Online Test on Basics in Chemical Engineering pdf - Set 20 - ObjectiveBooks

Online Test on Basics in Chemical Engineering pdf - Set 20

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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