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

1. Factor of safety is the ratio of the __________ stress to the working stress.
A. Tensile
B. Compressive
C. Yield
D. Bearing
Answer : C

2. Identify the false statement
A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
B. Pitting corrosion is usually very localised
C. Hydrogen embrittlement is facilitated by tensile stress
D. Stress corrosion cracking is facilitated by tensile stress
Answer : A

3. Exposure to __________ accelerates the degradation of plastics.
A. Ultraviolet radiation
B. High atmospheric temperature
C. High ambient temperature
D. Damp atmosphere
Answer : A

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

5. Satellites burn off during re-entry to earth's atmosphere, because of the
A. Combustion with air
B. Gravitational pull by earth
C. Friction with earth's atmosphere
D. Loss in weight of the satellite
Answer : C

6. Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.
A. Flanged iron
B. Collar
C. Flexible
D. Expansion
Answer : B

7. Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation
A. Pressure falls below the vapour pressure
B. Pressure becomes very high
C. Temperature becomes low
D. All 'a', 'b' & 'c'
Answer : D

8. The order of a chemical reaction
A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
C. Cannot be zero
D. Can be fractional
Answer : B

9. 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

10. A dummy activity is used in PERT network to describe the
A. Precedence relationship
B. Resource idleness
C. Resource restriction
D. Necessary time delay
Answer : A

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

12. Hot extrusion process is not used for making
A. Cast iron pipe for domestic water supply
B. Aluminium curtain rods
C. Stainless steel tubes used in furnitures
D. Any of these
Answer : A

13. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
A. d^1/2
B. d^-1/2
C. d
D. d^-1
Answer : B

14. Which of the following fastening devices has its both ends threaded?
A. Bolt
B. Stud
C. Set screw
D. Split nut
Answer : B

15. 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

16. 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

17. Resilience of a bolt can be increased by increasing its
A. Length
B. Shank diameter
C. Head diameter
D. None of these
Answer : A

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

19. As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
A. 110
B. 85
C. 60
D. 45
Answer : B

20. Moist climate is the most favourable factor in the site selection far a
A. Steel plant
B. Textile factory
C. Petroleum refinery
D. Coke oven battery
Answer : B

21. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
A. 159
B. 1837
C. 2537
D. 10000
Answer : C

22. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
A. Steel
B.C. Rubber
D. Brass
Answer : A

23. Use of water as a manometric liquid suffers from the disadvantage of its
A. Low vapour pressure
B. Corrosive nature
C. High vapour pressure
D. High boiling point
Answer : C

24. __________ iron is produced by the annealing of white cast iron.
A. Malleable
B. Nodular
C. Ductile
D. Grey
Answer : A

25. The type of pump used for lifting large quantity of sewage is a __________ pump.
A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger
Answer : B

26. 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

27. The main constituent of bones is
A. CaF₂
B. Ca₃(PO₄)₂
C. CaCO₃
D. CaCl₂
Answer : B

28. Which of the following is not an explosive?
A. TNT
B. CMC
C. RDX
D. Lead azide
Answer : B

29. In a good rimming steel
A. Carbon and silicon should be low
B. Silicon should be low but carbon should be high
C. Both silicon & carbon should be high
D. Silicon should be high but carbon should be low
Answer : A

30. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
A. Fatigue strength
B. Creep strength
C. Resilience
D. Endurance limit
Answer : D

31. 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

32. A pycnometer is used for the measurement of
A. Flow rate of molten metal
B. Specific gravity of a liquid
C. Composition of alloys
D. Concentration of a solution
Answer : B

33. Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
Answer : B

34. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
A. Ambient
B. Dry bulb
C. Dew point
D. Wet bulb
Answer : C

35. Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by
A.
B.
C.
D.
Answer : A

36. 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

37. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.
A. Lack of free
B. Excess of
C. Decrease in
D. None of these
Answer : B

38. Water hammer is caused in steam carrying pipelines, because of
A. Partial condensation of steam
B. Vibration of the pipeline
C. High degree of superheat of steam
D. Its exposure to torrential rain
Answer : A

39. Encyclopaedia of Chemical Technology has been
A. Authored by Kirk Othmer
B. Edited by Perry and Chilton
C. Edited by Kirk Othmer
D. Authored by Perry and Chilton
Answer : C

40. 'Ice point' is designated on Fahrenheit temperature scale by
A. 0°
B. 32°
C. 62°
D. 212°
Answer : B

41. The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.
A. 0
B. 100
C. 50
D. None of these
Answer : B

42. The burnout heat flux in the nucleate boiling regime is not a function of the
A. Liquid density
B. Vapour density
C. Temperature difference
D. Heat of evaporation
Answer : B

43. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : C_p of copper is 23 J K^-1mole^-1)
A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 × 10⁶ J
Answer : A

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

45. Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.
A. Steel
B. Lignite
C. Water
D. Lime stone
Answer : C

46. Silicon in steel
A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
D. All 'a', 'b' & 'c'
Answer : D

47. 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

48. __________ rubber is generally used for making 'O' rings used for vacuum sealings.
A. Natural
B. Neoprene
C. Butadiene
D. Nitrile
Answer : B

49. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
A. 0.01 to 0.10
B. 0.2 to 0.4
C. 0.5 to 0.7
D. 0.8 to 1.0
Answer : B

50. Property responsible for the talcum powder to cling to the skin is the
A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension
Answer : B