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Mechanical Engineering Exam  >  Mechanical Engineering Tests  >  Test: Pressure At a Point in Compressible Fluid - Mechanical Engineering MCQ

Test: Pressure At a Point in Compressible Fluid - Mechanical Engineering MCQ


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10 Questions MCQ Test - Test: Pressure At a Point in Compressible Fluid

Test: Pressure At a Point in Compressible Fluid for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Test: Pressure At a Point in Compressible Fluid questions and answers have been prepared according to the Mechanical Engineering exam syllabus.The Test: Pressure At a Point in Compressible Fluid MCQs are made for Mechanical Engineering 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Pressure At a Point in Compressible Fluid below.
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Test: Pressure At a Point in Compressible Fluid - Question 1
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If the atmospheric pressure at sea level is 7.5 N/cm2, determine the pressure at a height of 3000m assuming the pressure variation follows isothermal law. The density of air is given as 1.2 km/m3. 

Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 1

Explanation: pressure at any height Z = p*e-gZ/RT
=75000*e -9.81*3000*1.2/75000 
= 4.68 N/cm2.

Test: Pressure At a Point in Compressible Fluid - Question 2
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The barometric pressure at sea level is 760 mm of Mercury while that on a mountain top is 715 mm. If the density of air is assumed constant at 1.2 kg/m3 , what is the elevation of the mountain top? 

Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 2

Explanation: Gauge pressure at any height h = pressure at sea level – pressure at that height
h=(9.81*13600*0.76)-9.81*13600*0.715)/1.2*9.81
=510 m.

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Test: Pressure At a Point in Compressible Fluid - Question 3
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Calculate the pressure at a height of 6500m above the sea level if the atmospheric pressure is 10.145 N/cm2 and temperature is 25℃ assuming air is incompressible. Take density of air as 1.2 kg/m3. Neglect variation of g. 

Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 3

Explanation: Pressure= p – density of air*g*height
=101450-9.81*1.2*6500
= 2.49 N/cm2.

Test: Pressure At a Point in Compressible Fluid - Question 4
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Calculate the pressure of air at a height of 3500m from sea level where pressure and temperature of air are 10 N/cm2 and 25℃ respectively. The temperature lapse rate is given as 0.0065 ℃ /m. Take density of air at sea level equal to 1.2 kg/m3. 
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 4

Explanation: pressure=p * (1-(k-1/k)*g*h*density/p)k/(k-1)
=9.85 N/cm2

Here, Lapse rate= -g/R*(k/k-1).

Test: Pressure At a Point in Compressible Fluid - Question 5
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Pressure variation for compressible fluid is maximum for which kind of process?
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 5

Explanation: Due to constant temperature, pressure variation for compressible fluid is maximum for isothermal process.

Test: Pressure At a Point in Compressible Fluid - Question 6
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Why can’t the density be assumed as constant for compressible fluids?
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 6

Explanation: Volume and hence density changes with change in temperature and pressure.

Test: Pressure At a Point in Compressible Fluid - Question 7
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What is the variation observed in temperature in atmosphere with respect to elevation?
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 7

Explanation: It goes on decreasing first and shows increase after 32000 m.

Test: Pressure At a Point in Compressible Fluid - Question 8
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As we go upwards, at height there is slight decrease in pressure variation.
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 8

Explanation: There is slight decrease in pressure as value of g (acceleration due to gravity) decreases slightly as we go higher.

Test: Pressure At a Point in Compressible Fluid - Question 9
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For dynamic fluid motion in a pipe, the pressure measurement cannot be carried out accurately by manometer.
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 9

Explanation: For fluid moving with variable velocity, fluctuation in pressure is frequent and more in magnitude. Hence, we cannot use manometer.

Test: Pressure At a Point in Compressible Fluid - Question 10
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A simple U tube manometer connected to a pipe in which liquid is flowing with uniform speed will give which kind of pressure?
Detailed Solution for Test: Pressure At a Point in Compressible Fluid - Question 10

Explanation: A simple U tube manometer will give pressure with respect to atmosphere. Hence, it is gauge pressure.

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