Int 101 DC fundamentals Final
If the leads of a 17.5-volt battery were connected between different points in the circuit, it would indicate that point B to C would have 16 V. a. True b. False
b. False
In a series circuit, the total current flow is equal to the sum of the currents through all of the circuit branches. a. True b. False
b. False
In an automobile, the positive terminal of the battery is grounded to the frame, or chassis, of the vehicle. a. True b. False
b. False
Silver-zinc is a primary cell containing a zinc negative plate and a silver oxide positive plate. a. True b. False
b. False
The product- over- sum formula can be used only when all the resistors in the circuit are of equal value. a. True b. False
b. False
To solve the unknown values in a parallel circuit, use series circuit rules for those sections of the circuit that are connected in parallel circuit. a. True b. False
b. False
When testing the installation for grounds using the MEGGER, the conductor should be tested at the rated voltage or slightly lower. a. True b. False
b. False
How many volts does it take to push 2 amperes of current through 20 ohms of resistance? a. 10 b. 22 c. 40 d. 0.1
c. 40
o test wire insulation, a special type of ohmmeter called a(n) _____ is used. a. ammeter b. voltmeter c. MEGGER d. wattmeter
c. MEGGER
What is the most common method of producing electricity? a. light b. chemicals c. magnetism d. friction
c. magnetism
Piezoelectricity refers to electricity produced by some materials when they are subjected to _____. a. sunlight b. heat c. high temperatures d. pressure
d. pressure
What can be found when a combination circuit has been reduced to a simple parallel circuit? a. total voltage b. total circuit c. total current d. total resistance
d. total resistance
What is the formula R = E/I used to calculate? a. value of wattage b. value of current c. value of voltage d. value of resistance
d. value of resistance
Resistors functioning as _____ are used in applications involving field-effect transistors (FETs) and multirange voltmeter circuits. a. voltage multipliers b. current multipliers c. current dividers d. voltage dividers
d. voltage dividers
The Greeks were the first to discover electricity about____ years ago. a. 1000 b. 5000 c. 100 d. 2500
d. 2500
When reading a meter, which is the first step? a. Read the meter. b. Determine what the meter indicates. c. Calculate the resistor value. d. Determine the full-scale value of the meter.
b. Determine what the meter indicates.
What meter measures true power in a circuit? a. ammeter b. wattmeter c. voltmeter d. ohmmeter
b. wattmeter
When using a dry copy machine, a dark powder that has what charge is applied to the drum? a. negative charge b. grounding charge c. no charge d. positive charge
a. negative charge
Direct current is described as _____. a. unidirectional b. bidirectional c. omnidirectional
a. unidirectional
There are two theories concerning current flow, electron flow theory and conventional current flow theory. a. True b. False
a. True
Refer to the diagram above. At what junction point does the current split? a. R3 and Point B b. R2 and R3 c. Point A and R1 d. R1 and R2
b. R2 and R3
Any time an electric current flows through what component is a magnetic field created around the conductor? a. semiconductor b. conductor c. electron d. molecule
b. conductor
What would a truck carrying flammable materials use to avoid dangerous conditions due to static charges? a. lightning rod b. drag chain c. lightning arrestor d. insulator
b. drag chain
If a thundercloud has a positive charge and the object on the ground has a negative charge, the current in the lightning bolt will flow from the _____. a. cloud to the ground b. ground to the cloud
b. ground to the cloud
The three substances that form natural magnets are _____. a. iron, boron, and cobalt b. iron, nickel, and cobalt c. copper, iron, and cobalt d. copper, nickel, and boron
b. iron, nickel, and cobalt
What can be adjusted to provide any value of voltage between 12 and 0 volts? a. voltmeter b. wiper c. multiturn variable resistor d. rheostat
b. wiper
What force is demonstrated in objects with unlike charges? a. repulsion b. attraction
b. attraction
What force is demonstrated in objects with like charges? a. attraction b. repulsion
b. repulsion
A drag chain is attached to the frame of a vehicle and the other end drags the ground. a. True b. False
a. True
A four current-carrying conductor in a raceway needs to be adjusted. What is the percent of value as adjusted for ambient temperature? a. 70 b. 80 c. 45 d. 35
b. 80
If there are more than _____ conductors in a raceway, the ampacity of the conductors must be derated. a. two b. three c. four d. six
b. three
In a nickel-cadmium battery, what is used to increase conductivity? a. nickel b. cadmium c. graphite d. paper
c. graphite
If current is flowing in a circuit containing an inductor and the power switch is opened, the magnetic field surrounding the inductor collapses and induces voltage into the inductor, resulting in a voltage spike. a. True b. False
a. True
A model states that electrons exist in specific orbits around the nucleus and the orbit in which the electron exists is determined by the electron's mass times its speed times the radius of the orbit. Which model is this? a. Gilbert model b. Bohr model c. Thomson model d. Dalton model
b. Bohr model
The d'Arsonval meter movement is operated by applying _____ current to the coil. a. AC b. DC
b. DC
What are commonly used to perform two functions in a circuit? a. voltage dividers b. resistors c. rheostats d. tolerances
b. resistors
is a schematic symbol for a fixed resistor. a. True b. False
b. False
On the Ohm's law chart, what do you use to find power when current and voltage are known? a. R = P/I2 b. I = E/R c. P = E*I d. I = P/E
c. P = E*I
A lightning protection device that is grounded at one end, with the other end close to but not touching the object to be protected, is called a lightning _____. a. umbrella b. rod c. arrestor d. catcher
c. arrestor
