Practice Test: Question Set - 10
1. Which of the following materials has the maximum shrinkage allowance?
- (A) Brass
- (B) Cast iron
- (C) Lead
- (D) Aluminium alloy
2. In multipass welds, shot peening is done after each pass to
- (A) Close the surface porosity
- (B) Break the continuity of columnar grains
- (C) Flatten the weldment
- (D) Introduce texture in the weld
3. A reduction in thermal resistance during heat transfer does not occur in the
- (A) Convection heat transfer by stirring the fluid and cleaning the heating
surface
- (B) Conduction heat transfer by reduction in the
material thickness and increase in the thermal conductivity
- (C) Radiation heat transfer by increasing the temperature and reducing
the emissivity
- (D) None of these
4. Pick out the correct combination about the role of various additives used in polymers.
- (A) Plasticiser: increases the polymer strength
- (B) Heat stabilizer: increases the maximum service temperature
- (C) Fillers: Does not affect the property of polymer but increases its
weight
- (D) Lubricants: increases the flexibility of polymers
5. Color comparator is used to measure the
- (A) pH value
- (B) Electrode potential
- (C) Color intensity
- (D) None of these
6. Which of the following is not used as a bearing material?
- (A) Copper-lead alloys
- (B) Babbitts
- (C) Bronzes
- (D) Cermets
7. Tumbling is the process of improving the __________ of the materials/parts.
- (A) Surface finish
- (B) Fatigue limit
- (C) Creep limit
- (D) Surface cleanliness
8. The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability?
- (A) Lead
- (B) Copper
- (C) Aluminium
- (D) Wrought iron
9. Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight
- (A) 1.5
- (B) 3
- (C) 5
- (D) 7
10. 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
11. Chlorine acts as a bleaching agent only in the presence of
- (A) Dry air
- (B) Pure oxygen
- (C) Moisture
- (D) Sunlight
12. Case hardening is not done by
- (A) Nitriding
- (B) Hot dipping
- (C) Electroplating
- (D) Both b & c
13. Powder metallurgy technique is used in the production of __________ tools.
- (A) Tungsten carbide
- (B) High carbon steel
- (C) High speed steel
- (D) Drilling
14. Upto the critical radius of insulation, added insulation, will
- (A) Increase the heat loss
- (B) Decrease heat loss and will have no effect beyond that
- (C) Decrease heat flux
- (D) Reduce convection heat loss compared to conduction heat less
15. Rain drops falling through atmospheric air attain limited terminal velocity, because of
- (A) Upward thrust due to air
- (B) Viscous force exerted by air
- (C) Surface tension effects of water
- (D) Force of gravity
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