Equipment Final Review

40 ms=__ seconds

0.04

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?

1/120th second

Which of the following is not a form of Ohm's law?

I=VR

Which of the following must be changed in an atom in order to change the identity of the element?

Z number

In a series circuit, what can not change throughout the circuit

amperage

Which of the following is not related to the force applied to an electrical charge

amperage

The term electromagnetic induction refers to the production of

an electric current

The molecule of a gas

are not held in fixed positions relative to each other

In an induction motor

both the rotor and the stator may have windings

Condensation results in a(n)

decreases in potential energy

The direction of electrical current flow is traditionally defined by electricians as the

direction of movement of positive charge

To hold together the nucleus of an atom, the strong nuclear force must overwhelm

electrical force

The generic unit of energy is the

joule

The unit of force is the

newton

Which of the following is about the width of your smallest fingernail?

one centimeter

At the movement a liquid changes state into a gas, it changes

potential energy

Most of the heat energy produced in an X-ray tube during an exposure is released by

radiation

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 released by complete annihilation of any particles of matter is referred to as that particles

rest energy

In physics, which of the following is not a fundamental standard of measurement?

speed

Which of the following would not be classified as a dielectric

steel

Which unit is equivalent to one 10-billionth of a meter?

the angstrom

Which of the following occurs when the current in a wire increases?

the magnetic field strength increases

In a common circuit, the effect of the electrical current travels at

the speed of light

In an AC circuit, the actual electrons

vibrate back and forth

A 60-watt light bulb is turned on in your home with 120 volts of force supplied form the plug. The light bulb must be using

1/2 amp of current

In most 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 X-ray tube from the Bucky when performing tabletop radiographic procedures?

100cm

For the transformer in #99 above, if 600 mA is fed into the primary coil, what is the resulting secondary amperage, in mA?

15 mA

A fluoroscopic examination is conducted using 1.5 A of electricity. That is equivalent to

1500 mA

Superman's gas, Krypton, has 36 electrons arranged in 4 "shells" How many electrons can it hold in its shells

18

A fluoroscope is operated at 95 kVp and 2 mA. What is the power consumption at this technique?

190 W

If a circuit contains 30 ohms of resistance with 60 volts applied, the current flowing will be

2 amps

At 110 volts EMF, and a current of 5 amps, the electrical resistance must be

22 ohms

The interactions between all matter in the universe are governed by __ different forces.

4

If a textbook that is suspended 2 feet above your desk possesses 6 joules of potential energy relative to the desk, and is dropped, how much kinetic energy will it have when it reaches a point 1/2 foot above the desk?

4.5 joules

For the transformer in #99 above, what is the turns ratio?

40:1

A flashlight holds two 1.5 volts batteries in series for a total EMF of 3 volts. The current flowing when the flashlight is turned on is 1/2 amp. How much electrical resistance is being given by the flashlights bulb and wires?

6 ohms

In this diagram, how many positive pulses occurs each second?

60

Maximum electromagnetic induction will occur when a conductor moves through a magnetic fields at what angle?

90 degrees

The wavelength of x-rays may be best described 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 2.5 cm per hour

The dewars in an MRI machine keep the temperature of its super conducting magnetic coils at 4 degrees above

absolute zero

Any device which operates on the principle of electromagnetic induction must be powered by

alternating current

What is a device called that measures electrical current?

ammeter

In electrical current, electrons always move rather than protons because by comparison, electrons

are loosely bound in the atom, have much less mass, are far from the nucleus

Temperature measures the __ of molecules

average kinetic energy

In physics, which of the following is a fundamental standard of measurement? (not a derived unit)

centimeters

In the X-ray tube, example of heat dispersion by conduction is

circulation of oil surrounding an x-ray tube

In order for electrical current to flow, there must be

closed conducting path and a potential difference

Electrical fields are always created inside

conductors in moving magnetic fields

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

As an electron drops down into a lower atomic shell, its positional form of potential energy is emitted as a(n) __ form of potential energy

electromagnetic

Ohm's law states that the electrical current

equals the voltage divided by the resistance

The greater the power rating of a device, the

faster is does work

Heat transfer by convection is restricted to

fluids

Anything that exerts a "push" or "pull" such that it can cause a change in the motion of another body may be described as

force

Anything which converts mechanical energy into electrical energy is a(n)

generator

The mass of a small object, such as a pencil or pen, would be best measured using

grams

In electrical circuits, one by-product of high resistance is

heat

Heating a substance can lead to two results: It will either increase the temperature or it will

increase the kinetic energy

Heat is defined as the flow __ from one substance to another

internal energy

In any transformer, the change in amperage is always __ the turns ratio of the transformer

inversely proportional to

The strongest type of bonding of atoms together to form molecules is

ionic bonding

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 know as Lenz's law

When snows forming from droplets of water in a cloud, the surrounding air

it is warmed

One correct interpretation of Einsteins famous equation "E=mc^2" is that

it takes an enormous amount of energy to create a very small amount of matter

At the molecular level, sound and heat are actually both forms of

kinetic energy

Which of the following represent the conversion of kinetic energy into potential energy

lifting a book up off a 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 tube squeezed at the far end because

liquids cannot be compressed

A million volts would be one

megavolt

One-thousandth of a millimeter would be a(n)

micron or micrometer

The barium sulfate suspension which patients drink for an Upper GI series is chemically best described as a(n)

mixture

The smallest unit of a chemical compound is the

molecule

Hans Oersted discovered that a magnet will be deflected by a nearby electrical current. This is the principle of operation for the

moter

The only kind of heat transfer that can take place through vacuum space is

radiation

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

Milliamperes is the unit used to measure

the flow rate of electrons in a circuit

Micheal 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

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 demands that

total energy must be equal before and after an event

Any device that can change one form of energy into another is called a(n)

transducer

If an object is lifted from 10 meters to 20 meters above the ground, it will have

twice as much potential energy

A parallel circuit is one in which

two or more devices are connected across different branches

Electromotive force is measured in

volts

The unit of measure for electrical power is the

watt

On a periodic chart of the elements, when would the next atom listed move to the next row of "period?"

when the next electron added requires a new shell

Which of the following is not a form of energy

work