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4

Stress relaxation is the phenomenon

A. In which parts are not loaded

B. In which stress remains constant on increasing load

C. In which deformation tends to loosen the joint and produces a stress reduced

D. Stress reduces on increasing load

Correct Answer :

C. In which deformation tends to loosen the joint and produces a stress reduced


Related Questions

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Thermoplastic materials are those materials which

A. Are formed into shape under heat and pressure and results in a permanently hard product

B. Do not become hard with the application of heat and pressure and no chemical change occurs

C. Are flexible and can withstand considerable wear under suitable conditions

D. Are used as a friction lining for clutches and brakes

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4

Specify the sequence correctly

A. Grain growth, recrystallisation, stress relief

B. Stress relief, grain growth, recrystallisation

C. Stress relief, recrystallisation, grain growth

D. Grain growth, stress relief, recrystallisation

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Which of the following elements does not impart hardness to steel?

A. Copper

B. Chromium

C. Nickel

D. Silicon

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Aluminium bronze contains aluminium and copper in the ratio of

A. 50 : 50

B. 40 : 60

C. 60 : 40

D. 10 : 90

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The coke in the charge of blast furnace

A. Controls the grade of pig iron

B. Acts as an iron bearing mineral

C. Supplies heat to reduce ore and melt the iron

D. Forms a slag by combining with impurities

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The machinability of steel is improved by adding

A. Nickel

B. Chromium

C. Nickel and chromium

D. Sulphur, lead and phosphorus

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The addition of which of the following improves machining of copper?

A. Sulphur

B. Vanadium

C. Tin

D. Zinc

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Chromium when added to steel __________ the tensile strength.

A. Does not effect

B. Decreases

C. Increases

D. None of these

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Which of the following material has maximum ductility?

A. Mild steel

B. Copper

C. Nickel

D. Aluminium

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The blade of a power saw is made of

A. Boron steel

B. High speed steel

C. Stainless steel

D. Malleable cast iron

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Dislocations in materials refer to the following type of defect

A. Point defect

B. Line defect

C. Plane defect

D. Volumetric defect

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A steel containing 16 to 18% chromium and about 0.12% carbon is called

A. Ferritic stainless steel

B. Austenitic stainless steel

C. Martenistic stainless steel

D. Nickel steel

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The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

A. 770°C

B. 910°C

C. 1050°C

D. Below recrystallisation temperature

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Taps dies and drills contain carbon

A. Below 0.5 %

B. Below 1 %

C. Above 1 %

D. Above 2.2 %

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Hardness of steel depends on

A. Amount of carbon it contains

B. The shape and distribution of the carbides in iron

C. Method of fabrication

D. Contents of alloying elements

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1841 high speed steel contains

A. Vanadium 4%, chromium 18% and tungsten 1%

B. Vanadium 1%, chromium 4% and tungsten 18%

C. Vanadium 18%, chromium 1% and tungsten 4%

D. None of the above

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4

The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as

A. Hysteresis

B. Creep

C. Visco elasticity

D. Boeschinger effect

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Age-hardening is related with

A. Stainless steel

B. Gun metal

C. German silver

D. Duralumin

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The ability of a material to absorb energy in the plastic range is called

A. Resilience

B. Creep

C. Fatigue strength

D. Toughness

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Iron is

A. Paramagnetic

B. Ferromagnetic

C. Ferroelectric

D. Dielectric

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The hardness of steel primarily depends on

A. Percentage of carbon

B. Percentage of alloying elements

C. Heat treatment employed

D. Shape of carbides and their distribution in iron

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Admiralty gun metal contains

A. 63 to 67% nickel and 30% copper

B. 88% copper, 10% tin and rest zinc

C. Alloy of tin, lead and cadmium

D. Iron scrap and zinc

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4

An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

A. Chromium

B. Silicon

C. Manganese

D. Magnesium

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Malleability of a material can be defined as

A. Ability to undergo large permanent deformations in compression

B. Ability to recover its original form

C. Ability to undergo large permanent deformations in tension

D. All of the above

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Cast iron is characterised by minimum of following percentage of carbon

A. 0.2 %

B. 0.8 %

C. 1.3 %

D. 2 %

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Super conduction by metals is observed in the temperature range of

A. Below 10°K

B. Above 100°K

C. Around 0°C

D. Around 100°C

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The material in which the atoms are arranged chaotically, is called

A. Amorphous material

B. Mesomorphous material

C. Crystalline material

D. None of these

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If a refractory contains high content of silicon, it means refractory is

A. Acidic

B. Basic

C. Neutral

D. Brittle

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The brown smoke during the operation of a Bessemer converter indicates that the

A. Air is burning out silicon and manganese

B. Silicon and manganese has burnt and carbon has started oxidising

C. The converter must be titled to remove the contents of the converter

D. The brown smoke does not occur during the operation of a Bessemer converter

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An alloy of copper, tin and zinc is known as

A. Brass

B. Bronze

C. Gun metal

D. Muntz metal