The amount of voltage produced by an individual _____ is determined by the materials from which it is made. a. anode b. cathode c. cell d. electrode
c. cell
There is an ambient temperature of 40°C with a temperature rating of the conductor as 90°C. What is the ambient temperature correction factor based on 86°F? a. 1.15 b. 1.00 c. 0.29 d. 0.91
d. 0.91
An electrical circuit has a voltage of 50 V and a resistance of 5 Ω. What is the value of current? a. 45 A b. 55 A c. 250 A d. 10 A
d. 10 A
A parallel circuit is composed of two 60 Ω resistors. What is the total resistance? a. 1 Ω b. 3600 Ω c. 120 Ω d. 30 Ω
d. 30 Ω
A parallel circuit is composed of a 10 Ω and a 22 Ω resistor. It has a voltage of 60 V. What is the current in the 10 Ω resistor? a. 5 A b. 1.88 A c. 2.73 A d. 6 A
d. 6 A
Which theory states that current flow is produced when an electron from one atom knocks electrons of another atom out of orbit? a. Seebeck theory b. Striking theory c. Bohr theory d. Bump theory
d. Bump theory
When a conductor cuts magnetic lines of force, a voltage is induced into the conductor. This principle is called _____. a. magnetic inductance b. electromagnetic inductance c. electric induction d. electromagnetic induction
d. electromagnetic induction i guess
What type of resistors can only have one ohmic value? a. composition b. variable c. metal film d. fixed
d. fixed
What standard prefix in engineering notation indicates multiplication by 1,000,000,000? a. mega (M) b. kilo (K) c. tera (T) d. giga (G)
d. giga (G)
In a variable resistor with three terminals, where is the wiper arm? a. with the center terminal b. on the case c. outside the case d. inside the case
d. inside the case
A voltmeter has a very _____ resistance connected in series with the meter movement. a. high b. low
a. high
A circuit that has only one path for current flow is a _____ circuit. a. series b. parallel
a. series
What is another term for electromotive force (EMF)? a. ohmage b. voltage c. wattage d. amperage
b. voltage
The ampacities listed in Table 310.15(B)(16) are based on an ambient temperature of _____. a. 30°F b. 194°F c. 86°F d. 140°F
c. 86°F
is a schematic symbol for a variable resistor. a. True b. False
a. True
Which is the accepted symbol that represents a chassis ground? a. b.
b.
Which of the following formulas is the general voltage divider formula? a. b. c. d.
b.
Which of the following is the current divider formula? a. b. c. d.
b.
Which of the following represents the formula for product over sum? a. b. c. d.
b.
If a permanent magnet is cut into pieces, each piece _____ a separate magnet. a. is not b. is
b. is
A(n) _____ ammeter operates on more than one range by connecting the meter movement to different shunts. a. omnirange b. multirange c. full-scale d. single-range
b. multirange
Engineering schematics use symbols to represent the use of a resistor. a. True b. False
b. False
In a parallel circuit, the current is the same at any point in the circuit. a. True b. False
b. False
The silver-zinc cell develops a voltage of 1.35 volts. a. True b. False
b. False
Which formula can be used to calculate the current flow in a parallel circuit? a. b. c. d.
c.
What is the nonconductive covering around a wire? a. raceway b. conductor c. insulation d. duct bank
c. insulation
A way of determining the relationships of the motion of the conductor, the magnetic field direction, and the direction of the induced current is by using the _____. a. left-hand motor rule b. right-hand motor rule c. left-hand generator rule d. right-hand generator rule
c. left-hand generator rule
In a parallel circuit, the total resistance is _____ value resistor. a. equal to the lowest b. larger than the lowest c. less than the lowest d. equal to the largest
c. less than the lowest
Which type of fuel cells are being developed for natural gas and coal-fired power plants? a. solid oxide fuel cells b. polymer electrolyte membrane fuel cells c. molten carbonate fuel cells d. phosphoric acid fuel cells
c. molten carbonate fuel cells
The more discharged a lead-acid battery becomes, the more _________ is formed in the electrolyte and the lower the specific gravity reading becomes. a. power b. acid c. water d. lead
c. water
What type of fixed resistor is made by winding a piece of resistive wire around a ceramic core? a. metal film b. carbon film c. wire-wound d. metal glaze
c. wire-wound
Which of the following is an example of an insulator? a. silk b. water c. wood d. sealed wax
c. wood
An electric motor is running on 120 V. The current is measured to be 2 A. How many ohms of resistance is the motor? a. 118 b. 122 c. 240 d. 60
d. 60
What is a measure of the amount of acid contained in water? a. specific gravity b. specific resistance c. relative resistance d. relative gravity
a. specific gravity
An inductor is basically an electromagnet that changes its polarity at regular intervals. a. True b. False
a. True
Copy machines operate on the principle of static electricity. a. True b. False
a. True
Recording meters can show the amount of voltage or current, its duration, and the time of occurrence. a. True b. False
a. True
In engineering notation, what is the third prefix below the base unit known as? a. micro b. nano c. pico d. milli
b. nano
If a circuit is open, current _____ flow. a. will b. will not
b. will not
A precipitator is a type of _____. a. power supply b. small wire c. lightning rod d. air filter
d. air filter
Copper and brass are examples of ____________ materials. a. paramagnetic b. ferromagnetic c. ceramic d. diamagnetic
d. diamagnetic
Platinum, titanium, and chromium are examples of ___________ materials. a. ferromagnetic b. diamagnetic c. permanent d. paramagnetic
d. paramagnetic
Earth contains magnetic poles. a. True b. False
a. True
Sometimes static charges are a nuisance. a. True b. False
a. True
The amount of power (W) used by each resistor can be found by using Ohm's law. a. True b. False
a. True
The grounding prong of a plug should never be cut off or bypassed. a. True b. False
a. True
Using the SI system, the amount of substance is known as a unit of mole. a. True b. False
