Chemical Engineering Basics MCQ Solved Paper for SSC CGL

1. A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in __________ electrons.
A. Lack of free
B. Excess of
C. Decrease in
D. None of these
Answer : B

2. One of the methods of purification of leach liquor is ion exchange, which involves
A. Exchange between two liquid phases
B. Exchange between a gaseous phase and a liquid phase
C. Exchange between a liquid phase and an organic resin phase
D. Exchange between a solid phase and a gas phase
Answer : C

3. Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and
A. Manganese
B. Silicon
C. Nickel
D. Chromium
Answer : A

4. Carbon supply in pack carburising process is in the form of
A. Charcoal
B. Calcium carbide
C. Hydrocarbon oil
D. Graphite
Answer : A

5. 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

6. Fahrenheit and Centigrade scales have the same readings at
A. -55°
B. -40°
C. -33°
D. -58°
Answer : B

7. 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

8. Increase in temperature, in general results in the
A. Decrease in the viscosities of both liquids & gases
B. Increase in the viscosities of both liquids & gases
C. Increase in the viscosity of liquids and decrease in that of gases
D. Decrease in the viscosity of liquids and increase in that of gases
Answer : D

9. Material of construction of foundry crucible is
A. Lead
B. Stainless steel
C. Graphite
D. Cast iron
Answer : C

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

11. A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec² is
A. 8.82
B. 9.81
C. 10.88
D. 0.95
Answer : A

12. Capacity & power requirement for an air compressor working at high altitude compared to sealevel will be
A. More
B. Less
C. Same
D. Either more or less; depends on the climatic conditions
Answer : B

13. 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

14. __________ has the highest melting point out of the following.
A. Tungsten
B. Zirconium
C. Molybdenum
D. Tantalum
Answer : A

15. The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.
A. Elastic
B. Ultimate
C. Yielding
D. Breaking
Answer : C

16. Quartz is a __________ material.
A. Diamagnetic
B. Ferromagnetic
C. Ferroelectric
D. Piezoelectric
Answer : D

17. Use of water as a manometric liquid suffers from the disadvantage of its
A. Low vapour pressure
B. Corrosive nature
C. High vapour pressure
D. High boiling point
Answer : C

18. Which of the following materials has the least scrap value?
A. Aluminium
B. Stainless steel
C. Brass
D. Copper
Answer : B

19. Pick out the wrong statement
A. Processing of thermosetting plastics is ideally done by injection moulding
B. Processing of thermoplastics is ideally done by compression moulding
C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
D. Stretch forming is a process of cold drawing
Answer : C

20. Silicon percentage in silicon steel used for electrical equipments is about
A. 1
B. 4.0
C. 8
D. 14
Answer : B

21. In chemical dehumidification of air
A. Both specific humidity & dry bulb temperature increases
B. Both specific humidity & dry bulb temperature decreases
C. Specific humidity decreases & dry bulb temperature increases
D. Specific humidity increases & dry bulb temperature decreases
Answer : C

22. In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, = velocity gradient).
A.
B.
C.
D.
Answer : D

23. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A. 1/k
B. k
C. k²
D. 1/k²
Answer : B

24. 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

25. Nickel and __________ are the alloying element added in steel to increase its toughness.
A. Molybdenum
B. Chromium
C. Vanadium
D. Silicon
Answer : D

26. 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

27. Glycerine is used as a coolant in cooling of some engines instead of water, because
A. Its higher boiling point (290°C) increases its heat carrying capacity
B. Comparatively less weight of coolant is required
C. Smaller radiator can be used
D. All a, b & c
Answer : D

28. Which of the following is not used as a bearing material?
A. Copper-lead alloys
B. Babbitts
C. Bronzes
D. Cermets
Answer : D

29. Evaporative cooling process employs a combination of cooling and humidification in which the
A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed
Answer : B

30. Calorific value of __________ are almost same.
A. Lignite & anthracite coal
B. Lignite & coal gas
C. Petrol & diesel
D. Coal gas & natural gas
Answer : C

31. Runge-Kutta method is used to solve a/an
A. Ordinary differential equation of nth order
B. Simultaneous non-linear equation
C. Linear differential equation
D. None of these
Answer : B

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

33. Corona discharge is related to the operation of a/an
A. Induction motor
B. Electrostatic precipitator
C. Fast breeder reactor
D. Magneto hydrodynamic generator (MHD)
Answer : B

34. Which one can be directly solidified from gaseous state without entering into liquid state?
A. Helium
B. Oxygen
C. Carbon dioxide
D. None of these
Answer : C

35. 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

36. Materials having resistivity ranging from 1 to 100 ohm. cm is termed as
A. Conductor
B. Insulator
C. Semi-conductor
D. None of these
Answer : C

37. Maraging steels derive their strength from the following mechanism:
A. A fine, highly dislocated and strong martensite
B. Fine dispersions of inter-metallic of Fe, Ni, Ti etc
C. Fine dispersions of alloy carbides in a ferrite matrix
D. Fine dispersions of C nucleated on dislocations in austenite
Answer : A

38. Which of the following has the least value of ultimate tensile strength (UTS)?
A. Medium carbon steel
B. High carbon steel
C. Cast iron
D. Wrought iron
Answer : B

39. 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

40. Normalising does not __________ of a metal.
A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working
Answer : B

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

42. An example of unsteady non uniform flow is the flow of liquid under pressure through a
A. Tapering pipe at constant flow rate
B. Tapering pipe at either decreasing or increasing flow rate
C. Long pipeline of constant diameter
D. None of these
Answer : B

43. Pick out the wrong statement.
A. Complete unity of command exists in a line organisation
B. Line organisation is net suitable for expansion and growth of an industry
C. In line and staff organisation, line executes and staff directs
D. None of these
Answer : D

44. Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type
A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities
Answer : B

45. 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

46. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium
A. Nitrate
B. Sulphate
C. Carbonate
D. Chloride
Answer : A

47. 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

48. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.
A. Silicon
B. Carbon
C. Phosphorous
D. Chromium
Answer : B

49. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
Answer : A

50. Which of the, following is not associated with the functioning of a petrol engine?
A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle
Answer : A