HW4 Nuclear Engineering

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Started on Tuesday, 3 March 2015, 03:05 PM

Completed on Monday, 9 March 2015, 07:55 PM

Time taken 6 days 4 hours

Grade 135.00 out of a maximum of 150.00 (90%)

Match the correct term and definitions. Not all terms will be used.

Material that conducts electricity, but offers

opposition to current flow.Resistors

Materials whose electrons are tightly bound to their

atoms and require large amounts of energy to free

them from the influence of the nucleus.

Insulators/ nonconductors

The type of flow when the direction of the positivecharges is in the opposite direction of the electron

flow.

Conventional current flow

The flow of electrons, from a random motion to a

more directional path through a wire.Current

A material with electrons that are loosely bound to

their atoms.Conductor

The correct answer is: Material that conducts electricity, but offers opposition to

current flow. – Resistors, Materials whose electrons are tightly bound to their atoms

and require large amounts of energy to free them from the influence of the nucleus. –Insulators/ nonconductors, The type of flow when the direction of the positive charg

is in the opposite direction of the electron flow. – Conventional current flow, The flow

of electrons, from a random motion to a more directional path through a wire. –

Current, A material with electrons that are loosely bound to their atoms. – Conducto

Given that current (I) = 4 amps and voltage (E) = 20 volts, find the circuit resistance (

Select one:

a. 10 ohms

b. 5 ohms

c. 15 ohms

d. 40 ohms

The correct answer is: 5 ohms

Match the correct term with its description. Not all terms will be used.

The process of movinig a conductor through a magnetic

field to produce a potential difference.Magnetic Induction

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Application of heat to the junction of two dissimilar

metals causing electrons to flow from one to the other.

Thermoelectricity

The placing of two electrodes in a vacuum and heating

one electrode causing electrons to flow.Thermionic Emission

The process of combining metals and chemicals to

produce electrical energy.Electrochemistry

The correct answer is: The process of movinig a conductor through a magnetic field to

produce a potential difference. – Magnetic Induction, Application of heat to the

junction of two dissimilar metals causing electrons to flow from one to the other. –

Thermoelectricity, The placing of two electrodes in a vacuum and heating one electro

causing electrons to flow. – Thermionic Emission, The process of combining metals a

chemicals to produce electrical energy. – Electrochemistry

Match the correct term and definitions. Not all terms will be used.

Ampere-turns per meter. Field intensity

Product of current and the number of turns of wire. Ampere- turns

Opposition to the creation of a magnetic field. Reluctance

Strength of a magnetic field in a coil of wire. Magnetomotive force

The correct answer is: Ampere-turns per meter. – Field intensity, Product of current

and the number of turns of wire. – Ampere-turns, Opposition to the creation of a

magnetic field. – Reluctance, Strength of a magnetic field in a coil of wire. –

Magnetomotive force

Match the description of the materials to the proper category.

Materials such as iron, steel, nickel, cobalt, and commercial

alloys, alnico, and peralloy, having high relative permability in

a range of 50 to 200.

Ferromagnetic

Materials such as aluminum, platnium, manganese and

chromium, having low relative permeability slightly more than

1.

Paramagnetic

Materials such as cooper, zinc, gold and silver, having very low

relative permeability slightly less than one.Diamagnetic

The correct answer is: Materials such as iron, steel, nickel, cobalt, and commercial

alloys, alnico, and peralloy, having high relative permability in a range of 50 to 200. –

Ferromagnetic, Materials such as aluminum, platnium, manganese and chromium,

having low relative permeability slightly more than 1. – Paramagnetic, Materials such

cooper, zinc, gold and silver, having very low relative permeability slightly less than o

– Diamagnetic

Changing the frequency of the magnetomotive force thousands of times per second in

coil can cause a loss of energy known as:


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Select one:

a. Permeability

b. Inductance

c. Reluctance

d. Hysteresis

e. Capacitance

The correct answer is: Hysteresis

According to Faraday's law, induced voltage is dependent on two factors. These facto

are:

Select one:

a. The current flow through the conductor and the times in which the conductor i

magnetized.

b. Length of the coil in the magnetic field and conductor normal operating

temperatures.

c. The number of turns of a coil and the rate in which the conductor cuts the lines

flux in the magnetic field.

d. Permeability of the magnetic material and the coil length of the conductor.

e. Magnetomotive force of the magnetic field and the size of the conductor in the

magnetic field.

