ISRO Scientist or Engineer Mechanical 2007

Instructions

For the following questions answer them individually

Question 21

A centrifugal pump with peripheral speed ā€˜Vā€™ was selected fora total lift of 100 m. Actually pump wasto be operated fora total lift of 400 m. The peripheral speed should actually be (other conditions remaining same)

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Question 22

The specific speed of pump and turbine respectively are given as

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Question 23

Match List I with List II and select the correct answer

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Question 24

Given that
$$\alpha_1$$ = nozzle angle
n = number of rows of moving blades, in a velocity compounded impulse turbine, the optimum blade speedratio is

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Question 25

The following terms relate to floating bodies:
Centre of gravity ... G, MetaCentre ... M, Weight of floating body ... W, Buoyant force ... Fg, Match List I with List II and select the correct answer

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Question 26

A pipeline connecting two reservoirs has its diameter reduced by 20% due to deposition of chemicals. For a given head difference in the reservoirs with unaltered friction factor, this would cause a reduction in discharge of

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Question 27

An open rectangular box of base 2m $$\times$$ 2m contains a liquid of specific gravity 0.80 up to a height of 2.5 m. If the box is imparted vertically upward acceleration of 4.9m/s$$^2$$, what will be the pressure on the base of the tank?

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Question 28

The tank shown in the figure below is closed at top and contains air at a pressure of $$P_A$$. The value of $$P_A$$, for the manometer readings shown will be

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Question 29

$$P = 2i - 3j, Q = -3i + 4j - 2k$$, and R are in equilibrium, if R is

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Question 30

A rigid body is rotating with constant angular velocity $$\omega$$ about a fixed axis, if v is the velocity of a point of the body, then curl v =

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