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Current Affairs January 2024

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Titanium is added to molten aluminium alloys before casting for the purpose of

A. Grain refinement

B. Increasing corrosion resistance

C. Reducing porosity

D. Improving fluidity

Correct Answer :

D. Improving fluidity


Related Questions

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Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.

A. Steel

B. Lignite

C. Water

D. Lime stone

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4

Identify the correct statement.

A. Sphlerite is zinc oxide

B. The first law of the thermodynamics is stated as δE = δQ - δW

C. Lead can be produced in a blast furnace

D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

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Hardening of steel is not possible, unless it is heated __________ critical point.

A. Above the highest

B. Above the lowest

C. Between the first & second

D. Between the second & third

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Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

A. Cementite

B. Austenite

C. Martensite

D. Pearlite

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4

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

A. Turbulent

B. Viscous

C. Gravity

D. Pressure

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4

Identify the correct statement with reference to the extractive metallurgy of aluminium.

A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

B. Approximately 80% of the aluminium deposited on the cathode comes from cryolite

C. Sodium is deposited along with aluminium, but is immediately vaporised

D. Anode effect sets in when the cryolite concentration goes below 40%.

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4

Powder metallurgy process does not make metal powder by

A. Atomisation

B. Grinding/milling

C. Hammering

D. Electrolytic deposition

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4

The lightest non-inflammable gas is

A. H2

B. He

C. Ar

D. O2

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4

Laser welding is widely employed in the __________ industries.

A. Electronic

B. Structural

C. Process

D. Heavy

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Which one is neutral in character?

A. N2O4

B. N2O

C. N2O5

D. N2O3

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4

Which of the following phenomenon will exhibit the minimum heat transfer?

A. Boiling

B. Forced convection in air

C. Free convection in air

D. Conduction in air

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4

The starting of a car takes time in winter, because the

A. Octane number of fuel is decreased

B. Fuel supply for ignition is not sufficient

C. Vaporisation of the fuel is decreased

D. Pour point of fuel decreases

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4

For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot?

A. Temperature - entropy

B. Temperature - pressure

C. Enthalpy - entropy

D. Enthalpy-pressure

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4

In multipass welds, shot peening is done after each pass to

A. Close the surface porosity

B. Break the continuity of columnar grains

C. Flatten the weldment

D. Introduce texture in the weld

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4

A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is

A. Lead

B. Glass

C. Mica

D. Silver

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4

The dew point of moist air becomes __________ with decrease in its relative humidity.

A. Less than the wet bulb temperature

B. More than the wet bulb temperature

C. More than the dry bulb temperature

D. Equal to wet bulb temperature

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4

Current employed in resistance welding ranges from __________ kVA/.

A. 1.2 to 2.5

B. 4.5 to 6.2

C. 7.5 to 8.5

D. 10.5 to 15.5

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4

Rain drops falling through atmospheric air attain limited terminal velocity, because of

A. Upward thrust due to air

B. Viscous force exerted by air

C. Surface tension effects of water

D. Force of gravity

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4

Auto collimator is used to check

A. Flatness

B. Angle

C. Rotor balancing

D. Roughness

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Oxyacetylene reducing flame is used while carrying out welding on

A. Alloy steel

B. Grey cast iron

C. Mild steel

D. High carbon steel

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4

The product (s) of roasting of a sulphide ore is (are)

A. Oxide only

B. Sulphate only

C. Oxide and sulphate

D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

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4

Which of the following metals is the most prone to work hardening?

A. Brass

B. Aluminium

C. Copper

D. Lead

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4

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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4

Drills are usually made of

A. Cermets

B. High speed steel

C. Alloy steel

D. Tungsten carbide

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4

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

A. Flow output

B. Head developed

C. Overall efficiency

D. Weight

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__________ 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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Which of the following is not an explosive?

A. TNT

B. CMC

C. RDX

D. Lead azide

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Factor of safety is the ratio of the __________ stress to the working stress.

A. Tensile

B. Compressive

C. Yield

D. Bearing

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4

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by

A. Conduction

B. Convection

C. Radiation

D. Both 'a' & 'b'

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Which of the following is resistant to the action of both heat & chemicals?

A. Borosilicate glass

B. Silica glass

C. Soda lime glass

D. None of these