Rad science II - Test 2 - worksheets: 5-4 Magnetism, 5-5 Electromagnetic Effect Electromagnetic Induction, 5-6 Electric Generators and Motors, 5-7 The Transformer

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A 110 V heater requires 15 A. What is the power consumption?

1650 W

A fluoroscope is operated at 95 kVp, 2 m. What is its power consumption?

190 W

What power is required for a radiographic exposure at 76 kVp, 500 mA?

38 W

How much current will a 60 W light bulb draw from a 120 V receptacle?

500 mA

Electric current waveforms are graphs of:

Electric current vs. time Electric voltage versus time

The electric generator is most closely associated with experiments conducted by:

Faraday

Which scientist is associated with the early development of electromagnetism?

Faraday

Which of the following is most related to electromechanical devices? - Edison's law of electromechanics - Faraday's experiment - Len'z first law of electromagnetic - Oersted's experiment on mutual induction - The voltaic pile

Faraday's experiment

Electromechanical devices?

Generators and motors

A difference between self-induction and mutual induction is that:

Mutual induction requires two coils and self induction requires only one

The turns ratio is defined as:

Number of secondary windings divided by primary windings

The experimental link connecting electric and magnetic forces was discovered by?

Oersted

Classifications of magnetism?

Paramagnetism Diamagnetic non-magnetic

A navigational compass:

has both a north and south pole

When an electric current is induced by mutual induction, such current flows:

in the secondary coil

When a transformer is designed, the change in current is:

inversely proportional to the turns ratio

Given a closed loop of wire with no electron flow, an electric current can be induced if:

A changing magnetic field is present

In an electric generator:

A oil of wire is rotated in a magnetic field

A transformer with a turn ratio of 1000:1 is

A step-up transformer

The principal difference between a solenoid and an electromagnet is magnetic field ___.

Intensity

The transformer law?

Is/Ip = Np/Ns

A modern dry-cell battery is a source of?

Joule per coulomb

An induction motor is used in an x-ray imaging system to:

rotate the anode

In an induction motor, the only part to be rotated is the:

rotor

Transformer designed used in x-ray imaging system?

shell type

Most magnetic materials are:

still magnets when broken

The physical laws of magnetism requires:

that there be a south pole for every north pole

The transformer changes:

the amplitude of the voltage

When a step-up transformer is in use:

the secondary voltage is greater than the primary voltage

If two bar magnets suspended in space were brought together, what would happen?

they would rotate and attract

T/F Laminated transformer cores are more efficient than unlaminated ones.

true

T/F: Generators and motors both require commutators.

true

A transformer "transforms" or changes electric ___.

voltage

What is EMF (Electromotive force) expressed in?

volts

Hydrogen nucleus has an associated magnetic field?

yes

The voltaic pile consist of?

zinc and copper plates sandwiched together

If two magnets are brought together, north-to-north poles will ___, whereas north-to-south poles will ____.

north to north would repel north to south would attract

If DC is applied to the primary coil of a step-up transformer, what is the result in the secondary coil?

nothing

The electric current produced by an AC generator has:

Alternating positive and negative intensity

The device designed to measure electron flow in a conductor is known as an?

Ammeter

Theoretically, conduction electrons come to rest momentarily:

At zero crossing

What us the transformer that looks like a square donut called?

Closed-core

An autotransformer:

Contains a single coil that services as both primary and secondary coils

The fact that an electric current is induced if the conductor is in a changing mantic field is known as what law?

Faraday's law

One law of electromagnetic states that:

The induced current flows in the opposite direction of the inducing action

If a transformer produces a large secondary current from a small primary current:

The turns ratio will be less than 1

The main difference between an AC and DC Electric generator isL

The type of commutator rings

If a bar magnet were suspended in space and another bar of nonmagnetic material were brought close to it, what would happen?

nothing

A transformer operates:

on AC but not on DC

The magnetic field produced by an electromagnet has:

properties similar to a bar magnet

Which of the following is based on electromagnetic induction? - AC current - Battery - DC current - Radio reception - Solenoid

radio reception

What is an electromagnet?

a coil of wire wound around an iron core

Electric ranges, air conditioners, and furnaces require 220 V, 60 Hz AC. Therefore, compared with most household appliances, they require?

a higher electric potential

An electron moving in a conductor produces?

a magnetic field perpendicular to the conductor

A lodestone is an example of?

a natural magnet

An example of ferromagnetic material?

a natural magnet

An example of a magnetic domain is?

a nucleus

The term electromagnetic induction refers to the production of?

an electric current

Primary to secondary coupling in a transformer is enhanced by:

an iron core

When an AC source is connected to a coil of wire:

an opposite EMF is induced

Most magnets:

are attracted by another magnetic field

The earth's magnetic field is strongest:

at the poles

When iron is brought near a permanent magnet, the lines of the magnetic field are:

attracted to the iron

The principal application of a transformer in an x-ray imaging system is to:

change voltage

When the right-hand rule is applied to a straight wire, the thumb indicates the direction of the?

electric current

In an electric motor:

electric current is suppled to a coil of wire

The output current in a step-up transformer is:

lower than the input current

Transformers have iron cores to intensify the:

magnetic field

A physical property that we cannot sense?

magnetism

The magnetic field produced in a transformer is based on?

mutual induction


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