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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