Chemical Engineering Basics 1000+ MCQ with answer for GRE

1. Closeness of packing is maximum in case of __________ crystal lattice.
A. Face centred
B. Simple cubic
C. Body centred
D. None of these
Answer : A

2. Metalloids
A. Are good conductor of heat & electricity
B. Act as electron donors with metals & as electron acceptor with non-metals
C. Are not necessarily solids at room temperature
D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron
Answer : D

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. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as
A. Gr^0.25, Gr
B. Gr^0.25, Gr^0.33
C. Gr, Gr^0.25
D. Gr^0.33, Gr^0.25
Answer : A

5. 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

6. Which of the following has the highest value of refractive index?
A. Brine (sea water)
B. Diamond
C. Distilled water
D. Glass
Answer : B

7. __________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.
A. Lancing
B. Shot peening
C. Slugging
D. Spinning
Answer : B

8. Energy of the sun arises mainly from __________ reactions.
A. Fusion
B. Fission
C. Combustion
D. None of these
Answer : A

9. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
A. Cold
B. Work
C. Age
D. Induction
Answer : B

10. __________ of grey cast iron produces white cast iron.
A. Tempering
B. Rapid heating
C. Rapid cooling
D. Slow cooling
Answer : B

11. Nusselt number/Biot number varies
A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid
Answer : A

12. If the head is doubled in & centrifugal pump, the power required will increase in the ratio of
A. 2³
B. 2^3/2
C. 2^5/2
D. 2^1/3
Answer : B

13. Which of the following properties of a solid is not dependent on crystal imperfection?
A. Ductility
B. Semi-conductivity
C. Melting point
D. Yield stress
Answer : C

14. Thermal efficiency of an internal combustion engine is around __________ percent.
A. 8
B. 35
C. 65
D. 80
Answer : B

15. In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
B. Maintaining vacuum on tube side is more difficult than that on the shell side
C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
D. Condenser can act as a storage unit for condensed steam
Answer : C

16. 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

17. Annealing of white cast iron produces __________ iron.
A. Grey
B. Nodular
C. Malleable
D. Spheroidal
Answer : C

18. In chemical dehumidification process
A. Wet bulb temperature increases
B. Dry bulb temperature remains constant
C. Dew point temperature increases
D. Dry bulb temperature increases
Answer : B

19. 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

20. A form of stress corrosion failure termed as 'season cracking' is generally observed in
A. Thermosetting polymers
B. High carbon steels
C. Brasses
D. Borosilicate glasses
Answer : C

21. Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.
A. Grey
B. Black
C. Opaque
D. White
Answer : A

22. Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.
A. 1
B. 10
C. 30
D. 50
Answer : B

23. __________ 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

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

25. A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to
A. ?(Particle diameter)
B. Particle diameter
C. (Particle diameter)²
D. (Particle diameter)³
Answer : B

26. If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
A. Critical
B. Breeder
C. Fertile
D. Heterogeneous
Answer : B

27. __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.
A. Borosilicate
B. High silica
C. Supermax
D. Lead
Answer : C

28. 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

29. The specific gravity of coal depends mainly on its __________ content.
A. Carbon
B. Volatile matter
C. Ash
D. Moisture
Answer : D

30. 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

31. 'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and
A. Petrol
B. LPG
C. Light hydrocarbon gases (e.g. butane or propane)
D. None of these
Answer : A

32. Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non-ferrous cast alloy cutting tool
Answer : D

33. Magnesium is present in
A. Haemoglobin
B. Chlorophyll
C. Hypo solution
D. None of these
Answer : B

34. 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

35. 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

36. 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

37. Which of the following contributes maximum as main source of sulphur in the blast furnace charge?
A. Sinter
B. Coke
C. Iron ore
D. Limestone
Answer : B

38. Maximum hardenability of steel depends upon its
A. Chemical composition
B. Carbon content
C. Grain size
D. Alloying elements content
Answer : D

39. 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

40. 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

41. Pick out the wrong statement.
A. Seam welding, projection welding & spot welding are the classification of electrical resistance welding
B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes
D. Mild steel sheet cannot be spot welded
Answer : D

42. 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

43. 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

44. Atomic __________ of an element is a whole number.
A. Weight
B. Number
C. Volume
D. Radius
Answer : B

45. An abrupt and sudden fall in the reading of barometer is an indication of the
A. Storm
B. Rain
C. Clear weather
D. Cold wave
Answer : A

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

47. L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Answer : B

48. Dies for wire drawing are generally made of
A. Mild steel
B. Stainless steel
C. Carbides
D. High carbon steel
Answer : A

49. The main reducing agent in iron blast furnace is
A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air
Answer : B

50. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution
A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₂ is very slightly acidic
D. Both (B) & (C)
Answer : D