RAD 230 - Week 2

What are the three methods of electrification?

• Induction

• Diffusion

• Contact

• Friction

• Excitation

If you run a comb through your hair, electrons are removed from the hair and deposited on the comb. The comb becomes electrified with too many negative charges. An electrified comb can pick up tiny pieces of paper as though the comb were a magnet. This is an example of ________________.

• induction

• electric ground

• static electricity

• potential

Electrostatic charge is measured in:

• Amperes

• Joules

• Coulombs

• Electron volts

Which of the following is true?

• A neutron will repel a neutron.

• A proton will repel a neutron.

• An electron will repel a neutron.

• An electron will attract an electron.

• An electron will repel an electron.

Answer explanation

No particle will repel a neutron because neutrons are electrically neutral. Remember, the principal electrostatic law states that like charges will repel each other, unlike charges will attract. Electrons will attract protons, but repel electrons.

What causes electrification?

• An excess of neutrons

• An excess of protons

• Transfer of electrons

• Transfer of neutrons

• Transfer of protons

Increasing atomic number :

• will decrease the energy of characteristic x-rays

• does not affect the energy of characteristic x-rays

• increases the energy of characteristic x-rays

• results in radiolucent areas on x-ray imaging

What is unique about the autotransformer?

• It has 2 coils - one on the primary side and one on the secondary side

• It is a single coil of wire

• It changes AC to DC

• It adjusts the incoming voltage to exactly 220V

Answer explanation

A transformer with 2 coils is a step-up or step-down transformer.

The autotransformer is a single coil of wire.

Rectifiers change AC to DC.

Incoming voltage is adjusted to 220V by the line compensator.

Where is the kVp meter?

• Connected to the autotransformer

• Connected to the anode on the secondary side of the x-ray circuit

• Connected to the step-up transformer

• Connected to the step down transformer

Answer explanation

The kVp meter is connected directly to the autotransformer on the primary side.

The x-ray tube has 2 electrodes: an anode and a cathode. Therefore, an x-ray tube is a(n):

• electrode

• diode

• cathode

• anode

• ode to joy

Answer explanation

The x-ray tube - because it has a cathode and anode (2 electrodes) - it is a diode.

True or false: The cathode is one of two electrodes in the x-ray tube diode.

• True

• False