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RADT 250 - Equipment Operation II > 250 Final Review > Flashcards

250 Final Review Flashcards

1
Q

What is electrification

A

the process of adding or removing electrons from an object

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2
Q

A material that allows electrons to flow freely when temperature is elevated is termed:

A

semi-conductor

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3
Q

The neutralization of charged body is called

A

grounding

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4
Q

The amount of electrical charge flowing per second is measured by which of the following units?

A

ampere

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5
Q

If the resistance of a circuit increases, what change in voltage would occur?

A

increase

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6
Q

What is the current in a series circuit if the voltage is 110 volts and the resistance is .4ohms?

A

110/.4= 275amps

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7
Q

maximum amount of charge to be stored is:

A

capacitance

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8
Q

measurement of conductivity

A

siemens

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9
Q

amount of energy that prevents current to flow

A

resistance

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10
Q

maximum amount of current induced

A

EMF

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11
Q

What is the total resistance in a parallel circuit that has 4 resistors with 2ohms, 7 ohms, 1 ohm, and 4 ohms of resistance?

A

.53 R= the inverse of the total resistance (find common denominator, add up and reverse total and divide

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12
Q

How much current is in a series circuit flows over resistor 3 in a circuit with 240 volts and resistors of 2, 4, and 6?

A

20

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13
Q

What is the voltage in a circuit with 120 watts of power, 15 amps, and.534 ohms of resistance?

A

8

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14
Q

What is the power loss in a circuit with 11 amps, 2 ohms of resistance and 22 volts of potential difference?

A

242

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15
Q

A simple electric circuit must possess which of following components?

A

potential difference
resistance
source of current

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16
Q

What law illustrates the amount of potential difference in a electric circuit?

A

Ohm’s Law

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17
Q

How many amps are in 800 milliamps?

A

.8

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18
Q

What type of permeability and retentivity does hard steel have?

A

low permeability, high retentivity

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19
Q

The force traveling from South to North inside a magnet are called:

A

magnetic lines of force

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20
Q

Group of atoms within a magnet with the same spin state is termed:

A

magnet domain

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21
Q

A material that is slightly attracted to a magnetic force is called:

A

paramagnetic

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22
Q

Which of the following is capable of creating a magnet?

A

breaking a magnet in two
striking a magnetic material
rubbing a magnet

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23
Q

Anything that occupies space and possesses inertia

A

matter

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24
Q

Same atomic number with different neutron number

A

isotope

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25
Q

smallest subdivision of a compound

A

element

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26
Q

Basis of matter: smallest particle of an element

A

atom

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27
Q

The N shell can hold a maximum of _______ electrons.

A

32

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28
Q

A neutron’s mass weighs approximately

A

1.6 x 10 - 24 grams

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29
Q

On the periodic table, Copper (Cu) and Silver (Ag) have similar chemical properties. What properties are correct?

A

have similar chemical reaction characteristics. (are in the same Vertical group)

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30
Q

The outer shell of an atom determines its chemical binding properties. This is called the

A

valence (

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31
Q

An atom that does not give up or share an electron is called

A

inert

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32
Q

Electrons tend to move to the lowest shell level possible to fill an vacancies. The give up some o their energy when moving from an outer shell to an inner shell and release……

A

photons

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33
Q

A neutral atom that has lost a single electron will be termed

A

a positive ion

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34
Q

Two atoms that have the same mass number but different atomic numbers are termed:

A

isobars

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35
Q

A material that allows electrons to flow under certain conditions is

A

a semi conductor

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36
Q

When an object carrying an electric charge comes close to an uncharged object and the latter acquires the same charge, this process is termed:

A

induction

37
Q

The process of neutralizing a body of matter by removing excess electrons from a charged body of matter is termed:

A

grounding

38
Q

The concentration of charges on a curved surface are the weakest where the curve is

A

most obtuse

39
Q

The electrostatic force between two charges is _______ the product of their quantities.

A

directly proportional to

40
Q

What is the electrostatic force between 2 charges if charge #1 is 2C and charge #2 is 4C and the distance between them is .05 meters?

A

3200

41
Q

A device that converts electrical energy to mechanical energy?

A

motor

42
Q

What device utilizes iron bars, source of external current and a rotor?

A

induction motor

43
Q

In order for a generator to continue to produce current it must be attached to an

A

external circuit of resistance

44
Q

The armature of an DC generator is connected separately to a _______ which rates with the armature in the direction of N to S.