a. True
Engineering notation is in steps of what? a. 10000 b. 1000 c. 10 d. 100
b. 1000
What law states that the force of electrostatic attraction or repulsion is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them? a. Volt's Law b. Coulomb's Law c. Ohm's Law d. Ampere's Law
b. Coulomb's Law
What is a coil wound on a nonmagnetic core material, such as wood? a. eddy current b. air-core inductor c. iron-core inductor d. hysteresis
b. air-core inductor
Which measuring instrument has the advantage of not requiring the use of batteries for measuring voltage? a. wattmeter b. ammeter c. voltage tester d. oscilloscope
b. ammeter
What meter measures an amount of voltage during a period of time and produces a two-dimensional image? a. a bridge circuit b. an oscilloscope c. a Wheatstone bridge d. a low-impedance voltage tester
b. an oscilloscope
A test meter that uses a scale and pointer to indicate values is a(n) _____ meter. a. digital b. analog
b. analog
Which type of materials can be powdered and mixed with rubber, plastic, or liquids? a. ferromagnetic b. ceramic c. diamagnetic d. paramagnetic
b. ceramic
A point that is used as a common connection for other parts of a circuit not actually driven into the ground is called a _____ ground. a. ground b. chassis c. supply d. circuit
b. chassis
The term "load" refers to the amount of _____ in a circuit branch. a. resistance b. current c. voltage d. wattage
b. current
If an object is placed in the field of a strong electromagnet connected to an AC line, the object will be _____. a. magnetized b. demagnetized
b. demagnetized
The unit circular mil is equal to the _____. a. diameter of the wire in mils b. diameter of the wire in mils squared c. radius of the wire in mils d. radius of the wire in mils squared
b. diameter of the wire in mils squared
Magnetic lines of force are referred to as _____. a. reluctance b. flux c. spin d. bands
b. flux
What circuit does the above image represent? a. series b. parallel c. combination
b. parallel
Solving combination circuits includes a step in which you _____. a. expand the circuit to a more complex circuit b. reduce the circuit to a simpler circuit c. enlarge the circuit to several combination circuits d. eliminate all parallel paths
b. reduce the circuit to a simpler circuit
Which of the following contains four valence electrons and is characterized by the fact that as it is heated, its resistance decreases? a. conductor b. semiconductor c. electron d. insulator
b. semiconductor
To what can this circuit be reduced? a. simple series circuit b. simple parallel circuit c. complex series circuit d. complex parallel circuit
b. simple parallel circuit
What are recording meters used to detect? a. circuit power b. spike voltages c. AC meter movement d. DC meter movement
b. spike voltages
The ambient air temperature considered in relation to a conductor ampacity is the temperature of the _____. a. conductor b. surrounding air c. raceway d. insulation
b. surrounding air
An alkaline-manganese C cell size has 4.9 watt-hours per cubic inch. a. True b. False
b. False
The oscilloscope measures current, resistance, or watts. a. True b. False
b. False
Find the resistance of a piece of 12 AWG aluminum wire that is 550 ft long. Assume a temperature of 20°C. a. 0.876 b. 0.293 c. 1.432 d. 15.023
c. 1.432
A three-resistor circuit has a total power of 25 W. Two of the resistors dissipate 10 W and 5 W, respectively. How much power does the third resistor dissipate? a. 15 W b. 25 W c. 10 W d. 2 W
c. 10 W
When a resistive wire has a total value of ______ ohms, the resistor can be set between the values of 0 and 100 ohms. a. 0 b. 1000 c. 100 d. 10
c. 100
What causes a static charge in a clothes dryer? a. not using a grounding plug b. adding a dryer sheet c. clothes moving through the dry air d. using too high of a heat setting
c. clothes moving through the dry air
What type of fixed resistor is made from a compound of carbon graphite and resin bonding material? a. metal glaze b. wire-wound c. composition carbon d. metal film
c. composition carbon
The angular difference between true north and magnetic north is known as the angle of _____. a. magnetism b. retribution c. declination d. polarity
c. declination
The regions formed in the molecular structure of magnetic metals are sometimes called magnetic _____. a. spins b. quarks c. domains d. atoms
c. domains
Most voltmeters are _____ voltmeters, meaning they are designed to use one meter movement to measure several ranges. a. full scale b. single range c. multirange d. omnirange
c. multirange
In a one- terminal zero-center voltmeter connected to ground and the probe connected to a Point A, the pointer of the voltmeter gives a ________ indication for voltage. a. positive b. stabilizing c. negative d. neutralizing
c. negative
What insulates an automobile? a. grounding wire b. chassis c. rubber tires d. Earth
c. rubber tires
The semiconductor material used as a coating on copy machine drums is _____. a. germanium b. aluminum c. selenium d. silicon
c. selenium
How many color bands are used on resistors that have a tolerance of ±20%? a. four b. five c. three d. six
c. three
When using the left-hand generator rule, the thumb points to the direction of _____. a. current b. power c. thrust d. flux
c. thrust
How many electrons can be contained in any one orbit, or shell? a. (3N2) b. (1N2) c. (2N)2 d. (2N2)
d. (2N2)
A series circuit has a total resistance of 180 Ω and an applied voltage of 120 V. What is the current flow? a. 300 A b. 1.5 A c. 60 A d. 0.667 A
d. 0.667 A
One coulomb per second is equal to one _____. a. volt b. ohm c. watt d. ampere
d. ampere
What should be used to solve the unknown values in a combination circuit? a. combination circuit rules b. parallel circuit rules c. series circuit rules d. both series circuit rules and parallel circuit rules
d. both series circuit rules and parallel circuit rules
The LeClanché cell is also known as a(n) _____ cell. a. nickel-cadmium b. silver zinc c. alkaline d. carbon-zinc
d. carbon-zinc
