ISRO Scientist or Engineer Mechanical 2018

Instructions

For the following questions answer them individually

Question 51

The degree of reaction in an axial flow compressor is defined as the ratio of static enthalpy rise in the

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Question 52

The frequency of ultrasonic waves is

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Question 53

Loudness of the sound does not change with the change in

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Question 54

The hydraulic diameter, $$D_h$$, of a rectangular channel with sides ‘a’ and ‘b’ is

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Question 55

Which of the following has maximum value of thermal conductivity?

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Question 56

The value of Biot number is very small (< 0.01) when

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Question 57

A steam pipe is to be insulated by 2 insulating materials put over each other. For best results

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Question 58

The main objective of ‘shot peening’ is to improve which property of metal parts

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Question 59

A hole is of dimension $$\phi 60^{\frac{+0.015}{-0.000}}$$ and the corresponding shaft is of dimension $$\phi 60^{\frac{+0.011}{-0.001}}$$. When they are assembled they will form a

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Question 60

Which of the following carbon steels is most weldable?

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