Practice Test: Question Set - 44
1. Addition of __________ to steel does not help in improving its machinability.
- (A) Sulphur
- (B) Silicon
- (C) Lead
- (D) Phosphorous
2. 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
3. __________ can replace tungsten in high speed steel.
- (A) Chromium
- (B) Vanadium
- (C) Cobalt
- (D) Molybdenum
4. Electrometallurgical methods of metal extraction is normally used for those metals
- (A) Whose oxide/ore is not reduced by carbon
- (B) Which fall in the category of alkali & alkaline earth metals
- (C) Which stands higher in the electrochemical
series of the metal
- (D) All (a), (b) & (c)
5. Multistage compression of air as compared to single stage compression offers the advantage of
- (A) Power saving per unit weight of air delivered
- (B) Moisture elimination in the inter-stage cooler
- (C) Increased volumetric efficiency
- (D) All (a), (b) & (c)
6. In electrical resistance welding, distortion results from the use of improper
- (A) Clamping methods
- (B) Electrodes
- (C) Current
- (D) Filler material
7. Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________ kJ.
- (A) +4000
- (B) -4000
- (C) 10000
- (D) -10000
8. 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 & rpm
9. Age hardening is connected with
- (A) Babbitt metal
- (B) Gun metal
- (C) Stainless steel
- (D) Duralumin
10. 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)
11. Percentage of argon (by volume) in dry atmospheric air is about
- (A) 0.09
- (B) 0.3
- (C) 0.57
- (D) 0.94
12. A compact estimate about the amount of materials handling between various work stations is obtained from the
- (A) Gantt chart
- (B) Bin chart
- (C) String diagram
- (D) Travel chart
13. __________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.
- (A) Veneering
- (B) Galvanizing
- (C) Electroplating
- (D) Calorising
14. In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.
- (A) Percentage elongation
- (B) Brinell hardness
- (C) Tensile strength
- (D) All 'a', 'b' & 'c'
15. Normalizing of a casting does not
- (A) Induce stresses in it
- (B) Refine its grain structure
- (C) Reduce segregation
- (D) Improve its mechanical properties
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