The meter is only connected to one of the lines supplying power when using a(n) _____ ammeter. a. shunted b. d'Arsonval c. Ayrton d. clamp-on
d. clamp-on
There is very little resistance and a large amount of current flows in a(n) _____ circuit. a. open b. long c. closed d. short
d. short
There are six current-carrying conductors in a raceway that is to be installed in an area with an ambient temperature of 90°F. It is necessary to _____. a. derate because of the number of conductors in the raceway only b. apply a correction for the ambient temperature only c. make no corrections or derates d. correct for temperature and derate (because of the number of conductors)
d. correct for temperature and derate (because of the number of conductors)
Electrostatic charges occur on _____. a. insulators b. conductors
a. insulators
Which of the following is also called an Edison battery? a. nickel-iron b. nickel-metal hydride c. ithium-ion d. nickel-cadmium
a. nickel-iron
The static charge sometimes used during spray painting is an example of a(n) _____ static charge. a. useful b. nuisance
a. useful
The unit of resistance to current flow is the _____. a. volt b. watt c. ampere d. ohm
d. ohm
The low-impedance voltage tester is most suitable for use in _____. a. high-power circuits b. low-power circuits c. low-voltage circuits d. circuits that have low impedance
a. high-power circuits
What contains seven or eight valence electrons? a. insulator b. electron c. conductor d. semiconductor
a. insulator
In spray painting, the object to be painted has what ___________ charge? a. negative charge b. no charge c. grounding charge d. positive charge
a. negative charge
How many bases does the SI system use? a. seven b. five c. six d. eight
a. seven
What part of an atom has no charge? a. neutron b. quark c. electron d. proton
a. neutron
Most of the electric power in the world is produced by alternators. a. True b. False
a. True
What type of cell cannot be recharged? a. secondary b. primary
b. primary
What type of cell can be recharged? a. primary b. secondary
b. secondary
What force pushes the electrons through a resistance in a circuit? a. inductance b. voltage c. current d. potential
b. voltage
In a speaker, when the electromagnet has a south polarity, it is repelled from the permanent magnet. a. True b. False
b. False
Refer to the diagram above. Through what must all the current in the circuit flow? a. R3 b. R2 c. R1 d. Point B
c. R1
A junction point of current paths is often called a _____. a. circuit b. combination c. node
c. node
The amount of energy a cell can deliver is called its _____ capacity. a. lithium b. carrying c. volt d. current
d. current
The north magnetic pole of a compass needle is attracted to the _____ magnetic pole of the earth. a. east b. west c. north d. south
d. south
The valence shell of an atom is the ____ shell. a. inner b. middle c. bottom d. outer
d. outer
The atomic number of an element is the number of ______ in the nucleus. a. neutrons b. electrons c. quarks d. protons
d. protons
In the combination circuit above, which two paths are parallel? a. R1 and R2, R3 and R4 b. R1 and R3, R2 and R4 c. R1 and R2 d. R1 and R3
a. R1 and R2, R3 and R4
A voltage _____ is used to provide different voltages between certain points in a circuit. a. divider b. scalar c. doubler d. multiplier
a. divider
To symbolize a ground point made by physically driving an object such as a rod or pipe into the ground, a(n) _____ ground symbol is used. a. earth b. supply c. chassis d. circuit
a. earth
What is the maximum current (amperes) that should be applied when charging an 80-ampere-hour battery? a. eight b. twelve c. six d. ten
a. eight
Insulators are the only materials that can hold _____ stationary. a. electrons b. elements
a. electrons
What type of fixed resistor is made by applying a film of metal to a ceramic rod in a vacuum? a. metal film b. wire-wound c. composition carbon d. metal glaze
a. metal film
The precipitator uses a high-voltage DC power supply to provide a set of wires with a positive charge and a set of plates with a _____ charge. a. negative b. positive c. neutral
a. negative
Wire installations are generally tested for shorts and grounds. a. True b. False
a. True
What generally ranges from 3 turns to 10 turns? a. potentiometer b. multiturn variable resistor c. variable resistor d. rheostat
b. multiturn variable resistor
In a circuit, it is assumed the current flows from the negative terminal of a battery to the positive terminal. This means that Point A would be connected to the __________ battery terminal. a. neutral b. negative c. grounded d. positive
b. negative
In the above combination circuit, because R1 and R2 are connected in series, their values can be added to form __________. a. one equivalent circuit b. one equivalent resistor c. one equivalent voltage d. one equivalent current
b. one equivalent resistor
An electric circuit has a resistance of 20 Ω. The current is measured to be 6 A. How many volts are applied to the circuit? a. 14 b. 3 1/3 c. 26 d. 120
d. 120
The greater the difference in the number of electrons between the negative and positive terminals, the greater the what? a. force of repulsion and attraction b. force of attraction only c. force of repulsion only d. force or orbit
a. force of repulsion and attraction
To perform a load test on a lead-acid battery, the amount of test current should be _____ times the ampere-hour capacity. a. three b. five c. two d. four
a. three
One of the rules for Ohm's law when finding values of voltage, current, resistance, and power in a series circuit is that the current is the same at any point in the circuit. a. True b. False
a. True
Resistors have a power rating in watts that should not be exceeded, or the resistor will be damaged. a. True b. False
a. True
How can a person generally eliminate the accumulation of static charge in the home, especially when carpet exists? a. Install a dehumidifier. b. Install a humidifier. c. Use a carpet pad as an insulator. d. Use a lightning rod. Hide Feedback
b. Install a humidifier.
