Mechanical Energy Balance

Question 1
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Bernoulli equation is valid for which process?
Reversible
Irreversible
Reversible & Irreversible
None of the mentioned
Explanation:
Bernoulli equation is valid for the process in which loss of mechanical energy is zero, which is reversible.
Question 2
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The mechanical energy balance is the product of the equation of motion and which of the following?
Mass
Velocity
Volume
None of the mentioned
Explanation:
The mechanical energy balance is the product of the equation of motion and velocity.
Question 3
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What is the height difference of the water (density = 1000 Kg/m3), if the change in velocity is 10 m/s and change in pressure is 500 Pa?
1.01 m
5.05 m
10.1 m
20.2 m
Explanation:
∆h = (500/1000 + 102/2)/10 = 5.05 m.
Question 4
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What is the height difference of the water (density = 1000 Kg/m3), if the change in velocity is 6 m/s and change in pressure is 2000 Pa?
1.2
2.0
3.6
4.4
Explanation:
∆h = (2000/1000 + 62/2)/10 = 2.0 m.
Question 5
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Which of the following allows complete conversion of mechanical energy?
Frictionless process
Dissipative process
Mixing of components
All of the mentioned
Explanation:
A frictionless process is reversible so it allows complete conversion of mechanical energy.
Question 6
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What is the height difference of the water (density = 1000 Kg/m3), if the change in velocity is 10 m/s and change in pressure is 1000 Pa?
1.4 m
2.9 m
4.2 m
5.1 m
Explanation:
∆h = (1000/1000 + 102/2)/10 = 5.05 m.
Question 7
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What is the height difference of the water (density = 1000 Kg/m3), if the change in velocity is 2 m/s and change in pressure is 100 Pa?
0.21 m
0.42 m
0.56 m
0.84 m
Explanation:
∆h = (100/1000 + 22/2)/10 = 0.21 m.
Question 8
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Which of the following is not an example of mechanical energy?
Kinetic energy
Potential energy
Internal energy
Work
Explanation:
Internal energy is not a mechanical energy.
Question 9
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Which process allows complete conversion of mechanical energy?
Irreversible
Reversible
Reversible & Irreversible
None of the mentioned
Explanation:
Reversible process so it allows complete conversion of mechanical energy.
Question 10
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Mechanical energy satisfy which of the following?
Completely Convertible
Non-convertible
Partially convertible
None of the mentioned
Explanation:
Mechanical energy is completely convertible by an ideal engine.