A

commutator rings

45
Q

In an AC circuit, current is hindered by:

A

impedance

46
Q

An opposing flow of current in a circuit creates a hinderance on the flow of current called:

A

inductance reactance

47
Q

A DC generator produces a current that is

A

pulsating in one direction

48
Q

How much impedance results in a circuit with 70 volts, 11 amps, 2 ohms of electrical resistance and 3 ohms of inductance reactance with no capacitance reactance?

A

5 ohms

49
Q

How much current is used with a 75 watt bulb connected to a 110 volt outlet?

A

.68

50
Q

AC generators need an armature to produce an EMF… (True or False)

A

True

51
Q

A fixed transformer that has greater windings on the secondary side is called a _____ and is in the ______ part of the circuit.

A

Step up; voltage

52
Q

How much emf is produced on the secondary side of a step up transformer with a 1:10,000 when 10 volts are applied?

A

100 KV

53
Q

Current on the primary side of a step down transformer can be supplied by

A

choke coil
rheostat
saturable reactor

54
Q

A closed core transformer is more efficient than an open core transformer as a result of:

A

less loss of magnetic flux

55
Q

A transformer converts one level or voltage to another level through:

A

electromagnetic mutual induction

56
Q

A device that regulates current to a step down transformer through variable electromagnetic induction is a

A

choke coil

57
Q

How many taps are connected in an autotransformer with 240 turns, supplied by 120 volts and applying 100 volts to the primary side of the step up transformer?

A

200 taps

58
Q

The output of a step down transformer is

A

lower ampere

59
Q

Rectification is the process that…….

A

during the positive cycle there is a surge of tube current allowing electrons to only pass from anode to cathode

60
Q

The primary disadvantage of self rectification is

A

the limitation of high exposure factors

61
Q

In a three has half wave rectified unit, there are how many rectifiers?

A

6

62
Q

During the positive half of the cycle the rectifiers are

A

conductive

63
Q

During the negative cycle the reverse voltage is actually higher than the useful voltage. This is due to

A

change in transformer polarity

64
Q

With three-phase full wave rectified equipment, the voltage across the X-ray tube

A

drops about 3%

65
Q

In a P-N type rectifier, the side with gallium has a

A

deficiency of electrons (

66
Q

Which of the following rectifier type is composed of a valance, forbidden zone and conductive band?

A

solid state diode

67
Q

A disadvantage of using a single phase unit over a three phase unit is:

A

greater patient dose

68
Q

p-type

A

gallium silicon

69
Q

n-type

A

arsenic silicon

70
Q

suppress the negative cycle

A

half wave rectification

71
Q

insufficient potential difference

A

self rectification

72
Q

What type of rectification occurs when the negative cycle is rerouted to the positive cycle?

A

full wave rectification

73
Q

What device in an X-ray circuit prevents overload of the circuit with a resettable connection?

A

circuit breaker

74
Q

transformer

A

regulates power

75
Q

rheostat

A

variable resistor to control filament current

76
Q

recitifiers

A

redirect current through X-ray tube

77
Q

pre-reading KV meter

A

measures voltage on primary side

78
Q

line voltage compensator

A

regulates power coming into the circuit

79
Q

Which is found on the secondary side of the x ray circuit?
(line voltage compensator, saturable reactor, kv meter, mA meter)

A

mA meter

80
Q

Which of the following can be found on the secondary side of the kV section of the X-ray circuit?
(kV meter, circuit breaker, rheostat, grounding)

A

grounding

81
Q

What timer is capable of allowing for 1/1000 second times?

A

modern electronic timer

82
Q

What device regulates current to the step down transformer through electromagnet induction?

A

choke coil

83
Q

Where can the ammeter be found in the X-ray circuit?

A

primary side of filament circuit

84
Q

All of the following x-ray circuit devices are located between the incoming power supply and the primary coil of the high voltage transformer EXCEPT:
(timers, kv meter, mA meter, autotransformer)

A

mA meter

85
Q

kV meter

A

measures voltage

86
Q

mA meter

A

attached to the secondary side of the step up transformer

87
Q

saturable reactor

A

primary filament circuit

88
Q

high tension cables

A

secondary voltage section

RADT 250 - Equipment Operation II (9 decks)

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