Selenium is a(n) _____. a. insulator b. semiconductor c. conductor
b. semiconductor
What is the flow of electrons through a conductive substance? a. wattage b. cycle c. voltage d. current
d. current
An atom of iron contains how may electrons? a. 8 b. 4 c. 22 d. 26
d. 26
In bump theory, what happens to the striking electron's energy? a. Its energy increases. b. Its energy evaporates. c. It gives its energy to the valence electron. d. It gives its energy to the electron being struck.
d. It gives its energy to the electron being struck.
Assume a current of 1 ampere enters a parallel circuit at Point A. This 1 ampere of current will ________________ between Resistors R1 and R2 and then recombine at Point B. a. subtract b. add c. multiply d. divide
d. divide
Losses in the core of iron core inductors include _____ and _____ losses. a. resistive; inductive b. hysteresis; inductive c. reactive; inductive d. eddy current; hysteresis
d. eddy current; hysteresis
Several cells connected together that produce voltage are called a _____. a. battery b. voltage stack c. primary cell d. secondary cell
a. battery
When electrons form a spin pattern, this _____________ the magnetic field of the material. a. cancels b. increases c. neutralizes d. decreases
a. cancels
An increase in _____, not resistance, results in an increase of load. a. current b. wattage c. voltage d. power
a. current
In series circuits, the _____ is the same at any point in the circuit. a. current b. resistance c. voltage drop
a. current
n standard metric prefixes, what is the first step above the base unit? a. deka b. centi c. kilo d. hecto
a. deka
When using the oscilloscope, which control adjusts the brightness of the trace? a. intensity b. focus c. probe adjust d. beam finder
a. intensity
Bringing a charged test object near the ball of a charged electroscope causes the leaves to move closer together. This indicates that the test object charge is the _____ polarity as the electroscope charge. a. opposite b. same
a. opposite
By observing the direction of current flow through the circuit, voltage _____ can be determined. a. polarity b. drop
a. polarity
Which has more inductance? a. more windings b. less windings
a. more windings
A semiconductor contains _____ valence electrons. a. five b. four c. seven d. three
b. four
A square horseshoe magnet contains magnetic wire wound around a center core. a. True b. False
b. False
All four components of a bridge circuit are of different types, such as resistors, inductors, and capacitors. a. True b. False
b. False
When a resistor has a power rating of ½ watt and the amount of heat being dissipated is 1 watt, the resistor will not be damaged. a. True b. False
b. False
In the MKS or SI system, 1 ampere-turn equals how many gilberts? a. 1.256 b. 0.1555 c. 1.256637 d. 0.7905
c. 1.256637
When a voltage is induced in a coil and there is a complete circuit, current flows through the coil. a. True b. False
a. True
When the values of I1 and R1 are substituted for IX and RX, it becomes the current divider formula. a. True b. False
a. True
Which formula represents finding the applied voltage using Ohm's law? a. b. c. d.
a.
