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

1. __________ is the trade name assigned to a nonferrous cast alloy composed of cobalt, chromium & tungsten.
A. Stellite
B. High speed steel
C. Cermet
D. Alnico
Answer : A

2. Suitability of steel for its use in cable is judged by its strength in
A. Tension
B. Compression
C. Torsion
D. Shear
Answer : A

3. The units of the rate constant for a second order reaction are
A.
B.
C.
D.
Answer : C

4. Runge-Kutta method is used to solve a/an
A. Ordinary differential equation of nth order
B. Simultaneous non-linear equation
C. Linear differential equation
D. None of these
Answer : B

5. 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

6. Which of the following mainly decides the current to be employed is arc welding?
A. Electrode size
B. Plate thickness
C. Voltage across the arc
D. Welded portion length
Answer : A

7. While the recrystallisation temperature for pure metals is 0.3 T_m, the same for alloys is equal to __________ × T_m (where, T_m Melting temperature).
A. 0.25
B. 0.45
C. 0.70
D. 0.95
Answer : C

8. __________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.
A. Collar
B. Flanged
C. Bell and Spigot
D. Expansion
Answer : B

9. 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

10. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
A. 300
B. 800
C. 1400
D. 2000
Answer : C

11. With decrease in the grain size of a material, its creep resistance
A. Increases
B. Decreases
C. Remain constant
D. Either (A) or (B); depends on the material
Answer : C

12. Dislocations are __________ defects.
A. Point
B. Line
C. Volume
D. None of these
Answer : B

13. Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8
A. °C
B. °F
C. °K
D. °R
Answer : B

14. Galvanic corrosion cannot be prevented by
A. Cathodic protection
B. Anodic protection
C. Usage of largest possible anodic area
D. Any one of these
Answer : B

15. The best lubricants for a machine working at high temperature & load is
A. Grease
B. Solid lubricant
C. Animal oils
D. Mineral oils
Answer : B

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

17. 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

18. Milk is fat dispersed in water. It is an example of
A. Suspension
B. Emulsion
C. Gel
D. Solution
Answer : B

19. During sensible cooling of air, its wet bulb temperature
A. Decreases but dew point remains constant
B. Increases but dew point remains constant
C. Increases & the dew point decreases
D. Decreases & the dew point increases
Answer : B

20. Broaching tools are usually made of
A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite
Answer : B

21. 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

22. __________ are normally subjected to sub-zero treatment.
A. Highly stressed parts
B. Gauges or precision parts
C. Cold rolled sheets
D. Non machinable materials
Answer : B

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

24. Maximum consumption of limestone is in the __________ industry.
A. Iron and steel
B. Cement
C. Glass
D. Fertiliser
Answer : D

25. Laser is a device to produce
A. Gamma rays
B. Microwaves
C. A beam of white light
D. A beam of coherent light
Answer : D

26. 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

27. An atom bomb works on the principle of
A. Nuclear fission
B. Nuclear fusion
C. Both the nuclear fission & fusion
D. Ionisation
Answer : A

28. Working of linear variable differential transducer (LVDT) is based on the principle of variable
A. Capacitance
B. Resistance
C. Mutual inductance
D. None of these
Answer : C

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

30. Tesla metre per ampere (T. m/A) is the unit for the measurement of
A. Magnetic susceptibility
B. Magnetic moment
C. Permeability of free space
D. Flux density
Answer : C

31. 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

32. Which of the following represents the correct time-temperature curve when a block of metal is heated above room temperature & then left to cool in the room following Newton's law of cooling in which the rate of temperature drop will go on decreasing with the passage of time.
A.
B.
C.
D.
Answer : C

33. In case of simple harmonic motion, displacement is proportional to the
A. Velocity
B. Acceleration
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : B

34. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
A. Aluminium carbide
B. Tungsten carbide
C. Nickel carbide
D. Iron carbide
Answer : B

35. Pick out the wrong statement.
A. Geothermal energy is a non-conventional source of energy
B. Mass is converted into energy in both nuclear fission & fusion reaction
C. Inhalation of mercury vapour is not harmful for human beings
D. Inhalation of arsenic causes cancer
Answer : C

36. The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be
A. Parabolic
B. Hyperbolic
C. Straight line
D. None of these
Answer : A

37. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the
A. Final control element
B. On-off control
C. Floating control action
D. None of these
Answer : A

38. 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

39. 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

40. In practice, the compression ratio of compression-ignition (CI) engine ranges from
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70
Answer : A

41. Tempering of a material does not improve its
A. Machinability
B. Toughness
C. Internal stress level
D. Softness
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. Which of the following rays has the least wavelength?
A. Ultraviolet rays
B. Infrared rays
C. Cosmic rays
D. X-rays
Answer : C

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

45. Stainless steel is welded using
A. Oxy-acetylene flame
B. Oxy-hydrogen flame
C. Arc welding
D. Inert gas arc welding
Answer : D

46. 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

47. __________ is not a heat treatment process.
A. Cyaniding
B. Parkerizing
C. Austempering
D. Martempering
Answer : B

48. Damage to metal surface by mechanical action is called
A. Pitting
B. Corrosion
C. Erosion
D. None of these
Answer : C

49. 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

50. 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