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WorksheetsRAD 4100: X-ray Imaging Circuit & Generators Worksheet #1
Total questions: 46
Worksheet time: 23mins
If the primary coil of the x-ray transformer is supplied by 220V and has 2,000 turns, and the secondary coil has 1,000 turns, what would be the induced voltage in the secondary coil?
220 V
110 kV
40 V
110 V
In which of the following portions of the x-ray circuit is the step-down transformer used?
high voltage side
filament circuit
secondary side
rectifier system
A transformer with more turns in its secondary winding than in its primary winding would be expected to ________ voltage.
increase
decrease
step-up
step-down
The x-ray tube can operate only on ______ current.
direct
alternating
A transformer with 300 turns on the primary side and an input voltage of 150 V has 60,000 turns on the secondary side. This is a ______ transformer.
step-down
step-up
An autotransformer functions as a/an ______.
kVp meter
live voltage exposure device
A transformer described in the previous question has a secondary coil with 60,000 turns and a secondary voltage of 12,000 V. What is the input voltage if the primary coil has 300 turns?
200 V
150 V
What type of transformer is being described in the previous question?
step-up
step-down
In the x-ray circuit, would the transformer described above be used for the kVp meter or the x-ray tube?
kVp meter
x-ray tube
To prevent electrical shock, which of the following components of the x-ray circuit is placed between the autotransformer and the step-up transformer?
circuit breaker
rectifier
When the step-down transformer is used in the x-ray circuit, in case of current changes or power surges, which of the following is created?
transformer
rectifier
In the x-ray circuit, is the timer located between the step-down transformer and the x-ray tube, or between the rectifier and the x-ray tube?
between the step-down transformer and the x-ray tube
between the rectifier and the x-ray tube
The voltmeter is located in the x-ray circuit:
before the autotransformer, primary circuit
after the autotransformer, primary circuit
after the autotransformer, primary circuit
at the x-ray tube, secondary circuit
The three main parts of the x-ray imaging system are the x-ray tube, ________, and ________.
protective housing, console
console, high-voltage generator
rectifier assembly, console
The operating console contains circuits that are ________.
high voltage only
low voltage only
both high and low voltage
Variations in power distribution to the x-ray machine are corrected by the ________.
autotransformer
rectifier
filament transformer
Thermionic emission at the filament determines the voltage across the x-ray tube.
kVp
mA
resistance
filament current
The step-down transformer is located in the
high-voltage circuit
filament circuit
timer circuit
rectifier circuit
The most accurate type of timer is the
synchronous
mAs
electronic
mechanical
The automatic exposure control (AEC) terminates the exposure when a.
the radiologist releases the exposure switch
sufficient radiation is received
the x-ray tube filament is heated
the timer reaches zero
The AEC detector is located
between the patient and the image receptor
between the x-ray tube and the patient
in the control panel
in the high-voltage generator
The mAs timer is usually set to give the
lowest mA at the longest time
highest mA at the shortest time
lowest mA at the shortest time
highest mA at the longest time
The step-up transformer increases voltage
10 times
200-1200 times
500-1000 times
20-50 times
A diode allows electrons to flow
from cathode to anode
from anode to cathode
from anode to anode
from cathode to cathode
The high-voltage generator contains the high voltage transformer, the ______ transformer, and the rectifiers.
autotransformer
filament transformer
step-up transformer
The difference in the waveform between the primary and secondary sides of the high voltage transformer is ______.
frequency
amplitude
voltage
In modern imaging systems, the components for rectification are ______.
diodes
transformers
generators
With half-wave rectification the current flows through the x-ray tube during the ______ half of the cycle.
positive
negative
full
With half-wave rectification, the x-ray beam at the x-ray tube contains ______ pulses per second.
60 pulses
120 pulses
360 pulses
With full-wave rectification, the x-ray beam at the x-ray tube contains ______ pulses per second.
60 pulses
120 pulses
360 pulses
With full-wave rectification, the current flows through the x-ray tube during the ______ half of the cycle.
positive
negative
both
Fully rectified, three-phase units provide an x-ray beam at ______ pulses per second.
60 pulses
120 pulses
360 pulses
Voltage across the x-ray tube is most constant with ______ generators.
single-phase, half-wave rectification
single-phase, full-wave rectification
three-phase, full-wave rectification
Most mammography units operate with ______ generators.
single-phase
three-phase
high-frequency
A single-phase waveform has the ________ voltage ripple.
14%
4%
100%
1%
The x-ray beam generated by the circuit with the ________ quality.
highest, highest
lowest, lowest
highest, lowest
lowest, highest
The principal disadvantage of three-phase equipment is ________.
correction
term quality
cost
efficiency
What is the industry standard formula for calculating high voltage generator power?
Power = min mA (@100 kVP and 100 ms) × 100 kVP
Power = max mA (@100 kVP and 100 ms) × 100 kVP
Power = min mA (@100 kVP and 100 ms) × 100 kVP
Power = max mA (@100 kVP and 100 ms) × 100 kVP
The x-ray generator with the lowest power rating is the ________ imaging system.
three-phase, 12-pulse
three-phase, 6-pulse
single-phase
High frequency
19?
Autotransformer
Exposure time
Rectifier
X-ray tube
20?
Autotransformer
Exposure timer
X-ray tube
Filament circuit (step down)
21
Exposure timer
Rectifier
X-ray tube
High voltage transformer
22
Rectifier
X-ray tube
Autotransformer
High voltage transformer
23
Rectifier
X-ray tube
High voltage transformer
Autotransformer
24
Filament circuit (step down)
Rectifier
X-ray tube
Exposure timer
For the X-ray circuit in which component of the circuit is the voltage decreased and the current increased?
Step up transformer (High voltage transformer)
Step down transformer (filament circuit)
Rectifier
Autotransformer
