Equipment Final Review
Pascal's law explains how liquid pumps (such as the human heart or the brakes on your car) work: Applied pressure will be transmitted undiminished throughout any liquid because liquids:
resist compression
The energy that would be relased by complete annihilation of any particle of matter is referred to as the particles:
rest energy
Power loss is in the form of heat and is proportional to the:
square of amperage P=I2 R
Which of the following would not be classified as a dielectric:
steel
Which unit is equivalent to one 10-billonth of a meter?
the angstrom
When snow is forming from droplets of water in a cloud, the surrounding air:
is warmed
The SI unit for work and mechanical energy is the:
joule
The generic unit of energy is the:
joule
An x-ray machine has a 30 kilowatt (kW) generator . If the maximum kilovoltage avaliable is 150 kV , what will be the available tube current?
200 mA
At 110 volts EMF and a current of 5 amps , the electrical resistance much be:
22 ohms
In this diagram , how many positive pulses occur each second?
30
The interactions between all matter in the universe are governed by _______ different forces.
4
The secondary coil of a transformer has 20,000 turns ; the primary coild has 500 turns . If the 120 volts is supplied to the primary coil, what will be the resulting voltage in the secondary coil?
4800 volts
Like poles of a magnet will:
repel
40 ms = ____ seconds
0.04
Supermans gas krypton , has 36 electrons arranged in 4 "shells" how many electrons can it hold in its "M" shell:
18
If a circuit contains 30 ohms of resistance with 60 volts applied , the current flowing will be:
2 amps
Two positive 0.4 C charges are positioned 1 meter apart. the force between them is:
repulsive
1 Joule of work done on 1 coulomb of charge equals:
1 volt
Which of the following numbers is the same as 10 raised to the minus 6th power?
1/1,000,000
In this diagram, what is the length of time between points A and C?
1/120 second
A 60 watt lightbulb is turned on in your home with 120 volts of force supplied from the plug. The light bulb must be using:
1/2 amp of current
In most of Europe, the electricity supplied is 50 Hertz AC. How many times does the current stop and start in one second?
100
Approximately how many centimeters is the standard distance of the xray tube from the bucky when preforming a table top radiographic procedures?
120
A fluoroscopic examination is conducted using a 1.5 A (amperes) of electricity . that is equivalent to:
1500 mA
A flashlight holds two 1.5 volt batteries in series for a total EMF of 3 volts. The current flowing when the flashlight is turned on is 1/2 (0.5) amp . how much electrical resistance is being given by the flashlights bulb and wires?
6 ohms
The outermost "shell" of an atom can never hold more than _______ electrons in it.
8
Maximum electromagnetic induction will occur when a conductor (wire) moves through a magnetic field at what angle?
90 degrees
In any transformer, the change in amperage is always __________ the turns ratio of the transformer:
inversely proportional to
Which of the following is not a form of Ohms Law
I=VR
The degree to which various materials can be magnetized is called:
Magnetic susceptibility
The unit of force is the:
Newton
A parallel circuit is one in which:
two or more circuits are connected across different branches
Milliamperes is the unit to measure:
The flow rate of electrons in a circuit
In order for electrical current to flow there must be :
a closed conducting path and a potential difference
Anything that exerts a "push" or "pull" such that can it cause a change in motion of another body may be described as:
a force
The wavelength of xrays may be best describes as:
a fraction of an angstrom
Which of the following will create the most electrical resistance?
a long wire with a small diameter
In a common circuit, electrons actually move at speeds of:
about 2.5cm per hour
In electrical current, electrons always move rather than protons because by comparison, electrons :
all of the above
In a series circuit , what can NOT change throughout the circuit:
amperage
Which of the following does not belong in these terms?
ampere
An isotope is an atom which has:
an unusual number of nucleons
The molecules of a gas:
are not held in fixed positions relative to each other
The smallest unit of chemical compound is:
atom
Temperature measures the ________ of molecules.
