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corectec > Exercise 5 > Flashcards

Exercise 5 Flashcards

0
Q

What are the swirling currents called hat are induced in transformers and produce heat losses?

A

Eddy currents

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1
Q

What is it called when a solenoid has an iron core in its center?

A

An electromagnet

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2
Q

What is a permeable material?

A

Materials that are easily magnetized and demagnetized.

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3
Q

If a step down transformer has a turns ratio of 1:10, what will the output voltage be if the input voltage is 220V?

A

22V

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4
Q

What is the atomic number of an atom equal to?

A

The number of protons

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5
Q

What type of radiation is produced when a high speed electron is slowed down or suddenly stopped?

A

Bremsstrahlung radiation

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6
Q

How many angstroms are in a meter?

A

10,000,000,000

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7
Q

What type of transformer has more turns of wire in the secondary side than the primary side?

A

Step-up transformer

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8
Q

How you you figure out what the root mean square (RMS) value is on a single phase unit?

A

Multiply .707 by the kilovoltage peak

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9
Q

What type of bond holds atoms together because of their charge?

A

Ionic bond

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10
Q

What type of transformer core is most widely used in radiographic equipment? Why?

A

Shell type because it has it’s primary and secondary coils wrapped on top of each other maximizing the effects if the mutual induction

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11
Q

When were X-rays discovered?

A

November 8 1895

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12
Q

Describe a generator?

A

A coil of wire rotating through a magnetic field and produces an electric current

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13
Q

What is energy loss, caused as magnetic domains rearrange in a transformer in the form of heat, called?

A

Hysteresis losses

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14
Q

What is the major reason for using an alternating current?

A

Transformers cannot work without it. Alternating currents create the fluctuating magnetic fields a transformer needs to transfer energy from the primary side to the secondary side.

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15
Q

What is the formula for electrical power?

A

P=VI

Power=Voltage x Amperage

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16
Q

In the normal diagnostic range what is the wavelength range of X-rays?

A

.1-.5 angstroms

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17
Q

How does a motor work?

A

By sending an alternating current through a coil of wire that has been placed within a magnetic field. The alternating current through the coil produces a fluctuating magnetic field which is repelled and attracted by the stationary magnetic field causing the motor to spin.

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18
Q

What determines the strength of a magnetic field?

A

The number of flux lines in an area

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19
Q

What formula is used to find how many electrons will fit within a given shell of an atoms?

A

2 x n-squared

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20
Q

What is a device whose electrical resistance may vary called? What does it do?

A

A rheostat

Controls the amount of current in a switch

21
Q

On a spinning top, how many dots would show during a one second full wave rectified exposure?

A

120, one for each impulse

22
Q

If the voltage is stepped up, what happens to the current in the secondary side of the transformer?

A

Decreases

23
Q

A material that disallows the flow of electrons is known as what?

A

Insulator

24
Q

Name the electromagnetic waves from the shortest to longest wavelengths.

A

Xray, ultraviolet, visible light, radar

TIP: The shorter the wavelength the higher the energy

25
Q

What type of current is supplied by a battery?

A

Direct

26
Q

What are materials called that are weakly attracted to a magnet?

A

Paramagnetic

27
Q

An excessive amount of electrons at one end of a conductor and a deficiency at the other is known as what!? Explain

A

Voltage

The potential difference between the two ends of a conductor determines how much force will be applied to the electrons in the conductor. This pushing and pulling force is called voltage.

28
Q

Who is given credit for describing what an atom looks like?

A

Neils Bohr

29
Q

What will create the most resistance?

A) long wire small diameter
B) short wire small diameter
C) long wire large diameter
D) short wire large diameter

A

A) long wire snake diameter

30
Q

What is the device that measures electrical current called?

A

Ammeter

31
Q

What is the unit of capacitance? Define it and it’s equation for measurement

A

Farad

The amount of charge per volt that can be stored on metal plate

C(capacitance in farads)=q(charge)/V

32
Q

What is the unit for resistance?

A

Ohm

Represents the characteristics of a material that inhibits the flow of electrons

33
Q

What is constant throughout a series circuit?

A

Amperage

34
Q

What is the unit of electrical power?

A

Watt

35
Q

What type of bond holds atoms together by sharing their outer electrons?

A

Covalent

36
Q

What is a device that stores electrical charges called?

A

Capacitor

37
Q

What is the unit of electrical charge?

A

Coulomb

38
Q

What is power and it’s equation?

A

The rate at which work is done

P=work/time

39
Q

What is the prefix for one million?

A

Mega

40
Q

What is the unit of force?

A

Newton

41
Q

What is the formula for ohms law?

A

V=IR

Voltage=amperage x resistance

42
Q

What is the unit of electrical current?

A

Amperage

43
Q

What is the formula for voltage?

A

V=W/Q

Voltage=joule/coulomb

44
Q

What unit measures work done on a charged particle?

A

Volt

45
Q

What type of generator has a voltage ripple of less than 1%?

A

High frequency generators

46
Q

What type of motor drives the rotating anode? Why is it called that?

A

An induction motor. The stator is on the outside of the glass tube and it induces the rotor on the inside of the tube to spin.

47
Q

What type of current is indicated by the milliammeter?

A

Tube current

48
Q

What type of current supplies the X-ray tube?

A

Pulsating direct current

49
Q

What conversion occurs in the image at the output phosphor of an image intensifier tube?

A

Electrons are converted to visible light

50
Q

Where is the xray circuit is the timer located?

A

Between the auto transformer and the step up transformer

51
Q

Why are high frequency generators more efficient at producing X-rays than single phase generators?

A

Voltage never drops to zero so there is a continuous production of X-rays

corectec (5 decks)

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