Civil Engineering
GATE CE Fluid Mechanics PYQs
Build your understanding with focused practice from past exam papers.
How to practice Fluid Mechanics
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–10 of 49. Imported answers require independent review unless marked reviewed.
Question 16
Open questionCEMCQ1 markNeeds review
Two reservoirs having different water levels are connected by two long parallel pipelines of same length and same material but having diameters of 600 mm and 400 mm. Using Darcy-Weisbach equation, the ratio of flowrate of water in the bigger diameter pipe to that in the smaller diameter pipe is
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 41
Open questionCEMCQ2 marksNeeds review
In a laminar flow of a Newtonian fluid through a circular pipe of radius 5 cm, the maximum velocity is found to be 2 m/s. The velocity (in m/s) at a radial distance of 2.50 cm from the axis of the pipe is
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 53
Open questionCENAT2 marksNeeds review
The cross section of a 0.5 m wide vertical gate holding water and oil is shown in the figure. The unit weights of water and oil are 10 kN/m³ and 7.5 kN/m³, respectively.
The horizontal hydrostatic force (in kN) acting on the vertical gate is ______ (rounded off to two decimal places).
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 54
Open questionCENAT2 marksNeeds review
A centrifugal pump is delivering water from an underground tank to an overhead reservoir against a static head of 35 m through a 2 km long, 250 mm diameter pipe. The head-discharge characteristic of the pump is given by
where H is the head (in m) generated by the pump and Q is the discharge (in m³/s) of the pump.
Neglecting all minor losses, the head (in m) generated by the pump is ______ (rounded off to the nearest integer).
Use: Darcy-Weisbach friction factor f = 0.04
Acceleration due to gravity = 9.81 m/s²
π = 3.14Log in to check the answer
You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 19
Open questionCEMCQ1 markNeeds review
For a flowing fluid, a dimensionless combination of velocity (
), length scale (
), and acceleration due to gravity (
) would beYour answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 30
Open questionCEMSQ1 markNeeds review
For the Bernoulli’s equation to be applicable in a fluid flow situation, which of the following conditions is/are to be satisfied:
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 33
Open questionCENAT1 markNeeds review
Consider steady flow of water in the series pipe system shown below, with specified discharge. The diameters of Pipes A and B are 2 m and 1 m, respectively. The lengths of pipes A and B are 100 m and 200 m, respectively. Assume the Darcy-Weisbach friction coefficient, f as 0.01 for both the pipes.
The ratio of head loss in Pipe-B to the head loss in Pipe-A is _____ (round off to the nearest integer).
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Open questionCEMSQ2 marksNeeds review
The drag force,
on a sphere due to a fluid flow past the sphere is a function of viscosity,
, the mass density,
, the velocity of flow,
, and the diameter of the sphere,
.Pick the relevant (one or more) non-dimensional parameter(s) pertaining to the above process from the following list.
Your answerSelect all correct options. You can choose more than one.
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Open questionCENAT2 marksNeeds review
The shaft of a 6 m wide gate in the figure will fail at a moment of 3924 kN.m about the hinge P. The maximum value of water depth h (in m) that the gate can hold is ______________ (round off to the nearest integer).
Note:
Density of water = 1000 kg/m
Acceleration due to gravity = 9.81 m/s
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Open questionCE2MCQ1 markNeeds review
The following figure shows a plot between shear stress and velocity gradient for materials/fluids P, Q, R, S, and T. Which one of the following options is CORRECT?
Your answerChoose one option.
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