Question 1

The filament of an x-ray tube is made of:

Accepted Answer

A)   glass.
B)   a coil of copper wire.
C)   a coil of tungsten wire.
D)   a fluorescent tube.

Question 2

Most x-ray tubes in use today have a standard rotation speed of ______ rpm.

Accepted Answer

A)   1,500
B)   2,000
C)   3,600
D)   10,000

Question 3

If an exposure time is measured as 35 milliseconds,what is the exposure time in seconds?

Accepted Answer

A)   0.350 seconds
B)   350 seconds
C)   0.035 seconds
D)   3.5 seconds

Question 4

Filtration ______ the average wavelength of the x-ray beam.

Accepted Answer

A)   increases
B)   decreases
C)   does not affect
D)   has no relation to

Question 5

A smaller effective focal spot produces:

Accepted Answer

A)   greater tube heat capacity.
B)   lower patient dose.
C)   more characteristic radiation.
D)   greater image sharpness.

Question 6

The penetrating power of the x-ray beam is controlled by varying the:

Accepted Answer

A)   anode angle.
B)   anode speed.
C)   milliamperage.
D)   kilovoltage.

Question 7

The precise area on the target where the x-rays strike is called the:

Accepted Answer

A)   focal track.
B)   focal spot.
C)   actual focal spot.
D)   effective focal spot.

Question 8

An x-ray exposure is made using the following factors: 400 mA,0.02 sec,80 kVp,40 inches SID,and the large focal spot. What is the mAs for this exposure technique?

Accepted Answer

A)   0.08 mAs
B)   0.8 mAs
C)   8 mAs
D)   80 mAs

Question 9

The purpose of rotating the x-ray tube target is to:

Accepted Answer

A)   create a space charge.
B)   speed up the electrons in the electron stream.
C)   remove long wavelength photons from the x-ray beam.
D)   increase the heat capacity of the anode.

Question 10

A steeper target angle provides:

Accepted Answer

A)   more heat capacity.
B)   lower patient dose.
C)   less anode heel effect.
D)   smaller effective focal spot.

Question 11

The mAs used for an exposure determines the:

Accepted Answer

A)   wavelength of the resulting x-ray beam.
B)   quantity of radiation in the exposure.
C)   rate at which x-rays are produced.
D)   voltage across the x-ray tube.

Question 12

When tungsten atoms are heated,their outermost electrons are moved out of the atom in space. This principle is called:

Accepted Answer

A)   electromagnetic induction.
B)   variable resistance.
C)   quantum theory.
D)   thermionic emission.

Question 13

When exposure time is very short,the time is usually measured in:

Accepted Answer

A)   milliseconds.
B)   deciseconds.
C)   kiloelectron volts.
D)   angstroms.

Question 14

More than 99% of the energy applied to an x-ray tube is converted into:

Accepted Answer

A)   bremsstrahlung radiation.
B)   characteristic radiation.
C)   secondary radiation.
D)   heat.

Question 15

The anode,or target,of the x-ray tube is ______ charged.

Accepted Answer

A)   positively
B)   negatively
C)   neutrally
D)   radioactively

Question 16

What percentage of the total energy applied to an x-ray tube target is converted into x-rays?

Accepted Answer

A)   1%
B)   50%
C)   75%
D)   99%

Question 17

The difference in x-ray intensity (or volume of x-rays) between the anode and the cathode side of the x-ray beam is:

Accepted Answer

A)   45%.
B)   60%.
C)   75%.
D)   80%.

Question 18

Which of the following would be considered added filtration in the x-ray tube?

Accepted Answer

A)   Oil
B)   Pyrex glass
C)   Aluminum
D)   Tungsten

Question 19

What is the principal advantage of a high-speed rotating anode?

Accepted Answer

A)   More efficient production of x-rays
B)   Increased amount of characteristic radiation produced
C)   Increased amount of bremsstrahlung radiation produced
D)   More efficient heat dissipation

Question 20

The "electron cloud" that surrounds the hot cathode is referred to as a:

Accepted Answer

A)   focusing cup.
B)   photon.
C)   filament.
D)   space charge.

Exam 5: X-Ray Production

The "electron cloud" that surrounds the hot cathode is referred to as a:

Correct AnswerverifiedShow Answer

Filtration ______ the average wavelength of the x-ray beam.

Correct AnswerverifiedShow Answer

When exposure time is very short,the time is usually measured in:

Correct AnswerverifiedShow Answer

What percentage of the total energy applied to an x-ray tube target is converted into x-rays?

Correct AnswerverifiedShow Answer

Most x-ray tubes in use today have a standard rotation speed of ______ rpm.

Correct AnswerverifiedShow Answer

When tungsten atoms are heated,their outermost electrons are moved out of the atom in space. This principle is called:

Correct AnswerverifiedShow Answer

More than 99% of the energy applied to an x-ray tube is converted into:

Correct AnswerverifiedShow Answer

Which of the following would be considered added filtration in the x-ray tube?

Correct AnswerverifiedShow Answer

A steeper target angle provides:

Correct AnswerverifiedShow Answer

What is the principal advantage of a high-speed rotating anode?

Correct AnswerverifiedShow Answer

The filament of an x-ray tube is made of:

Correct AnswerverifiedShow Answer

If an exposure time is measured as 35 milliseconds,what is the exposure time in seconds?

Correct AnswerverifiedShow Answer

The anode,or target,of the x-ray tube is ______ charged.

Correct AnswerverifiedShow Answer

The precise area on the target where the x-rays strike is called the:

Correct AnswerverifiedShow Answer

The mAs used for an exposure determines the:

Correct AnswerverifiedShow Answer

The penetrating power of the x-ray beam is controlled by varying the:

Correct AnswerverifiedShow Answer

The purpose of rotating the x-ray tube target is to:

Correct AnswerverifiedShow Answer

An x-ray exposure is made using the following factors: 400 mA,0.02 sec,80 kVp,40 inches SID,and the large focal spot. What is the mAs for this exposure technique?

Correct AnswerverifiedShow Answer

The difference in x-ray intensity (or volume of x-rays) between the anode and the cathode side of the x-ray beam is:

Correct AnswerverifiedShow Answer

A smaller effective focal spot produces:

Correct AnswerverifiedShow Answer

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