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4

High speed steel tools retain their hardness upto a temperature of __________ °C.

A. 500

B. 750

C. 900

D. 1100

Correct Answer :

C. 900


Related Questions

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4

Which of the following if present in iron ore, enhances its value?

A. Alumina

B. Alkali oxide

C. Lime & Magnesia

D. None of these

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4

Which of the following is not an explosive?

A. TNT

B. CMC

C. RDX

D. Lead azide

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4

Multistage compression of air as compared to single stage compression offers the advantage of

A. Power saving per unit weight of air delivered

B. Moisture elimination in the inter-stage cooler

C. Increased volumetric efficiency

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

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4

Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties

B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness

C. Induction hardening and flame hardening techniques are also used for surface hardening

D. Martempering of a material is a hardening process

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4

Which of the following is preferred for riveting?

A. Lap joint

B. Butt joint

C. Either (A) or (B)

D. Neither (A) nor (B)

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4

Plastics as a material of construction suffer from the drawback of low

A. Machinability

B. Density

C. Strength

D. Plastic deformation

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4

The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

A. 5

B. 15

C. 30

D. 45

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4

The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6)

A. 4.4

B. 5.6

C. 8.4

D. 2.4

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4

Pick out the wrong statement.

A. Molecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar

B. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise

C. Most of the hydrocarbons are non-polar

D. None of these

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4

Ceramic compounds as compared to metallic compounds

A. Crystallise faster

B. Resist greater tensile stress at room temperature

C. Have higher melting temperature

D. Are better conductor of electricity at higher temperature

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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

According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

A. 0.5

B. 2

C. √2

D. √3/2

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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

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4

Fire in fuel gas pipelines is extinguished most effectively by

A. Spraying water

B. Blanketting the area with nitrogen atmosphere

C. Fire fighting foam

D. None of these

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4

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m2. °K? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

A. 2

B. 8

C. 10

D. 40

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4

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. Spherical

B. Nodular

C. Irregular

D. No preferred shape

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4

__________ is used for tying the steel columns to concrete foundation.

A. Grouting

B. Eyebolt

C. Anchor bolts

D. Refractory castables

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4

One of the methods of purification of leach liquor is ion exchange, which involves

A. Exchange between two liquid phases

B. Exchange between a gaseous phase and a liquid phase

C. Exchange between a liquid phase and an organic resin phase

D. Exchange between a solid phase and a gas phase

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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

The ratio of the shear stress to the principal stress on a principal plane is

A. 0

B. 1

C. 1/2

D. 1/3

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4

Holes for riveting purposes should be preferably made by

A. Cutting torch

B. Drilling

C. Punching

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

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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4

Increase in the entropy of a system represents the

A. Degradation of energy

B. Decrease in system pressure

C. Increase in the availability of energy

D. Increase in the temperature

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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

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

A. Re0.5, Re0.8

B. Re0.8, Re-0.5

C. Re0.8, Re0.5

D. Re-0.8, Re0.5

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4

In an eutectic system, two elements are completely

A. Soluble in solid state

B. Insoluble in liquid state

C. Insoluble in both solid & liquid state

D. Soluble in liquid state

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4

A cylindrical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is

A. 0

B. 0.33

C. 0.44

D. 0.25

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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

The two elements required to form substitutional solid solution should not have

A. Same crystalline structure

B. Same valency

C. Widely differing electronegativity

D. Same atomic sizes