average kinetic energy
In an induction motor:
both the rotor and the stator may have windings
In physics , which of the following is a fundamental unit (not a dervied unit):
centimeters
A battery converts:
chemical energy to electrical energy
The path over which an electric current flows is called a:
circuit
Electrical fields are always created inside:
conductors in moving magnetic fields
The greater the power rating of a device , the:
faster it does work
In the secondary coil of a transformer , induced electrical current will always flow in the opposite direction from the current supplied to the primary coil. This is:
is known as Lenz's law
The effect of electrical charges in motion through a conductor is referred to as:
current
For part of a circuit that has constant resistance, as voltage is increased:
current flow is increased
The direction of electrical current flow is traditionally defined by electricians as the:
direction of movement of a positive charge
Ohms law states:
electric current is the result of voltage divided by the resistance
To hold together the nucleus of an atom, the strong nuclear force must overwhelm:
electrical force
An an electron drops drops into a lower atomic shell , its positional form of potential energy is emitted as a ______ form of potential energy.
electromagnetic
An electrical current in a conductor consists of the flow of:
electrons
In this diagram, when comparing segment A to B with regards to electrons ----with segment B to C ; use the diagram of AC electricity below:
electrons are speeding up from A to B and slowing down from B to C
Ohms law states that the electrical current:
equals the voltage divided by the resistance
Anything which converts mechanical energy into electrical energy is an:
generator
In electrical circuits , one by-product of high resistance is:
heat
Condensation results in a:
increase in potential energy
Heating a substance can lead to two results ; It will either increase the temperature OR it will:
increase the potential energy
Materials that do not allow electrons to flow are:
insulators
Heat is defined as the flow of ______ from one substance to another:
internal energy
Which of the following represents the conversion of kinetic energy into potential energy:
lifting the book off of the table
A substance which occupies a definite volume of space, but does not retain a definite shape, would be a:
liquid
Toothpaste flows out of a tube squeezed at the far end because:
liquids cannot be compressed
A ______ always exists around a conductor in which current is flowing:
magnetic field
A million volts would be one:
megavolt
One thousandth of a millimeter would be an:
micron or micrometer
Which factor regulates the number of electrons available to produce xray photons?
milliamperage
The barium sulfate suspension which patients drink for an upper GI series is chemically best described as:
mixture
electrons flow from a:
negative to a positive pole
Electrons flow from:
negative to positive
Which of the following is about the width of your smallest fingernail?
one centimeter
At the moment a liquid changes state into gas , it changes:
potential energy
Most of the heat energy produced in an xray tube during an exposure is released by:
radiation
The only kind of heat transfer that can take place through vacuum space is:
radiation
If a 50-kilogram body is moved from outer space down to the earth, its mass will:
remain the same
In an electrical circuit , electrons are supplied by:
the conductor (wire)
In an alternating current:
the electrons flow in one direction then change direction during a cycle
Michael faraday discovered that a moving magnet will induce electricity to flow in a nearby wire. This is the principle of:
the generator
What is the main advantage of a parallel circuit?
the independence of the branches
Lenz law causes the rotor shaft of the xray tube to spin when an electrical current is supplied to the stator (coil of wire) surrounding it because:
the north pole of the magnetic field around the rotor is repelled by the north pole of the magnetic field around the stator
Within each shell of an atom , which of the two rules for electron configuration always takes precedence:
the octect rule
In a common circuit , the effect of the electrical current travels at :
the speed of light
A circuit is powered by a battery . the electrons flow:
through both the battery and the rest of the circuit
In "closed systems" such as the universe, laws of conservation demand that:
total energy must be equal before and after an event
Any device that can change one form of energy to another is called:
transducer
If an object is lifted from 10 meters to 20 meters above the ground it will have:
twice as much potential energy
In an AC circuit , the actual electrons:
vibrate back and forth
The unit of electrical potential is the:
volt
Electromotive force is measured in:
volts
The unit of measure for electrical power is the:
watt
Which of the following is not a form of energy:
work
Which of the following is not a form of naturally occurring radiation from radioactive nuclei:
xrays