The Secondary circuit

Question 1

The secondary circuit consists of (4)

Answer 1

1. secondary side of the step-up transformer
2. mA/s meter
3. rectifiers
4. x-ray tube

Question 2

monitors the x-ray tube current

Answer 2

mA/s meter

Question 3

it is connected to the center of the secondary winding of the step-down transformer

Answer 3

mA/s meter

Question 4

converts AC to DC ensuring that electrons flow in only one direction- from cathode to anode.

Answer 4

rectifiers

Question 5

diodes used for x-ray machine are solid-state diodes made of silicon.

Answer 5

rectifiers

Question 6

x-ray machines can be ___rectified or ___ rectified.

Answer 6

half-wave; full-wave

Question 7

Used for portable x-ray, machines and dental x-ray machines

Answer 7

half-wave rectification

Question 8

• can be made of 0(self-rectified), 1or 2 diodes
• x-ray output pulsates! producing 50 or 60 x-ray pulses each second

Answer 8

half-wave rectification

Question 9

• inefficient because it wastes half of the supply of power.
  -also require twice the exposure time

Answer 9

half-wave rectification

Question 10

• used for most permanent radiographic unit
• usually made of four diodes
• the pulsed output occurs 120 times each second

Answer 10

full wave rectification

Question 11

• more efficient than half-wave rectified unit because the negative half cycle of input voltage is converted to positive cycle

Answer 11

full-wave rectification

Question 12

time of exposure is also cut in half in comparison to half-wave rectified unit

Answer 12

full-wave rectification

Question 13

7 voltage waveforms

Answer 13

-single-phase voltage waveform
-single-phase half wave rectified voltage wave form
- single-phase full wave rectified voltage waveform
- three-phase voltage waveform
- three-phase six-pulse voltage waveform (full-wave rectified)
- three-phase 12 pulse voltage waveform
- high-frequency voltage waveform (constant potential)

Question 14

voltage wave form with positive and negative cycle. voltage is pulsating and swings from zero to maximum potential

Answer 14

single-phase voltage waveform

Question 15

The negative half cycle of the waveform is suppressed

Answer 15

single-phase half-wave rectified voltage waveform

Question 16

voltage wave form where in the negative half cycle is converted to positive cycle by Rectifiers voltage is still pulsating.

Answer 16

single-phase full-wave rectified voltage waveform

Question 17

this voltage wave form is composed of three simultaneous voltage waveforms that are out of step with one another. with three face voltage waveform, voltage no longer drops to zero

Answer 17

three-phase voltage waveform

Question 18

In this voltage wave form, a nearly constant high voltage is supplied to the x-ray tube

Answer 18

three-phase six-pulse voltage waveform (full-wave rectified)

Question 19

additional component is added to further improve the number of pulses in a cycle

Answer 19

three-phase 12 pulse voltage waveform

Question 20

in this voltage wave form the usual frequency (50 or 60 Hz) is converted to high frequency (500 to 25,000 Hz) before converting the high voltage. This produces nearly constant potential voltage waveform improving image quality at lower patient dose.

Answer 20

high-frequency voltage waveform (constant potential)

Question 21

is part of the high-voltage circuit this circuit is completed once the electrons produced on the filament travel from cathode to anode. however, the reverse is not possible as anode cannot produce electrons.

Answer 21

x-ray tube