DHT11 Sensor

DHT11 is ... sensor.

• Proximity sensor

• Touch sensor

• Humidity sensor

• Pressure sensor

Answer explanation

Explanation: We can read data from any sensor and analyse it graphically from anywhere in the world. Here, we can read temperature and humidity data from DHT11 sensor and upload it to a Think speak cloud using Arduino Uno.

What is ESP8266?

• Sensor

• USB cable

• Board

• WIFI module

Answer explanation

Explanation: ESP8266 is a WIFI module, which is serial. And also it is small, cheap, and easy to use.

What is humidity sensor?

• Hygrometer

• Sundial

• Gyroscope

• Sesimoscope

Answer explanation

Explanation: A hygrometer is an instrument used for measuring the water vapor in the atmosphere. Humidity measurement instruments usually rely on measurements of some quantity such as temperature, pressure, mass or a mechanical or electrical change.

Units for Humidity sensor ... .

• Dew/fost point or Relative Humidity

• Relative Humidity or Parts Per Million

• Dew/fost point or Parts Per Million or Relative Humidity

• Dew/fost point or Parts Per Million

Answer explanation

Explanation: Most commonly units for humidity measurement are Relative Humidity(RH), DEW/Fost point (D/F PT) and Parts Per Million(PPM). RH is a function of temperature. DEW/Fost point is a function of the pressure of the as but is independent of temperature and is therefore defined as absolute humidity measurement of temperature. PPM is also an absolute measurement.

Dew point and Fost point are mainly used in which conditions?

• Water vapor

• Dryness of gas

• Moisture in gas

• Pressure of gas

Answer explanation

Explanation: Dew point and Fost point are often used when the dryness of the gas is important. Dew point is also used as an indicator of water vapor in high temperature processes, such as industrial drying.

Units for Absolute Humidity is ... .

• grams/m³

• % by volume

• PPMV

• %

Answer explanation

Explanation: Absolute Humidity is defined as ratio of mass (vapor) to volume and has units of grams/m³.

Units for Due point is ... .

• PPMV

• % by volume

• gram/m³

• ^oC

Answer explanation

Explanation: Dew point is defined as temperature at which the water vapor in a gas condenses to liquid water and has a units of ^oC.

Humidity sensors are divided into how many types and depending on what?

• 2 types depending on output

• 2 types depending on measurement units

• 3 types depending on measurement units

• 3 types depending on output

Answer explanation

Explanation: According to the measurement units, humidity sensors are divided into two types: Relative Humidity(RH), and Absolute Humidity(moisture) sensors. Most humidity sensors are relative humidity sensors and use different sensing principles.

Electronic type hygrometers are divided into how many types?

• 5 types

• 3 types

• 4 types

• 2 types

Answer explanation

Explanation: Electronic type hygrometers or humidity sensors can broadly divided into two categories: one employs capacitive sensing principle, while other use resistive effects.

Relative humidity is a function of ... .

• Ambient temperature

• Water vapor pressure

• Dryness

• Ambient temperature and Water vapor pressure

Answer explanation

Explanation: Relative humidity is a function of both ambient temperature and water vapor pressure. Therefore there is a relationship between relative humidity, the amount of moisture present in the sensor, and sensor capacitance. This relation governs the operation of a capacitive humidity instrument.