Chemical Engineering Basics MCQ Solved Paper for RRB JE

1. Which one is neutral in character?
A. N₂O₄
B. N₂O
C. N₂O₅
D. N₂O₃
Answer : B

2. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
A. Parabolic
B. Hyperbolic
C. Straight line
D. None of these
Answer : A

3. Pick out the wrong statement.
A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld
B. True stress is given by, ? = ?E (1 + ?E), where ?E and ?E are engineering stress and engineering strain respectively
C. Phosphorous can be easily recovered in the iron blast furnace
D. High residual stress at the surface is beneficial for fatigue properties of a material
Answer : C

4. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
A. Silicon carbide
B. Corundum
C. Aluminium oxide
D. Boron carbide
Answer : C

5. Consumable electrodes are used in the __________ welding.
A. Gas
B. Arc
C. Thermit
D. Resistance
Answer : B

6. 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

7. Shrinkage allowance on pattern is provided to compensate for shrinkage when the
A. Metal changes from liquid state to solid state at freezing temperature
B. Solid phase temperature drops from freezing temperature to the room temperature
C. Liquid metal temperature drops from pouring temperature to room temperature
D. Liquid metal temperature drops from pouring temperature to freezing temperature
Answer : B

8. A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to
A. ?(Particle diameter)
B. Particle diameter
C. (Particle diameter)²
D. (Particle diameter)³
Answer : B

9. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
A. 1
B. 1.4
C. 1.5
D. Y = C_p/C_v
Answer : A

10. 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

11. The majority charge carriers in p-type silicon are
A. Free electrons
B. Ions
C. Conduction electrons
D. Holes
Answer : D

12. 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

13. A steam carrying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
A. Increase
B. Decrease
C. Remain unaffected
D. May increase or decrease; depends on the thickness of each layer
Answer : C

14. Corona discharge is related to the operation of a/an
A. Induction motor
B. Electrostatic precipitator
C. Fast breeder reactor
D. Magneto hydrodynamic generator (MHD)
Answer : B

15. The difference between gross & net calorific values of fuel is due to the
A. Sensible heat carried away by the flue gases
B. Heat carried away by the steam from the moisture content of the fuel
C. Heat lost by radiation
D. Heat carried away by steam from the combustion of hydrogen in the fuel
Answer : D

16. 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

17. 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

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

19. 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

20. Fibre reinforced plastic (FRP) are
A. Made of glass fibre and thermoplastic resins
B. Anisotropic
C. Made of thermosetting resin and glass fibre
D. Both 'b' & 'c'
Answer : D

21. Which of the following material handling equipments is not suitable for moving materials in varying paths?
A. Hand trolley
B. Belt conveyor
C. Crane
D. Truck
Answer : B

22. Screws are specified by their __________ diameters.
A. Minor
B. Major
C. Pitch
D. None of these
Answer : B

23. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
A. More
B. Equal
C. Less
D. Double
Answer : A

24. A material subjected __________ must have high resilience.
A. Shock loading
B. Vibration
C. Fatigue
D. Tension
Answer : A

25. X-rays are
A. Positively charged
B. Negatively charged
C. Neutral
D. Of higher wavelength than visible light
Answer : C

26. Function of fusible plug in a boiler is to
A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All (A), (B) & (C)
Answer : B

27. Which of the following is a boiler accessory
i.e., not a boiler mounting?
A. Blow off cock
B. Feed check valve
C. Feed water pump
D. Stop valve
Answer : C

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

29. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
A. Pitot tube
B. Hot wire anemometer
C. Rotameter
D. Stroboscope
Answer : A

30. __________ is used for tying the steel columns to concrete foundation.
A. Grouting
B. Eyebolt
C. Anchor bolts
D. Refractory castables
Answer : C

31. __________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.
A. Collar
B. Flanged
C. Bell and Spigot
D. Expansion
Answer : B

32. Which of the following materials does not form adherent oxide film on surface?
A. Copper
B. Nickel
C. Aluminium
D. Gold & silver
Answer : D

33. Pick out the wrong statement
A. Processing of thermosetting plastics is ideally done by injection moulding
B. Processing of thermoplastics is ideally done by compression moulding
C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
D. Stretch forming is a process of cold drawing
Answer : C

34. Multistage compression of air as compared to single stage compression offers the advantage of
A. Power saving per unit weight of air delivered
B. Moisture elimination in the inter-stage cooler
C. Increased volumetric efficiency
D. All (A), (B) & (C)
Answer : D

35. Addition of __________ to steel does not help in improving its machinability.
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous
Answer : B

36. Brazing filler metal used for joining steel plates
A. Melts below the melting points of base metals
B. Melts below 300°C
C. Is copper phosphorous alloy
D. Is copper
Answer : A

37. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x^0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)
A. x^1.5
B. x^0.8
C. x^-1.5
D. x^-0.8
Answer : B

38. Powder metallurgy technique is used in the production of __________ tools.
A. Tungsten carbide
B. High carbon steel
C. High speed steel
D. Drilling
Answer : A

39. A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is
A. Lead
B. Glass
C. Mica
D. Silver
Answer : A

40. Which of the following has the highest value of refractive index?
A. Brine (sea water)
B. Diamond
C. Distilled water
D. Glass
Answer : B

41. Larger length & diameter water pipes are made by
A. Electrical resistance welding
B. Die casting
C. Semi-centrifugal casting
D. Continuous casting
Answer : C

42. Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
A. Sinter
B. Coke
C. Iron ore
D. Limestone
Answer : B

43. Basicity of the slag in Indian blast furnace is in the range of
A. 0.7-1.0
B. 1.1-1.4
C. 1.5 - 1.8
D. 2.0 - 2.5
Answer : B

44. Milk is fat dispersed in water. It is an example of
A. Suspension
B. Emulsion
C. Gel
D. Solution
Answer : B

45. 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

46. Titanium is added to molten aluminium alloys before casting for the purpose of
A. Grain refinement
B. Increasing corrosion resistance
C. Reducing porosity
D. Improving fluidity
Answer : D

47. Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.
A. Burning
B. Intensive oxidation
C. Evaporation
D. None of these
Answer : B

48. 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

49. Batch process is preferred over continuous process, when the
A. Product yields and quality cannot be achieved in continuous process, because of long residence time
B. Sales demand of product is not steady
C. Same equipment cannot be used for several processes of the same nature
D. All (A), (B) & (C)
Answer : B

50. Methyl orange indicator turns
A. Orange yellow in alkaline medium
B. Orange yellow in acidic medium
C. Colourless in acidic medium
D. Colourless in basic medium
Answer : A