RRB/SSC JE Mech: Engg. Fluid Mechanics Quiz 5

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Question 1

A pitot-static tube, with a coefficient of 0.98 is used to measure the velocity of water in a pipe. The stagnation pressure recorded is 4 m and static pressure is 1 m. What is the velocity of flow?

• A7.5
• B8.5
• C9.5
• D10.5

Question 2

A 25 cm diameter, 90 ° elbow has one limb vertical. Average velocity of flow of water through the elbow is 5 m/s and the pressure intensity is 5 kPa. The vertical component of force to keep the elbow in position will be

• A2.48 kN
• B3.48 kN
• C0.48 kN
• D1.48 kN

Question 3

A vertical air stream flowing at a velocity of 100 m/s supports a ball of 60 mm in diameter. Taking the density of air as 1.2 and kinematic viscosity as 1.6 strokes, the weight of the ball that is supported is (If coefficient of drag )

• A20.2 N
• B13.5 N
• C30.1 N
• D25.2 N

Question 4

The velocity distribution for flow over a flat plate is given by U = (3/4)y-y² in which u is the velocity in m/s at a distance y meter above the plate. If the dynamic velocity of the fluid is 10 poise, then the shear stress at 0.2 m is

• A0.45
• B0.35
• C0.55
• D0.25

Question 5

Which of the following flow is rotational where u and v are velocity components in x and y directions respectively

• A
• B
• CBoth (A) and (B)
• DNone of the above

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