ESIC - Chemical Engineering Basics 1000+ MCQ [Solved] PDF Download

1. At the point of boundary layer separation in fluid flow, the
A. Shear stress is maximum
B. Velocity gradient is flat
C. Density variation is maximum
D. Shear stress is zero
Answer : A

2. 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

3. About __________ ton of coke is required in a cupola to produce one ton of casting.
A. 0.03
B. 0.3
C. 0.8
D. 1.5
Answer : B

4. Constituents of stellite are
A. Zinc, copper & nickel
B. Cobalt, chromium & tungsten
C. Zinc, aluminium & nickel
D. Nickel, cobalt & vanadium
Answer : B

5. Hydrogen can be
A. Used in I.C. engines as fuel
B. Liquefied & stored under cryogenic conditions
C. Produced by electrolysis of water
D. All (A), (B) & (C)
Answer : D

6. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
A. 2
B. 3
C. 0.8
D. 6
Answer : B

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

8. Wood is a/an __________ material.
A. Amorphous
B. Cellular
C. Homogeneous
D. Granular
Answer : B

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

10. 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

11. Which of the following metals is the most prone to work hardening?
A. Brass
B. Aluminium
C. Copper
D. Lead
Answer : A

12. 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

13. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
Answer : D

14. The hardenability of steel decreases with
A. Decrease in dislocation density
B. Increase in solutionising temperature
C. Increase in strength
D. Decrease in grain size
Answer : D

15. Lead pencil contains
A. Graphite
B. Lead sulphide
C. Lead
D. Both (B) & (C)
Answer : A

16. Dephosphorization of molten pig iron is favoured by
A. Oxidising and basic slag
B. Reducing and basic slag
C. High activity co-efficient of phosphorous in metal
D. Oxidising and neutral slag
Answer : B

17. The rolling process cannot be used to produce
A. Plates
B. Rods
C. Tubes
D. Wires
Answer : C

18. Wrought iron does not have
A. Uniform strength in all directions
B. Ability to hold protective coating
C. High ductility & corrosion resistance
D. Easily weldable characteristics
Answer : A

19. Consideration of the creep is the most important in case of the
A. Blades of gas turbine
B. Piston of an I. C. engine
C. Flywheel of steam engine
D. Cycle chain
Answer : A

20. The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
A. Red
B. Extended
C. Super
D. Extreme
Answer : C

21. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
A. Resilience
B. Toughness
C. Ductility
D. Impact strength
Answer : A

22. Which of the following metals reacts violently with water?
A. Mercury
B. Sodium
C. Calcium
D. Magnesium
Answer : B

23. 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

24. 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

25. Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode
A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
D. All (A), (B) & (C)
Answer : D

26. Specific __________ is a dimensionless quantity.
A. Heat
B. Humidity
C. Weight
D. None of these
Answer : D

27. 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

28. The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the
A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection
Answer : D

29. 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

30. Joining of thin foils is preferred to be done by
A. Gamma rays
B. X-rays
C. Microwaves
D. Gas welding
Answer : C

31. In chemical dehumidification of air
A. Both specific humidity & dry bulb temperature increases
B. Both specific humidity & dry bulb temperature decreases
C. Specific humidity decreases & dry bulb temperature increases
D. Specific humidity increases & dry bulb temperature decreases
Answer : C

32. The refrigerant freon-12 is chemically
A. CCl₂F₂
B. CCl₃F
C. CClF₃
D. CCl₄F
Answer : A

33. __________ of air does not increase with increase in temperature.
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity
Answer : A

34. The trace metal present in insulin is
A. Cu
B. Zn
C. Fe
D. Ni
Answer : B

35. Pick out the correct combination about the role of various additives used in polymers.
A. Plasticiser: increases the polymer strength
B. Heat stabiliser: increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers
Answer : C

36. 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

37. Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
A. 723
B. 959
C. 1147
D. 1493
Answer : A

38. The material used for coating the welding electrode is termed as the
A. Flux
B. Slag
C. Protective layer
D. Binder
Answer : B

39. Steels with high carbon equivalent have poor Weldability, because in these steels during welding
A. Carbon and other alloying elements get oxidised from the weld pool
B. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Answer : C

40. Material of construction of the electrode used in the electric resistance welding is
A. Stainless steel
B. Graphite
C. Copper
D. Steel
Answer : C

41. __________ is used as a material of construction for the blade of power saw.
A. Wrought iron
B. Stainless steel
C. Mild steel
D. High speed steel
Answer : D

42. Which of the following if present in iron ore, enhances its value?
A. Alumina
B. Alkali oxide
C. Lime & Magnesia
D. None of these
Answer : C

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

44. Wrought iron is never shaped by
A. Casting
B. Cold working
C. Forging
D. Welding
Answer : A

45. Oxide layer formed on the non-ferrous metal surface after its annealing is
A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface
Answer : A

46. What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.
A. 2
B. 8
C. 10
D. 40
Answer : A

47. __________ is not used as the control rod material in a nuclear reactor.
A. Cobalt
B. Hafnium
C. Cadmium
D. Boron
Answer : A

48. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
A. Casting
B. Pattern
C. Draft
D. Distortion
Answer : C

49. Which of the following can be manufactured using powder metallurgy techniques?
A. Brake linings
B. Bearings
C. Carbide tool tips
D. All 'a', 'b' and 'c'
Answer : D

50. 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