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Current Affairs January 2024

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Which of the following is an example of cathodic protection of metals against corrosion?

A. Painted steel

B. Galvanised iron

C. Case hardened steel

D. Lead lined reactor

Correct Answer :

B. Galvanised iron


Related Questions

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The most suitable material of construction for a sewer to carry sewage under high pressure is

A. Asbestos cement

B. Steel

C. Cement concrete

D. Stoneware

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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

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Which of the following phenomenon/ phenomena is/are diffusion controlled?

A. Dislocation climb

B. Cross-slip

C. Twinning

D. Recrystallisation

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Glycerine is used as a coolant in cooling of some engines instead of water, because

A. Its higher boiling point (290°C) increases its heat carrying capacity

B. Comparatively less weight of coolant is required

C. Smaller radiator can be used

D. All a, b & c

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Maximum permissible air velocity in pipelines is about __________ metre/second.

A. 5

B. 10

C. 20

D. 40

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In the diving apparatus, helium is used along with oxygen, because it is

A. Easily available

B. Not soluble in blood at high pressure

C. Lighter than nitrogen

D. Completely miscible with oxygen

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Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

A. Fracture

B. Dislocation

C. Slip

D. Twinning

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Brazing is the joining of metals

A. Without melting the base metal

B. With a non-ferrous filler

C. Both (A) & (B)

D. Neither (A) nor (B)

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Tempering of a material does not improve its

A. Machinability

B. Toughness

C. Internal stress level

D. Softness

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Consideration of the creep is the most important in case of the

A. Blades of gas turbine

B. Piston of an I. C. engine

C. Flywheel of steam engine

D. Cycle chain

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Ammonia gas can be dried by

A. PCl5

B. Quick lime

C. CaCl2

D. Concentrated H2SO4

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Out of the following the refractive index is the highest for

A. Glass

B. Diamond

C. Brine

D. Kerosene

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Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A. Manganese

B. Phosphorous

C. Magnesium

D. Chromium

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__________ fluid force is not considered in the Navier-Stokes equation.

A. Turbulent

B. Viscous

C. Gravity

D. Pressure

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A material being tested for endurance strength is subjected to the __________ load.

A. Impact

B. Completely reversed

C. Dynamic

D. Static & dynamic

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Holes for riveting purposes should be preferably made by

A. Cutting torch

B. Drilling

C. Punching

D. None of these

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Which of the following is not a dielectric material?

A. Cotton, silk and paper

B. Asbestos, glass, porcelain and mica

C. Rubber and polymeric resins

D. All refractory materials

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The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

A. Equal to

B. Greater than

C. Less than

D. Either (A), (B) or (C); depends on the size of atom

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Cemented carbide tools are not suitable for cutting

A. Aluminium

B. Brass

C. Cast iron

D. Steel

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Shampoos are commercially not available in the form of

A. Powder

B. Gaseous mixture

C. Solution

D. Emulsion

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A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place

A. The better insulation material should be put just next to pipe (i.e., inside)

B. The better insulating material should be put outside

C. Either of the insulating material could be put on either side

D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

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An oxidation process is accompanied with decrease in the

A. Number of electrons

B. Oxidation number

C. Number of ions

D. All (A), (B) & (C)

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Out of the following, the most malleable material is

A. Copper

B. Aluminium

C. Wrought iron

D. Lead

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Boiling point of water gets lowered at high altitudes (e.g., hills), because

A. Temperature is low

B. Atmospheric pressure is low

C. Atmospheric pressure is high

D. None of these

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In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. Percentage elongation

B. Brinell hardness

C. Tensile strength

D. All 'a', 'b' & 'c'

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Which of the following is not a characteristic observed in material failure by fatigue fracture?

A. Plastic deformation of material does not occur

B. Initiation of crack from below the surface does not occur

C. Initiation of crack occurs on the surface of the machine part

D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

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Increasing sulphur content in pig iron tends to make it

A. Soft

B. Hard

C. Tough

D. Ductile & malleable

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__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A. Natural

B. Neoprene

C. Butadiene

D. Nitrile

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Fahrenheit and Centigrade scales have the same readings at

A. -55°

B. -40°

C. -33°

D. -58°

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In __________ process, there is an increase in entropy with no degradation of energy.

A. Isothermal expansion

B. Isochoric heat addition

C. Polytropic expansion

D. Isobaric heat addition