Question 1

How many heat units are produced with five consecutive exposures using a three-phase,12-pulse x-ray unit;85 kVp;and 20 mAs?

Accepted Answer

A)   1,700 HU
B)   2,295 HU
C)   2,397 HU
D)   11,985 HUE) A) and B)
F) A) and C)

Question 2

The target window is usually approximately:

Accepted Answer

A)   1 mm²
B)   5 mm²
C)   1 cm²
D)   5 cm²E) A) and B)
F) A) and C)

Question 3

The electrons in the tube current travel:

Accepted Answer

A)   at the speed of light
B)   approximately half the speed of light
C)   approximately one-fourth the speed of light
D)   none of the aboveE) B) and D)
F) A) and B)

Question 4

The portion of the induction motor that is outside the tube enclosure is the:

Accepted Answer

A)   rotor
B)   stator
C)   disc
D)   bearingsE) A) and D)
F) A) and C)

Question 5

Thermionic emission is:

Accepted Answer

A)   heating the filament
B)   heating the filament until electrons are boiled off
C)   using the focusing cup to create a space charge
D)   the space charge that travels from cathode to anodeE) A) and B)
F) B) and C)

Question 6

The advantage to using a small effective focal spot is:

Accepted Answer

A)   the image is sharper
B)   the image is less sharp
C)   less exposure can be used
D)   it is safer for the patientE) C) and D)
F) A) and B)

Question 7

For the covering of the rotating anode disc,_____________ may be added to tungsten to increase thermal capacity.

Accepted Answer

A)   molybdenum
B)   rhenium
C)   copper
D)   none of the aboveE) None of the above
F) A) and B)

Question 8

When the exposure switch at the operating console is first depressed:

Accepted Answer

A)   high voltage creates a large potential difference between the anode and cathode
B)   the anode starts rotating
C)   thermionic emission is achieved
D)   B and CE) None of the above
F) B) and C)

Question 9

Each cathode filament is approximately:

Accepted Answer

A)   1-3 mm long
B)   5-6 mm long
C)   7-15 mm long
D)   20-35 mm longE) None of the above
F) A) and C)

Question 10

The effective focal spot is the:

Accepted Answer

A)   same as the actual focal spot
B)   actual area where the electrons hit the target
C)   actual size of the origin of the x-ray beam
D)   size of origin of the x-ray beam as seen from below the tubeE) C) and D)
F) All of the above

Question 11

The area of the envelope where x-rays should exit the tube is the:

Accepted Answer

A)   door
B)   window
C)   trap
D)   gateE) B) and D)
F) None of the above

Question 12

The size of the actual focal spot depends on:

Accepted Answer

A)   the size of the anode
B)   the size of the cathode filament being used
C)   the size of the effective focal spot
D)   the size of the tubeE) B) and C)
F) A) and D)

Question 13

When the electrons strike the anode target,they all produce x-rays.

Accepted Answer

A) True 
 B)False

Question 14

Glass enclosures are typically made of borosilicate glass (Pyrex) because:

Accepted Answer

A)   it is an inexpensive material
B)   it is an expensive material
C)   it is very heat-resistant
D)   none of the aboveE) None of the above
F) A) and C)

Question 15

Electrons from the cathode that do not produce x-rays will:

Accepted Answer

A)   be absorbed in the envelope
B)   return to the cathode filament
C)   be absorbed in the air in the tube
D)   continue on through the circuitE) A) and B)
F) C) and D)

Question 16

Heat from x-ray production is removed through convection by the heat traveling from:

Accepted Answer

A)   the tube to the room by cooling fans
B)   the tube to heat tolerant materials
C)   the tube to the oil bath
D)   none of the aboveE) C) and D)
F) A) and B)

Question 17

Using Figure 5-11,A,in the textbook,75 kVp,600 mA,and 0.1 sec is:

Accepted Answer

A)   a safe exposure
B)   an unsafe exposure
C)   it is impossible to tellD) A) and B)
E) A) and C)

Question 18

Part of the useful x-ray beam gets absorbed in the anode when:

Accepted Answer

A)   the anode angle is too large
B)   the anode angle is too small
C)   the actual focal spot is too large
D)   the actual focal spot is too smallE) A) and D)
F) None of the above

Question 19

The space charge effect describes:

Accepted Answer

A)   how the space charge is created
B)   the effect the cloud of electrons has on the voltage across the tube
C)   the effect the cloud of electrons has on limiting additional electrons being emitted
D)   the effect of the heat of the filament on the size of the space chargeE) None of the above
F) B) and D)

Question 20

Tungsten is used to coat the anode disc because it:

Accepted Answer

A)   has a high melting point
B)   has a low melting point
C)   has a low atomic number
D)   does not conduct heat wellE) B) and C)
F) A) and B)

Exam 5: The X-Ray Tube

Tungsten is used to coat the anode disc because it:

Correct AnswerverifiedShow Answer

Using Figure 5-11,A,in the textbook,75 kVp,600 mA,and 0.1 sec is:

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Thermionic emission is:

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For the covering of the rotating anode disc,_____________ may be added to tungsten to increase thermal capacity.

Correct AnswerverifiedShow Answer

Part of the useful x-ray beam gets absorbed in the anode when:

Correct AnswerverifiedShow Answer

Heat from x-ray production is removed through convection by the heat traveling from:

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When the exposure switch at the operating console is first depressed:

Correct AnswerverifiedShow Answer

The space charge effect describes:

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Each cathode filament is approximately:

Correct AnswerverifiedShow Answer

Electrons from the cathode that do not produce x-rays will:

Correct AnswerverifiedShow Answer

The area of the envelope where x-rays should exit the tube is the:

Correct AnswerverifiedShow Answer

When the electrons strike the anode target,they all produce x-rays.

Correct AnswerverifiedShow Answer

The target window is usually approximately:

Correct AnswerverifiedShow Answer

The portion of the induction motor that is outside the tube enclosure is the:

Correct AnswerverifiedShow Answer

How many heat units are produced with five consecutive exposures using a three-phase,12-pulse x-ray unit;85 kVp;and 20 mAs?

Correct AnswerverifiedShow Answer

The effective focal spot is the:

Correct AnswerverifiedShow Answer

The size of the actual focal spot depends on:

Correct AnswerverifiedShow Answer

The electrons in the tube current travel:

Correct AnswerverifiedShow Answer

Glass enclosures are typically made of borosilicate glass (Pyrex) because:

Correct AnswerverifiedShow Answer

The advantage to using a small effective focal spot is:

Correct AnswerverifiedShow Answer

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