Chemical Engineering Basics 1000+ MCQ with answer for SSC GD

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

2. Increase in the entropy of a system represents the
A. Degradation of energy
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature
Answer : A

3. Which of the following alloying elements is present in maximum percentage in high speed steel?
A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium
Answer : A

4. Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?
A. Output & fineness
B. Velocity
C. Both (A) & (B)
D. None of these
Answer : C

5. The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.
A. Hard
B. Soft
C. Silicon carbide
D. Aluminium oxide
Answer : D

6. Temper brittleness of a material can be fairly detected by the __________ test.
A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness
Answer : B

7. 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

8. __________ 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

9. Which of the following is not an ore of copper?
A. Cryolite
B. Azurite
C. Chalcopyrite
D. Malachite
Answer : A

10. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
A. Steel
B. Glass
C. Rubber
D. Brass
Answer : A

11. Ammonia gas can be dried by
A. PCl₅
B. Quick lime
C. CaCl₂
D. Concentrated H₂SO₄
Answer : B

12. Often earing defects are found during deep drawing operation, because the
A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anisotropy due to its texture
Answer : C

13. Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A. Invar
B. Hastelloy
C. Duralumin
D. Monel metal
Answer : A

14. The process of removal of scale formed during hot rolling of steel is termed as
A. Descaling
B. Shot blasting
C. Pickling
D. Skimming
Answer : C

15. In a neutral solution
A. H⁺ ions are absent
B. OH^- ions are absent
C. Both H⁺ and OH^- ions are present in very small but equal concentration
D. None of these
Answer : C

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

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

18. 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

19. Electrometallurgical methods of metal extraction is normally used for those metals
A. Whose oxide/ore is not reduced by carbon
B. Which fall in the category of alkali & alkaline earth metals
C. Which stands higher in the electrochemical series of the metal
D. All (A), (B) & (C)
Answer : D

20. Unit of surface tension in S.I. unit is
A. Watt/m
B. Joule/
C. Newton/
D. Joule/m
Answer : B

21. __________ can replace tungsten in high speed steel.
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
Answer : C

22. Good design of the casing of a centrifugal pump aims at minimising the
A. Cavitation
B. Frictional losses
C. Kinetic energy loss
D. Static head
Answer : C

23. The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?
A. Cyaniding
B. Sherardizing
C. Spheroidising
D. None of these
Answer : A

24. __________ is used for tying the steel columns to concrete foundation.
A. Grouting
B. Eyebolt
C. Anchor bolts
D. Refractory castables
Answer : C

25. 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

26. Pressure exerted by a liquid depends upon its
A. Surface tension
B. Density
C. Viscosity
D. Buoyancy
Answer : B

27. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
Answer : D

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

29. In extrusion of metals, which of the following statement is true?
A. Speed of the extruded material is same as that of ram speed
B. Redundant work is a function of the die angle
C. Relative motion between the billet surface and the container wall is always present
D. Hollow ram is used for indirect extrusion
Answer : D

30. Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
A. Wrought
B. Tool
C. Alloy
D. Plain carbon
Answer : D

31. Biological shield in a nuclear reactor is generally provided to protect against the
A. ?-rays
B. ?-rays
C. Gamma rays & neutrons
D. Electrons
Answer : C

32. 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

33. Rankine cycle comprises of two isothermal and two __________ processes.
A. Isobaric
B. Polytropic
C. Isentropic
D. None of these
Answer : D

34. Difference at any instant between the value of the controlled variable and the set point is called the
A. Deviation
B. Derivative time
C. Error ratio
D. Differential gap
Answer : A

35. Eutectoid composition of carbon steel at room temperature is
A. Cementite
B. Pearlite
C. Martensite
D. Ferrite
Answer : B

36. As the fluid flow rate increases, the float of the Rotameter
A. Rises in the tube
B. Rotates at higher speed
C. Rotates at lower speed
D. Drops down in the tube
Answer : A

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

38. Moist climate is the most favourable factor in the site selection far a
A. Steel plant
B. Textile factory
C. Petroleum refinery
D. Coke oven battery
Answer : B

39. A psychrometer does not measure the __________ temperature of moist air.
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
Answer : A

40. Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
Answer : B

41. 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

42. Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?
A. E = 2G (1 + v)
B. E = G (1 + v)
C. E = G (1 + v)/2
D. E = 2G (1 + 2v)
Answer : A

43. Fire in fuel gas pipelines is extinguished most effectively by
A. Spraying water
B. Blanketting the area with nitrogen atmosphere
C. Fire fighting foam
D. None of these
Answer : B

44. 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

45. The cathode in an electrochemical cell always carries
A. Negative charge
B. Positive charge
C. Zero charge
D. Positive or negative charge depending upon the nature of the cell
Answer : A

46. 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

47. Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.
A. Volume
B. Pressure
C. Heat
D. None of these
Answer : A

48. Tin based white metals are used, where bearings are subjected to
A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear
Answer : A

49. Laser welding is widely employed in the __________ industries.
A. Electronic
B. Structural
C. Process
D. Heavy
Answer : A

50. Which of the following materials has the poorest electrical conductivity?
A. Carbon
B. Aluminium
C. Silver
D. Stainless steel
Answer : A