Question:
In an air conditioned room, the velocity of air can be measured using which of the following instruments?
In an air conditioned room, the velocity of air can be measured using which of the following instruments?
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To measure air flow and velocity in ventilation systems, an anemometer is the standard tool. Hot-wire anemometers are particularly useful for low-velocity indoor measurements.
Updated On: Aug 7, 2026
- Hygrometer
- Anemometer
- Thermometer
- Tachometer
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Monitoring environmental parameters in air-conditioned spaces is crucial for maintaining human comfort and processing conditions in dairy plants.
These parameters include temperature, relative humidity, air purity, and air velocity.
Air velocity determines the rate of convective heat transfer from surfaces and must be measured using a highly sensitive flow-measuring instrument.
Step 2: Detailed Explanation:
An anemometer is an instrument designed specifically to measure the speed, velocity, and pressure of moving air currents.
In ventilation and air conditioning applications, various types of anemometers are used:
1. Vane anemometers utilize a small rotating propeller where the rotation speed is proportional to the air velocity.
2. Hot-wire anemometers utilize a thin heated wire; the rate of convective cooling of the wire by the air stream is calibrated to determine the velocity of the air.
Let us analyze the other instruments listed:
- A hygrometer (A) is used to measure the moisture content or relative humidity of the air.
- A thermometer (C) is used to measure the temperature of the air.
- A tachometer (D) is used to measure the rotational speed of shafts or gears, usually in revolutions per minute (RPM).
Therefore, the anemometer is the correct instrument for measuring air velocity.
Step 3: Final Answer
The instrument used to measure the velocity of air in an air-conditioned room is the anemometer.
Monitoring environmental parameters in air-conditioned spaces is crucial for maintaining human comfort and processing conditions in dairy plants.
These parameters include temperature, relative humidity, air purity, and air velocity.
Air velocity determines the rate of convective heat transfer from surfaces and must be measured using a highly sensitive flow-measuring instrument.
Step 2: Detailed Explanation:
An anemometer is an instrument designed specifically to measure the speed, velocity, and pressure of moving air currents.
In ventilation and air conditioning applications, various types of anemometers are used:
1. Vane anemometers utilize a small rotating propeller where the rotation speed is proportional to the air velocity.
2. Hot-wire anemometers utilize a thin heated wire; the rate of convective cooling of the wire by the air stream is calibrated to determine the velocity of the air.
Let us analyze the other instruments listed:
- A hygrometer (A) is used to measure the moisture content or relative humidity of the air.
- A thermometer (C) is used to measure the temperature of the air.
- A tachometer (D) is used to measure the rotational speed of shafts or gears, usually in revolutions per minute (RPM).
Therefore, the anemometer is the correct instrument for measuring air velocity.
Step 3: Final Answer
The instrument used to measure the velocity of air in an air-conditioned room is the anemometer.
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