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Current Affairs January 2024

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4

Drills are usually made of

A. Cermets

B. High speed steel

C. Alloy steel

D. Tungsten carbide

Correct Answer :

B. High speed steel


Related Questions

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4

Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?

A. 9,100

B. 13,000

C. 7,000

D. 2,550

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4

The specific gravity of coal depends mainly on its __________ content.

A. Carbon

B. Volatile matter

C. Ash

D. Moisture

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4

Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.

A. 70 & 30

B. 30 & 70

C. 50 & 50

D. 90 & 10

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4

Potable water means the water used for

A. Fire-fighting

B. Cooling

C. Drinking

D. Evaporation to produce steam

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4

With increase in temperature, the electrical conductivity of a __________ decreases.

A. Semi-conductor

B. Metal or alloy

C. Dielectric

D. None of these

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4

A jig is used while __________ a hole.

A. Boring

B. Counter boring

C. Drilling

D. Enlarging

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4

Colour comparator is used to measure the

A. pH value

B. Electrode potential

C. Colour intensity

D. None of these

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4

A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about __________ °C.

A. 370

B. 340

C. 320

D. 300

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4

Reduction in the grain size reduces the __________ of the material.

A. Fatigue resistance

B. Tensile strength

C. Creep resistance

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

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4

Batch process is preferred over continuous process, when the

A. Product yields and quality cannot be achieved in continuous process, because of long residence time

B. Sales demand of product is not steady

C. Same equipment cannot be used for several processes of the same nature

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

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4

Insulation of liquid surface can be achieved by __________ on top of its surface.

A. Floating hollow polypropylene spheres

B. Spraying alumina powder

C. Putting cement

D. None of these

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4

Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot

A. Piercing

B. Spinning

C. Drawing

D. Extrusion

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4

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

A. Increases

B. Decreases

C. Remain constant

D. Increases to a maximum before decreasing

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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

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

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm2.

A. 6

B. 18

C. 38

D. 52

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4

L.D. (Linz-Donawitz) converter is used in the production of

A. Copper

B. Steel

C. Zinc

D. Aluminium

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4

A material subjected __________ must have high resilience.

A. Shock loading

B. Vibration

C. Fatigue

D. Tension

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4

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that

A. Pure oxygen has been used for combustion

B. Nitrogen percentage in the fuel is very high

C. Excess air has been used for combustion

D. Hydrogen is not present in the fuel

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4

Tesla metre per ampere (T. m/A) is the unit for the measurement of

A. Magnetic susceptibility

B. Magnetic moment

C. Permeability of free space

D. Flux density

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4

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, = velocity gradient).

A.

B.

C.

D.

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4

During sensible cooling of air, its wet bulb temperature

A. Decreases but dew point remains constant

B. Increases but dew point remains constant

C. Increases & the dew point decreases

D. Decreases & the dew point increases

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4

Galvanic corrosion cannot be prevented by

A. Cathodic protection

B. Anodic protection

C. Usage of largest possible anodic area

D. Any one of these

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4

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

A. Scratch

B. Indentation

C. Dynamic

D. Rebound

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4

Hot extrusion of aluminium is done in the temperature range of __________ °C.

A. 550-600

B. 450-500

C. 350-400

D. 250-300

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4

The product out from a cupola is called

A. Wrought iron

B. Pig iron

C. Cast iron

D. None of these

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4

Ferromagnetic materials owe their properties to __________ inner sub-shells.

A. Completely filled

B. Partially filled

C. Equally filled

D. Vacant

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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

In a neutral solution

A. H+ ions are absent

B. OH- ions are absent

C. Both H+ and OH- ions are present in very small but equal concentration

D. None of these

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4

The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

A. Water alkalinity & leakage

B. Hydrazine addition during feed water treatment

C. Release of non-condensable gas from water in the boiler

D. Scale formation