Endterm

Question 1

Electromagnetic induction and voltage transformation, its function is to provide current at high voltage to the x-ray tube

Answer 1

X-ray generator

Question 2

electrical power available in the hopsital or clinic provided up to?

Answer 2

480V

Question 3

Much __ than 20,000 to 150,000 needed for x-ray production

Answer 3

Lower

Question 4

__ are principle components of x-ray generators they convert low voltage to high voltage through a process called __

Answer 4

Transformers, electromagnetic induction

Question 5

Effect that occurs with changing magnetic field and alternating electrical current, a reciprocal between electric and magnetic field

Answer 5

Electromagnetic induction

Question 6

Performs task of transforming alternating input voltage to alternating output voltage using principle of electromagnetic induction

Answer 6

Transformers

Question 7

Input ac power (voltage and current) produced?

Answer 7

Oscillating electrical and magnetic field

Question 8

One insulated wire wrapping (primary winding) carries the__ other insulated wire wrapping (secondary winding) carries

Answer 8

Input load (primary voltage and current), induced output load (secondary voltage and current)

Question 9

Primary and secondary windings are electrically but not __ isolated by insulated wires

Answer 9

Magnetically

Question 10

Secondary windings are bathed in the?

Answer 10

Oscillating magnetic field

Question 11

Ns is?

Answer 11

Seconday coil

Question 12

Np is?

Answer 12

Primary coil

Question 13

Vs is

Answer 13

Alternating input

Question 14

Vp is?

Answer 14

Alternating output

Question 15

Ns > np

Answer 15

Step up transformer

Question 16

Ns<np

Answer 16

Step down transformer

Question 17

Ns=np

Answer 17

Isolation

Question 18

Is the ratio of energy production of expenditure per unit of time

Answer 18

Power

Question 19

__ unit of power is __

Answer 19

51, watt (W)

Question 20

The high-voltage section of an x-ray generator
contains a step-up transformer, typically with a
primary-to-secondary turns ratio of ?

Answer 20

1:500 to 1: 1,000.

Question 21

Within this range, a tube voltage of __ requires
an input peak voltage of __ to __, respectively.

Answer 21

100 kVp, 200V, 100V

Question 22

Is the electrical potential of earth. center tapping to ground does not affect the maximum voltage at any point in the circuit relative to the ground to 1/2 of peak voltage applied to the tube.

Answer 22

Ground potential

Question 23

Maximum voltage st any point in the circuit for a center-tapped transformer of?

Answer 23

150 kVp is -75 kVp or + 75 kVp

Question 24

Low kVp (__) used in mammography does not present a big electrical insulation problem

Answer 24

Less than 50 kVp

Question 25

Consist of a single coil wire wrapped around an iron core. It has fixed number of turns, two lines on the input side and two lines on the output side

Answer 25

Autotransformers

Question 26

Autotransformers operates on the principal of?

Answer 26

Self induction

Question 27

Standard transformer operates on the principle of?

Answer 27

Mutual induction

Question 28

Permits much larger increase/decrease in voltage and it electrically isolates primary from secondary circuits

Answer 28

Standard transformer

Question 29

Has a number of taps on input and output sided to permit small incremental increase/decrease in output voltage

Answer 29

Switching autotransformers

Question 30

X-ray tube provides an environment for x-ray production via?

Answer 30

Bremsstrahlung and characteristic radiation mechanism

Question 31

Major components of x-ray tube

Answer 31

Cathode, anode, rotor,stator, glass(metal envelope), and tube housing

Question 32

__ is the rate of electron flow from cathode to anode measured in __ where 1 mA = __

Answer 32

Tube current, milliamperes, 6.24X1015 electrons/sec

Question 33

__ is used to adjust kVp produced by xray generator

Answer 33

Switched autotransformers

Question 34

__ is provided to the input side of autotransformers and __ of the autotransformers is provided to the primary side of __

Answer 34

Standard alternating current, output voltage, high voltage transformer

Question 35

For continuous fluoroscopy the tube current is typically _ to _

Answer 35

1-5 mA

Question 36

For projection radiography tube currents from __ to __ mA are used with short exposure time (less than __msec)

Answer 36

100,1000, 100

Question 37

Three major selectable parameters on x-ray generator control panel that determine the x-ray beam characteristic (quality and quantity)

Answer 37

kVp, mA and exposure

Question 38

The sources of electron in the x-ray tube is the __ which is a helical filament of tungsten wire surrounded by a __

Answer 38

Cathode, focusing cup

Question 39

This structure is electrically connected to the __

Answer 39

Filament circuit

Question 40

The filament circuit provides a voltage up to __ to the filament, producing a current up to about __ through the filament.

Answer 40

10 V, 7 A

Question 41

Electrical resistance heats the filament and releases electrons via a process called?

Answer 41

Thermionic emission

Question 42

For diagnostic imaging, electrons from cathode filament are accelerated towards anode by a peak voltage ranging from __ to __ V (__ to__ kVp)

Answer 42

20,000 to 150,000 V (20 to 150 kVp)