The voltage tester can generally be used to measure voltages up to how many volts? a. 600 b. 1400 c. 400 d. 1200
a. 600
During the period of time known as the first time constant of an exponential curve, the current will rise to about _____ percent of its full value. a. 63.2 b. 31.8 c. 100 d. 50
a. 63.2
How many feet would a 10-MHz signal travel through a conductor with a velocity factor of 0.66 during one AC cycle? a. 69.944 b. 6.6 c. 6.9944 d. 0.66
a. 69.944
A voltage that is positive with respect to ground is a(n) _____ voltage. a. above-ground b. below-ground
a. above-ground
The alternative formula used to determine the proper size wire for most installations needs a value for TA. What does TA stand for? a. ambient temperature b. total ampere c. ampere temperature d. total ambient
a. ambient temperature
What meter measures resistance? a. an ohmmeter b. a wattmeter c. an ammeter d. a voltmeter
a. an ohmmeter
In parallel circuits, the voltage drop across any branch is the same as the _____. a. applied voltage b. resistance c. current
a. applied voltage
There are two conductors, a red and a blue, installed in metallic conduit. You are using a MEGGER to test for grounds. How should you connect the two leads of the MEGGER? a. both a and b above b. one to the red lead and one to the conduit c. one to the blue lead and one to the conduit d. one to the blue lead and one to the red lead
a. both a and b above
Which of the following would flux not lines not pass through so well? a. copper b. soft iron c. silicon d. steel
a. copper
Magnetism can be explained in terms of _____ spin patterns. a. electron b. neutron c. quark d. proton
a. electron
It is often necessary to know the ________ of the voltage dropped across a resistor? a. polarity b. resistance c. current d. voltage
a. polarity
Materials that increase their resistance with an increase in temperature have a _____ coefficient of temperature. a. positive b. negative
a. positive
Lightning rods provide an easy path to ground for current to flow. a. True b. False
a. True
Lithium cells can have voltages that range from 1.9 volts to 3.6 volts. a. True b. False
a. True
Most ohmmeters operate with a maximum voltage that ranges from 1.5 volts to about 9 volts. a. True b. False
a. True
One factor that determines inductance is how far the windings are separated from each other. a. True b. False
a. True
The amount of voltage induced into a conductor depends on the turns of wire, the strength of the magnetic field, and the speed of the cutting action. a. True b. False
a. True
To calculate the amount of current flow through a resistor using the current divider formula, you need to know the values of the resistor, total resistance for the circuit, and total current of amperes flow. a. True b. False
a. True
Tracing the current path in a combination circuit will identify the series and parallel elements. a. True b. False
a. True
When a current of 1 ampere enters a parallel circuit at Point B, it will increase the current between resistors R1 and R2. a a. True b. False
a. True
n the above image, the magnet is moved toward the coil. What happens to the magnetic field around the coil? a. It collapses inward of the coil, inducing a voltage in the coil. b. It collapses outward of the coil, inducing a voltage in the coil. c. It expands inward of the coil, inducing a voltage in the coil. d. It expands outward of the coil, inducing a voltage in the coil.
d. It expands outward of the coil, inducing a voltage in the coil.
Which of the following is an example of a nuisance static charge? a. spray painting b. lightning c. a copy machine d. an automobile moving through dry air
d. an automobile moving through dry air
What meter must NEVER be connected to a circuit when the circuit power is turned on? a. an ammeter b. a wattmeter c. a voltmeter d. an ohmmeter
d. an ohmmeter
In determining the resistance of a length of wire, which conductor will have less resistance than an aluminum conductor of the same size and length? a. silver b. tungsten c. gold d. copper
d. copper
To __________ an object, place the object in the field of a strong electromagnet connected to an AC line. a. charge b. weaken c. magnetize d. demagnetize
d. demagnetize
Iron, nickel, cobalt, and manganese are examples of ___________ materials. a. permanent b. paramagnetic c. diamagnetic d. ferromagnetic
d. ferromagnetic
If the wiper is moved to the bottom of the resistor, the voltmeter will indicate a value of how many volts? a. 0 b. 10 c. 12 d. 6
a. 0
if a switch is open what is the resistance a. 0 b. max c.min d. infinite
d. infinite
An inductor has a maximum current flow of 1.25 amperes. When power is first applied to the inductor, how much current will flow at the end of the fourth time constant? a. 1.1875 A b. 1.226 A c. 1.24 A d. 2.37 A
b. 1.226 A
What is the terminal voltage of a nicad battery containing six cells? a. 13.2 V b. 7.2 V c. 6.6 V d. 9 V
b. 7.2 V
When calculating for resistance, what values are needed? a. CM, RCA, K, L b. CM, K, L, R c. TC, TA, RCA d. TC, K, L, R
b. CM, K, L, R
Which formula is used to calculate voltage drop across each resistor using Ohm's law? a. b. c. d.
c.
A toaster is listed as 1560 W. When it is plugged into a 120 V circuit and starts to make toast, how many amperes will it draw? a. 1440 b. 1680 c. 13 d. 187,200
c. 13
A series circuit has two resistors that dissipate 10 W and 15 W, respectively. What is the total power dissipation of the circuit? a. 10 W b. 5 W c. 25 W d. 15 W
c. 25 W
How many amperes is present in a 20-volt battery with a 30-ohm resistor? a. 0.5 b. 1.5 c. 0.15 d. 0.67
d. 0.67
What is the maximum number of valence electrons in an atom? a. four b. eight c. twelve d. six
b. eight
What device is designed to open and disconnect a circuit in the event of excessive current? a. power supply b. wire c. fuse d. potentiometer
c. fuse
The magnetic quantity Weber (Wb) is equal to 100,000,000 lines of flux. If a conductor cuts through one Weber per second, then a voltage of _____ volt(s) is induced into the conductor. a. five b. four c. ten d. one
d. one
One rule for ________ circuits states that the voltage is the same across each branch of the circuit. a. series b. combination c. complex d. parallel
d. parallel
