Humidity Measurement MCQs and Answers: Following Multiple Choice Questions (MCQs) are based on “Humidity Measurement”. It is related to subject Instrumentation or Industrial Measurement.
This topic is mostly beneficial in the field of Instrumentation, Electronics, Electrical and Chemical Engineering.
These MCQs will be useful in various competitive examinations, entrance examinations, oral examination (Viva voce), certifications and interviews.
MCQ on Humidity Measurement
Que.1 Humidity is simply the amount of ______held in the air.
- water
- water vapor
- oxygen
- liquid
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Option 2: water vapor
Que.2 As the temperature of the air increases less water vapor can be held.
- True
- False
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Option 2: False
Explanation: As the temperature of the air increases more water vapor can be held. Because the movement of molecules at higher temperatures prevents condensation from occurring.Que.3 Which of the following is measurement of humidity?
- Relative
- Absolute
- Specific
- All of the above.
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Option 4: All of the above.
Que.4 ____ is a measure of the actual amount of water vapor in the air, regardless of the air’s temperature.
- Relative humidity
- Absolute humidity
- Specific humidity
- None of the above
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Option 2: Absolute humidity
Que.5 Units for Absolute Humidity is ________.
- %
- grams/m3
- % by volume
- PPMV
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Option 2: grams/m3
Que.6 _____ is a measure of the amount of water vapor that air is holding compared the amount it can hold at a specific temperature.
- Relative humidity
- Absolute humidity
- Specific humidity
- None of the above
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Option 1: Relative humidity
Explanation: A relative humidity of 30% means the air holds on that day (specific temperature) holds 30% of water needed for the air to be saturated.Que.7 Identify the correct statement from the following.
- Saturated air has an absolute humidity of 100%.
- The higher the amount of water vapor, the higher the absolute humidity.
- Absolute humidity is expressed in percentage.
- Warm air possesses less water vapor (moisture) than cold air.
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Option 2: The higher the amount of water vapor, the higher the absolute humidity.
Explanation:Saturated air has an relative humidity of 100%.
Relative humidity is expressed in percentage.
Warm air possesses more water vapor (moisture) than cold air.
Que.8 A device to measure humidity is called a
- hygrometer
- hydrometer
- flow meter
- None of the above
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Option 1: hygrometer
Que.9 A sling psychrometer consists of two thermometers. One thermometer is ordinary. The other has a cloth wick over its bulb and is called a
- dry-bulb thermometer
- covered thermometer
- wet-bulb thermometer
- black-bulb thermometer
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Option 3: wet-bulb thermometer
Que.10 At 100% relative humidity no water will evaporate from the wet bulb and the readings on both thermometers (ordinary and wet-bulb) will be ____.
- maximum
- the same
- minimum
- zero
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Option 2: the same
Que.11 Due point occurs when a mass of air has relative humidity of
- 50%
- 75%
- 90%
- 100%
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Option 4: 100%
Que.12 Which sensors measure the moisture level using humidity?
- Capacitive Sensor
- Resistive Sensor
- Thermal Conductivity
- Both resistive and conductive
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Option 1: Capacitive Sensor
Que.13 Consider the following statements about a sling psychrometer.
i. The dry bulb thermometer in psychrometer measures the actual air temperature.
ii. The wet bulb thermometer measures the relative humidity.
- Only statement (i) is correct.
- Only statement (ii) is correct.
- Both statements are correct.
- Both statements are wrong.
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Option 1: Only statement (i) is correct.
Explanation:The wet bulb thermometer can not measures the relative humidity.
A psychrometer also called a sling psychrometer has two thermometers attached.
One is dry (often called the dry bulb thermometer) and measures the actual air temperature.
The other called the wet bulb thermometer has a has a wet cloth at the tip.
As water molecules evaporate from the surface of the wet bulb they will take heat with them. Hence lowering the reading on the wet-bulb thermometer. The rate of evaporation depends on the amount of water vapor in the air.
Comparing the two temperatures in a chart will give the relative humidity.
