Resistive Transducers Questions and Answers

Q: Strain gauge is a/an :

A strain gauge is a passive device that converts mechanical displacement into a change of resistance.A strain gauge is a fine wire or foil grid bonded to a surface. When the surface is strained, the grid stretches or compresses, changing its length, cross-section and resistivity, and so its resistance; the gauge factor relates the fractional change in resistance to the strain.It is passive because it generates no energy of its own: an external excitation, usually a Wheatstone bridge, is needed to turn the resistance change into a voltage. The options calling it active describe a self-generating transducer such as a thermocouple or piezoelectric crystal, and 'electrical displacement' is not what it senses.

Q: The drawbacks of strain gauges are :S1 : Low fatigue lifeS2 : They are expensive, brittle and sensitive to temperatureS3 : Poor linearity

The official key is S2 and S3: the gauges are brittle and temperature sensitive, and they show poor linearity.These two points describe semiconductor strain gauges, which have a large gauge factor but whose resistance changes non-linearly with strain, drift with temperature and are brittle and hard to bond. Sources found for the search agree on brittleness, temperature sensitivity and non-linearity.What could not be confirmed: sources disagree on the cost of semiconductor gauges, which some call low and some high, and 'low fatigue life' (S1) was not found among the usual listed drawbacks. The key's S1-free answer, S2 and S3, is therefore kept; options containing S1 are rejected on that basis.

Strain gauge is a/an :

A.Active device and converts mechanical displacement into a change of resistance.
B.Passive device and converts electrical displacement into a change of resistance.
C.Passive device and converts mechanical displacement into a change of resistance.
D.Active device and converts electrical displacement into a change of resistance.

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: C

A strain gauge is a passive device that converts mechanical displacement into a change of resistance.

A strain gauge is a fine wire or foil grid bonded to a surface. When the surface is strained, the grid stretches or compresses, changing its length, cross-section and resistivity, and so its resistance; the gauge factor relates the fractional change in resistance to the strain.

It is passive because it generates no energy of its own: an external excitation, usually a Wheatstone bridge, is needed to turn the resistance change into a voltage. The options calling it active describe a self-generating transducer such as a thermocouple or piezoelectric crystal, and 'electrical displacement' is not what it senses.

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The drawbacks of strain gauges are :

S1 : Low fatigue life
S2 : They are expensive, brittle and sensitive to temperature
S3 : Poor linearity

A.S1 and S2
B.S2 and S3
C.S1 and S3
D.S1 only

Exam Year(s)

MH SET - 2018, SET Exam - 2018,

Answer: B

The official key is S2 and S3: the gauges are brittle and temperature sensitive, and they show poor linearity.

These two points describe semiconductor strain gauges, which have a large gauge factor but whose resistance changes non-linearly with strain, drift with temperature and are brittle and hard to bond. Sources found for the search agree on brittleness, temperature sensitivity and non-linearity.

What could not be confirmed: sources disagree on the cost of semiconductor gauges, which some call low and some high, and 'low fatigue life' (S1) was not found among the usual listed drawbacks. The key's S1-free answer, S2 and S3, is therefore kept; options containing S1 are rejected on that basis.

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