Does the MQ2 Gas Sensor have a fixed sensitivity?

Consider a measuring system consisting of a sensor, an amplifier and an oscilloscope. The sensitivity of each equipment is as follows : Sensor sensitivity : 0.4 mV/°C, Amplifier gain : 5.0 V/mV, and Oscilloscope sensitivity : 10 mV/V. What is the sensitivity of complete measurement system ?

A

5.0 V/mV

B

10 mV/V

C

15.4 mV/°C

D

20 mV/°C

If the PPM concentration of a gas that is being detected by the MQ2 Gas Sensor increases what will happen to its Digital Output pin?

A

Voltage Increases

B

Voltage Decreases

C

Voltage becomes 0

D

Voltage doesn’t change

If the PPM concentration of a gas that is being detected by the MQ2 Gas Sensor increases what will happen to its Analog Output pin?

A

Voltage Increases

B

Voltage Decreases

C

Voltage becomes 0

D

Voltage doesn’t change

How many terminals does the MQ2 Gas Sensor have?

A

1

B

3

C

2

D

4

Statement (I): To use a sensor, we generally need to add signal conditioning circuitry, such as circuits which amplify and convert from analog to digital, to get the sensor signal in the right form, take account of any non-linearities, and calibrate it. Statement (II): A smart sensor is integrated with the required buffering and conditioning circuitry in a single element and provides functions beyond that of just a sensor.

A

Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)

B

Both Statement (I) and Statement (II) are individually true but Statement (II) is not the correct explanation of Statement (I)

C

Statement (I) is true but Statement (II) is false

D

Statement (I) is false but Statement (II) is true

What is the use of the MQ2 Gas Sensor?

A

Object Identification

B

To provide 3G Connectivity

C

To measure presence of gas

D

To measure Wi-Fi strength

What will happen if we supply a voltage of 25V to the Vcc of the MQ2 Gas Sensor?

A

Damage is caused

B

Module will shut down

C

Module will not respond for the time the voltage is applied

D

Module will function normally

What is the maximum output voltage that the MQ2 Gas Sensor can put out on its analog output pin?

A

1V

B

140V

C

5V

D

10V

Can the MQ2 Gas Sensor differentiate between two different gases with the same PPM?

A

Yes

B

No

What is the name of the mesh surrounding the MQ2 Gas Sensor?

A

Anti-Heat Mesh

B

Anti-Explosion Mesh

C

Anti-Air Mesh

D

Filtration Mesh

Does the MQ2 Gas Sensor have a fixed sensitivity?

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