UPSC CDS - Chemical Engineering Basics 1000+ MCQ [Solved] PDF Download

1. Natural water contains approximately __________ percent of heavy water.
A. 0.015
B. 0.71
C. 1.2
D. 3.5
Answer : A

2. The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is
A. More
B. Equal
C. Less
D. Double
Answer : A

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

4. The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.
A. 100
B. 200
C. 1000
D. 2000
Answer : B

5. 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

6. 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

7. The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
A. 768
B. 1127
C. 1359
D. 1480
Answer : B

8. 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

9. Stresses encountered in the metal forming processes are less than the __________ of the material.
A. Fracture strength
B. Yield strength
C. Elastic limit
D. Limit of proportionality
Answer : A

10. Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)
A. A
B. l
C. A2
D. Both 'a' & 'b'
Answer : D

11. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
A. Forging
B. Cold rolling
C. Hot rolling
D. Casting
Answer : B

12. Coarse grained steels have
A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness
Answer : B

13. The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.
A. 768
B. 908
C. 1400
D. 1539
Answer : A

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

15. The lightest non-inflammable gas is
A. H2
B. He
C. Ar
D. O2
Answer : B

16. Which of the following metals is not subjected to electrolytic refining/purification?
A. Copper
B. Zinc
C. Tin
D. Aluminium
Answer : C

17. A spring material should have low
A. Elastic limit
B. Deflection value
C. Fatigue resistance
D. None of these
Answer : D

18. Silicon percentage in acid resistant cast iron is about
A. 4
B. 8
C. 14
D. 20
Answer : A

19. Percentage of argon (by volume) in dry atmospheric air is about
A. 0.09
B. 0.3
C. 0.57
D. 0.94
Answer : D

20. Super conduction in metals is observed at a temperature of __________ °K.
A. <100
B. >100
C. About 273
D. About 373
Answer : B

21. 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

22. Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
A. 0.8
B. 7.8
C. 200
D. 10000
Answer : A

23. Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot
A. Piercing
B. Spinning
C. Drawing
D. Extrusion
Answer : B

24. 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

25. A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.
A. 150
B. 200
C. 300
D. 400
Answer : B

26. A material is capable of resisting softening at high temperature, because of its property termed as
A. Hot temper
B. Hot hardness
C. Fatigue
D. Creep
Answer : B

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

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

29. The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/cm².
A. 273.15
B. 225.65
C. 100.03
D. 373.15
Answer : B

30. Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.
A. Manganese
B. Phosphorous
C. Magnesium
D. Chromium
Answer : C

31. Screws are specified by their __________ diameters.
A. Minor
B. Major
C. Pitch
D. None of these
Answer : B

32. Ganister contains maximum percentage of
A. FeO
B. SiO2
C. MgO
D. MnO2
Answer : B

33. __________ of hard alloy and tool steel is done to make it easily machinable.
A. Case carburising
B. Tempering
C. Normalising
D. Annealing
Answer : B

34. The surface tension of a liquid, at critical temperature is
A. Indeterminate
B. Zero
C. Infinity
D. Same as that at any other temperature
Answer : B

35. A dense structure of grinding wheel is not used for the
A. Ductile material
B. Hard materials
C. Brittle materials
D. Finishing cuts
Answer : A

36. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
A. Percentage elongation
B. Brinell hardness
C. Tensile strength
D. All 'a', 'b' & 'c'
Answer : A

37. __________ 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

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

39. High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.
A. 5 to 10
B. 15 to 25
C. 45 to 50
D. 75 to 80
Answer : C

40. Density in the solid state is slightly less than that in its liquid state, in case of
A. Carbon dioxide
B. Water
C. Mercury
D. None of these
Answer : B

41. Steel produced from phosphatic iron is __________ in nature.
A. Malleable
B. Ductile
C. Brittle
D. Tough
Answer : C

42. 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

43. Case hardening is not done by
A. Nitriding
B. Hot dipping
C. Electroplating
D. Both b & c
Answer : D

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

45. 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

46. 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 smalle
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

47. Removal of non-condensable from steam or other vapour is termed as the __________ process.
A. Condensation
B. Deaeration
C. Scavenging
D. Exhaust
Answer : B

48. 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

49. 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

50. Pick out the wrong statement about nucleate boiling.
A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
B. Surface temperature is greater than the saturation temperature of the liquid
C. Heat transfer from the surface of the liquid is less than that in film boiling
D. The temperature is less than that of film boiling
Answer : D