Basic Chemical Engineering Questions and Answers - Set 27 - ObjectiveBooks

Basic Chemical Engineering Questions and Answers - Set 27

Practice Test: Question Set - 27


1. One face of a furnace wall is at 1030°C and the other face is exposed to room temperature (30°C). If the thermal conductivity of furnace wall is 3 W. m-1. k-1 and the wall thickness is 0.3 m, the maximum heat loss (in W/m) is
    (A) 100
    (B) 900
    (C) 9000
    (D) 10000

2. The following type of bonding is strongly directional in solids.
    (A) Vander Waal's
    (B) Ionic
    (C) Metallic
    (D) Covalent

3. On being hit with a hammer, __________ will readily fracture.
    (A) Brass
    (B) Mild steel
    (C) Cast iron
    (D) Lead

4. Which of the following is not a principal alloying element for the structural steel?
    (A) Molybdenum
    (B) Nickel
    (C) Manganese
    (D) Chromium

5. The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.
    (A) 60 - 100
    (B) 400 - 700
    (C) 1200 -1500
    (D) 2000 - 2300

6. Which of the following rays has the least wavelength?
    (A) Ultraviolet rays
    (B) Infrared rays
    (C) Cosmic rays
    (D) X-rays

7. Which of the following does not have a sharp melting point?
    (A) Thoria
    (B) Glass
    (C) Ice
    (D) Pig iron

8. Absolute zero pressure can be attained at a temperature of
    (A) 0°C
    (B) 50°K
    (C) 0°R
    (D) None of these

9. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
    (A) Strain rate is increased
    (B) Grain size is increased
    (C) Prior cold deformation is increased
    (D) Not affected by any of the above parameters

10. Recrystallisation temperature of steel is __________ °C.
    (A) 50
    (B) 300
    (C) 500
    (D) 800

11. Corrosion of metals cannot be prevented by its
    (A) Tempering
    (B) Chromising
    (C) Aluminising
    (D) Alloying

12. __________ is the most suitable lubricant for drawing mild steel wires?
    (A) Kerosene
    (B) Water
    (C) Sodium stearate
    (D) Lime water

13. Metalloids
    (A) Are good conductor of heat & electricity
    (B) Act as electron donors with metals & as electron acceptor with non-metals
    (C) Are not necessarily solids at room temperature
    (D) Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

14. Fog is an example of colloidal system of
    (A) Solid dispersed in gas
    (B) Solid dispersed in liquid
    (C) Liquid dispersed in gas
    (D) Gas dispersed in liquid

15. Use of flux during soldering is done to
    (A) Increase fluidity of solder by lowering its melting temperature
    (B) Prevent oxide formation
    (C) Wash away surplus solder
    (D) Full up the joint gap

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