stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Physics Midterm 1209 Flashcards | StudBud
Explore
/
Physics Midterm 1209
Physics Midterm 1209
53 terms
·
StudBud Administration
·
25 plays
Imported from external platform
Flashcards
53 cards
F
Practice quiz
P
Host live
L
Questions
53
Answers
1
the term "phase" in an xray circuit refers to the :
number of wave cycles per second in the circuit
direction of current flow within the circuit
number of distinct wave cycles in the circuit
Amplitude of waves within the circuit
2
Electron like particles emitted from nucleus. Smallest quantity of mass and -1 charged removed
Alpha decay
Beta decay
3
Iron, copper, silver, brass, & water are what type of material?
All the above
Semiconductor
Insulator
Conductors
4
converting a 3-phase unrectified current to 3-phase 6-pulse current requires which of the following devices
step-up transformer
autotransformer
diodes
line-voltage compensator
5
which component of the x ray circuit ensures that electrons flow in only one direction through the x ray tube?
step up transformer
rectifiers
kVp selector
line voltage compensator
6
Which is not a base quantity of standard units of physics?
Electromagnetism
Time
Mass
Length
7
At a frequency of 60-hertz each cycle lasts?
1/60th of a second
1/120th of a second
110
O.00833
8
True or false: there are 2 types of circuits series and parallel?
False
True
9
The relationship between electrical resistance, pressure and flow: V=IR
Gauss law
Coulombs law
Inverse square law
Ohms law
10
Contact, friction, and induction are all methods of ________?
Elcectrostatics
Coulombs law
Electrification
Magnetism
11
the autotransformer includes which of the following devices?
kVp meter
kVp selector
exposure timer
circuit breaker
12
True or false: Direct current moves in just one direction?
True
False
13
The 2 types of mechanical energy are kinetic energy and chemical energy
False
True
14
Within a transformer, electromagnetic induction is the process through which a(n):
DC is converted to AC
AC is converted to DC
Fluctuating magnetic field creates a current
15
What type of induction uses an autotransformer with only 1 coil needed?
Self
Mutual
16
which of the following waveforms is not a type of pulsating direct current
three- phase unrectified
three-phase six-phase
single-phase full wave-rectified
high frequency
17
The turn ratio of a transformer is described as _____?
Number of secondary coils to the number of primary coils
Strength of primary magnetic field to the strength of the secondary field
Strength of secondary magnetic field to the strength of the primary field
Number of primary coils to the number of secondary coils
18
What is the transformer law formula?
V=IR
Vs = Vp x Ns/Np
19
a potential effect of using a three-phase, six-pulse technique chart for a high frequency x ray system is increased
image contrast
spatial resolution
receptor exposure
distortion
20
what is the function of the step-down transformer within the xray circuit?
increase voltage
increase resistance
increase frenquency
increase current
21
"Two poles" (+) and (-) which only allow electricity to pass through in one direction
Transformer
Alternating current
Diode
Rotor switch
22
What type of transformer is pictured in the diagram. Assume the left side of the transformer is the primary side
Step-down
Step-up
23
the step-up transformer in the x-ray circuit converts
single -phase to three -phase
low-frequency to high frenquency
amps to kilo-amps
volts to kilo-volts
24
What converts electrical energy into mechanical energy (including rotor & stator)
Motor
Generator
25
Volts/kilovolts and Angstroms of Diagnostic X rays
Old dose x (old dose)^2 / (new distance)^2
3x10^8 meters/sec 186,000 miles/sec
2N^2
30,000-150,000 volts (30-150kv) 0.1-0.5 Angstroms
26
What is defined as the period of time required for a quantity of radioactivity to be reduced to one-half it's value?
Decay Law
Attenuation
The ground state
Half life T 1/2
27
Rubber,glass, plastic, & dry wood are what type of material?
Semiconductor
All the above
Conductor
Insulator
28
What converts mechanical energy (movement) into electrical energy?
Generators
Motors
Transformers
Alternating current
29
which of the following devices is located within the secondary circuit of the x ray system
mA selector
kVp meter
x ray tube
exposure timer
30
"Counts" the number of revolutions of a synchronous motor spinning @ 60 cycles per second
Electronic
Synchronous motor timer
Counting timer
mAs timer
31
which of the following x ray generators creates a waveform in which the voltage fluctuates from max volts to zero volts
high frequency
three-phase unrectified
single-phase full wave rectified
three- phase six- pulse
32
What are the 2 characteristics of electricity
Current & power/force
AC and DC
33
Ferromagnetic means?
None of the above
Materials that are easily magnetized
Strongly attracted to magnets
Both Red and Blue
34
Which is NOT part of the basic X ray machine Circuits?
The high-voltage section
Grid factor
The control console circuit
The x-ray filiament circuit
35
True or false: Gauss is larger then Tesla
True
False
36
What is the ripple for 3 phase, 6 pulse (6 rectifiers) generator waveform?
4%
14%
37
What type of transformer has more turns in the secondary coil than in the primary and increases voltage and decrease Amp
Step - down
Step - up
38
Which type of transformer is incorpated within the high-voltage portion of the X ray circuit?
Autotransformer
Step up
Step down
39
Coulombs law finish the law -- if like charges repel each other, __________
The force of electric charges follows coulombs law
Electrical charges exist only on the surface of an object
Only negative charges can move
Opposite charges attract
40
the incoming line voltage received by most x ray systems is
220 volts
60 volts
110 volts
120 volts
41
Violent process, nucleus extremely unstable, results in lighter elements
Alpha Decay
Beta Decay
42
The 5 laws of ________?
Electrostatics
Electrification
Magnetism
Gauss' Law
43
What component(s) Is needed for electrical circuits?
A source of electrical power
All the above
A "load" that needs electrical power to operate
Conductive path
44
an autotransformer is used to control which aspect of the x-ray circuit electrical supply?
power
voltage
Resistance
rectification
45
strength of magnetic fields and pole strength are proportional & square distance between pole are inversely proportional
Coulombs Law
Inverse square law
Teslas Law
Gauss' Law
46
The max number of electrons that occupy a Shell under any conditions is equal to?
3x10^8
None of the above
T 1/2
2N^2
47
What is the ripple of a single phase generator waveform?
100%
<1%
48
what term describes the process through which free electrons are created within the x-ray tube?
bremsstrahlung
radioactivity
thermionic emission
photoelectric effect
49
Speed, Amplitude, Wavelength, and Frequency are characteristics of _____?
Speed of X-rays
Electromagnetic spectrum
Frequency
Waves
50
A transformer operates on the principle of ?
Transformation
Electromechanical action
Magnestism
Electromagnetic induction
51
What is the ripple for high frequency generator waveforms?
100%
4%
<1%
14%
52
Decreasing the intensity inversely proportional to the square of the distance of an object from the source is the ____?
Direct square law
Grid factor
15% rule
Inverse square law
53
Set a certain amount of charge to be allowed to build up on a capacitor
Pre-set
mAs timer
Synchronous motor timer
Electronic
