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Hydraulics And Fluid Mechanics MCQ Questions & Answers | Mechanical Engineering

Learn Hydraulics And Fluid Mechanics MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Hydraulics And Fluid Mechanics MCQ question is the important chapter for a Mechanical Engineering and GATE students. Page-9 section-1

Each section contains 100 MCQs on Hydraulics and Fluid Mechanics in ME .
81
A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, $$\alpha $$ = Angle of contact of the liquid surface and $$\sigma $$ = Surface tension)
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
82
The viscosity of water is __________ than that of mercury.
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
83
The surface tension of mercury at normal temperature compared to that of water is
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
84
The specific speed from 160 to 500 r.p.m. of a centrifugal pump indicates that the pump is
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
85
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
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Answer & Solution
Answer: Option D
No explanation is given for this question. Let's Discuss on Board
86
In a centrifugal pump casing, the flow of water leaving the impeller, is
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board
87
A jet of water is striking at the centre of a curved vane moving with a uniform velocity in the direction of jet. For the maximum efficiency, the vane velocity is ________ of the jet velocity
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Answer & Solution
Answer: Option A
Solution:
The efficiency of a water turbine or vane is maximized when the vane velocity matches half of the jet velocity. This condition ensures that the maximum energy transfer occurs from the jet to the vane.

Let's analyze each option:

Option A: "One-half" - This is correct for achieving maximum efficiency. When the vane velocity is half of the jet velocity, it allows for optimal energy transfer from the jet to the vane.

Option B: "One-third" - This is incorrect. A vane velocity of one-third of the jet velocity does not maximize efficiency; it would result in lower energy transfer.

Option C: "Two-third" - This is incorrect. A vane velocity of two-thirds of the jet velocity is not optimal for maximum efficiency in energy transfer.

Option D: "Three-fourth" - This is incorrect. A vane velocity of three-fourths of the jet velocity is also not optimal for maximum efficiency.

Therefore, the correct answer is Option A: One-half.
88
Operation of McLeod gauge used for low pressure measurement is based on the principle of
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
89
The flow ratio of Francis turbine is defined as the ratio of the
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Answer & Solution
Answer: Option A
No explanation is given for this question. Let's Discuss on Board
90
The jet ratio is defined as the ratio of the
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Answer & Solution
Answer: Option C
No explanation is given for this question. Let's Discuss on Board