Practice Test: Question Set - 20
1. An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
- (A) Constantan
- (B) Kanthal
- (C) Chromel
- (D) German silver
2. A bearing metal should not have
- (A) Enough plasticity
- (B) Low thermal conductivity
- (C) Low co-efficient of friction
- (D) High toughness
3. The behavior of visco-elastic material is time dependent. This behavior is common in __________ materials.
- (A) Non-crystalline solid
- (B) Crystalline
- (C) Rubbery
- (D) Non-crystalline organic polymeric
4. 100% H2SO4 at 30°C can't be stored in a vessel made/lined with
- (A) Cast iron and high silicon iron
- (B) Mild steel and stainless steel
- (C) Aluminium, tin and rubber
- (D) Teflon, glass and porcelain
5. A material capable of undergoing large permanent deformation, when subjected to compression is termed as
- (A) Malleable
- (B) Ductile
- (C) Brittle
- (D) None of these
6. Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
- (A) Copper
- (B) Copper alloys
- (C) Stainless steel
- (D) Monel
7. Softness of silver can be converted into hardness by alloying it with small quantity of
- (A) Copper & nickel
- (B) Zinc
- (C) Aluminium
- (D) Tin
8. Which of the following is not a non-ferrous alloy?
- (A) Meehanite
- (B) Magnalium
- (C) Gun metal
- (D) Muntz metal
9. Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
- (A) Shafts
- (B) Flanges
- (C) Gears
- (D) Shear blades
10. Which of the following is a light alloy?
- (A) Monel metal
- (B) Dow metal
- (C) German silver
- (D) Babbitt metal
11. Invar used in thermocouples is an alloy of nickel and
- (A) Iron
- (B) Copper
- (C) Chromium
- (D) Lead
12. Generally __________ are subjected to galvanizing (i.e., zinc coating).
- (A) Non-ferrous metals
- (B) Non-metals
- (C) Low carbon steels
- (D) Stainless steel
13. Hydrochloric acid is __________ corrosive to common metals.
- (A) Least
- (B) Not
- (C) Mildly
- (D) Highly
14. Gunmetal and bronze are not corroded by the action of
- (A) Wet chlorine
- (B) Synthetic detergent solution
- (C) Hydrochloric acid (10%)
- (D) Nitric acid (< 25%)
15. 18-4-1 high speed steel contains 18%, 4% and 1% respectively of
- (A) Tungsten, vanadium and chromium
- (B) Tungsten, chromium and vanadium
- (C) Vanadium, chromium and tungsten
- (D) Chromium, tungsten and vanadium
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