Chemical Engineering Basics 1000+ MCQ with answer for GMAT

1. A jig is used while __________ a hole.
A. Boring
B. Counter boring
C. Drilling
D. Enlarging
Answer : C

2. Lead is added to 60:40 brass primarily to improve
A. Machinability
B. Corrosion resistance
C. Fluidity
D. Strength
Answer : A

3. For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
A. Linearly
B. Exponentially
C. Logarithmically
D. Inversely
Answer : A

4. 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

5. The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.
A. 0.5
B. 3
C. 10
D. 25
Answer : B

6. 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

7. 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

8. Alloy powder manufactured by the following process have spherical shapes.
A. Electrochemical deposition
B. Gaseous reduction
C. Atomisation
D. Mechanical attrition
Answer : C

9. Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid?
A. p
B. 2 p
C. 0.5 p
D. 0.25 p
Answer : B

10. In the Bayer's process, bauxite is digested under pressure using
A. H₂SO₄
B. NaOH
C. NH₃
D. HCl
Answer : B

11. Colour comparator is used to measure the
A. pH value
B. Electrode potential
C. Colour intensity
D. None of these
Answer : A

12. What is the percentage of chromium in 18-4-1 high speed steel?
A. 1
B. 4
C. 18
D. 23
Answer : C

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

14. Liquor poisoning generally occurs due to the presence of __________ in it.
A. Ethyl alcohol
B. Impurities
C. Methyl alcohol
D. Carbonic acid
Answer : C

15. A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.
A. 370
B. 340
C. 320
D. 300
Answer : A

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

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

18. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?
A. Vapour locking
B. Hot starting
C. Spark plug fouling
D. All 'a', 'b' & 'c'
Answer : C

19. Which of the following is an example of stress corrosion?
A. Season cracking of brass
B. Caustic embrittlement of steel
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

20. The thermodynamic law, = constant, is not followed by the
A. Free expansion of an ideal gas
B. Adiabatic expansion of steam in turbine
C. Adiabatic compression of air
D. Ideal compression of air
Answer : A

21. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.
A. 5-10
B. 1000-1500
C. 120-500
D. 1500-3000
Answer : C

22. The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.
A. Tension
B. Shear
C. Compression
D. Bending & tension
Answer : A

23. An ideal material for making cooking vessels should have
A. High heat capacity
B. Low heat capacity
C. High thermal conductivity
D. Both (B) and (C)
Answer : D

24. Young's modulus of a material is the measure of its
A. Stiffness
B. Malleability
C. Creep resistance
D. Tensile strength
Answer : A

25. Unit of viscosity in CGS system is
A.
B.
C.
D.
Answer : A

26. 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

27. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.
A. Flow output
B. Head developed
C. Overall efficiency
D. Weight
Answer : A

28. Friction factor for fluid flow in pipe does not depend upon the
A. Pipe length
B. Pipe roughness
C. Fluid density & viscosity
D. Mass flow rate of fluid
Answer : A

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

30. At absolute zero temperature, for any reaction involving condensed phases
A. ? G° = 0 , ? H° = 0
B. ? H° = 0 , ? S° = 0
C. ? S° = 0 , ? E° = 0
D. ? S° = 0 , ? Cp° = 0
Answer : C

31. The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their
A. Equivalent weight
B. (Equivalent weight)²
C. Molecular weight
D. (Molecular weight)²
Answer : A

32. Pearlite comprises of
A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
D. 87% ferrite & 13% C
Answer : B

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

34. Fibre reinforced plastic (FRP) are
A. Made of glass fibre and thermoplastic resins
B. Anisotropic
C. Made of thermosetting resin and glass fibre
D. Both 'b' & 'c'
Answer : D

35. 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

36. 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

37. Cupola produces __________ iron.
A. Pig
B. Cast
C. Wrought
D. Carbon free
Answer : B

38. The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.
A. Wetness
B. Mass flow rate
C. Both 'a' & 'b'
D. Neither 'a' nor 'b'
Answer : C

39. Chromium molybdenum steel cannot be welded using __________ welding.
A. Thermit
B. Electrical resistance
C. Oxy-acetylene
D. Any of these
Answer : B

40. __________ of test specimens is not involved in any hardness testing method.
A. Fracture
B. Indentation
C. Wear
D. Scratch
Answer : A

41. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
A. Bomb
B. Throttling
C. Junker's
D. Boy's
Answer : B

42. Reduction in the grain size reduces the __________ of the material.
A. Fatigue resistance
B. Tensile strength
C. Creep resistance
D. All (A), (B) & (C)
Answer : D

43. In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (?), (ii) molecular diffusivity (?) and thermal diffusivity (?). The units of these quantities are.
A. ? , ? and ? all have units of m/s
B. ? , ? and ? all have units of m2/s
C. ? and ? have units of m2/s, while ? has unit of m/s
D. ? and ? have units of m/s, while ? has unit of m2/s
Answer : C

44. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass
Answer : A

45. The leaching solvent used in Baeyer's process for the purification of bauxite is
A. Ammonium hydroxide
B. Sodium carbonate
C. Sodium hydroxide
D. Ammonium carbonate
Answer : B

46. 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

47. Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?
A. Galvanising
B. Tinning
C. Sherardizing
D. None of these
Answer : C

48. 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

49. Heat transfer by __________ is almost absent in case of fluidised bed drying operation.
A. Radiation
B. Conduction
C. Convection
D. Both (B) & (C)
Answer : A

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