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
- (B) ∞
- (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)
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