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Current Affairs January 2024

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4

Pick out the wrong statement about coating/electroplating of metals.

A. Phosphate coating is used as an excellent base for paints & enamels

B. Phosphate coating is less corrosion resistant than chromate coating

C. The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode

D. Calorising is the process of coating steel with chromium

Correct Answer :

D. Calorising is the process of coating steel with chromium


Related Questions

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Glass reacts with

A. H2SO3

B. HF

C. HNO3

D. K2Cr2O7

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4

A dummy activity is used in PERT network to describe the

A. Precedence relationship

B. Resource idleness

C. Resource restriction

D. Necessary time delay

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4

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)

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4

Which of the following is prone to cup and cone fracture?

A. Cast iron

B. Soft brass

C. Round specimen of ductile metal

D. Flat tensile specimen of ductile metal

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4

The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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4

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

A. Retained austenite

B. Martensite formation

C. Relatively high sulphur content in the base metal

D. Sufficient hydrogen present in the welding arc

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4

In a totally irreversible isothermal expansion process for an ideal gas, ΔE = 0, ΔH = 0. Then ΔQ and ΔS will be

A. ΔQ = 0, ΔS=0

B. ΔQ = 0, ΔS = +ve

C. ΔQ = 0, ΔS = -ve

D. ΔQ = +ve, ΔS= +ve

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4

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A. 10-3

B. 103

C. 10-15

D. 1015

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4

Larger length & diameter water pipes are made by

A. Electrical resistance welding

B. Die casting

C. Semi-centrifugal casting

D. Continuous casting

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4

The order of a chemical reaction

A. Can be determined only experimentally

B. Can be determined from the stoichiometry of the reaction

C. Cannot be zero

D. Can be fractional

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4

To improve the machinability of steel, it is generally subjected to

A. Spheroidising

B. Tempering

C. Normalising

D. Annealing

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The activity of pure hydrogen gas at 1000°C and 5 atm pressure

A. Is always less than 1

B. Is always greater than 1

C. Can be 5

D. Depends on the choice of the standard state

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4

Nusselt number/Biot number varies

A. Inversely with thermal conductivity

B. Directly with heat transfer co-efficient

C. Directly with thermal conductivity

D. Inversely with the dimension of the solid

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4

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

A. 1.5

B. 3

C. 5

D. 7

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4

Auto collimator is used to check

A. Flatness

B. Angle

C. Rotor balancing

D. Roughness

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4

The underground well of a biogas plant is called the

A. Septic tank

B. Oxidation well

C. Digestor

D. Lagoon

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Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at

A. High vacuum

B. Zero pressure

C. 0°K

D. Earth's centre

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4

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

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4

The majority charge carriers in p-type silicon are

A. Free electrons

B. Ions

C. Conduction electrons

D. Holes

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4

Brittleness induced due to the presence of sulphur in steel can be reduced by adding

A. Manganese

B. Magnesium

C. Vanadium

D. Copper

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Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

A. A

B. l

C. A2

D. Both 'a' & 'b'

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4

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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4

Wrought iron is never shaped by

A. Casting

B. Cold working

C. Forging

D. Welding

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4

Pick out the correct statement.

A. Hot worked materials are subjected to annealing to remove internal stresses

B. Annealing of steel hardens it slightly

C. Normalising of a material induces stresses

D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

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4

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

A. Base and strong acid

B. Base and weak acid

C. Acid and weak base

D. None of these

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4

Which of the following alloying elements is present in maximum percentage in high speed steel?

A. Molybdenum

B. Chromium

C. Tungsten

D. Vanadium

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4

According to thermodynamic Fahrenheit scale, the fundamental interval between ice point to steam point is

A. 180°

B. 212°

C. 32°

D. 273°

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Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

A. Hot rolled mild

B. Cold rolled mild

C. Forged

D. Machinable stainless

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An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.

A. Adiabatic

B. Isothermal

C. Isentropic

D. Isochoric

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Routing in production, planning & control is concerned with the

A. Sequence of operation to be performed

B. Progress of work performed

C. Authorisation of work to be performed

D. Balancing of load on machines