The no-load voltage of a cell is greater than the normal load voltage because of the internal _____ of the cell. a. capacitance b. reactance c. inductance d. resistance
d. resistance
Assume a total current of 2 amperes flows in a circuit with three resistors. R1 has a value of 1400 ohms, R2 has a value of 200 ohms, and R3 has a value of 100 ohms, producing a total resistance of 80 ohms for the circuit. What is the amount of the current flow through resistor R1? a. 0.114 b. 0.800 c. 1.600 d. 0.228
a. 0.114
An inductor has a maximum current of 4 amperes. When power is interrupted, how much current will flow at the end of the third time constant? a. 0.20 A b. 0.076 A c. 0.54 A d. 1.40 A
a. 0.20 A
In the above diagram of connected batteries, what is the total voltage? a. 24 V b. 48 V c. 3 V d. 12 V
a. 24 V
A circuit with resistive elements of 220, 100, 57, and 43 produce what total resistance? a. 420 b. 42 c. 3.5 d. 0.2857
a. 420
A coil has an inductance of 3 H and a wire resistance of 15 Ω. How long will it take for the current to reach its full value? a. 45 seconds b. 0.2 seconds c. 1.0 seconds d. 25 seconds
a. 45 seconds
What is created by causing an excess of electrons to form at that terminal? a. negative terminal b. neutral terminal c. electron d. positive terminal
a. negative terminal
A series circuit has _____ path(s) for current flow. a. one b. three c. unlimited d. two
a. one
The speaker uses what type of magnets? a. one permanent and one electromagnet b. two permanents c. it does not use magnets d. two electromagnets
a. one permanent and one electromagnet
In a one- terminal zero-center voltmeter connected to ground and the probe connected to a Point B, the pointer of the voltmeter gives a ________ indication for voltage. a. positive b. negative c. stabilizing d. neutralizing
a. positive
A variable resistor with three terminals is called a _____. a. potentiometer b. wire wound resistor c. multiturn resistor d. rheostat
a. potentiometer
What is another term for a variable resistor? a. potentiometer b. wire wound resistor c. metal film resistor d. multiturn resistor
a. potentiometer
The longer the conductor, the more _____ it will have. a. resistance b. diameter c. voltage
a. resistance
In _____________ circuits, the total resistance is equal to the reciprocal of the sum of the reciprocals of the branchresistances. a. series b. parallel c. combination
b. parallel
When a conductor is very large it may become necessary to connect the conductors in _____. a. series b. parallel
b. parallel
Rubbing a hard rubber rod on a piece of wool produces what kind of charge? a. no charge b. neutral c. negative d. positive
c. negative
Which of the following is a secondary cell? a. alkaline b. Edison-Lalande c. nickel-cadmium d. mercury
c. nickel-cadmium
Circuits that have more than one path for current flow are _____ circuits. a. series b. combination c. parallel
c. parallel
Since the invention of calculators, which formula has become the most popular? a. resistors of equal value b. product over sum c. reciprocal formula
c. reciprocal formula
In accord with Lenz's law, the induced voltage is opposite in polarity to the applied voltage. The induced voltage therefore acts like a(n) ____________ to hinder the flow of current through the inductor. a. insulator b. switch c. resistance d. inductor
c. resistance
Using Fleming's left-hand generator rule, which points to the movement of the conductor? a. center finger b. pinky finger c. thumb d. forefinger
c. thumb
In a combination circuit, to identify series and parallel elements, you should _____. a. calculate the total resistance b. calculate the total current c. trace the current path(s) d. trace the voltage path(s)
c. trace the current path(s)
he nucleus of an atom contains_____. a. electrons and protons b. neutrons and quarks c. neutrons and protons d. electrons and quarks
c. neutrons and protons
Thermocouples produce voltage because of the action of two dissimilar metals. The voltage produced depends on the type of metals used and the _____ difference between the junction and the open ends. a. temperature b. distance c. height d. time
a. temperature
A resistor whose values can be varied over a range of values is called a _____ resistor. a. variable b. carbon c. fixed d. wire wound
a. variable
The amount of _____ across a resistor is proportional to its resistance and the circuit current. a. voltage drop b. voltage rise c. current rise d. current drop
a. voltage drop
What type of resistors are generally used when a high power rating is needed? a. wire-wound b. carbon film c. metal film d. metal glaze
a. wire-wound
A node is a junction point where the current splits when reached. a. True b. False
a. True
A piece of wire that is one mil in diameter and one foot long is one mil-foot. a. True b. False
a. True
Before the resistor value can be calculated, the operating characteristics of the meter must be known. a. True b. False
a. True
Industry often uses an electromagnet to pick up metal objects, often called round horseshoe magnets a. True b. False
a. True
The ___________ can be used to clearly illustrate that if the polarity of the magnetic field is changed or if the direction of armature rotations is changed, the direction of induced current also changes. a. exponential curve b. Fleming's left-hand rule c. Lenz's law d. inductance formula
b. Fleming's left-hand rule
When a closed loop of wire cuts through magnetic flux lines, a current is induced into the loop. The current in the loop sets up a magnetic field that is in opposition to the original magnetic flux. This is essentially _____. a. Ohm's law b. Lenz's law c. Coulomb's law d. Weber's law
b. Lenz's law
The time required for current in an inductor to reach its full Ohm's law value is called the _____ time constant. a. R-C b. R-L c. R2 d. L-R
b. R-L
In the combination circuit above, what must the same current flow through? a. Point A and R1 b. R1 and R2 c. R1 and R4 d. R1 and R3
b. R1 and R2
A voltaic cell is constructed of two unlike metals and a(n) _____, alkaline, or salt solution. a. saline b. acid c. ion d. salty
b. acid
When using the left-hand generator rule, the center finger points to the direction of _____. a. flux b. current c. thrust d. power
b. current
What is one of the most common analog meter movements? a. plunger b. d'Arsonval movement c. concentric vane d. moving iron
