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The speed of the air emerging from the blades of a running table fan is intended to be measured as a function of time. The point of measurement is very close to the blade and the time period of the speed fluctuation is four times the time taken by the blade to complete onerevolution. The appropriate method of measurement would involve the use of  
  • a)
    A Pitot tube
  • b)
    A hot wire anemometer
  • c)
    High speed photography
  • d)
    A Schlieren system
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The speed of the air emerging from the blades of a running table fan i...
Ans. (b) A Pitot tube is used for measuring speed in closed duct or pipe. Hot wire
anemometer is used for measuring fluctuation of speed. High speed photography may by useful to measure blade speed but not of air. 
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The speed of the air emerging from the blades of a running table fan i...

Measurement of Air Speed from Table Fan Blades

Hot wire anemometer

Using a hot wire anemometer would be the appropriate method for measuring the speed of the air emerging from the blades of a running table fan. Here's why:

  • High Sensitivity: Hot wire anemometers are highly sensitive instruments that can accurately measure the speed of airflow with precision.
  • Real-time Measurement: They provide real-time measurements of air velocity, allowing for the capture of speed fluctuations over time.
  • Non-intrusive: Hot wire anemometers are non-intrusive, meaning they do not disturb the airflow being measured, making them suitable for close proximity measurements to the fan blades.
  • High Time Resolution: They offer high time resolution, enabling the capture of rapid fluctuations in air speed, such as those occurring at a frequency four times the blade revolution time.


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Community Answer
The speed of the air emerging from the blades of a running table fan i...
Ahot wire anemometer
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The speed of the air emerging from the blades of a running table fan is intended to be measured as a function of time. The point of measurement is very close to the blade and the time period of the speed fluctuation is four times the time taken by the blade to complete onerevolution. The appropriate method of measurement would involve the use ofa)A Pitot tubeb)A hot wire anemometerc)High speed photographyd)A Schlieren systemCorrect answer is option 'B'. Can you explain this answer?
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The speed of the air emerging from the blades of a running table fan is intended to be measured as a function of time. The point of measurement is very close to the blade and the time period of the speed fluctuation is four times the time taken by the blade to complete onerevolution. The appropriate method of measurement would involve the use ofa)A Pitot tubeb)A hot wire anemometerc)High speed photographyd)A Schlieren systemCorrect answer is option 'B'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about The speed of the air emerging from the blades of a running table fan is intended to be measured as a function of time. The point of measurement is very close to the blade and the time period of the speed fluctuation is four times the time taken by the blade to complete onerevolution. The appropriate method of measurement would involve the use ofa)A Pitot tubeb)A hot wire anemometerc)High speed photographyd)A Schlieren systemCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The speed of the air emerging from the blades of a running table fan is intended to be measured as a function of time. The point of measurement is very close to the blade and the time period of the speed fluctuation is four times the time taken by the blade to complete onerevolution. The appropriate method of measurement would involve the use ofa)A Pitot tubeb)A hot wire anemometerc)High speed photographyd)A Schlieren systemCorrect answer is option 'B'. Can you explain this answer?.
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