RADT 1085 Final Test with Correct Answers
What are materials called that are strongly attracted to a magnet? - Answer-Ferromagnetic
What are materials called that are NOT attracted to a magnet? - Answer-Non-magnetic
What are materials called that are weakly attracted to a magnet? - An...
RADT 1085 Final Test with
Correct Answers
What are materials called that are strongly attracted to a magnet? - Answer-
Ferromagnetic
What are materials called that are NOT attracted to a magnet? - Answer-Non-magnetic
What are materials called that are weakly attracted to a magnet? - Answer-
Paramagnetic
How are the north poles of two magnets going to affect each other? - Answer-They will
repel
Materials that are easily magnetized and demagnetized are said to have a high _____. -
Answer-Permeability
How will the north pole and south pole of two magnets affect each other? - Answer-
They will attract
Which of the following happens when a wire moves through a magnetic field?
1. An electromotive force is induced in the wire
2. The resistance in the wire increases
3. The magnetic field disappears - Answer-1 only
Maximum induction will occur when a conductor cuts a magnetic field at what angle? -
Answer-90 degrees
Materials that are difficult to magnetize and demagnetize are said to have a high _____.
- Answer-Retentivity
A coil of wire rotating through a magnetic field produces an electric current. What does
this describe? - Answer-Generator
How can voltage be induced into a conductor?
1. Move a wire through a magnetic field
2. Move a magnetic field across a wire
3. Place a wire in a varying magnetic field - Answer-1, 2 & 3
, A _____ works by sending an alternating current through a coil of wire athat has been
placed within a magnetic field. - Answer-Motor
What is it called when a current is induced in a secondary coil by simply alternating the
current in the primary coil? - Answer-Mutual induction
What type of transformer has more turns of wire in the secondary side than in the
primary side? - Answer-Step-up
What type of transformer core is most widely used in radiographic equipment? -
Answer-Shell type
What determines the transformer ratio? - Answer-Turns of wire
Which type of transformer core is most efficient? - Answer-shell type
If the voltage is stepped-up, what happens to the current in the secondary side of the
transformer? - Answer-Decreases
As magnetic domins rearrange in a transformer, heat is produced. What is this energy
loss called? - Answer-Hysteresis losses
Which of the following materials would make the best transformer core? - Answer-Soft
iron
The changing of alternating current to direct current is known as what? - Answer-
Rectification
What is the name of the closed path over which electric current flows? - Answer-Circuit
What is a device called that allows current to flow in only one direction? - Answer-
Conductor
Which type of rectification will supply the x-ray tube with the greatest power? - Answer-
Full-wave
What is the voltage supplied to the autotransformer called? - Answer-Line voltage
What controls the incoming voltage to the autotransformer? - Answer-Main breaker
switch
Which of the following is the most accurate timer? - Answer-Electronic timer
Tapping windings of the autotransformer to supply voltage to the step-up transformer is
the purpose of which of these? - Answer-kVp selector
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