Chapter 4 Test Flashcards
Most xray circuits used in the United States are designed to operate on a 220 volt:
a.) 50 hertz direct current power supply
b.) 60 hertz direct current power supply
c.) 120 hertz alternating current power supply
d.) 60 hertz alternating current power supply
d.) 60 hertz alternating current power supply
What converts alternating current (AC) to direct current (DC) in the xray circuit?
a.) a rectifier
b.) the ma meter
c.) the exposure timer
d.) the voltage line compensator
a.) a rectifier
Electrodynamics is known as “electricty”
a.) true
b.) false
a.) true
What is the primary difference between direct current (DC) and alternating current (AC) within an electrical circuit?
a.) velocity of electron flow
b.) direction of electron flow
c.) maximum power capacity
d.) minimum power capacity
b.) direction of electron flow
The solid state rectifier has an ___________ crystal and an ______________ crystal.
a.) p type and n type
b.) x type and z type
c.) a type and c type
a.) p type and n type
Which of the following is the most common type of exposure timer in an xray circuit?
a.) synchronous
b.) electronic
c.) autotransformer
d.) phototimer
b.) electronic
An autotransformer is used to control which aspect of the xray circuit electrical supply?
a.) resistance
b.) rectification
c.) power
d.) voltage
d.) voltage
The step up transformer is responsible for:
a.) raising voltage, decreasing current
b.) raising current, raising voltage
c.) raising current, decreasing voltage
a.) raising voltage, decreasing current
The volt is the unit of measure for:
a.) resistance
b.) electromagnetism
c.) electric current
d.) electric potential
d.) electric potential
Which aspect of the xray circuit protects the system from power surges and short circuits?
a.) autotransformer
b.) the circuit breaker
c.) exposure timer
d.) kvp meter
b.) the circuit breaker
As a waves wavelength decreases, its frequency
a.) depends on the type of emr
b.) increases
c.) stays the same
d.) decreases
b.) increases
The current passing between the secondary side of the high tension transformer and the rectifiers is best described as a type of :
a.) low voltage DC
b.) high voltage AC
c.) low voltage AC
d.) high voltage DC
b.) high voltage AC
The ability to do work because of a seperation of charges is:
a.) resistance
b.) electric potential
c.) electrostatics
d.) electric current
b.) electric potential
Total current (amperes) is calculated by:
a.) multiplying voltage ad resistance
b.) adding voltage and resistance
c.) multiplying voltage resistance and ohms
d.) dividing voltage by resistance
d.) dividing voltage by resistance
Which of the following would likely be classified as a ferromagentic material?
a.) iron
b.) water
c.) air
d.) gadlinium
a.) iron
Which component of the xray circuit must be powered by alternating current (AC) in order to function correctly?
a.) the transformers
b.) the rectifiers
c.) exposure timer
d.) ma selector
a.) the transformers
The resistance of electric flow through a circuit is measured in:
a.) volts
b.) joules
c.) ohms
d.) amperes
c.) ohms
A material that has a large number of free electrons is a:
a.) all choices are correct
b.) good insulator
c.) good conductor
d.) all choices are correct
c.) good conductor
The reduction of voltage and development of high amperage by a step down transformer occurs in the:
a.) high tension portion of the secondary circuit
b.) none of the options are correct
c.) primary portion of the circuit
d.) secondary portion of the circuit
b.) none of the options are correct
Circuit overloads occuring in sensitive components of an electrical circuit can be prevented by the use of which of the following devices?
