Chemical Engineering Basics MCQ Solved Paper for SSC CPO

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

2. As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.
A. Butt
B. Lap
C. Welded
D. None of these
Answer : B

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

4. 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

5. Notched bar test is used for testing the __________ of a material.
A. Impact strength
B. Endurance limit
C. Machinability
D. Corrosion resistance
Answer : A

6. Pick out the wrong statement about coating/electroplating of metals.
A. Phosphate coating is used as an excellent base for paints & enamels
B. Phosphate coating is less corrosion resistant than chromate coating
C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode
D. Calorising is the process of coating steel with chromium
Answer : D

7. Consideration of the creep is the most important in case of the
A. Blades of gas turbine
B. Piston of an I. C. engine
C. Flywheel of steam engine
D. Cycle chain
Answer : A

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

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

10. Which of the following is the correct nature of shear stress distribution along the cross section in a horizontal circular pipe under steady state fluid flow condition?
A.
B.
C.
D.
Answer : C

11. The most abundant metal present in the earth's crust is;
A. Iron
B. Copper
C. Titanium
D. Aluminium
Answer : D

12. 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

13. The following type of bonding is strongly directional in solids.
A. Vander Waal's
B. Ionic
C. Metallic
D. Covalent
Answer : D

14. The most suitable material for die casting is
A. Iron
B. Copper
C. Steel
D. Nickel
Answer : B

15. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)
A. A
B. D
C. 1/A
D. 1/A²
Answer : C

16. Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of
A. Steel
B. Glass wood
C. Copper
D. Fireclay bricks
Answer : B

17. 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

18. Which of the following materials has the maximum shrinkage allowance?
A. Brass
B. Cast iron
C. Lead
D. Aluminium alloy
Answer : C

19. __________ flux is used for the extraction of metal from its self fluxing ores.
A. No
B. Acid
C. Basic
D. Neutral
Answer : A

20. __________ property of steel increases by addition of large amount of silicon in it.
A. Mechanical
B. Machining
C. Magnetic
D. Refractory
Answer : C

21. Pick out the wrong statement.
A. A soft magnetic material should have high permeability and small area of hysteresis loop
B. Poisson's ratio of high melting point metals is more than unity
C. Solders generally melt at less than 185°C
D. Steel produced by B.O.F process is ideally suited for manufacturing flat product
Answer : B

22. Common salt is produced from sea water in India generally by the __________ method.
A. Freeze drying
B. Solar evaporation
C. Electrolytic
D. None of these
Answer : B

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

24. 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

25. Minimum thermal efficiency of a steam boiler may be around __________ percent
A. 25
B. 45
C. 65
D. 20
Answer : D

26. 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

27. Softening of hardened steel is done by its
A. Normalising
B. Tempering
C. Annealing
D. Carburising
Answer : A

28. With increase in annealing temperature, the following defect density decreases.
A. Vacancy
B. Dislocation
C. Grain boundary
D. All of these
Answer : D

29. Upto the critical radius of insulation, added insulation, will
A. Increase the heat loss
B. Decrease heat loss and will have no effect beyond that
C. Decrease heat flux
D. Reduce convection heat loss compared to conduction heat less
Answer : B

30. 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

31. The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
A. 140
B. 180
C. 240
D. 280
Answer : D

32. Out of the following, the __________ pipe has the least corrosion resistance.
A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron
Answer : D

33. Highest cutting speed is achieved by the __________ tool material.
A. High speed steel
B. Carbide
C. Cast alloy
D. Plain carbon steel
Answer : B

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

35. The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.
A. Casting
B. Pattern
C. Draft
D. Distortion
Answer : C

36. For efficient performance of a blast furnace, the extent of reduction of Wustite (F_eO) should be
A. 100% indirect reduction
B. 100% direct reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction
Answer : C

37. The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the
A. Pipe roughness & pipe diameter
B. Fluid velocity
C. Type of flowing fluid
D. Both 'b' & 'c'
Answer : D

38. The most important requirement for aluminium industry is the availability of cheap
A. Ore
B. Electrical power
C. Labour
D. Abundant water
Answer : B

39. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
A. Pitot tube
B. Hot wire anemometer
C. Rotameter
D. Stroboscope
Answer : A

40. 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

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

42. A reduction in thermal resistance during heat transfer does not occur in the
A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emissivity
D. None of these
Answer : C

43. Velocity of a gas in sound is not proportional to (where, T = Absolute temperature of the gas. P = Absolute pressure of the gas. y = Ratio of specific heats (Cp/Cv) ? = specific weight of the gas)
A. ?T
B. 1/?P
C. ?y
D. 1/??
Answer : B

44. Temperature profile along the length of a gasgas counter flow heat exchanger is correctly represented by
A.
B.
C.
D.
Answer : A

45. Gratings is associated with the measurement of
A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness
Answer : A

46. 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

47. 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

48. 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

49. Triple point of water is
A. 0°F
B. 492°R
C. 0°K
D. -273°C
Answer : A

50. Which of the following terminology is used for the temperature at which new grains are formed in a metal?
A. Eutectic temperature
B. Lower critical temperature
C. Recrystallisation temperature
D. Upper critical temperature
Answer : C