Mechanical Engineering - Hydraulic Machines

Exercise : Hydraulic Machines - Section 2
26.
By fitting an air vessel to the reciprocating pump, there is always a saving of work done and subsequently saving of power. This saving in case of a single acting reciprocating pump is
39.2%
48, 8%
84.8%
88.4%
Answer: Option
Explanation:
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27.
If the Francis turbine is run below 50 percent head for a long period, it will not only lose its efficiency but also the cavitation danger will become more serious.
Agree
Disagree
Answer: Option
Explanation:
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28.
The maximum hydraulic efficiency of an impulse turbine is (where φ = Angle of blade tip at outlet)
Answer: Option
Explanation:
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29.
In a Francis turbine runner, the number of blades are generally between
2 to 4
4 to 8
8 to l6
16 to 24
Answer: Option
Explanation:
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30.
The relation between hydraulic efficiency (ηh), mechanical efficiency (ηm) and overall efficiency (ηo) ) is
ηh = ηo x ηm
ηm = ηo x ηh
ηo = ηh x ηm
none of these
Answer: Option
Explanation:
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