Practice Test: Question Set - 39
1. __________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.
- (A) Borosilicate
- (B) High silica
- (C) Supermax
- (D) Lead
2. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
- (A) White
- (B) Cast
- (C) Wrought
- (D) Pig
3. Cold working of a material results in increase in hardness, which is termed as the __________ hardening.
- (A) Cold
- (B) Work
- (C) Age
- (D) Induction
4. Which one is neutral in character?
- (A) N2O4
- (B) N2O
- (C) N2O5
- (D) N2O3
5. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
- (A) Length of the pipe
- (B) Diameter of the pipe
- (C) Density of the fluid
- (D) Velocity of the fluid
6. The normal stress is the same in all directions at a point in a fluid, only when the fluid
- (A) Is at rest & has zero viscosity
- (B) Is frictionless
- (C) Fluid layer has no motion relative to an adjacent layer of fluid
- (D) Is incompressible & frictionless
7. Softening of hardened steel is done by its
- (A) Normalizing
- (B) Tempering
- (C) Annealing
- (D) Carburizing
8. Hot extrusion of aluminium is done in the temperature range of __________ °C.
- (A) 550-600
- (B) 450-500
- (C) 350-400
- (D) 250-300
9. Potable water means the water used for
- (A) Fire-fighting
- (B) Cooling
- (C) Drinking
- (D) Evaporation to produce steam
10. Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.
- (A) 10
- (B) 20
- (C) 30
- (D) 40
11. Which of the following gases cause global warming?
- (A) Carbon monoxide
- (B) Carbon dioxide
- (C) Nitrogen
- (D) Ozone
12. What is the pH of distilled water?
- (A) 0
- (B) 1
- (C) 7
- (D) 14
13. Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about
- (A) 9 : 1
- (B) 17 : 1
- (C) 23 : 1
- (D) 29 : 1
14. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as
- (A) Re0.5, Re0.8
- (B) Re0.8, Re-0.5
- (C) Re0.8, Re0.5
- (D) Re-0.8, Re0.5
15. Photographic plates are coated with
- (A) Silver nitrate
- (B) Silver halide
- (C) Calcium silicate
- (D) Metallic silver
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