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Current Affairs January 2024

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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

Correct Answer :

A. Manganese


Related Questions

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4

The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

A. Magnesite

B. Chrome

C. Silica

D. Fireclay

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4

Eutectoid composition of carbon steel at room temperature is

A. Cementite

B. Pearlite

C. Martensite

D. Ferrite

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4

Function of fusible plug in a boiler is to

A. Drain out water and sludge from the boiler during repair

B. Put off fire in the furnace when water level in the boiler falls to unsafe limit

C. Guard the boiler in case of abnormal rise in steam pressure

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

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4

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

A. More

B. Less

C. Equal

D. Much more

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4

Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

A. Grey

B. Black

C. Opaque

D. White

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4

Silicon percentage in the silicon steel used for electrical appliances/equipments is

A. 0.3-0.4

B. 12-14

C. 3-4

D. 20-25

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4

Which of the following is not used as a bearing material?

A. Copper-lead alloys

B. Babbitts

C. Bronzes

D. Cermets

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4

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

A. Critical

B. Breeder

C. Fertile

D. Heterogeneous

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4

Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.

A. Annealing

B. Toughening

C. Work hardening

D. Tempering

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4

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

A. Linearly

B. Exponentially

C. Logarithmically

D. Inversely

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4

The emf of a Deniell cell Zn | Zn2+ || Cu2+ | Cu can be increased by

A. Decreasing the surface area of the electrodes

B. Increasing the concentration of zinc sulphate solution

C. Increasing the surface area of the electrodes

D. Increasing the concentration of copper sulphate solution

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4

Which of the following forces does not act on a fluid at rest?

A. Viscous force

B. Gravity force

C. Hydrostatic force

D. Surface tension force

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4

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?

A. Emissivity of pipe surface

B. Diameter & length of the pipe

C. Temperature of hot pipe surface & that of air in the room

D. None of these

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4

Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per of steel strip.

A. 5-10

B. 1000-1500

C. 120-500

D. 1500-3000

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4

While the bin cards are used in the effective stores management, the queuing theory is associated with the __________ time.

A. Waiting

B. Idle

C. Inspection

D. Tool replacement

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4

Coarse grained steels have

A. Low toughness

B. No tendency to distort

C. High density

D. Very high toughness

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4

Specific __________ is a dimensionless quantity.

A. Heat

B. Humidity

C. Weight

D. None of these

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4

Out of the following, the joint produced by __________ has the lowest strength.

A. Soldering

B. Welding

C. Brazing

D. Riveting

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4

Which of the following is not a principal alloying element for the structural steel?

A. Molybdenum

B. Nickel

C. Manganese

D. Chromium

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4

Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.

A. Concentration

B. Velocity

C. Temperature

D. None of these

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4

Nickel is a __________ material.

A. Ferromagnetic

B. Semi-conductor

C. Paramagnetic

D. Ferroelectric

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4

The co-ordination number in simple cubic structure is

A. 4

B. 6

C. 8

D. 12

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4

__________ metal is used as a bearing liner material.

A. Pewter

B. White

C. Babbitt

D. Gun

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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

Hot extrusion process is not used for making

A. Cast iron pipe for domestic water supply

B. Aluminium curtain rods

C. Stainless steel tubes used in furnitures

D. Any of these

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4

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/sec2 is

A. 8.82

B. 9.81

C. 10.88

D. 0.95

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4

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2.

A. 10

B. 30

C. 50

D. 80

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4

Titanium is produced by __________ of Ti Cl4.

A. Electrolytic reduction

B. Calcium reduction

C. Magnesium reduction

D. Thermal dissociation

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4

The product of a commercial direct reduction process is

A. Liquid iron

B. Solid iron

C. Sponge iron

D. Iron saturated with carbon

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4

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

A. Compression

B. Extrusion

C. Shearing

D. Both 'b' & 'c'