ISRO Scientist or Engineer Mechanical 2016

Instructions

For the following questions answer them individually

Question 71

A wire has a mass ($$0.3 \pm 0.003$$) g, radius ($$0.5 \pm 0.005$$) mm and length ($$6 \pm 0.06$$) cm. The maximum percentage error in the measurementof density is

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Question 72

Match the items in column-1 and column-2 and choose the correct combination

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Question 73

Which ofthe following pressure gauge is generally used for the calibration of other pressure measuring gauges

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Question 74

In a ball bearing, if the number of balls is reduced to half and diameter of the ball is increased to 4 times, then static load capacity of the ball bearing is

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Question 75

The velocity of sound in winter compared to summer will be

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Question 76

Gaseous Nitrogen at $$30^\circ C$$ is expanded through a converging nozzle from a total pressure of 0.5 MPa to a back pressure chamber.If the back pressure is increased from 0.1 MPa to 0.4 MPa in steps of 0.02 MPa, the trend in massflow rate through the nozzle

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Question 77

What is the value of

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Question 78

Critical to Stagnation Pressure ratio $$\left(\frac{P^*}{P_0}\right)$$ for an expansion process is

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Question 79

Match the items in column-1 and column-2 and choose the correct combination

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Question 80

A Pelton wheel turbine operates under a head of 125 m at a speed of 2000 rpm. To operate very close to the maximumefficiency, the mean diameter of the Pelton wheelis nearly

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