Daily review: Pressure Sensor Quiz Practice Quiz…

Q: Which physical phenomenon is most commonly utilized in MEMS-based piezoresistive pressure sensors?

Change in electrical resistance due to mechanical strain — Piezoresistive sensors detect pressure via the change in resistance of a material subjected to mechanical strain.

Q: In a capacitive pressure sensor, what is the primary variable that changes when pressure is applied to the diaphragm?

The distance between the plates — Capacitance C = ?A/d. When pressure deflects the diaphragm, the distance 'd' between the plates changes.

Q: What does a 'Gauge Pressure' sensor measure pressure relative to?

Current atmospheric pressure — Gauge pressure is measured relative to the ambient atmospheric pressure.

Q: Which bridge circuit is standardly used to convert small resistance changes in a piezoresistive sensor into a voltage output?

Wheatstone Bridge — The Wheatstone bridge is ideal for measuring tiny resistance variations with high precision.

Q: What is the primary advantage of a piezoelectric pressure sensor compared to a piezoresistive one?

Excellent dynamic response for measuring fast transients — Piezoelectric sensors are ideal for high-frequency, dynamic pressure measurements but cannot measure static pressure.

Q: An absolute pressure sensor is sealed and references its measurement against what?

A perfect vacuum — Absolute pressure sensors reference the measurement against a vacuum, making them independent of altitude/atmospheric changes.

Q: What is the main purpose of an instrumentation amplifier in a pressure sensor signal conditioning circuit?

To amplify small differential signals while rejecting common-mode noise — Instrumentation amps provide high gain and high CMRR, crucial for reading low-level sensor bridge outputs.

Q: Which of the following is a common error source in pressure sensors that is often compensated for using an integrated thermistor?

Temperature drift — Resistance values in sensors are temperature-dependent; temperature drift compensation is vital for accuracy.

Q: What describes the ability of a pressure sensor to return to the same output reading when the same pressure is applied multiple times in the same direction?

Repeatability — Repeatability is the measure of consistency in output given the same input conditions over time.

Q: In the context of pressure sensors, what does the term 'Span' refer to?

The algebraic difference between the upper and lower range values — Span is the full range of the sensor's measurement capability (Max Range - Min Range).

Question 1 of 10

Which physical phenomenon is most commonly utilized in MEMS-based piezoresistive pressure sensors?

Piezoresistive sensors detect pressure via the change in resistance of a material subjected to mechanical strain.

Question 2 of 10

In a capacitive pressure sensor, what is the primary variable that changes when pressure is applied to the diaphragm?

Capacitance C = ?A/d. When pressure deflects the diaphragm, the distance 'd' between the plates changes.

Question 3 of 10

What does a 'Gauge Pressure' sensor measure pressure relative to?

Gauge pressure is measured relative to the ambient atmospheric pressure.

Question 4 of 10

Which bridge circuit is standardly used to convert small resistance changes in a piezoresistive sensor into a voltage output?

The Wheatstone bridge is ideal for measuring tiny resistance variations with high precision.

Question 5 of 10

What is the primary advantage of a piezoelectric pressure sensor compared to a piezoresistive one?

Piezoelectric sensors are ideal for high-frequency, dynamic pressure measurements but cannot measure static pressure.

Question 6 of 10

An absolute pressure sensor is sealed and references its measurement against what?

Absolute pressure sensors reference the measurement against a vacuum, making them independent of altitude/atmospheric changes.

Question 7 of 10

What is the main purpose of an instrumentation amplifier in a pressure sensor signal conditioning circuit?

Instrumentation amps provide high gain and high CMRR, crucial for reading low-level sensor bridge outputs.

Question 8 of 10

Which of the following is a common error source in pressure sensors that is often compensated for using an integrated thermistor?

Resistance values in sensors are temperature-dependent; temperature drift compensation is vital for accuracy.

Question 9 of 10

What describes the ability of a pressure sensor to return to the same output reading when the same pressure is applied multiple times in the same direction?

Repeatability is the measure of consistency in output given the same input conditions over time.

Question 10 of 10

In the context of pressure sensors, what does the term 'Span' refer to?

Span is the full range of the sensor's measurement capability (Max Range - Min Range).

Daily review: Pressure Sensor Quiz