C PROGRAMMING QUIZ

Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

Induction motors

High frequency transformers

Generators and small motors

Armature of small motors/generators

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As the impurities are oxidised, the melting point of iron

Decreases

May increase or decrease ; unpredictable

Remains unchanged

Increases

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18/8 stainless steel means, that it contains

18% molybdenum and 8% chromium

18% chromium and 8% nickel

18% nickel and 8% chromium

18% chromium and 8% molybdenum

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Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making

Gears

Shafts

Flanges

Shear blades

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A material is able to retain the deformation permanently by virtue of its

Plasticity

Elasticity

Ductility

Malleability

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The fermentor used for the production of ethyl alcohol from molasses is made of

Wood

Procelain

Concrete

Copper bearing steel

TRUE ANSWER : ?
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Which of the following mechanical properties of a material is most structure insensitive?

Tensile strength

Modulus of elasticity (young

Toughness

Percentage reduction of area

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A measure of toughness of a material is its

Percentage elongation

Area under stress-strain diagram

Yield strength

Ultimate strength

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Addition of 2% nickel in steel makes it suitable for making

Boiler plates, rivets etc

Connecting rod

Electronic valves

Turbine blades

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Which of the following is the hardest?

Ferrite

Austenite

Pearlite

Cementite

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