The correct answer is: The number of turns of a coil and the rate in which the conduct

cuts the lines of flux in the magnetic field.

If an induced voltage is created within a conductor, Lenz's Law tells us that:

Select one:

a. This voltage wil not be affected by the magnetic field size.

b. The voltage will be in the same direction as the magnetic field.

c. The voltage will be constant until the magnetic field collapses, at which time th

voltage will drop to zero.

d. The current will be in the same direction as the magnetic field.

e. The current from the induced voltage will oppose the magnetic field that cause

it.

The correct answer is: The current from the induced voltage will oppose the magnetic

field that caused it.


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Match the electrical component name with its symbol shown.

Capacitor 3

Breaker 11

Contacts 10

Inductor 5

Relay 9

Resistor 1

The correct answer is: Capacitor – 3, Breaker – 11, Contacts – 10, Inductor – 5, Relay

9, Resistor – 1

The purpose of a rectifier is to convert:

Select one:

a. DC to AC current


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b. Amps to power

c. Volts to watts

d. AC to DC current

e. Electrostatic field to sine waves

The correct answer is: AC to DC current

A rectifier circuit that uses a single diode to produce a current flow through the circuonly during one half of the input voltage cycle is a:

Select one:

a. Full-wave rectifier

b. Series rectifier

c. Half-wave rectifier

d. Half-voltage rectifier

e. Single rectifier

The correct answer is: Half-wave rectifier

Match the term to its definition.

A break in a circuit occurs, preventing a

complete path for current to flow. Open circuit

Uninterrupted path for current from the

source, through the load, and back to

the source.

Closed circuit

A circuit which offers very littleresistance to current flow.

Short circuit

A measure of the re sistance a material

imposes on current flow.Resistivity

The amount of change of the resistance

of a material for a given change in

temperature.

Temperature coefficient of resistance

The correct answer is: A break in a circuit occurs, preventing a complete path for

current to flow. – Open circuit, Uninterrupted path for current from the source,

through the load, and back to the source. – Closed circuit, A circuit which offers very

little resistance to current flow. – Short circuit, A measure of the resistance a materia

imposes on current flow. – Resistivity, The amount of change of the resistance of a

material for a given change in temperature. – Temperature coefficient of resistance

The diagram below is an example of an OPEN circuit.


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Select one:

True

False

The correct answer is 'True'.

What is the purpose of a voltage divider?

Select one:

a. Provides multiple currents from multiple energy sources.

b. Provides a single voltage from a single energy source.

c. Provides a single voltage from multiple energy sources.

d. Provides a constant current from multiple energy sources.

e. Provides multiple voltages for a single energy source.

The correct answer is: Provides multiple voltages for a single energy source.

What is determined during performance of current divison?

Select one:

a. The current flow through the each resistor of a series circuit.

b. The current f low through the power source to a circuit.

c. The current flow through the capacitors in a series circuit.

d. The current flow through the each resistor of a voltage divider.

e. The current flow through the each leg of a parallel circuit.

The correct answer is: The current flow through the each leg of a parallel circuit.

An inductor will oppose a change in current flow by the counter electromotive f orce

induced when the field __________ or __________.

Select one:

a. collapses, dissipates

b. open, closes

c. expands, strengthens

d. discharges, collapses

e. collapses, expands

The correct answer is: collapses, expands


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What device is constructed of two metal plates, separated by a dielectric?

Select one:

a. Inductor

b. Battery

c. Generator

d. Capacitor

e. Resistor

The correct answer is: Capacitor

What device stores energy in the f orm of an electrical field caused by the attraction o

the of the positively charged particles in one plate, to the negatively charged particles

the other place?

Select one:

a. Integrated circuit

b. Capacitor

c. Resistord. Transistor

e. Inductor

The correct answer is: Capacitor

Which is best described by the following statement?

"Since the charges on the opposing plates are attracted by one another, they will oppo

any changes in charge."

Select one:

a. How a capacitor charges itself.

b. How a capacitor opposes a change in voltage.

c. How a capacitor causes voltage to increase.

d. How a capacitor discharges itself.

The correct answer is: How a capacitor o pposes a change in voltage.

What type of field is produced by current flow through an inductor?

Select one:

a. Vector

b. Magnetic

c. Voltage

d. Mechanical

e. Reactive

The correct answer is: Magnetic

Match the correct term and definition.