1.) thermionic diodes
2.) fuses
3.) exposure timers
2 only
The line voltage compensator is located:
a.) on the secondary side of the filament transformer
b.) on the primary side of the step up transformer
c.) on the secondary side of the autotransformer
d.) on the primary side of the autotrasnformer
d.) on the primary side of the autotransformer
The principle purpose of the high voltage transformer is to do which of the following?
a.) rectify voltage
b.) stabilize voltage
c.) reduce voltage
d.) increase voltage
d.) increase voltage
In the absesnse of the autotransformer the step up and step down transformer would be supplied with a continuous voltage of:
a.) 220 volts
b.) 110 volts
c.) 440 volts
d.) 60 volts
a.) 220 volts
Which device terminates exposure by using a combination of ionization cells or chambers?
a.) synchronous timer
b.) mAs timer
c.) automatic exposure control
d.) electronic timer
c.) automatic exposure control
Milliampere seconds (mAs) is a unit of:
a.) electromagnetic force
b.) electrostatic charge
c.) electric potential
d.) electric current
d.) electric current
What is the secondary output voltage of the autotransformer when the assigned tube potential (set at the console) is 76 Kvp
a.) 220 v
b.) 76 v
c.) 220 kvp
d.) 76 kv
b.) 76 v
The step down transformer is located on the:
a.) secondary circuit
b.) xray tube
c.) primary circuit
d.) filament circuit
d.) filament circuit
Nearly all discussion of electricity deals with the movement of:
a.) negative charges
b.) positive charges
c.) neutrons
d.) all of the above
a.) negative charges
The step up transformer in the xray circuit serves to modify the current within the xray system to converting:
a.) single phase to three phase
b.) low frequency to high frequency
c.) volts to kilovolts
d.) amos to kilovolts
c.) volts to kilovolts
What is the function of a line compensator?
a.) to adjust tube current
b.) to adjust the voltage across the step up transformer
c.) to adjust variations in voltage from the power supply to the circuit
c.) to adjust variations in voltage from the power supply to the circuit
Which of the following materials is a good conductor of electricity?
a.) copper
b.) glass
c.) pastic
d.) all are good conductors
a.) copper
The shift of electrons fromone object to another without being in contact with each other is electrificatioon by:
a.) induction
b.) friction
c.) grounding
d.) contact
a.) induction
In order to create sufficient heat within the cathode filament the power supplied to the filament must be:
a.) high amperage
b.) high frequency
c.) high voltage
a.) high amperage
What exposure setting directly affects the voltage change within the autotransformer?
a.) kvp station
b.) density setting
c.) the ma station
d.) exposure time
a.) kvp station
The voltage in the secondary circuit of a modern xray circuit is normally about ___________ than the voltage in the primary circuit.
a.) 500 times lower
b.) 20 times lower
c.) 500 times higher
d.) 1000 times higher
d.) 1000 times higher
Which of the following conditions or enviroments will provide the least resistance?
a.) long conductor
b.) high temperature conductor
c.) glass material
d.) a large cross sectional area
d.) a large cross sectional area
Magnetic flux is:
a.) groups of smaller magnets
b.) the magnezitation of other materials
c.) magnetic material
d.) curved lines of force in space
d.) curved lines of force in space
The removal of electrons from an object by rubbing it with another is electrification by:
a.) grounding
b.) contact
c.) induction
d.) friction
d.) friction
Which type of generator uses multiple sources of alternating current so that the voltage never drops to zero?
a.) single phase half wave
b.) three phase
c.) single phase full wave
d.) failing load
b.) three phase
The experimental link connecting electric and magnetic forces was discovered by:
a.) volta
b.) faraday
c.) lenz
d.) oersted
d.) oersted
Within a parallel circuit the breaking of a single path will stop the flow of electricity throughtout the entire circuit.
a.) true
b.) false
b.) false
The autotransformer is a single coil of wire wrapped around an iron core. It operates on the principle of:
a.) convection
b.) self induction
c.) mutual induction
b.) self induction
A diode allows current to flow in single directions.
a.) true
b.) false
a.) true
The control for the amount of filament current in most modern digital radiographic units is directly related to the:
a.) focal spot size selection
b.) milliamperes selection
c.) timer setting selection
d.) kilovoltage selection
b.) milliamperes selection
What is the voltage ripple of a high frequency generator?
less than 1 percent
What is voltage ripple for a single phase generator?
