1000+ Chemical Engineering Basics Multiple Choice Question Answer [Solved]

1. Work done by a/an __________ process is determined by ?p. dv
A. Adiabatic
B. Quasi-static
C. Isothermal
D. Isentropic
Answer : B

2. The phenomenon occurring during explosion of a hydrogen bomb is
A. Nuclear fission
B. Nuclear fusion
C. A combination of both nuclear fission & fusion
D. None of these
Answer : C

3. Cementite is in the lamellar form in the __________ phase of steel.
A. Martenistic
B. Bainitic
C. Pearlitic
D. Ferritic
Answer : C

4. Latent heat of dry steam at atmospheric pressure is 539 Kcal/kg; which __________ with increase in the pressure of steam.
A. Decreases
B. Increases
C. Remain same
D. May increase or decrease
Answer : A

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

6. Which of the following alloying elements is present in maximum percentage in high speed steel?
A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium
Answer : A

7. Cassiterite is an ore of
A. Tin
B. Lead
C. Molybdenum
D. Chromium
Answer : A

8. 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

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

10. Minimum thermal efficiency of a steam boiler may be around __________ percent
A. 25
B. 45
C. 65
D. 20
Answer : D

11. Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.
A. Cementite
B. Austenite
C. Martensite
D. Pearlite
Answer : B

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

13. Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
A. Anodising
B. Tempering
C. Carburising
D. Annealing
Answer : B

14. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
A. T
B. 1/T
C. T²
D. 1/T²
Answer : A

15. A spring material should have low
A. Elastic limit
B. Deflection value
C. Fatigue resistance
D. None of these
Answer : D

16. The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Answer : A

17. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
A. 130
B. 180
C. 230
D. 250
Answer : C

18. Identify the correct statement.
A. Sphlerite is zinc oxide
B. The first law of the thermodynamics is stated as ?E = ?Q - ?W
C. Lead can be produced in a blast furnace
D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite
Answer : C

19. What is the value of entropy at 273°K?
A. 0
B. 1
C. ?
D. None of these
Answer : A

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

21. Viscoelastic behaviour is observed in __________ materials.
A. Non-crystalline organic polymeric
B. Ceramic
C. All crystalline
D. All amorphous
Answer : A

22. In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?
A. Tin
B. Lead
C. Zinc
D. Glass
Answer : D

23. Heat required to raise the temperature of a body by 1 °C is called its
A. Heat capacity
B. Specific heat capacity
C. Thermal conductivity
D. Water equivalent
Answer : A

24. Electrolytic reduction cell used for conversion of calcined Al₂O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to
A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
D. Both (B) & (C)
Answer : D

25. Adhesives
A. Cant be used in the form of pressure sensitive tapes
B. Cant join two dissimilar metals
C. Cure instantaneously after application on a surface
D. None of these
Answer : D

26. The atmospheric temperature during melting of ice/snow (in the atmosphere)
A. Decreases
B. Increases
C. Remain same
D. May increase or decrease; depends on the altitude where snow melts
Answer : A

27. 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

28. The product of a commercial direct reduction process is
A. Liquid iron
B. Solid iron
C. Sponge iron
D. Iron saturated with carbon
Answer : C

29. Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
A. 1.5
B. 3
C. 5
D. 7
Answer : B

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

31. 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

32. The most abundant metal present in the earth's crust is;
A. Iron
B. Copper
C. Titanium
D. Aluminium
Answer : D

33. __________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.
A. Beryllium
B. Zirconia
C. Alumina
D. Magnesia
Answer : C

34. The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.
A. Refrigerant cooling
B. Evaporator
C. Condenser
D. Throttling
Answer : C

35. M10 index of coke indicates its
A. Compressive strength
B. Hardness
C. Abrasion resistance
D. Impact strength
Answer : C

36. Uniform ramming of sand in green sand moulding process leads to
A. Reduced chance of gas porosity
B. Greater dimensional stability of the casting
C. Uniform flow of molten metal into the mould cavity
D. Less sand expansion type of casting defect
Answer : B

37. 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

38. Out of the following, which will fracture most readity, when hit with a hard hammer?
A. Brass
B. Bronze
C. German silver
D. Cast iron
Answer : D

39. 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

40. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
A. More
B. Less
C. Equal
D. Much more
Answer : C

41. 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

42. Projection welding & stud welding is categorised as the __________ welding.
A. Pressure
B. Thermit
C. Resistance
D. Arc
Answer : C

43. Bad odour in sanitary latrines is reduced by periodically sprinkling
A. Bleaching powder
B. Lime powder
C. Aluminium sulphate
D. None of these
Answer : B

44. The ratio of the shear stress to the principal stress on a principal plane is
A. 0
B. 1
C. 1/2
D. 1/3
Answer : A

45. 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 het treatment
D. Precipitation of complex inter-metallic upon heat treatment
Answer : C

46. The mechanism involved in the removal of metal in drilling operation is by
A. Compression
B. Extrusion
C. Shearing
D. Both 'b' & 'c'
Answer : D

47. Tempering of a material does not improve its
A. Machinability
B. Toughness
C. Internal stress level
D. Softness
Answer : A

48. Hot working of lead is carried out at
A. 75°C
B. 373°K
C. 150°C
D. Room temperature
Answer : B

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

50. Steel balls are manufactured by
A. Sintering
B. Casting
C. Cold heading
D. Spinning
Answer : C