__________ 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.

Question

__________ 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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Speed of a submarine in deep sea & that of an aeroplane is measured by a/an

A. Pitot tube

B. Hot wire anemometer

C. Rotameter

D. Stroboscope

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Fire refining process is employed in case of

A. Tin

B. Copper

C. Zinc

D. Aluminium

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Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

A. Cobalt, chromium & tungsten

B. Cobalt, chromium & nickel

C. Molybdenum, tungsten & chromium

D. Cobalt, zirconium & molybdenum

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Tempering of a material does not improve its

A. Machinability

B. Toughness

C. Internal stress level

D. Softness

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Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

A. 0.8

B. 7.8

C. 200

D. 10000

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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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Maximum permissible air velocity in pipelines is about __________ metre/second.

A. 5

B. 10

C. 20

D. 40

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Cupola produces __________ iron.

A. Pig

B. Cast

C. Wrought

D. Carbon free

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Temper brittleness of a material can be fairly detected by the __________ test.

A. Fatigue

B. Notched bar impact

C. Tensile

D. Hardness

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Suitability of steel for its use in cable is judged by its strength in

A. Tension

B. Compression

C. Torsion

D. Shear

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The best lubricants for a machine working at high temperature & load is

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

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Pick out the wrong statement about nucleate boiling.

A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface

B. Surface temperature is greater than the saturation temperature of the liquid

C. Heat transfer from the surface of the liquid is less than that in film boiling

D. The temperature is less than that of film boiling

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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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Brittleness induced due to the presence of sulphur in steel can be reduced by adding

A. Manganese

B. Magnesium

C. Vanadium

D. Copper

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Work done by a/an __________ process is determined by ∫p. dv

A. Adiabatic

B. Quasi-static

C. Isothermal

D. Isentropic

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Bad odour in sanitary latrines is reduced by periodically sprinkling

A. Bleaching powder

B. Lime powder

C. Aluminium sulphate

D. None of these

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Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?

A. Styrofoam

B. Lucite

C. Perspex

D. Plexiglass

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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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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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Pressure exerted by a liquid depends upon its

A. Surface tension

B. Density

C. Viscosity

D. Buoyancy

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Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A. Nitrogen oxides

B. Hydrocarbons

C. Both 'a' & 'b'

D. Carbon monoxide

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Cemented carbide tools are not suitable for cutting

A. Aluminium

B. Brass

C. Cast iron

D. Steel

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Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. Re^0.5, Re^0.8

B. Re^0.8, Re^-0.5

C. Re^0.8, Re^0.5

D. Re^-0.8, Re^0.5

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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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Which of the following fastening devices has its both ends threaded?

A. Bolt

B. Stud

C. Set screw

D. Split nut

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For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

A.

B.

C.

D.

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Pick out the wrong statement about the machinability of metals. Machinability of a metal

A. Decreases with increase in strain hardening tendencies

B. Decreases with increase in hardness, in general

C. Depend on the composition, microstructure and physical & mechanical properties

D. Decreases with increases in tensile strength & decrease in grain size

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Projection welding & stud welding is categorised as the __________ welding.

A. Pressure

B. Thermit

C. Resistance

D. Arc

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Fatigue resistance of a material is measured by the

A. Elastic limit

B. Ultimate tensile strength

C. Young's modulus

D. Endurance limit

Discuss this answer

Which of the following is a commonly used manometric liquid for low pressure range?

A. Ethyl alcohol

B. Carbon tetrachloride

C. Glycerol

D. Ethylene glycol

Discuss this answer

Accepted Answer

D. Calorising

__________ 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.

Correct Answer :

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Related Questions

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Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

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

Maximum permissible air velocity in pipelines is about __________ metre/second.

Cupola produces __________ iron.

Temper brittleness of a material can be fairly detected by the __________ test.

Suitability of steel for its use in cable is judged by its strength in

The best lubricants for a machine working at high temperature & load is

Pick out the wrong statement about nucleate boiling.

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

Brittleness induced due to the presence of sulphur in steel can be reduced by adding

Work done by a/an __________ process is determined by ∫p. dv

Bad odour in sanitary latrines is reduced by periodically sprinkling

Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?

Current employed in resistance welding ranges from __________ kVA/.

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

Pressure exerted by a liquid depends upon its

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

Cemented carbide tools are not suitable for cutting

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

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

Which of the following fastening devices has its both ends threaded?

For infinite parallel planes having emissivities ε1 & ε2, the interchange factor for radiation from surface 1 to surface 2 is given by

Pick out the wrong statement about the machinability of metals. Machinability of a metal

Projection welding & stud welding is categorised as the __________ welding.

Fatigue resistance of a material is measured by the

Which of the following is a commonly used manometric liquid for low pressure range?

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