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Current Affairs January 2024

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4

The difference between gross & net calorific values of fuel is due to the

A. Sensible heat carried away by the flue gases

B. Heat carried away by the steam from the moisture content of the fuel

C. Heat lost by radiation

D. Heat carried away by steam from the combustion of hydrogen in the fuel

Correct Answer :

D. Heat carried away by steam from the combustion of hydrogen in the fuel


Related Questions

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4

Joule-Thomson co-efficient is the ratio of

A. Pressure change to temperature change occuring during adiabatic compression of a gas

B. Pressure change to temperature change occuring during adiabatic throttling of a gas

C. Temperature change to pressure change occuring during adiabatic compression of a gas

D. Temperature change to pressure change occuring during adiabatic throttling of a gas

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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

__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

A. Veneering

B. Galvanising

C. Electroplating

D. Calorising

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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

Screws are specified by their __________ diameters.

A. Minor

B. Major

C. Pitch

D. None of these

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4

The burnout heat flux in the nucleate boiling regime is not a function of the

A. Liquid density

B. Vapour density

C. Temperature difference

D. Heat of evaporation

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4

In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of

A. Stainless steel

B. Mild steel

C. High speed steel

D. High carbon steel

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4

Steel & cast iron pipes are produced by __________ casting.

A. Slush

B. Die

C. Investment

D. True centrifugal

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4

The refrigerant freon-12 is chemically

A. CCl2F2

B. CCl3F

C. CClF3

D. CCl4F

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4

Broaching tools are usually made of

A. Cermets

B. High speed steel

C. Tungsten carbide

D. Stellite

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4

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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4

__________ of grey cast iron produces white cast iron.

A. Tempering

B. Rapid heating

C. Rapid cooling

D. Slow cooling

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4

Pick out the wrong statement.

A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'

B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials

C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces

D. Tungsten steel and alnico are not hard magnetic materials

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4

Normalising of an object does not

A. Refine coarse grain structure obtained during hot working

B. Improve ductility

C. Improve yield strength

D. Improve mechanical properties

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4

Diffusion co-efficient of a metal in a solid solution depends upon its

A. Composition

B. Temperature

C. Both (A) & (B)

D. Neither (A) nor (B)

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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

An ideal material for making cooking vessels should have

A. High heat capacity

B. Low heat capacity

C. High thermal conductivity

D. Both (B) and (C)

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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

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4

Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.

A. Slip

B. Fracture

C. Winning

D. Dislocation

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4

Pressure exerted by a liquid depends upon its

A. Surface tension

B. Density

C. Viscosity

D. Buoyancy

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4

Maximum permissible sulphur content in steel is __________ percent.

A. 0.015

B. 0.055

C. 0.505

D. 0.805

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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

Age hardening is connected with

A. Babbitt metal

B. Gun metal

C. Stainless steel

D. Duralumin

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4

In the acid Bessemer process, the hot metal should have the following composition.

A. S < 0.05% and P < 0.05%

B. S < 0.05% and P < 1.5%

C. S < 0.05% and P > 1.5%

D. S > 1.5% and P < 0.05%

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4

Recrystallisation temperature of steel is __________ °C.

A. 50

B. 300

C. 500

D. 800

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4

Unit of surface tension in S.I. unit is

A. Watt/m

B. Joule/

C. Newton/

D. Joule/m

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4

Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

A. Volume

B. Pressure

C. Heat

D. None of these

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4

Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

A. Cold

B. Work

C. Age

D. Induction

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4

Nitriding of a steel part does not increase its

A. Grain size

B. Fatigue limit

C. Surface hardness

D. Wear resistance

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4

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A. 10-3

B. 103

C. 10-15

D. 1015