100 percent
Which of the following statements describes the location of the autotransformer within the xray circuit?
a.) between the step up transformer and the xray tube
b.) between the step down transformer and filament
c.) between the rectifier bridge and the xray tube
d.) between the main power supply and the step up transformer
d.) between the main power supply and the step up transformer
What measures voltage output from the autotransformer
a>) filament
b.) ma meter
c.) line compensator
d.) kv meter
d.) kv meter
voltage ripple for a three phase six pulse generator is
a.) 13 percent
b.) 1 percent
c.) 100 percent
d.) 3.5 percent
a.) 13 percent
To avoid damaging the xray tube components the electrical power supplied to the xray tube must be:
a.) direct current
b.) low voltage
c.) high voltage
d.) alternating current
a.) direct current
A transformer operates on the principle of
a.) electromagnetic induction
b.) magnetism
c.) mechanical transformation
d.) electromechanical action
a.) electromagnetic induction
The technologist chooses the desired kvp setting using the autotransformer through a process called:
a.) rectification
b.) mutual induction
c.) self induction
d.) voltage ripple
c.) self induction
step down transformer is responsible for:
a.) raising voltage,decreasing current
b.) decreasing current, decreasing voltage
c.) raising current, raising voltage
d.) raising current, decreasing voltage
d.) raising current, decreasing voltage
Which of the following devices can be sued for the storage of electrical charge?
a.) battery
b.) variable resistor
c.) transformer
d.) rectifier
a.) battery
An adjustable form of a resistor is the:
a.) rheostat
b.) switch
c.) capacitor
d.) diode
a.) rheostat
Which of the following is a method of electrification?
a.) excitation
b.) resonance
c.) induction
d.) diffraction
c.) induction
A transformer with a greater number of wire turns on the primary compared to the secondary side would be considered an:
a.) autotransformer
b.) step up transformer
c.) step down transformer
c.) step down transformer
Which of the following current waveforms creates a constant voltage without any fluctuation of the polarity?
a.) unrectified AC
b.) direct current
c.) full wave rectified AC
d.) half wave rectified AC
b.) direct current
A diode allows electrons to flow in only one direction
a.) true
b.) false
a.) true
The waveform of commercial power supply to the xray circuit is an:
a.) direct current
b.) alternating current
b.) alternating current
The purpose of grounding is to:
a.) replace the circuit breaker
b.) neutralize a charged object
c.) ensure constant voltage
d.) provide a source for electricity
b.) neutralize a charged object
A current with a single path for electric current flow is defined as:
a.) open circuit
b.) parallel circuit
c.) closed circuit
d.) series circuit
d.) series circuit
Within a transformer, electromagnetic induction is the process through which:
a.) an alternating current is converted to an alternating current
b.) a direct current is converted to an alternating current
c.) a fluctuating magnetic field creates an electric current
c.) a fluctuating magnetic field creates an electric current
In the xray circuit which transformer does voltage travel through first?
a.) step down transformer
b.) autotransformer
c.) mutual induction transformer
d.) step up transformer
b.) autotransformer
A line voltage compensator is incorporated into the primary circuit of a digital radiographic unit to:
a.) maintain a constant voltage coming into the circuit
b.) control the desired speed of the anode
c.) compensate for variations mas timer
d.) provide the desired filament charge
a.) maintain a constant voltage coming into the circuit
The difference or seperation in electrical charge between two points in a circuit is considered
a.) current
b.) frequency
c.) resistance
d.) voltage
d.) voltage
The cathode has what type of charge?
a.) positive
b.) negative
b.) negative
Which of the following statements describe the basic construction of an autotransformer within the xray circuit?
a.) an iron core and a single wire coil
b.) an air core and a single wire coil
c.) an air core and single wire coil
d.) an iron core and a double wire coil
a.) an iron core and signle wire coil
The process of creating electrons through heating a tungsten filament is referred to as:
a.) thermionic emmision
b.) mA
c.) rectification
d.) potential differnce
a.) thermionic emmision
the step up transformer is in both the primary and secondary circuit which circuit contains the coil of wire with the most turns?
a.) primary
b.) secondary
b.) secondary
