Chemical Engineering
GATE CH Fluid Mechanics and Mechanical Operations PYQs
Build your understanding with focused practice from past exam papers.
How to practice Fluid Mechanics and Mechanical Operations
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 77. Imported answers require independent review unless marked reviewed.
Question 11
Open questionCHMCQ1 markNeeds review
Which one of the following is NOT a type of chain conveyor?
Your answerChoose one option.
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Open questionCHMCQ1 markNeeds review
Which one of the following ratios does a Gashof number represent?
Your answerChoose one option.
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Open questionCHMSQ1 markNeeds review
In which of the following condition(s), Bernoulli’s equation is applicable?
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 30
Open questionCHNAT1 markNeeds review
Consider two successive screen sizes in the Tyler standard screen scale, viz. 150 meshes per inch and 200 meshes per inch. Their linear sizes of the openings are L₁₅₀ and L₂₀₀, respectively. If the value of L₂₀₀ is 2.9 × 10⁻³ inch, then the value of L₁₅₀ (in inch) is ____ × 10⁻³ (rounded off to one decimal place).
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Open questionCHNAT1 markNeeds review
Water is discharged from vertical side of a tank through a circular orifice of diameter 2 cm under laminar flow conditions. The water surface in the tank is maintained at constant level above the center of the orifice. If the fluid jet has a diameter of 1.6 cm at its vena contracta, then the coefficient of contraction is _____________ (rounded off to two decimal places).
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Open questionCHMCQ2 marksNeeds review
Consider a flow with the following velocity field
where
,
and
are the unit vectors in the x, y and z directions, respectively. Which one of the following is CORRECT?Your answerChoose one option.
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Open questionCHMCQ2 marksNeeds review
The gross energy requirement, to reduce a very large feed of coal to such a size that 80% of the product passes through a 100
m screen, is 13 kWh per ton of feed. In a process, 250 ton h
of coal is crushed. The feed size is such that 80% of the feed passes through an opening of 100 mm. The product size range is to be such that 80% of the product passes through an opening of 25 mm. According to Bond’s law, which one of the following is the power consumption (in kW)?Your answerChoose one option.
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Open questionCHMCQ2 marksNeeds review
Laboratory filtration is conducted at constant pressure drop of 200 kPa on a slurry of CaCO
in water at room temperature. The time taken to collect filtrate is shown in the table.Filtrate volume collected (in m ) | Time (in s) |
|---|---|
| 40 |
| 100 |
The filter area is 0.05 m
and viscosity of filtrate is
Pa s. Which one of the following is the filter medium resistance (in m
)?Your answerChoose one option.
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Open questionCHNAT2 marksNeeds review
When a cylindrical capillary glass tube, open at both ends, is vertically inserted in a pool of water, the water level in the tube rises to 7 cm relative to the water level outside the tube. Consider that the surface tension of water is 0.07 N m⁻¹ and that the contact angle of water on glass is 0°. The density of water is 1000 kg m⁻³, and the local acceleration due to gravity is 10 m s⁻². The diameter of the capillary tube (in μm) is __________ (rounded off to the nearest integer).
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Open questionCHNAT2 marksNeeds review
Consider a two-dimensional, steady, laminar flow of an incompressible fluid with zero pressure gradient, over a thin horizontal flat plate of length 2 m. The free stream velocity is 1 m s⁻¹. A boundary layer thickness of 1 mm is observed at a distance of 0.25 m from the leading edge of the plate. At 1 m from the leading edge, the boundary layer thickness (in mm) is ________ (rounded off to the nearest integer).
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