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1000+ Chemical Engineering Basics MCQ for LIC ADO [Solved]

Thursday 9th of March 2023

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1. With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either (A) or (B), depends on the type of semi-conductor
Answer : A
2. Which of the following metals reacts violently with water?
A. Mercury
B. Sodium
C. Calcium
D. Magnesium
Answer : B
3. Cold chisels hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Answer : B
4. Cementite is in the lamellar form in the __________ phase of steel.
A. Martenistic
B. Bainitic
C. Pearlitic
D. Ferritic
Answer : C
5. Force between the molecules of the same substance is called __________ force.
A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls
Answer : B
6. The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Beryllium
Answer : A
7. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?
A. 9,100
B. 13,000
C. 7,000
D. 2,550
Answer : A
8. The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
Answer : C
9. 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
10. The swift cup test evaluates the following property of a sheet metal.
A. Stretchability
B. Drawability
C. Bendability
D. None of these
Answer : B
11. 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
12. Hydrogen can be
A. Used in I.C. engines as fuel
B. Liquefied & stored under cryogenic conditions
C. Produced by electrolysis of water
D. All (A), (B) & (C)
Answer : D
13. Maximum hardenability of steel depends upon its
A. Chemical composition
B. Carbon content
C. Grain size
D. Alloying elements content
Answer : D
14. In the diving apparatus, helium is used along with oxygen, because it is
A. Easily available
B. Not soluble in blood at high pressure
C. Lighter than nitrogen
D. Completely miscible with oxygen
Answer : B
15. 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
16. 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
17. Flue gases pass through the following boiler accessories in a high pressure natural circulation boiler.
A. Induced draft fan
B. Economiser
C. Air preheater
D. Steam superheater Which of the following gives the correct sequence of flow of the flue gases through the above mentioned boiler accessories?

A. A, C, B, D
B. D, B, C, A
C. D, C, B, A
D. D, A, B, C
Answer : B
18. The 'laughing gas' is
A. Nitrous oxide
B. Nitric oxide
C. Nitrogen trioxide
D. Nitrogen pentoxide
Answer : A
19. Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
Answer : B
20. Coating provided on the electrodes used in the arc welding is not expected to
A. Add alloying elements
B. Prevent electrode from contamination
C. Stabilise the arc
D. Provide protective atmosphere to weld
Answer : B
21. The passage between the nozzle and the __________ is called 'sprue' in case of injecion moulding.
A. Runner
B. Cylinder
C. Mold
D. None of these
Answer : A
22. Pick out the wrong statement.
A. The X-rays cannot be deflected by electric field unlike cathode rays
B. The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays
C. The quality of X-rays can be controlled by varying the anode-cathode voltage
D. Crystal structure of a material can be studied by an electron microscope
Answer : C
23. Drills are usually made of
A. Cermets
B. High speed steel
C. Alloy steel
D. Tungsten carbide
Answer : B
24. 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
25. Cascade control is
A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller
B. Used when changes in process conditions cause serious upsets in the controlled variable
C. Useful to control flow from temperature
D. All 'a', 'b' & 'c'
Answer : D
26. Oxide layer formed on the non-ferrous metal surface after its annealing is
A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface
Answer : A
27. Thermal conductivity of a material does not depend upon its
A. Mass
B. Volume
C. Surface area
D. All 'a', 'b' & 'c'
Answer : D
28. Function of fusible plug in a boiler is to
A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All (A), (B) & (C)
Answer : B
29. Silicon percentage in acid resistant cast iron is about
A. 4
B. 8
C. 14
D. 20
Answer : A
30. The activity co-efficient of the solute in a dilute solution
A. Decreases with the increase of concentration of the solute
B. Increases with the increase of concentration of the solute
C. Remains constant
D. Is unity at infinite dilution
Answer : C
31. In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will
A. Decrease gradually
B. Increase gradually
C. Increase rapidly
D. Remain constant
Answer : B
32. The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by
A. Decreasing the surface area of the electrodes
B. Increasing the concentration of zinc sulphate solution
C. Increasing the surface area of the electrodes
D. Increasing the concentration of copper sulphate solution
Answer : D
33. Carbon is present in the form of __________ in grey cast iron.
A. Spheroids
B. Nodular aggregates of graphite
C. Flakes
D. Cementite
Answer : C
34. An oxidation process is accompanied with decrease in the
A. Number of electrons
B. Oxidation number
C. Number of ions
D. All (A), (B) & (C)
Answer : A
35. A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is
A. -0.8
B. 0.8
C. +0.08
D. -0.24
Answer : D
36. Desalination of water
A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these
Answer : A
37. Normalising of an object does not
A. Refine coarse grain structure obtained during hot working
B. Improve ductility
C. Improve yield strength
D. Improve mechanical properties
Answer : B
38. The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called
A. Resilience
B. Toughness
C. Ductility
D. Impact strength
Answer : A
39. Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)
A. H
B. H/2
C. H/4
D. H/6
Answer : D
40. The two elements required to form substitutional solid solution should not have
A. Same crystalline structure
B. Same valency
C. Widely differing electronegativity
D. Same atomic sizes
Answer : C
41. Heat release during phase change is observed in case of a/an
A. Boiler
B. Condenser
C. Evaporator
D. All (A), (B) & (C)
Answer : B
42. 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
43. There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.
A. One
B. Two
C. Three
D. None of these
Answer : B
44. The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.
A. Flow output
B. Head developed
C. Overall efficiency
D. Weight
Answer : A
45. Spheroidising of a material is a/an __________ process.
A. Normalising
B. Annealing
C. Tempering
D. Hardening
Answer : B
46. Transformer cores are normally made from
A. Soft ferrites
B. High purity iron
C. Grain oriented Fe-Si alloy
D. Al-Ni-Co alloy
Answer : C
47. 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
48. Property responsible for the talcum powder to cling to the skin is the
A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension
Answer : B
49. 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
50. 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

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