ISRO Scientist or Engineer Mechanical 2009

Instructions

For the following questions answer them individually

Question 31

In the Van der Waal’s gas equation $$\left(p + \frac{a}{v^2}\right) (v - b) =RT$$ the constant ‘a’ is introduced to compensate for

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Question 32

The centrifugal tension in belts

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Question 33

In nodular iron, graphite is in the form of

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Question 34

Corrosion resistance of steel increases by addition of

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Question 35

Phenomenon of progressive extension of material with time at constant load is called

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Question 36

Rivets are made of

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Question 37

Addition of copper to aluminium results in

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Question 38

A Hooke’s joint is used to connect two

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Question 39

Ina hardness test, L is load in kg, D is diameter of ball in mm and d is diameter of indentation in mm. Brinell Hardness Numberis expressed by the equation

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Question 40

Circumferential and longitudinal strains in the cylindrical boiler under internal steam pressure are $$\epsilon_1 and \epsilon_2$$ respectively. Change in the volumeof the boiler cylinder per unit volumewill be

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