire fighting foam
D. None of these
Answer : B

30. Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
A.
B.
C.
D.
Answer : C

31. A jig is used while __________ a hole.
A. Boring
B. Counter boring
C. Drilling
D. Enlarging
Answer : C

32. Which one can be directly solidified from gaseous state without entering into liquid state?
A. Helium
B. Oxygen
C. Carbon dioxide
D. None of these
Answer : C

33. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?
A. Zirconia
B. Alumina
C. Bakelite
D. Tungsten carbide
Answer : D

34. 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

35. Wrought iron is not
A. Ductile & resistant to corrosion/rusting
B. Weldable easily
C. Having uniform strength in all directions
D. Having maximum tensile strength along the lines of slag distribution
Answer : C

36. Particle nature of cathode rays is proved due to the fact that they
A. Travel in a straight line
B. Get deflected by magnetic electric field
C. Produce fluorescence
D. Heat the exposed material
Answer : B

37. In case of water (Prandtl number ? 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
A. Less
B. More
C. Equal
D. Unpredictable
Answer : A

38. Which of the, following is not associated with the functioning of a petrol engine?
A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle
Answer : A

39. Which one of the following is incombustible?
A. H2
B. CCl4
C. C2H2
D. S
Answer : B

40. The main reducing agent in iron blast furnace is
A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air
Answer : B

41. 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

42. Which of the following is not a characteristic observed in material failure by fatigue fracture?
A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initiation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Answer : B

43. Plasma is
A. A high temperature neutral gas
B. Nothing but ionised gas
C. A source of steady and highest controllable pressure
D. Formed at very low temperature
Answer : B

44. Vernier calipers cannot be used to measure the
A. I.D. & O.D. of the shaft
B. Thickness of parts
C. Depth of holes
D. Clearance between two mating surfaces
Answer : D

45. Rain drops falling through atmospheric air attain limited terminal velocity, because of
A. Upward thrust due to air
B. Viscous force exerted by air
C. Surface tension effects of water
D. Force of gravity
Answer : B

46. __________ 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

47. Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
A. Scratch
B. Indentation
C. Dynamic
D. Rebound
Answer : A

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

49. The most detrimental impurity in high pressure boiler feed water is
A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity
Answer : C

50. According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is
A. 180°
B. 212°
C. 32°
D. 273°
Answer : A