Practice Test: Question Set - 05
1. The material used for coating the welding electrode is termed as the
- (A) Flux
- (B) Slag
- (C) Protective layer
- (D) Binder
2. In an eutectic system, two elements are completely
- (A) Soluble in solid state
- (B) Insoluble in liquid state
- (C) Insoluble in both solid & liquid state
- (D) Soluble in liquid state
3. Identify the correct statement.
- (A) Sphlerite is zinc oxide
- (B) The first law of the thermodynamics is stated as δE = δQ -
δW
- (C) Lead can be produced in a blast furnace
- (D) T. ferrooxidans is a fungus that can be used for leaching
chalcopyrite
4. Hot extrusion process is not used for making
- (A) Cast iron pipe for domestic water supply
- (B) Aluminium curtain rods
- (C) Stainless steel tubes used in furnitures
- (D) Any of these
5. _________ remains constant during the adiabatic cooling of moist air.
- (A) Wet bulb temperature
- (B) Dry bulb temperature
- (C) Relative humidity
- (D) Specific humidity
6. Basicity [%Cao + %MgO + %SiO2) of the slag in Indian blast furnace is in the range of
- (A) 0.7-1.0
- (B) 1.1-1.4
- (C) 1.5 - 1.8
- (D) 2.0 - 2.5
7. Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.
- (A) Bomb
- (B) Throttling
- (C) Junker's
- (D) Boy's
8. The most commonly used moderator in nuclear power plants is
- (A) Graphite
- (B) Light water
- (C) Heavy water
- (D) Beryllium
9. The dew point of moist air becomes __________ with decrease in its relative humidity.
- (A) Less than the wet bulb temperature
- (B) More than the wet bulb temperature
- (C) More than the dry bulb temperature
- (D) Equal to wet bulb temperature
10. Yield strength of a material is determined by the __________ test.
- (A) Creep
- (B) Tension
- (C) Compression
- (D) Endurance
11. Thermistors are used in __________ devices.
- (A) Voltage measuring
- (B) Temperature measuring
- (C) Temperature compensating
- (D) Both (b) & (c)
12. An ideal material for making cooking vessels should have
- (A) High heat capacity
- (B) Low heat capacity
- (C) High thermal conductivity
- (D) Both (b) and (c)
13. Which of the following is an example of stress corrosion?
- (A) Season cracking of brass
- (B) Caustic embrittlement of steel
- (C) Both (a) & (b)
- (D) Neither (a) nor (b)
14. Annealing of cast iron
- (A) Softens it to facilitate machining
- (B) Decreases the free carbon
- (C) Increases the strength
- (D) None of these
15. Secondary hardening in steels arises out of the
- (A) Precipitation of fine alloy carbides at high
temperatures
- (B) Refinement of ferrite grain size by working
- (C) Decomposition of retained austenite upon heat treatment
- (D) Precipitation of complex inter-metallic upon heat treatment
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