Stress-Strain Measurement and Strain Gauges Quiz

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What is a key advantage of mechanical strain gauges?

Utilizes optical levers for amplification

Suitable for dynamic measurements

High sensitivity to ambient conditions

Self-contained magnification system (correct)

Why are optical strain gauges unsuitable for measuring dynamic strain?

Require auxiliary equipment for operation

They have high sensitivity to temperature and humidity

Inability to accommodate different gauge lengths

Slow response due to high inertia (correct)

What is the main function of an extensometer in mechanical strain gauges?

To accommodate a wide range of gauge lengths

To measure strain under static or gradually varying loading conditions (correct)

To provide real-time data visualization

To sense and magnify change in length

How do optical strain gauges amplify the relative displacement between knife edges?

By rotating while undergoing displacement Signup and view all the answers

Why are electrical strain gauges not mentioned in the given text?

The text does not cover them under types of strain gauges Signup and view all the answers

What is the definition of strain?

The change in length of a line segment divided by the original length of the segment Signup and view all the answers

What is the usual practice for strain measurement with respect to gauge lengths?

To make measurements over the shortest possible gauge lengths Signup and view all the answers

What do strain gauges measure?

Dimensional change on the surface of the structural member under test Signup and view all the answers

Where are strain gauges mostly used to measure strains?

On the free surface of a body Signup and view all the answers

What do the equations suggest about determining strains at any point on the surface of a body?

If the two displacements u and v can be measured at all points on the surface, strains at any point can be determined Signup and view all the answers

What is the primary purpose of a strain gauge?

To indicate strain at only one point on a structural member Signup and view all the answers

What are the Cartesian strain components used to characterize the state of strain at any point on the free surface of a body?

\( ho_{xx}, ho_{yy}, \ heta_{xy} \) Signup and view all the answers

What do the given equations suggest about determining strains at any point on the surface of a body?

Strains can be determined by measuring the displacement components u and v at all points on the surface of a body Signup and view all the answers

What is the usual practice for strain measurement with respect to gauge lengths?

Strain measurement is usually done over shortest possible gauge lengths Signup and view all the answers

What is a key requirement for good strain gauges according to the text?

Capability to indicate static, transient, and dynamic strain Signup and view all the answers

What is a major disadvantage of mechanical strain gauges?

Unsuitable for dynamic measurements and varying strain Signup and view all the answers

Which type of strain gauge uses a combination of mechanical and optical levers for amplifying relative displacement?

Optical Strain Gauges Signup and view all the answers

What is the sensitivity of the Tuckerman optical gauge?

2 micro strain Signup and view all the answers

Why are electrical strain gauges not mentioned in the given text?

They are not commonly used in engineering applications Signup and view all the answers

What is the main advantage of optical strain gauges over mechanical strain gauges?

Suitable for dynamic measurements and varying strain Signup and view all the answers

Stress-Strain Measurement and Strain Gauges Quiz

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Questions and Answers

What is a key advantage of mechanical strain gauges?

Why are optical strain gauges unsuitable for measuring dynamic strain?

What is the main function of an extensometer in mechanical strain gauges?

How do optical strain gauges amplify the relative displacement between knife edges?

Why are electrical strain gauges not mentioned in the given text?

What is the definition of strain?

What is the usual practice for strain measurement with respect to gauge lengths?

What do strain gauges measure?

Where are strain gauges mostly used to measure strains?

What do the equations suggest about determining strains at any point on the surface of a body?

What is the primary purpose of a strain gauge?

What are the Cartesian strain components used to characterize the state of strain at any point on the free surface of a body?

What do the given equations suggest about determining strains at any point on the surface of a body?

What is the usual practice for strain measurement with respect to gauge lengths?

What is a key requirement for good strain gauges according to the text?

What is a major disadvantage of mechanical strain gauges?

Which type of strain gauge uses a combination of mechanical and optical levers for amplifying relative displacement?

What is the sensitivity of the Tuckerman optical gauge?

Why are electrical strain gauges not mentioned in the given text?

What is the main advantage of optical strain gauges over mechanical strain gauges?

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