250 Final Review Flashcards by Casey Carden

What is electrification

the process of adding or removing electrons from an object

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

semi-conductor

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The neutralization of charged body is called

grounding

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

ampere

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

increase

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

110/.4= 275amps

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maximum amount of charge to be stored is:

capacitance

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measurement of conductivity

siemens

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amount of energy that prevents current to flow

resistance

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maximum amount of current induced

EMF

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

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

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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?

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

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

242

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A simple electric circuit must possess which of following components?

potential difference
resistance
source of current

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

Ohm’s Law

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How many amps are in 800 milliamps?

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What type of permeability and retentivity does hard steel have?

low permeability, high retentivity

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

magnetic lines of force

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

magnet domain

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

paramagnetic

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Which of the following is capable of creating a magnet?

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

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Anything that occupies space and possesses inertia

matter

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Same atomic number with different neutron number

isotope

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smallest subdivision of a compound

element

Basis of matter: smallest particle of an element

atom

The N shell can hold a maximum of _______ electrons.

A neutron's mass weighs approximately

1.6 x 10 - 24 grams

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

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

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

valence (

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

inert

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......

photons

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

a positive ion

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

isobars

A material that allows electrons to flow under certain conditions is

a semi conductor

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

induction

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

grounding

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

most obtuse

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

directly proportional to

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?

3200

A device that converts electrical energy to mechanical energy?

motor

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

induction motor

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

external circuit of resistance

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

commutator rings

In an AC circuit, current is hindered by:

impedance

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

inductance reactance

A DC generator produces a current that is

pulsating in one direction

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?

5 ohms

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

.68

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

True

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

Step up; voltage

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

100 KV

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

choke coil rheostat saturable reactor

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

less loss of magnetic flux

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

electromagnetic mutual induction

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

choke coil

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?

200 taps

The output of a step down transformer is

lower ampere

Rectification is the process that.......

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

The primary disadvantage of self rectification is

the limitation of high exposure factors

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

During the positive half of the cycle the rectifiers are

conductive

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

change in transformer polarity

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

drops about 3%

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

deficiency of electrons (

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

solid state diode

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

greater patient dose

p-type

gallium silicon

n-type

arsenic silicon

suppress the negative cycle

half wave rectification

insufficient potential difference

self rectification

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

full wave rectification

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

circuit breaker

transformer

regulates power

rheostat

variable resistor to control filament current

recitifiers

redirect current through X-ray tube

pre-reading KV meter

measures voltage on primary side

line voltage compensator

regulates power coming into the circuit

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

mA meter

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)

grounding

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

modern electronic timer

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

choke coil

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

primary side of filament circuit

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)

mA meter

kV meter

measures voltage

mA meter

attached to the secondary side of the step up transformer

saturable reactor

primary filament circuit

high tension cables

secondary voltage section