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Current Affairs January 2024

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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

Correct Answer :

B. Martensite formation


Related Questions

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4

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

A. Wet bulb

B. Dry bulb

C. Saturation

D. Dew point

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4

The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the

A. Fatigue strength

B. Creep strength

C. Resilience

D. Endurance limit

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4

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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4

Cementite is in the lamellar form in the __________ phase of steel.

A. Martenistic

B. Bainitic

C. Pearlitic

D. Ferritic

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4

For dynamic strain measurement, the Wheatstone bridge used is of __________ type.

A. Voltage sensitive null

B. Voltage sensitive deflected

C. Current sensitive deflected

D. None of these

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4

__________ flux is used for the extraction of metal from its self fluxing ores.

A. No

B. Acid

C. Basic

D. Neutral

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4

Alloying elements present in Haynes stellite, which has superior performance than high speed steel, are:

A. Nickel, cobalt & chromium

B. Tungsten, chromium & cobalt

C. Manganese, chromium & cobalt

D. Tungsten, molybdenum & nickel

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4

Lead is poured into the joint between two __________ pipes.

A. Mild steel

B. Concrete

C. Cast iron

D. Asbestos cement

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4

Tin based white metals are used, where bearings are subjected to

A. High pressure & load

B. Low pressure & load

C. High temperature

D. Large surface wear

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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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4

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

A. Evaporative capacity

B. Evaporation efficiency

C. Thermal efficiency

D. Steam load

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4

For grinding of softer materials, the grinding wheel should have __________ grain size.

A. Finer

B. Coarser

C. Medium

D. Any type of

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4

High endurance limit of carburised machine parts is because of the fact that carburisation

A. Suppresses any stress concentration produced in the parts

B. Enhances the yield point of the material

C. Introduces a compressive layer on the surface

D. Produces a better surface finish

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4

Most of the phosphorous present in the blast furnace burden enters into

A. Hot metal

B. Flue gases

C. Slag

D. Refractory lining

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4

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

A. Black

B. Silver grey

C. Green

D. Yellow

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4

Presence of nickel & chromium in steel does not raise its

A. Elastic limit

B. Machining properties

C. Ductility

D. Resilience

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4

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

Brazing filler metal used for joining steel plates

A. Melts below the melting points of base metals

B. Melts below 300°C

C. Is copper phosphorous alloy

D. Is copper

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4

__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.

A. Collar

B. Flanged

C. Bell and Spigot

D. Expansion

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4

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More

B. Equal

C. Less

D. Double

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4

In connection with corrosion of metals, passivation is the process that

A. Intensifies deterioration

B. Changes the composition of the metal

C. Inhibits further deterioration

D. None of these

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4

__________ stress cannot be sustained by a fluid in equilibrium.

A. Shear

B. Tensile

C. Compressive

D. None of these

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4

Production of a hollow product by inflation of a tube or parison is called the __________ process.

A. Blow moulding

B. Calendaring

C. Extrusion

D. Injection

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4

Steel balls are manufactured by

A. Sintering

B. Casting

C. Cold heading

D. Spinning

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4

A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is

A. -0.8

B. 0.8

C. +0.08

D. -0.24

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4

Cascade control is

A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller

B. Used when changes in process conditions cause serious upsets in the controlled variable

C. Useful to control flow from temperature

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

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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

The leaching solvent used in Baeyer's process for the purification of bauxite is

A. Ammonium hydroxide

B. Sodium carbonate

C. Sodium hydroxide

D. Ammonium carbonate

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4

The most abundant metal present in the earth's crust is;

A. Iron

B. Copper

C. Titanium

D. Aluminium

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4

Non-ferrous alloys used for making cutting tools need not have high

A. Abrasion resistance

B. Toughness

C. Red hardness

D. Cutting speed