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

1. A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
A. 0.01
B. 0.1
C. 0.25
D. 0.5
Answer : B

2. With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either (A) or (B), depends on the type of semi-conductor
Answer : A

3. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?
A. Zirconia
B. Alumina
C. Bakelite
D. Tungsten carbide
Answer : D

4. Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
Answer : B

5. The most detrimental impurity in high pressure boiler feed water is
A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity
Answer : C

6. Nickel and __________ are the alloying element added in steel to increase its toughness.
A. Molybdenum
B. Chromium
C. Vanadium
D. Silicon
Answer : D

7. 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

8. Drills are usually made of
A. Cermets
B. High speed steel
C. Alloy steel
D. Tungsten carbide
Answer : B

9. 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

10. 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

11. 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

12. Fog is an example of colloidal system of
A. Solid dispersed in gas
B. Solid dispersed in liquid
C. Liquid dispersed in gas
D. Gas dispersed in liquid
Answer : C

13. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.
A. Silicon
B. Carbon
C. Phosphorous
D. Chromium
Answer : B

14. Which of the, following is not associated with the functioning of a petrol engine?
A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle
Answer : A

15. 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

16. While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the
A. Low impact strength
B. High flexibility
C. Better finish and surface appearance
D. High plastic deformation
Answer : A

17. 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

18. Which of the following phenomenon will exhibit the minimum heat transfer?
A. Boiling
B. Forced convection in air
C. Free convection in air
D. Conduction in air
Answer : D

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

20. Euler number is defined as the ratio of inertia force to __________ force.
A. Pressure
B. Elastic
C. Gravity
D. Viscous
Answer : A

21. 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

22. On being hit with a hammer, __________ will readily fracture.
A. Brass
B. Mild steel
C. Cast iron
D. Lead
Answer : C

23. 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

24. In the X-ray radiography technique, the tube voltage for thicker plates as compared to thin plates, should be
A. Higher, as it gives higher wavelength
B. Lower, as it gives higher wavelength
C. Higher, as it gives shorter wavelength
D. Lower, as it gives shorter wavelength
Answer : C

25. Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
A. Preloaded spring
B. Piezoelectric
C. Bonded strain gauge
D. None of these
Answer : B

26. Materials having __________ lattice structure are usually the most ductile.
A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
D. None of these
Answer : C

27. Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
A. 746
B. 3000
C. 1000
D. 550
Answer : B

28. The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Beryllium
Answer : A

29. The following thermocouple may be used for measuring temperature upto 1873°K.
A. Chromel-alumel
B. Copper-constantan
C. Platinum-platinum rhodium
D. Iron-constantan
Answer : C

30. 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

31. For the irreversible reaction, C_a+ 2C = C_a C₂ , ? H°298 = - 60000 J . mole_-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be
A. 30,000 J
B. 60,000 J
C. 90,000 J
D. 2,40,000 J
Answer : C

32. 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

33. Calorific value of __________ are almost same.
A. Lignite & anthracite coal
B. Lignite & coal gas
C. Petrol & diesel
D. Coal gas & natural gas
Answer : C

34. Air standard Otto cycle is more efficient than the diesel cycle for the same
A. Heat addition & compression ratio
B. Heat addition & pressure
C. Compression ratio & pressure
D. Cylinder dimension & rpm
Answer : A

35. The unit of gc is
A. lb_m/lb_f. ft/sec²
B. lb_f/lb_m. ft/sec²
C. ft/sec²
D. lb_m/lb_f. sec²/ft
Answer : A

36. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.
A. +4000
B. -4000
C. 10000
D. -10000
Answer : A

37. Normalising does not __________ of a metal.
A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working
Answer : B

38. Speisses is a mixture of the following:
A. Arsenides of heavy metals
B. Antimonides of heavy metals
C. Arsenides & antimonides of heavy metals
D. Iron, cobalt and nickel
Answer : A

39. 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

40. Diffusion co-efficient of a metal in a solid solution depends upon its
A. Composition
B. Temperature
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

41. 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

42. What is the range of tempering temperature (°C) for most of the materials?
A. 75-100
B. 200-300
C. 350-450
D. 500-600
Answer : B

43. 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

44. Which of the following is not a characteristic observed in material failure by fatigue fracture?
A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initiation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Answer : B

45. Nickel is a __________ material.
A. Ferromagnetic
B. Semi-conductor
C. Paramagnetic
D. Ferroelectric
Answer : A

46. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10-2 atm, the partial pressure of B is 10-3 atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is
A. 10 atm-1
B. 105 atm-1
C. 10 (dimensionless)
D. 105 (dimensionless)
Answer : B

47. 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

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

49. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?
A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
D. None of these
Answer : D

50. With increase in impurities in metals, their corrosion resistances
A. Increase
B. Decrease
C. Remain same
D. May increase or decrease; depending on the type of metal
Answer : B