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Fluid Mechanics MCQ Questions & Answers | Chemical Engineering

Learn Fluid Mechanics MCQ questions & answers are available for a Chemical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Fluid Mechanics MCQ question is the important chapter for a Chemical Engineering and GATE students. Page-2 section-8

Each section contains 100 MCQs on Fluid Mechanics .
11
The head loss in turbulent flow in a pipe varies
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Answer & Solution
Answer: Option C
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12
A 2" gate valve fitted in a pipe is replaced by a similar globe valve. Pressure drop in gate valve was Δp. For the same discharge, the pressure drop across globe valve is
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Answer & Solution
Answer: Option C
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13
The fluid velocity varies as the cube of the cylinderical pipe diameter in case of steady state laminar flow at constant pressure drop for __________ fluid.
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Answer: Option B
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14
The __________ is measured by a piezometric opening.
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Answer & Solution
Answer: Option C
Solution:
The total pressure is measured by a piezometric opening. This pressure is the sum of the dynamic pressure and the static pressure in a fluid flow. The piezometric opening helps measure the total energy of the fluid, which includes both kinetic and potential energy. Therefore, in this context, the correct option is Option C: Total pressure
15
Multistage compressors are used in industry, because they
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Answer & Solution
Answer: Option C
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16
Vane anemometer
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Answer: Option C
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17
If three pipes of different diameters, lengths & friction factors are connected in parallel, then (where, Q = flow rate, V = fluid velocity f = friction factor).
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Answer: Option A
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18
Reynolds number for flow of water at room temperature through 2 cm dia pipe at an average velocity of 5 cm/sec is around
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Answer & Solution
Answer: Option D
Solution:
Reynolds number (Re) is a dimensionless quantity used in fluid mechanics to predict whether the flow will be laminar or turbulent.

It's calculated using this formula: Re = (Density * Velocity * Diameter) / Viscosity

For water at room temperature, we can use approximate values:
  Density (ρ) ≈ 1 g/cm³
  Viscosity (μ) ≈ 0.01 g/(cm·s)

Let's plug in the given values from the question:
  Diameter (D) = 2 cm
  Velocity (V) = 5 cm/s

Therefore:
  Re = (1 g/cm³ * 5 cm/s * 2 cm) / (0.01 g/(cm·s))
  Re = 1000

Therefore, the Reynolds number is approximately 1000. This indicates a flow that is likely to be in the transition zone between laminar and turbulent flow.
19
A double acting reciprocating pump compared to a single acting pump (of almost same size working under same pressure levels) would give almost double
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Answer & Solution
Answer: Option B
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20
Volute type of casing is provided in a centrifugal pump to
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Answer & Solution
Answer: Option A
Solution:
In a centrifugal pump, a volute type of casing is designed to gradually increase the area of the flow path as the fluid moves away from the impeller. This design helps in converting the velocity head to pressure head. As the fluid decelerates in the volute casing, its kinetic energy (velocity head) is converted into potential energy (pressure head). This process is crucial for increasing the pressure of the fluid being pumped, allowing for more efficient fluid transfer in various applications.