1000+ Chemical Engineering Basics MCQ for XAT [Solved]

1. Friction factor for fluid flow in pipe does not depend upon the
A. Pipe length
B. Pipe roughness
C. Fluid density & viscosity
D. Mass flow rate of fluid
Answer : A

2. Spark plug is provided in a/an
A. Engine having carburettor
B. Diesel engine
C. Compression ignition engine
D. Both (B) & (C)
Answer : A

3. Which of the following if present in iron ore, enhances its value?
A. Alumina
B. Alkali oxide
C. Lime & Magnesia
D. None of these
Answer : C

4. Fine grained steels have
A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these
Answer : C

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

6. Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
D. All (A), (B) & (C)
Answer : D

7. The ratio of thermal & electrical conductivity is same for all the metals at the same temperature; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)
A. T
B. 1/T
C. T²
D. 1/T²
Answer : A

8. The majority charge carriers in p-type silicon are
A. Free electrons
B. Ions
C. Conduction electrons
D. Holes
Answer : D

9. Lead is added to 60:40 brass primarily to improve
A. Machinability
B. Corrosion resistance
C. Fluidity
D. Strength
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. 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

12. Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
A. 300
B. 800
C. 1400
D. 2000
Answer : C

13. Current employed in resistance welding ranges from __________ kVA/.
A. 1.2 to 2.5
B. 4.5 to 6.2
C. 7.5 to 8.5
D. 10.5 to 15.5
Answer : B

14. 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

15. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
A. Fatigue strength
B. Creep strength
C. Resilience
D. Endurance limit
Answer : D

16. The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.
A. Ambient
B. Dry bulb
C. Dew point
D. Wet bulb
Answer : C

17. Consumable electrodes are used in the __________ welding.
A. Gas
B. Arc
C. Thermit
D. Resistance
Answer : B

18. What is the value of entropy at 273°K?
A. 0
B. 1
C. ?
D. None of these
Answer : A

19. 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

20. The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.
A. Evaporative capacity
B. Evaporation efficiency
C. Thermal efficiency
D. Steam load
Answer : A

21. 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

22. Plastics as a material of construction suffer from the drawback of low
A. Machinability
B. Density
C. Strength
D. Plastic deformation
Answer : C

23. Pick out the correct statement.
A. Hot worked materials are subjected to annealing to remove internal stresses
B. Annealing of steel hardens it slightly
C. Normalising of a material induces stresses
D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness
Answer : D

24. 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

25. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses
Answer : B

26. Fibre reinforced plastic (FRP) are
A. Made of glass fibre and thermoplastic resins
B. Anisotropic
C. Made of thermosetting resin and glass fibre
D. Both 'b' & 'c'
Answer : D

27. The phenomenon occurring during explosion of a hydrogen bomb is
A. Nuclear fission
B. Nuclear fusion
C. A combination of both nuclear fission & fusion
D. None of these
Answer : C

28. Steel & cast iron pipes are produced by __________ casting.
A. Slush
B. Die
C. Investment
D. True centrifugal
Answer : D

29. Metal shots used in shot blasting are made of
A. Stellite
B. Steel
C. Bronze
D. Lead
Answer : B

30. __________ is not a case hardening process.
A. Carburising
B. Nitriding
C. Cyaniding
D. Annealing
Answer : A

31. Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to
A. (r₂ - r₁)/r₁. r₂
B. r₁. r₂/(r₂ - r₁)
C. (r₂ + r₁)/r₁. r₂
D. r₁. r₂/(r₂ + r₁)
Answer : B

32. 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

33. 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

34. The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T₁ and T₂ is given by
A. T₁/(T₁-T₂)
B. T₂/(T₁-T₂)
C. T₁/T₂
D. T₂/T₁
Answer : B

35. In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is
A. More
B. Less
C. Equal
D. Much more
Answer : C

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

37. In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).
A. Mechanical
B. Overall
C. Volumetric
D. Impeller
Answer : A

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

39. To improve the machinability of steel, it is generally subjected to
A. Spheroidising
B. Tempering
C. Normalising
D. Annealing
Answer : A

40. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
A. 0.01 to 0.10
B. 0.2 to 0.4
C. 0.5 to 0.7
D. 0.8 to 1.0
Answer : B

41. Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.
A. Hot rolled mild
B. Cold rolled mild
C. Forged
D. Machinable stainless
Answer : B

42. __________ 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

43. 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 & rm
Answer : A

44. Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.
A. Diminishing balance
B. Sinking fund
C. Multiple straight line
D. Sum of the years digit
Answer : A

45. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
A. Frequency
B. Amplitude
C. Damping
D. None of these
Answer : A

46. Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?
A. Vapour locking
B. Hot starting
C. Spark plug fouling
D. All 'a', 'b' & 'c'
Answer : C

47. The pressure outside a bubble/droplet of liquid is __________ the internal pressure.
A. Greater than
B. Less than
C. Equal to
D. Unpredictable; depends on the bubble size
Answer : B

48. Shampoos are commercially not available in the form of
A. Powder
B. Gaseous mixture
C. Solution
D. Emulsion
Answer : B

49. Pick out the wrong statement.
A. Weldability of high carbon steel is poorer compared to low carbon steel
B. Invar is a magnetic alloy
C. Magnetic permeability of the diamagnetic material is less than one
D. Martenistic transformation never goes to completion (i.e., 100%) at room temperature
Answer : B

50. 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