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Current Affairs January 2024

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

A. Dislocation climb

B. Cross-slip

C. Twinning

D. Recrystallisation

Correct Answer :

D. Recrystallisation


Related Questions

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__________ the exhaust gas is an indication of the incomplete combustion of fuel.

A. Low temperature of

B. High temperature of

C. High % of CO in

D. High % of CO2 in

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Transformer cores are normally made from

A. Soft ferrites

B. High purity iron

C. Grain oriented Fe-Si alloy

D. Al-Ni-Co alloy

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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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Matte smelting is used in the extraction of

A. Lead

B. Zinc

C. Aluminium

D. Copper

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What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

A. 2

B. 8

C. 10

D. 40

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Lead is poured into the joint between two __________ pipes.

A. Mild steel

B. Concrete

C. Cast iron

D. Asbestos cement

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The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

A. Cyaniding

B. Sherardizing

C. Spheroidising

D. None of these

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4

Load cells used for the measurement of weight has

A. Compact & rugged construction with an accuracy of 0.1 to 1%

B. No moving parts and incurs negligible deflection under load

C. Provision of thermal compensation and is hermetically sealed

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

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Which of the following is used to produce draught in the locomotive boilers?

A. Chimney

B. Induced draught fan

C. Forced draught fan

D. Steam jet arrangement

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Name the safety device used to protect the boiler, when the water level falls below a minimum level.

A. Blow down valve

B. Blow off cock

C. Fusible plug

D. Safety valve

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4

Dephosphorization of molten pig iron is favoured by

A. Oxidising and basic slag

B. Reducing and basic slag

C. High activity co-efficient of phosphorous in metal

D. Oxidising and neutral slag

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Case hardening is not done by

A. Nitriding

B. Hot dipping

C. Electroplating

D. Both b & c

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Diamagnetic materials

A. Are magnetised by eddy currents only

B. Are non-magnetic and cannot be magnetised

C. Are magnetised in direction opposite to the magnetic field

D. Can be magnetised in one direction only

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Which of the following fastening devices has a head at one end and a nut fitted to the other?

A. Bolt

B. Stud

C. Top bolt

D. None of these

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Projection welding & stud welding is categorised as the __________ welding.

A. Pressure

B. Thermit

C. Resistance

D. Arc

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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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Fine grained steels have

A. High brittleness

B. Higher tendency to distort

C. High ductility

D. None of these

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Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

A. Enthalpy

B. Relative humidity

C. Wet bulb temperature

D. Dew point temperature

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Austempering of steel requires it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to

A. Sorbite

B. Bainite

C. Martensite

D. Troostite

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Maximum hardenability of steel depends upon its

A. Chemical composition

B. Carbon content

C. Grain size

D. Alloying elements content

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Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.

A. Flanged iron

B. Collar

C. Flexible

D. Expansion

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Ganister contains maximum percentage of

A. FeO

B. SiO2

C. MgO

D. MnO2

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The mechanism involved in the removal of metal in drilling operation is by

A. Compression

B. Extrusion

C. Shearing

D. Both 'b' & 'c'

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4

Fibre glass is a composite material of

A. Glass fibre in a polymer matrix

B. Glass fibre in a metallic matrix

C. Polymer fibre in a glassy matrix

D. Both 'b' & 'c'

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Exposure to __________ accelerates the degradation of plastics.

A. Ultraviolet radiation

B. High atmospheric temperature

C. High ambient temperature

D. Damp atmosphere

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The property of material, by which a given amount of energy is absorbed by it, without plastic deformation, is called

A. Resilience

B. Toughness

C. Ductility

D. Impact strength

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A solar cell converts the sunlight directly into __________ energy.

A. Thermal

B. Electrical

C. Mechanical

D. Chemical

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The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

A. 100

B. 200

C. 1000

D. 2000

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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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Which of the following is an acidic constituent of B.F. slag?

A.

B. FeO

C. MgO

D. CaO