Basic in Chemical Engineering - Set 55 - ObjectiveBooks

Basic in Chemical Engineering - Set 55

Practice Test: Question Set - 55

1. Electrometallurgy is not involved in the extraction of __________ from its ore.
    (A) Aluminium
    (B) Tin
    (C) Lead
    (D) Both (b) & (c)

2. Pick out the wrong statement.
    (A) Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region
    (B) Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
    (C) Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections
    (D) Brittle materials are generally tested in tension

3. In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be
    (A) Conduction
    (B) Radiation
    (C) Natural convection
    (D) Forced convection

4. 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

5. 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

6. Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
    (A) Scratch
    (B) Indentation
    (C) Dynamic
    (D) Rebound

7. Nusselt number/Biot number varies
    (A) Inversely with thermal conductivity
    (B) Directly with heat transfer co-efficient
    (C) Directly with thermal conductivity
    (D) Inversely with the dimension of the solid

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

9. Hooke's law
    (A) Applies to elastic deformation
    (B) Applies beyond limit of proportionality in stress-strain curve
    (C) States that stress is inversely proportional to strain upto elastic limit
    (D) None of these

10. Which of the following fastening devices has its both ends threaded?
    (A) Bolt
    (B) Stud
    (C) Set screw
    (D) Split nut

11. 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

12. Dryness fraction of dry steam is
    (A) 0
    (C) 1
    (D) 0.5

13. 'GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and
    (A) Petrol
    (B) LPG
    (C) Light hydrocarbon gases (e.g. butane or propane)
    (D) None of these

14. Pick out the wrong statement.
    (A) Geothermal energy is a non-conventional source of energy
    (B) Mass is converted into energy in both nuclear fission & fusion reaction
    (C) Inhalation of mercury vapor is not harmful for human beings
    (D) Inhalation of arsenic causes cancer

15. Batch process is preferred over continuous process, when the
    (A) Product yields and quality cannot be achieved in continuous process, because of long residence time
    (B) Sales demand of product is not steady
    (C) Same equipment cannot be used for several processes of the same nature
    (D) All (a), (b) & (c)

Show and hide multiple DIV using JavaScript View All Answers

 Next Tests: