Practice Test: Question Set - 18
1. Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.
- (A) Copper
- (B) Steel
- (C) Aluminium
- (D) Brass
2. Water-tube boiler is the one, in which
- (A) Water passes through tubes and flue gases around it
- (B) Tube carrying hot flue gases are immersed in a pool of water
- (C) Tubes are placed in vertical position
- (D) None of these
3. Silicon in steel
- (A) Makes it usable in almost all magnetic circuits where alternating
current is used
- (B) Increases its electrical resistivity and decreases the hysteresis
loss
- (C) Is present upto 5% & 4% respectively when used in transformers
& motor armatures
- (D) All 'a', 'b' & 'c'
4. Ferromagnetic materials owe their properties to __________ inner sub-shells.
- (A) Completely filled
- (B) Partially filled
- (C) Equally filled
- (D) Vacant
5. Superheating of steam is done at constant
- (A) Enthalpy
- (B) Entropy
- (C) Pressure
- (D) Volume
6. The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.
- (A) Silicon
- (B) Carbon
- (C) Phosphorous
- (D) Chromium
7. Corrosion is
- (A) A physical phenomenon
- (B) A chemical phenomenon
- (C) Same as erosion
- (D) An uncontrollable phenomenon
8. Pick out the wrong statement.
- (A) Copper is the metal having the highest electronic conductivity
- (B) Hardenability & Weldability of metals are inversely related
- (C) Covalent bonding formed by sharing of electrons
is present in all semi-conductor materials
- (D) Glass transition temperature applies to 'polymers' but not to
'glasses'
9. Which of the following phenomenon will exhibit the minimum heat transfer?
- (A) Boiling
- (B) Forced convection in air
- (C) Free convection in air
- (D) Conduction in air
10. Out of the following, which will fracture most readity, when hit with a hard hammer?
- (A) Brass
- (B) Bronze
- (C) German silver
- (D) Cast iron
11. Which of the following metals cannot be hot worked at room temperature?
- (A) Zinc
- (B) Nickel
- (C) Lead
- (D) Tin
12. _________ stress cannot be sustained by a fluid in equilibrium.
- (A) Shear
- (B) Tensile
- (C) Compressive
- (D) None of these
13. Which of the following equipments is used for liquid dispersion?
- (A) Packed column
- (B) Venturi scrubber
- (C) Bubble cap plate column
- (D) Wetted wall column
14. Oxyacetylene reducing flame is used while carrying out welding on
- (A) Alloy steel
- (B) Grey cast iron
- (C) Mild steel
- (D) High carbon steel
15. Limestone is added in the blast furnace (during pig iron manufacture) to
- (A) Form slag by combining with impurities
- (B) Supply heat by undergoing exothermic reaction with impurities
- (C) Reduce the coke consumption
- (D) Reduce slag viscosity
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