Strain Gauge MCQ – Multiple Choice Questions on Strain Gauge

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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

Correct answer: 1. Resistance

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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

Correct answer: 2. (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

Correct answer: 2. 250 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

Correct answer: 3. 100

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

Correct answer: 1. Wheatstone 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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