X-Ray Tube

Question 1

When the anode fails to rotate properly and the electron bombardment is restricted to a very small area of the target, the results will be anode:

Answer 1

Pitting

Question 2

The chief cause of X-Ray tube damage is:

Answer 2

Overheating

Question 3

How much of the energy generated in the tube is converted to X-Ray?

Answer 3

Less than 1%. 99% is converted to heat

Question 4

Heat units generated in the X-Ray tube may be calculated as:

Answer 4

Ma x time x KVP

Question 5

During phase II of the exposure:

Answer 5

The voltage applied gives a positive charge to the anode

Question 6

The filament wire is made of:

Answer 6

Tungsten, a metallic element that has a high melting point

Question 7

The glass envelope is surrounded by oil which:

Answer 7

Provides electrical insulation and absorbs heat radiated by the anode

Question 8

The size of the focal spot is determined by:

Answer 8

The size of the filament and the angle of the anode disc

Question 9

The boiling off of electrons at the filament is called:

Answer 9

Thermionic emission

Question 10

The major advantage of using the small focal spot is:

Answer 10

A sharper radiographic image

Question 11

What device permits expansions of the oil as its temperature increases in the tube housing?

Answer 11

Bellows