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A combination of materials used to convert chemical energy to

electrical energy.Voltaic cell

Solution capable of conducting an electric current. Electrolyte

Ratio comparing to the weight of any liquid to an equal volume

of water.Specific gravity

Metal or metallic compound having an abundance of electrons

or protons.

Electrode

Formed from two or more voltaic cells. Battery

The correct answer is: A combination of materials used to convert chemical energy to

electrical energy. – Voltaic cell, Solution capable of conducting an electric current. –

Electrolyte, Ratio comparing to the weight of any liquid to an equal volume of water.

Specific gravity, Metal or metallic compound having an abundance of electrons o r

protons. – Electrode, Formed from two or more voltaic cells. – Battery

Battery charging voltage should be limited to 2.3 volts per cell to:

Select one:

a. Prevent lead-plate breakdown during charging

b. Prevent shorting of cells

c. Minimize heat generation during charging

d. Prevent overcharging of cells

e. Minimize gas generation during charging.

The corre ct answer is: Minimize gas generation during charging.

During charging, current flow through the battery causes the electrolysis of water

thereby resulting in:

Select one:

a. Heat generation in the battery

b. Capacity loses in a voltaic cell

c. Ground faults in the reactance cell

d. Voltage drops in the load terminals

e. Capacitive reactance during charging

The correct answer is: Heat generation in the battery

To minimize gassing of batteries during charging, you should:

Select one:

a. increase total electrolyte content during charging.

b. supply charging voltages of 10 volts per cell to rapidly charge the batte ry.

c. limit charging voltage to 2.3 volts per cell or less.

d. decrease total electrolyte content during charging.


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e. limit charging amps to 3 amps per cell or less.

The correct answer is: limit charging voltage to 2.3 volts per cell or less.

A potential difference is produced in a simple voltaic cell by immersing two electrode

of _________ types of metal in an electrolyte.

Select one:

a. Same

b. Diff erent

The correct answer is: Different

The specific gravity of the electrolyte _________ as a lead-acid battery discharges.

Select one:

a. Increases

b. Decreases

The correct answer is: Decreases

The output voltages of a battery with cells connected in _________ is equal to the s

of the cell voltages.

Select one:

a. Series

b. Parallel

The correct answer is: Series

A battery with cells connected in parallel has a __________ current carrying capaci

than a series connected battery.

Select one:

a. lesser

b. greater

The correct answer is: greater

This is a simple voltage divider. AB Voltage is U-in. In points C and D the output

Voltage= U-out. What is the ratio R1/R2 to make U-out n-times less than U-in ?


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Select one:

a. n+1

b. 2n

c. n-1

d. 2n+3

The correct answer is: n-1

The total capacitance of 2 Capacitors is C=0.01 μF. The direct voltage applied to the

system is U=100V. Find the leaking current thorough the system if specific resistance

material is ρ=1011 Ω*m/m2, and dielectric constant is ξ =6 for both Capacitors. Give t

answer in μA. ( Yes, you need to perform calculations, before answering)

Select one:

a. 0.2

b. 0.02

c. 0.5

d. 0.1

The correct answer is: 0.2

Electrical circuit is given on the picture below. Resistance R is measured by 2 ways a)

and b) by applying the same Voltage on points C and D. In case a) the Voltmeter

indicates Ua=190V and Ammeter Ia=0.9A. In case b) the Voltmeter indicates Ub=170

and Ammeter Ib=2A. Using measurements find Resistance R?


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Select one:

a. 90 Ω

b. 50 Ω

c. 80 Ω

d. 100 Ω

The correct answer is: 90 Ω

Capacitor C=200ϻF is charged with U=150V and connected with 2 resistors R1=50Ω

and R2=25 Ω. How much heat will be released o n resistance R1 when capacitor fully

discharged?

Select one:

a. 9 J

b. 10 J

c. 5 J

d. 1.5 J

The correct answer is: 1.5 J

Electrical car with mass m=3200kg is moving with speed v=36 km/s. and continue

speeding up with acceleration a=0.5 m/c2 . Electrical motor requires current I=150A

from battery with voltage U=120V. What is efficiency of such a motor?

Select one:

a. 89 %

b. 79 %

c. 95 %


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d. 70 %

The correct answer is: 89 %

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HW4 Nuclear Engineering