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

1. Desalination of water
A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these
Answer : A

2. 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

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

4. Titanium is produced by __________ of Ti Cl₄.
A. Electrolytic reduction
B. Calcium reduction
C. Magnesium reduction
D. Thermal dissociation
Answer : C

5. In inventory control theory, the economic order quantity (EOQ) is the
A. Lot size corresponding to break even analysis
B. Average level of inventory
C. Optimum lot size
D. None of these
Answer : C

6. 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

7. A psychrometer does not measure the __________ temperature of moist air.
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
Answer : A

8. __________ fluid force is not considered in the Navier-Stokes equation.
A. Turbulent
B. Viscous
C. Gravity
D. Pressure
Answer : A

9. Cold chisel & hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Answer : B

10. 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

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

12. 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

13. __________ is a special constituent of chlorophyll without which photosynthesis is not possible.
A. Calcium
B. Nitrogen
C. Phosphorous
D. Hydrogen
Answer : B

14. Pick out the wrong statement about the machinability of metals. Machinability of a metal
A. Decreases with increase in strain hardening tendencies
B. Decreases with increase in hardness, in general
C. Depend on the composition, microstructure and physical & mechanical properties
D. Decreases with increases in tensile strength & decrease in grain size
Answer : D

15. Quartz is a __________ material.
A. Diamagnetic
B. Ferromagnetic
C. Ferroelectric
D. Piezoelectric
Answer : D

16. Name the safety device used to protect the boiler, when the water level falls below a minimum level.
A. Blow down valve
B. Blow off cock
C. Fusible plug
D. Safety valve
Answer : C

17. 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

18. 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

19. Potable water means the water used for
A. Fire-fighting
B. Cooling
C. Drinking
D. Evaporation to produce steam
Answer : C

20. Neutrons are present in all atoms except that of
A. He
B. C
C. H
D. Ar
Answer : C

21. 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

22. Hot & cold working of material causes its __________ deformation.
A. Visco-elastic
B. Isotropic
C. Elastic
D. Plastic
Answer : D

23. L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Answer : B

24. Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be
A. 5
B. 1.25
C. 2.5
D. 3.75
Answer : A

25. For preparation of porous bearings by powder metallurgy, preferred particle shape is
A. Spherical
B. Nodular
C. Irregular
D. No preferred shape
Answer : A

26. Ceramic compounds as compared to metallic compounds
A. Crystallise faster
B. Resist greater tensile stress at room temperature
C. Have higher melting temperature
D. Are better conductor of electricity at higher temperature
Answer : C

27. 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

28. Which of the following commonly used condenser tube materials has the lowest thermal conductivity?
A. Admiralty brass
B. Stainless steel
C. Aluminium brass
D. Titanium
Answer : B

29. Which of the following metals is not subjected to electrolytic refining/purification?
A. Copper
B. Zinc
C. Tin
D. Aluminium
Answer : C

30. Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
A. Entropy
B. Pressure
C. Volume
D. Heat
Answer : D

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

32. Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails
A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit
Answer : A

33. Cast iron contains __________ percent carbon.
A. 2.5
B. 3.75
C. 4.75
D. 5.25
Answer : A

34. Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
Answer : D

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

36. Fibre glass is a composite material of
A. Glass fibre in a polymer matrix
B. Glass fibre in a metallic matrix
C. Polymer fibre in a glassy matrix
D. Both 'b' & 'c'
Answer : A

37. One ton of refrigeration is not equivalent to the heat removal rate of
A. 200 BTU/minute
B. 50 kcal/minute
C. 50 kJ/sec
D. 3.5 KW
Answer : C

38. What happens, when SO₂ is passed through a solution of H2S in water?
A. Precipitation of sulphur takes place
B. H₂SO₃ is formed
C. Oleum is formed
D. None of these
Answer : A

39. If a solid is compressed adiabatically in its elastic range, its __________ remains constant
A. Internal energy
B. Enthalpy
C. Entropy
D. Temperature
Answer : C

40. Auto collimator is used to check
A. Flatness
B. Angle
C. Rotor balancing
D. Roughness
Answer : B

41. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
A. Hard
B. Soft
C. Silicon carbide
D. Aluminium oxide
Answer : D

42. Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are
A. Cobalt, chromium & tungsten
B. Cobalt, chromium & nickel
C. Molybdenum, tungsten & chromium
D. Cobalt, zirconium & molybdenum
Answer : A

43. Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
A. Sorbite
B. Bainite
C. Martensite
D. Troostite
Answer : B

44. Sand used to stop the green sand from sticking to the pattern is termed as the __________ sand.
A. Parting
B. Synthetic
C. Loam
D. Dry
Answer : A

45. Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non-ferrous cast alloy cutting tool
Answer : D

46. Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
A. Slip
B. Fracture
C. Winning
D. Dislocation
Answer : D

47. Saturated steam at a pressure of 25 kg/cm² is throttled to attain 5 kg/cm². Then the outcoming steam will be
A. Wet
B. Saturated
C. Superheated
D. None of these
Answer : C

48. Hooke's law
A. Applies to elastic deformation
B. Applies beyond limit of proportionality in stress-strain curve
C. States that stress is inversely proportional to strain upto elastic limit
D. None of these
Answer : A

49. 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

50. Fine grained steels have
A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these
Answer : C