ISRO Scientist or Engineer Mechanical 2009

Instructions

For the following questions answer them individually

Question 1

A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a mass of 1000kg. The force required on plunger is nearly equal to

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Question 2

If the stream function is given by $$\psi = 3xy,$$ then the velocity at a point (2,3) will be

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Question 3

The correct sequence of the centrifugal pump components through which the fluid flows is

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Question 4

The relation $$pV^\gamma$$ = constant, where $$\gamma$$ is the ratio of the specific heats of ideal gas, is applicable to

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Question 5

Across a normal shock

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Question 6

A necessary precaution in selection of pumps for parallel operations is that

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Question 7

A metallic cube of side 10 cm, density 6.8 gm/cc is floating in liquid mercury (density 13.6gm/cc), with 5 cm height of cube exposed above the mercury level. Water (density 1 gm/cc) is filled over this, to submerge the cube fully. The new height of cube exposed above mercury level is

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Question 8

The pressure drop for a relatively low Reynolds number flow in a 600 mm, 30 m long pipeline is 70kPa. Whatis the wall shear stress?

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Question 9

The radiative heat transfer rate per unit area (W/m2) between two plane parallel grey surfaces (emissivily 0.9) maintained at 400 K and 300 K is (Stefan Bottzman constant $$\sigma = 5.67 \times 10^6 W/m^2 K^4$$)

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Question 10

At the eye tip of a centrifugal impeller, blade velocity is 200 m/s while the uniform axial velocity at the inlet is 150 m/s. If the sonic velocity is 300 m/s, then the inlet Mach number of the flow will be

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