Deck 4: X-Ray Circuit

Question 1

The ampere is the unit of measure for:

A) electric current
B) electric potential
C) resistance
D) electrostatics

Answer 1

electric current

Question 2

The property of a circuit that impedes the flow of electrons is:

A) electric current
B) electric potential
C) resistance
D) electrostatics

Answer 2

resistance

Question 3

A volt is the potential difference that will maintain a current of _____ ampere in a circuit with a resistance of ______ ohm.

A) 1;2
B) 2;1
C) 1;1
D) 2;2

Answer 3

1;1

Question 4

A 12-volt battery use 12 joules of energy to move:

A) 1 coulomb of charge
B) 2 coulombs of charge
C) 12 coulombs of charge
D) 24 coulombs of charge

Question 5

When there is movement of some of the electrons of an uncharged metallic object as it is brought into the electric field of a charged object,this is electrification by:

A) contact
B) friction
C) induction
D) A and B

Question 6

The flow of electrons along a conductor is:

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 7

One of the laws of electrostatics is that like charges ________ and unlike charges ___________.

A) attract;repel
B) attract;attract
C) repel;attract
D) repel;repel

Question 8

Electrification by induction requires that the two objects:

A) are in direct,constant contact with each other
B) are not at all in contact with each other
C) contact each other and then separate
D) are as far apart as possible from each other

Question 9

To get electrons to flow along a conductor,there must be:

A) an excess of negative charges at one end of the wire
B) an excess of negative charges at both ends of the wire
C) an excess of positive charges at one end of the wire
D) an excess of positive charges at both ends of the wire
E) A and C

Question 10

The study of electric charges in motion is:

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 11

A volt is the ratio of work per unit of charge and is written:

A) joules/coulomb
B) coulomb/joules
C) watt/coulomb
D) coulomb/watt

Question 12

Rubbing a rubber rod with fur is an example of electrification by:

A) contact
B) friction
C) induction
D) A and B

Question 13

If a conductor is curved,the greatest amount of charge will be found:

A) at the beginning of the conductor
B) at the end of the conductor
C) at the area of the greatest curvature of the conductor
D) along the straightest area of the conductor

Question 14

As two charges get closer,the electrostatic force:

A) is directly proportional to the amount of distance between them
B) is inversely proportional to the amount of distance between them
C) is inversely proportional to the square of the distance between them
D) is directly proportional to the square of the distance between them

Question 15

One coulomb is equal to the electrical charge of 6.25 × 10¹⁸:

A) electrons
B) protons
C) neutrons
D) nuclei

Question 16

Electricity is typically thought to be:

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 17

The unit of measurement of electrical charges (SI)is:

A) watt
B) joule
C) newton
D) coulomb

Question 18

The ability to do work because of a separation of charges is:

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 19

The study of stationary electric charges is:

A) electromagnetism
B) electrodynamics
C) electronics
D) electrostatics

Question 20

The volt is the unit of measure for:

A) electric current
B) electric potential
C) resistance
D) electrostatics

Question 21

Ohm's Law can be written as:

A) I = V/R
B) I = R/V
C) R = I/V
D) R = IR

Question 22

A closed pathway of wires and related elements is a(n):

A) diode
B) fuse
C) rheostat
D) electric circuit

Question 23

Kilovolt peak is abbreviated as:

A) kP
B) kPk
C) kVPk
D) kVp

Question 24

When a conductor is longer:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of the above

Question 25

Ohm's Law can be written as:

A) amps = volts × ohms
B) volts = amps × ohms
C) ohms = volts × amps
D) none of the above

Question 26

A material that resists the movement of electrons is a(n):

A) ohm
B) insulator
C) conductor
D) inductor

Question 27

Glass is an example of a(n):

A) insulator
B) conductor
C) material that allows the flow of electrons
D) inductor

Question 28

Which of the following is NOT a good insulator?

A) glass
B) gold
C) wood
D) ceramic

Question 29

Which of the following is NOT a good electrical conductor?

A) gold
B) copper
C) glass
D) water

Question 30

When a switch is turned on,the electric circuit:

A) is closed
B) does not allow electrons to flow
C) is opened
D) none of the above

Question 31

When a metallic conductor is colder:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of the above

Question 32

A(n)______ is the electrical resistance between two points along a conductor that,when one volt is applied,produces 1 ampere of current.

A) amp
B) volt
C) ohm
D) watt

Question 33

Which of the following materials is a good conductor?

A) glass
B) copper
C) plastic
D) they are all good conductors

Question 34

When a conductor has a smaller cross-sectional area:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of the above

Question 35

When a conductor is more twisted:

A) resistance decreases
B) resistance increases
C) resistance remains the same
D) none of the above

Question 36

A material that allows electrons to move is a(n):

A) volt
B) insulator
C) conductor
D) inductor

Question 37

Current that changes direction in the conductor is:

A) alternating current
B) indirect current
C) direct current
D) weak current

Question 38

A battery produces:

A) alternating current
B) indirect current
C) direct current
D) current that changes direction

Question 39

The ampere is defined as ______ coulomb passing by a point in ____ second.

