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Power Engineering - 2A2 (Chapter 5) Exam Questions And Answers 100% Pass
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Power Engineering - 2A2 (Chapter 5) Exam Questions And Answers 100% Pass What are the two main categories of material testing? - answerDestructive testing Non-destructive testing / Non-destructive examination (NDE) What are the four methods of destructive testing? - answerTensile Tests Hardnes...

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  • November 3, 2024
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  • 2024/2025
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  • power engineering 2a2 chapter 5 exam questions

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©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM


Power Engineering - 2A2 (Chapter 5) Exam
Questions And Answers 100% Pass


What are the two main categories of material testing? - answer✔Destructive testing


Non-destructive testing / Non-destructive examination (NDE)

What are the four methods of destructive testing? - answer✔Tensile Tests
Hardness Tests
Impact Tests
Proof Tests

In a tensile test, how is the shape of the specimen determined? - answer✔The shape is defined
by the standards established by ASTM

In a tensile test, why is the shape of the specimen important? - answer✔So that the beak
occurs in the "gauge length" section.

What is the mechanism called that is used for performing tensile tests? - answer✔An
extensometer

When performing tensile tests, what are the five stress points plotted? - answer✔Proportional
Limit
Yield stress
Proof Stress
Ultimate tensile Strength
Final instability point

, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM

What is the proportional limit as it pertains to tensile tests? - answer✔The stress point at which
slip (or glide) due to dislocation movement occurs.

What is yield stress as it pertains to tensile tests? - answer✔The stress at which yielding occurs
across the whole specimen.


At this point, deformation is purely plastic (non-reversible)

What is proof stress as it pertains to tensile tests? - answer✔The point at which a specimen has
undergone a certain value of permanent strain. Usually 0.2%

What is the ultimate tensile strength (UTS) as it pertains to tensile tests? - answer✔It is the
point at which plastic deformation becomes unstable and a narrow region (a neck) forms in the
specimen.

What is the final instability point as it pertains to tensile tests? - answer✔It is the failure point,
at which fracture occurs.

What are the two main types of strain? - answer✔Elastic strain
Plastic strain

Explain elastic strain - answer✔Elastic strain is the stretching of material within its elastic limit.
It will return to its original dimensions when the stress is removed.

Explain plastic strain - answer✔Plastic strain happens once the material has exceeded its elastic
limit. It is the irreversible deformation of a material.

What is engineering strain? - answer✔This is the one outlined in the academic supplement.


Strain=ΔL/Original L

What is true strain? - answer✔It is similar to engineering strain but based on the instantaneous
length of the specimen as the test progresses.


Instantaneous length
True Strain = ln --------------------------

, ©THEBRIGHT EXAM SOLUTIONS
10/30/2024 11:32 PM

Original length

What is the hardness measurement? - answer✔The resistance of a material to surface
indentation.

What are the four common hardness testing methods? - answer✔Brinell
Rockwell
Vickers
Knoop

Describe the Brinell Hardness Test. - answer✔Specimen placed on an anvil
Load applied through a plunger and ball
Held for 10 to 30 seconds
Diameter measured twice offset by 90° to get mean diameter
Hardness number calculated

What is the most widely used hardness test? Why? - answer✔The Rockwell hardness test


Because it's simple to perform

What do Rockwell hardness testers use as an indentor? - answer✔Either a diamond cone or ball
What are the letters that follow the numerical value for a Rockwell hardness test? What do
they mean? - answer✔1234 H R (B or C)


H = Hardness
R = Rockwell
B or C = Ball or Cone

Describe a Rockwell Hardness test. - answer✔A ball or diamond cone is pressed into a specimen
at two loads (light load and heavy load.) The difference in depth is given a numerical value as
indicated on a dial depth gauge.

What do Vickers Hardness testers use as an indentor? - answer✔Diamond pyramid

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