# 133 lecture test 2 starting lesson 8-9

## 60 terms

### High Frequency

What type of generator is generally used in x-rays this day in age.

### Pulse

everytime voltage drops to zero we consider it a what?

### Higher, lower

with three phase rectified power, we have to use____mAs, and ____ time.

### direct current

High frequency generators generally look close to what?

### Voltage Ripple

Small fluctuations in voltage from peak to peak in a cycle is called:

### 100% ripple

Single phase half wave has this amount of ripple

### 100%

Single Phase full wave has this amount of ripple

### 14%

3 phase full wave 6 pulse has this amount of ripple

### 4%

3 phase full wave 6 pulse has this amount of ripple

### 1%

high-frequency has this amount of ripple

### Power

The rate at which energy is used to accomplish work is:

### Power

Current x Potential

### Amp

1 watt is equal to one ___ of current flowing through an electric potential of 1 V

### 30-50 kw

how many watts does a high voltage generator have?

### 150 kw

Cardiovascular and interventional generators have how many watts

### maximum available power

Max mA at 100 kvp at 100 mS is what equation?

### 12-16%

three phase and high frequency generators results in a ____ to ___ increase in x rays produced than single phase.

### 12-16%

when going from single phase to three phase we must decrease KV how much?

### capacitors

these store power

### Smaller, easy to charge

what are advantages of capacitor discharge units (mobile)

### Capacitor Discharge unit

Inadequate x-rays, use of wall outlet is necessary, requires charging time between each exposure, older units may be hazardous are characteristics of what unit (mobile)

### Capacitors

the size of plates, space between plates and ability of dielectric to support electrostatic forces all are factors affecting what?

### High Frequency mobile units

what type of mobile unit is the best and most expensive?

### C-arm

this type of mobile unit can take dynamic and static images.

### electrons

the function of a filament circuit is to regulate the number of ____ available at the filament.

### 3-5, 10-12

the filament circuit supplies ___ amps, and ___ volts

### step down

the Filament circuit has what type of transformer?

### Rectifiers

Process of changing AC to DC is possible by using:

### Secondary side of step-up transformer

where are rectifiers located?

### Solid State Rectifiers

What types of rectifiers are used today?

### semiconductor diodes

solid state rectifiers can also be called :

### silicon

what is the most common material for a semiconductor?

### N and P

what are the two types of solid state semiconductor rectifiers?

### Negative

N type of a crystal lattice of silicon has an extra electron giving it a _____ charge.

### Positive

P type of the crystal lattice of silicon has a whole in it give it a ____ charge.

### P and N

This junction allows electron flow in only one direction

### Hole Drift

P-type silicon is sometimes called a

### Electron Drift

N-type silicon is sometimes called an

### no current

During a reverse portion of an AC cycle in a semiconductor Diode there is :

### compact size, more efficient, longer life

what are advantages of solid state diodes?

### Expensive

what are disadvantages of solid state diodes?

### True

T/F: In self-half-wave rectification, the negative part of an AC cycle is suppressed by the x-ray tube itself, which makes it act like a rectifier.

### does not utilize negative portion of AC cycle

what is the disadvantage of half-wave rectification?

### shorter time exposures

what is an advantage of full-wave rectifiers?

### Autotransformer

where is the power source for the Filament circuit.

### Variable resistor

what is the mA selector?

### Series

the Ammeter is connected in____.

### Secondary side of High Voltage Transformer/rectification

where is the mA meter?

### Because it has to read the actual tube current

why is the mA on the secondary side of the high voltage transformer?

### Amperage

filament current is measured in what?

### Tube Current

the number of electrons accelerated across an x-ray tube is called:

### False

T/F: Tube current is not controlled by filament current?

### True

T/F: Tube current can only be measured during an actual exposure?

### True

T/F: Filament current is current in the filament circuit.

### 10-12

the step down transformer reduces voltage from 110-220 to what?

### Space Charge Compensator

As electrons released from cathode small variations in kVp cause large changes in tube current. what device regulates this?

### timing circuit

seperate from the main circuits, this regulates the length of time of the exposure.

### tube failure

single exessive exposure which pits or cracks anode can cause?

### False

T/F: Long exposure time doesn't create wear and tear in an X-ray tube?

### True

T/F: Housing is generally cooled by Convection in the tube housing?