A) 1;1
B) 2;1
C) 1;2
D) 2;2

Question 40

Rubber is:

A) an excellent conductor
B) an excellent insulator
C) a weak conductor
D) a weak insulator

Question 41

A device that temporarily stores charge is the:

A) rheostat
B) capacitor
C) transformer
D) fuse

Question 42

The force of magnetic attraction varies:

A) directly with the square of the strength of the poles
B) inversely with the square of the strength of the poles
C) directly with the square of the distance between the poles
D) inversely with the square of the distance between the poles

Question 43

Which of the following opens a circuit to keep the circuit and devices safe?

A) fuse
B) resistor
C) circuit breaker
D) A and C

Question 44

Magnetic field strength is measured in:

A) tesla
B) ohms
C) newtons
D) joules

Question 45

Like poles of a magnet _________ each other and opposite poles ________ each other.

A) attract;attract
B) repel;repel
C) attract;repel
D) repel;attract

Question 46

Inside the magnet,the lines of flux travel from:

A) north pole to south pole
B) south pole to north pole
C) east pole to west pole
D) west pole to east pole

Question 47

The device that produces electrons through a chemical reaction is a:

A) transformer
B) fuse
C) resistor
D) battery

Question 48

Which of the following devices allow the electricity to flow in one direction only?

A) fuse
B) switch
C) transformer
D) diode

Question 49

Which of the following devices can increase or decrease voltage by a set amount?

A) battery
B) capacitor
C) transformer
D) A and C

Question 50

An adjustable form of a resistor is the:

A) rheostat
B) capacitor
C) switch
D) diode

Question 51

Outside the magnet,the lines of flux travel from:

A) north pole to south pole
B) south pole to north pole
C) east pole to west pole
D) west pole to east pole

Question 52

Wood and plastic are considered:

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 53

The idea that electricity flowing through a conductor produces a magnetic field was identified by:

A) Faraday
B) Roentgen
C) Tesla
D) Oersted

Question 54

The purpose of grounding is to:

A) provide a source for electricity
B) neutralize a charged object
C) replace the circuit breaker
D) none of the above

Question 55

A material that is weakly repelled by a magnetic field is classified as:

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 56

A material that is strongly attracted to a magnetic field is:

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 57

A material that is weakly attracted to a magnetic field is:

A) nonmagnetic
B) paramagnetic
C) ferromagnetic
D) diamagnetic

Question 58

The device that regulates the amount of current flowing in the circuit is the:

A) battery
B) resistor
C) fuse
D) transformer

Question 59

The lines of force in space associated with a magnet are called:

A) lines of flux
B) dipoles
C) domains
D) lines of field

Question 60

The ability of a material to attract iron,cobalt,or nickel is called:

A) electromagnetism
B) potential difference
C) magnetism
D) voltage

Question 61

A step-down transformer results in:

A) increased current
B) increased voltage
C) A and B
D) none of the above

Question 62

Slowing down the speed at which the conductor passes through the magnetic field results in:

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction

Question 63

A transformer with 100 times more turns on the secondary side as compared with the primary:

A) is a step-up transformer
B) is a step-down transformer
C) is a transformer that works on self-induction
D) will have 100 times the current on the secondary side

Question 64

Mutual induction involves electricity being induced into a ______________.

A) primary coil
B) secondary coil
C) moving magnetic field
D) none of the above

Question 65

A step-down transformer results in:

A) decreased current
B) decreased voltage
C) A and B
D) none of the above

Question 66

The idea that electricity could be induced in a wire by moving it through a magnetic field was discovered by:

A) Faraday
B) Roentgen
C) Tesla
D) Oersted

Question 67

A step-up transformer results in:

A) increased current
B) increased voltage
C) A and B
D) none of the above

Question 68

Increasing the strength of the magnetic field results in:

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction

Question 69

The autotransformer:

A) uses self-induction
B) uses two coils of wire
C) does not use a magnetic core
D) is not typically found in an x-ray machine

Question 70

Closed-core and shell-type transformers:

A) are seldom used in x-ray equipment
B) are less efficient types of transformers
C) are simpler types of transformers
D) none of the above

Question 71

With mutual induction,to induce voltage in the secondary coil,there must be:

A) a physical connection between the two coils of wire
B) alternating current in the primary coil of wire
C) direct current in the primary coil of wire
D) A and B

Question 72

An electromagnet includes:

A) a coil of wire
B) an iron core
C) a solenoid
D) all of the above

Question 73

Self-induction is based on the concepts introduced in:

A) Ohm's law
B) Lenz's law
C) Oersted's law
D) Faraday's law

Question 74

Reducing the number of coils in the wire will result in:

A) increased electromagnetic induction
B) reduced electromagnetic induction
C) no effect on electromagnetic induction

Question 75

A device that converts electrical energy to mechanical energy is a:

A) motor
B) transformer
C) generator
D) electromagnet

Question 76

With self-induction,the secondary current:

A) is in a secondary coil
B) is in the original coil
C) opposes the original current
D) B and C

Question 77

_______________ current is induced in the secondary coil when mutual induction takes place.

A) alternating
B) direct
C) neither of the above
D) both of the above

Question 78

A transformer with 100 turns on the primary side and 50 turns on the secondary:

A) is a step-up transformer
B) is a step-down transformer
C) is a transformer that works on self-induction
D) will have 100 times the current on the secondary side

Question 79

A device that converts mechanical energy to electrical energy is a:

A) motor
B) transformer
C) generator
D) electromagnet

Question 80

A step-up transformer results in:

A) decreased current
B) decreased voltage
C) A and B
D) none of the above