# Strain Gauge MCQ – Multiple Choice Questions on Strain Gauge

Multiple choice questions on Strain Gauge

A Strain gauge also sometimes referred to as a Strain gage is a type of sensor whose resistance varies with applied force.

Strain Gauge MCQ

## Which parameter of a strain gauge varies with applied force

The ___________ of a strain gauge varies with applied force:

1. Resistance
2. Capacitanace
3. Inductance
4. Flux

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## Strain gauges can be used to pickup

Strain gauges can be used to pickup:

1. Expansion
2. Contraction
3. Both of these
4. None of these

Correct answer: 3. Both of these

## The bonding element in a strain gauge must posses

The bonding element in a strain gauge must posses:

1. Zero insulation resistance
2. Low insulation resistance
3. High insulation resistance
4. Any of the above

Correct answer: 3. High insulation resistance

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## The formula for gauge factor is

The formula for gauge factor is:

1. ΔR * RG * ε
2. (ΔR/RG)/ ε
3. (ΔR/RG)*ε
4. (ΔR + RG)/ ε

where

• ΔR is the change in resistance caused by strain
• RG is the resistance of the undeformed gauge
• ε is strain

## Unequal impedance of the four gauge arms can be best compensated by

Unequal impedance of the four gauge arms can be best compensated by:

1. Adding a parallel resistor to one or more of the gauge arms
2. Removing half the gauges
3. Increasing length of gauge arms
4. None of the above

Correct answer: 1. Adding a parallel resistor to one or more of the gauge arms

## 1 milliamp source current in 250 Ω gage corresponds to a power dissipation of

1 milliamp source current in 250 Ω gage corresponds to a power dissipation of:

1. 1 mW
2. 250 mW
3. 500 mW
4. 1000 mW

## Working principle of Strain Gauge

If L1 is the original length of a certain wire and L2 is the new length after an external force is applied, then the strain is mathemically written as:

1. ε = (L2+L1)/L1
2. ε = (L2-L1)/L1
3. ε = (L2-L1)/L2
4. ε = (L2-L1)/L2

Correct answer: 2. ε = (L2-L1)/L1

## Gauge factor of thick film resistors is

Gauge factor of thick film resistors is:

1. 1
2. 10
3. 100
4. 1000

## To detect very small changes in resistance strain gauges are configured with

To detect very small changes in resistance strain gauges are configured with:

1. Wheatstone bridge
2. Maxwell’s Bridge
3. Hay’s Bridge
4. Anderson Bridge

To detect very small changes in resistance strain gauges are configured with Wheatstone bridges.

## Practical application of Strain Gauge

Which of the following is a practical application of Strain Gauge:

1. Cables of civil bridges
2. Railway Engineering
3. Aerospace Engineering
4. All of these

Correct answer: 4. All of these

Given below are practical application of Strain Gauges.

• Bridges are often installed with a gauge that detects wind speed and its strain on bridge cables
• In railways, a strain gauge is employed for measuring strain on rails. In case of required maintenance, they can signal a warning
• A strain bridge finds a large number of applications in aerospace engineering. It is used to measure stresses on wings as well it is used in different configurations with onboard electronics.

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