ET I Lesson 1 Flashcards
to fuckin' learn, dumbass
Democritus provided concepts of what?
Atomic structures of matter
Who first recorded the rubbing of amber induces a state in which it would attract other light objects?
Thales of Miletus
Democritus’ fifth principle states that…
“Varieties of all things depend on the varieties of their atoms, in number, size, and aggregation”
What are some things that electromagnetic tests can do?
ID material and their discontinuities
Who observed that a wire connected to the ends of a battery affected a compass within vicinity?
Hans Christian Orsted
What the fuck did Michael Faraday discover?
When one coil was connected to a battery, there was another current running through a second nearby coil.
He concluded that second current ran in the opposite direction of the first current.
Who was able to explain the relationship between magnetism and electricity?
James Maxwell
Who first recorded the electromagnetic test that distinguished the different types of metal?
David Hughes
What is the definition of an electrical conductor?
Any material that is capable of carrying electrical current.
An alternating current flowing in a conductor will set up:
an alternating magnetic field around the conductor.
A hall effect sensor is a…
noncontact magnetic sensor
What type of current is typically employed in electromagnetic testing instruments?
Alternating Current
The first eddy current instrument was developed in:
1926
What effect does the presence of a discontinuity in the test object cause?
Redistribution of the normal eddy current flow.
The flow of eddy currents primarily depends on which of the following?
Physical and electrical characteristics of the test object.
Level IIl personnel are qualified to perform following tasks:
interpret and evaluate test results in terms of applicable codes, standards, specifications, and procedures.
Develop, qualify, and approve procedures; establish and approve NDT methods and techniques to be used by level 1 and 2 people
Train and examine level 1 and 2 people
Interpret and evaluate code
The direction of the magnetic field induced by an eddy current is:
Perpendicular
Which electromagnetic testing technique or NDT method involves the use of ferroprobes?
Magnetic flux leakage testing.
What do electromagnetic testing instruments typically measure and display?
Changes in coil impedance.
Electromagnetic techniques include…
Eddy current testing
Alternating current field measurement
Remote field testing
Level 1 Personnel are qualified to perform what tasks?
Perform specific tests in accordance to written instructions
Record test results
Perform NDT jobs with written instruction or under supervision of a level II or III
Level 2 personnel are qualified to perform what tasks?
Set up and standardize equipment
Interpret and evaluate results
organize and report results
Trainer of level 1 personnel
Be familiar of each method
Level 3 personnel are qualified to perform what tasks?
Develop, qualify, and approve procedures
Interpret and evaluate results
Establish acceptance criteria where there are none
Responsible for training and certifying level I and II personnel
