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4

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

A. Grease

B. Solid lubricant

C. Animal oils

D. Mineral oils

Correct Answer :

B. Solid lubricant


Related Questions

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4

The refractory lining of the bottom in a basic electric arc furnace is made of

A. Silica

B. Alumina

C. Magnesia

D. Fireclay

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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

Which of the following properties of a solid is not dependent on crystal imperfection?

A. Ductility

B. Semi-conductivity

C. Melting point

D. Yield stress

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4

On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is

A. Creep

B. Toughness

C. Tensile strength

D. Fatigue

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4

LVDT used for displacement measurement is a/an __________ transducer.

A. Passive

B. Active

C. Capacitive

D. None of these

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4

Wrought iron is never shaped by

A. Casting

B. Cold working

C. Forging

D. Welding

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4

Which of the following can be manufactured using powder metallurgy techniques?

A. Brake linings

B. Bearings

C. Carbide tool tips

D. All 'a', 'b' and 'c'

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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

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

Which of the following is an unconventional source of energy?

A. Thermal power

B. Hydroelectric power

C. Nuclear-fusion power

D. Solar power

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4

With increase in temperature, the surface tension of water

A. Increases

B. Decreases

C. Remain constant

D. Increases linearly

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4

Ultimate strength in tension as compared to that in shear for steel is

A. Half

B. One third

C. One and half times

D. One fourth

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4

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

A. Steel

B. Glass wood

C. Copper

D. Fireclay bricks

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4

A pycnometer is used for the measurement of

A. Flow rate of molten metal

B. Specific gravity of a liquid

C. Composition of alloys

D. Concentration of a solution

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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

A jig is used while __________ a hole.

A. Boring

B. Counter boring

C. Drilling

D. Enlarging

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4

Silicon crystal can be converted to p-type semiconductor by doping with

A. Phosphorous

B. Nitrogen

C. Carbon

D. Boron

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4

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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4

__________ is the most important element, which controls the physical properties of steel.

A. Manganese

B. Silicon

C. Carbon

D. Vanadium

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4

Limestone addition in the blast furnace is done to flux __________ present in the raw materials.

A. SiO2

B. Al2O3

C. MnO2

D. P

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4

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3) while the C.V. is same on weight basis (i.e., kcal/kg)?

A. Propane and acetylene

B. Propane and LPG

C. Sewage gas and gobar gas

D. B.F gas and coke oven gas

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4

The refrigerant freon-12 is chemically

A. CCl2F2

B. CCl3F

C. CClF3

D. CCl4F

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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

__________ stress cannot be sustained by a fluid in equilibrium.

A. Shear

B. Tensile

C. Compressive

D. None of these

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4

Which of the following is not categorised as the ore agglomeration process?

A. Nodulising

B. Pelletising

C. Balling

D. Briquetting

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4

Stellite is a __________ material.

A. Ferrous

B. Ceramic

C. Cemented carbide

D. Non-ferrous cast alloy cutting tool

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4

Wrought iron does not have

A. Uniform strength in all directions

B. Ability to hold protective coating

C. High ductility & corrosion resistance

D. Easily weldable characteristics

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4

__________ remains constant during the adiabatic cooling of moist air.

A. Wet bulb temperature

B. Dry bulb temperature

C. Relative humidity

D. Specific humidity

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4

Secondary hardening in steels arises out of the

A. Precipitation of fine alloy carbides at high temperatures

B. Refinement of ferrite grain size by working

C. Decomposition of retained austenite upon heat treatment

D. Precipitation of complex inter-metallic upon heat treatment

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4

Spheroidising of a material is a/an __________ process.

A. Normalising

B. Annealing

C. Tempering

D. Hardening