GATE Prev Year : Fluid Mechanics Test-8

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Question 1

A static fluid can have

• ANon-zero normal and shear stress
• BNegative normal stress and zero shear stress
• CPositive normal stress and zero shear stress
• DZero normal stress and non-zero shear stress

Question 2

For the stability of a floating body, under the influence of gravity alone, which of the following is TRUE?

• AMetacentre should be below centre of gravity
• BMetacentre should be above centre of gravity
• CMetacentre and centre of gravity must lie on the same horizontal line
• DMetacentre and centre of gravity must lie on the same vertical line

Question 3

For a compressible fluid, sonic velocity is

• Aa property of the fluid
• Balways given by where R and T are respectively the ratio of specifi heats, gas constant and temperature in K
• Calways given by where p, and s are respectively pressure, density and entropy.
• Dalways greater than the velocity of fluid at any location.

Question 4

In the manometer tube, if P_gas > P_atm indicates:

• AGas pressure = atmospheric pressure x h (height of the mercury)
• BGas pressure = atmospheric pressure - h (height of the mercury)
• CGas pressure = atmospheric pressure + h (height of the mercury)
• DGas pressure = atmospheric pressure / h (height of the mercury)

Question 5

Which is the correct equation of head loss in a pipe?

• Ah_{loss_single} =λ (l / d_h) (v² / 2 g) + Σ ξ v²/ 2 g
• Bh_{loss_single} = (l / d_h) (v² / 2 g) + Σ ξ v²/ 2 g
• Ch_{loss_single} =λ (d_h) (v² / 2 g) + Σ ξ v²/ 2 g
• Dh_{loss_single} =λ (l / d_h) (v² / g) + Σ ξ v²/ g

Question 6

In figure, if the pressure of gas in bulb A is 50 cm Hg vacuum and p_atm = 76 cm Hg, the height of column H is equal to

• A26 cm
• B50 cm
• C76 cm
• D126 cm

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