Basic Chemical Engineering Interview Questions and Answers - Set 30 - ObjectiveBooks

Basic Chemical Engineering Interview Questions and Answers - Set 30

Practice Test: Question Set - 30

1. Which of the following is the largest quantum of pressure?
    (A) 1 kg/cm2
    (B) 1 bar
    (C) 1 atmosphere
    (D) 1 kilo Pascal

2. The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is
    (A) Magnesite
    (B) Chrome
    (C) Silica
    (D) Fireclay

3. Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at
    (A) High vacuum
    (B) Zero pressure
    (C) 0°K
    (D) Earth's center

4. __________ temperature remains constant during adiabatic saturation process of unsaturated air.
    (A) Dew point
    (B) Dry bulb
    (C) Wet bulb
    (D) None of these

5. In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
    (A) Less
    (B) More
    (C) Equal
    (D) Unpredictable

6. Resilience of a bolt can be increased by increasing its
    (A) Length
    (B) Shank diameter
    (C) Head diameter
    (D) None of these

7. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
    (A) Fatigue strength
    (B) Creep strength
    (C) Resilience
    (D) Endurance limit

8. Maximum permissible air velocity in pipelines is about __________ meter/second.
    (A) 5
    (B) 10
    (C) 20
    (D) 40

9. Hot working of lead is carried out at
    (A) 75°C
    (B) 373°K
    (C) 150°C
    (D) Room temperature

10. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
    (A) Styrofoam
    (B) Lucite
    (C) Perspex
    (D) Plexiglass

11. The Al2O3 content of cryolite in Hall-Heroult cell is maintained between __________ percent.
    (A) 2-5
    (B) 18-20
    (C) 12-15
    (D) 6-12

12. Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.
    (A) Annealing
    (B) Toughening
    (C) Work hardening
    (D) Tempering

13. Fatigue resistance of a material is measured by the
    (A) Elastic limit
    (B) Ultimate tensile strength
    (C) Young's modulus
    (D) Endurance limit

14. In a neutral solution
    (A) H+ ions are absent
    (B) OH- ions are absent
    (C) Both H+ and OH- ions are present in very small but equal concentration
    (D) None of these

15. Ultimate strength in tension as compared to that in shear for steel is
    (A) Half
    (B) One third
    (C) One and half times
    (D) One fourth

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