b. d'Arsonval movement
If a magnetized object is struck, the vibration often causes the molecules to rearrange themselves in a ___________ fashion. a. positive b. disordered c. ordered d. negative
b. disordered
In the English system of measure, magnetic strength is measured in terms of _____. a. permeability b. flux density c. residual magnetism d. reluctance
b. flux density
In total resistance, each time another element is connected in parallel, there is _____________ to the flow of current through the entire circuit. a. less attraction b. less opposition c. more attraction d. more opposition
b. less opposition
The insulation used on conductors cannot operate in all possible temperatures. The highest allowable temperature is called the _____ temperature. a. minimum operating b. maximum operating c. correction d. ambient
b. maximum operating
If a voltage is being induced into a conductor by electromagnetic induction, reversing the direction of motion of the conductor will _____. a. not change anything b. reverse the polarity of the induced voltage c. halve the induced voltage d. double the induced voltage
b. reverse the polarity of the induced voltage
Which of the following is one function of a resistor in a circuit? a. to increase the flow of current b. to limit the flow of current c. to produce a wattage divider d. to produce a resistor divider
b. to limit the flow of current
What meter is designed to be connected directly across the power source? a. ammeter b. voltmeter c. galvanometers d. analog meter
b. voltmeter
When using the oscilloscope to interpret the _____________ on display, it is important to remember that the display shows the voltage with respect to time. a. voltage b. waveforms c. watts d. frequency
b. waveforms
A hand-crank MEGGER requires batteries. a. True b. False
b. False
All insulations perform equally well in dry, damp, and wet locations. a. True b. False
b. False
The resistors are connected in parallel with the meter on some ranges and in series for other ranges when a(n) _____ is used. a. current transformer b. d'Arsonval shunt c. Ayrton shunt d. moving vane transformer
c. Ayrton shunt
A combination circuit is a circuit that contains _____. a. both voltage and current sources b. only series components c. both series and parallel components d. only parallel components
c. both series and parallel components
In a series circuit, each resistor ______________ the flow of current in the circuit. a. stabilizes b. neutralizes c. impedes d. increases Hide Feedback
c. impedes
In the case of an automobile electric system, the chassis of the vehicle is the ___________ side of the circuit. a. voltmeter b. neutralizer c. negative d. positive
c. negative
When the connection of a meter to the circuit changes the entire circuit operation, this is known as the _____ effect. a. impedance b. crossing c. hatching d. loading
d. loading
What type of fixed resistor is made by combining metal with glass and then applying it to a ceramic base as a thick film? a. metal film b. carbon film c. wire-wound d. metal glaze
d. metal glaze
A three-branch parallel circuit has resistors of 27 Ω, 56 Ω, and 15 Ω. What is the total resistance? a. 8.23 Ω b. 18.22 Ω c. 9.64 Ω d. 98 Ω
a. 8.23 Ω
Any object repelled by a piece of what rubbed on silk would have a positive charge? a. glass b. hard rubber c. mica d. wool
a. glass
A joule is defined as 1 newton-meter. a. True b. False
a. True
A person can prevent a painful shock by holding a coin in one hand and touching the coin to a grounded surface. a. True b. False
a. True
An excellent example of using a chassis ground as a common connection can be found in the electric system of an automobile. a. True b. False
a. True
Because a circuit breaker is connected in a series with the rest of the circuit, all the circuit current must flow through them. a. True b. False
a. True
Because only one path exists for the current to flow through a series circuit, it must flow through each resistor in the circuit. a. True b. False
a. True
Which of the following is the formula for resistors of equal value? a. b. c. d.
b.
Nylon is an excellent ____________ material and is used in most carpets a. resisting b. insulating c. attracting d. grounding
b. insulating
The velocity of AC through a conductor is _____ the speed of light. a. greater than b. less than c. equal to
b. less than
In bump theory, what does the additional striking energy cause the electron to do? a. move into orbit and transform into a new electron b. move out of orbit and become a free electron c. move out of orbit and become a valence electron d. move into orbit and attach to a new electron
b. move out of orbit and become a free electron
As droplets of paint pass through the grid during, spray painting, what charge causeselectrons to be removed from the paint droplets? a. no charge b. positive charge c. grounding charge d. negative charge
b. positive charge
When using a dry copy machine, a high-voltage wire located near the drum causes the selenium to have what charge as it rotates? a. no charge b. positive charge c. grounding charge d. negative charge
b. positive charge
Which method of producing electricity involves the striking, bending, or twisting of certain crystals? a. air b. pressure c. light d. magnetism
b. pressure
During normal operation of a typical 120-volt appliance circuit, current flows through the hot, grounding, and neutral conductors. a. True b. False
b. False
Imagine a water system with a holding tank, pump, and return lines. What would happen to the resistance to flow if a return path is added to the system? a. It increases. b. It stays the same. c. It lessens.
c. It lessens.
The current, voltage, power, and resistance in a series circuit can be calculated using _____ law. a. Volt's b. Ampere's c. Ohm's d. Coulomb's
c. Ohm's
What did William Gilbert call material that could be charged? a. noneclectriks b. attraction c. eclectriks d. repulsion
c. eclectriks
Within a lightning bolt, current flows _____. a. in both directions b. from positive to negative c. from negative to positive
c. from negative to positive
The charge that accumulates on an object is determined by the ____________ used to produce the charge. a. current b. electrons c. materials d. charge
c. materials
