Practice Test: Question Set - 20
1. Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of
- (A) 90% tungsten carbide and 10% cobalt
- (B) 70% aluminium oxide & 30% silica
- (C) 30% nickel, 15% chromium & 55% tungsten
- (D) 65% tungsten & 35% zirconium
2. Which of the following metals is the most prone to work hardening?
- (A) Brass
- (B) Aluminium
- (C) Copper
- (D) Lead
3. The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the
- (A) Final control element
- (B) On-off control
- (C) Floating control action
- (D) None of these
4. A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is
- (A) 0
- (B) 0.33
- (C) 0.44
- (D) 0.25
5. The substance used as a smoke screen in warfare is
- (A) C2H2
- (B) SiCl4
- (C) P2O5
- (D) PCl5
6. Working of linear variable differential transducer (LVDT) is based on the principle of variable
- (A) Capacitance
- (B) Resistance
- (C) Mutual inductance
- (D) None of these
7. Increasing sulphur content in pig iron tends to make it
- (A) Soft
- (B) Hard
- (C) Tough
- (D) Ductile & malleable
8. The dimensional formula of bulk modulus of elasticity is same as that of the
- (A) Pressure
- (B) Density
- (C) Force
- (D) None of these
9. Fahrenheit and Centigrade scales have the same readings at
- (A) -55°
- (B) -40°
- (C) -33°
- (D) -58°
10. A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?
- (A) Steel
- (B) Glass
- (C) Rubber
- (D) Brass
11. For separating small pieces of metal from engine oil of a car, the best separating technique is the
- (A) Chromatography
- (B) Evaporation
- (C) Filtration
- (D) Fractional distillation
12. The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.
- (A) Two
- (B) Four
- (C) Six
- (D) Eight
13. In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?
- (A) Zirconia
- (B) Alumina
- (C) Bakelite
- (D) Tungsten carbide
14. Machinability of hard alloys and tool steels is improved by
- (A) Spheroidising
- (B) Annealing
- (C) Tempering
- (D) Normalizing
15. In TIG welding, thoriated tungsten electrodes are used, because it
- (A) Has higher current carrying capacity
- (B) Has better electron emissivity
- (C) Is stronger than ordinary tungsten
- (D) Is easy to prepare
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