Final Exam Prep Flashcards
True power is dissipated as heat.
True
The maximum benefit is realized when the capacitors are placed at the load (or point of consumption).
True
A single-phase power source can be generated by rotating a magnetic field through a single stationary coil.
True
Can an owner be allowed to occupy a portion of the new structure before it is complete.
Yes / True
The first part of a sling inspection is to find the tag.
True
A sling must be immediately removed fro service if the warning yarns are visible.
True
Knots should be untied only if they have not yet been pulled tight under load.
True
Assuming a purely inductive circuit, current will ? the voltage by ?.
a. lag / 60 deg.
b. lag / 90 deg.
c. lead / 60 deg.
d. lead / 90 deg.
B. lag / 90 Deg.
The sine waves in the figure shown indicate the phase relationship between current and voltage in a ? AC circuit.
(the diagram shows Voltage leading Current by 90 degrees or current lagging voltage by 90 degrees.)
a. purely capacitive
b. purely inductive
c. purely resistive
b. purely inductive
In a purely capacitive circuit, current will ? the voltage by ?.
lead / 90 degrees
As the phase angle is decreased, the power factor is ? .
a. decreased
b. increased
b. increased
Every group should adopt an order of business and set rules of order for their meetings to ? .
a. assist the attendees
b. complete business
c. conduct orderly meetings
d. move the agenda
c. conduct orderly meetings
In an effort to kill a main motion, a motion to ? the main motion should be made.
a. close
b. postpone indefinitely
c. recall
d. rescind
b. postpone indefinitely
There is a motion, an amendment to the motion, and an amendment to the amendment How many times must a vote be taken to clear up al of these motions?
a. 1 c. 5
b. 3 d. 7
b. 3
Listed below are five possible motions. Four are instances when it is NOT necessary to get recognition from the chair to speak. Which instance requires recognition from the chair to speak?
a. A question of privilege
b. Call for division of the house
c. To appeal a decision
d. To second a motion
e. To table a motion
e. To table a motion
what percentage of votes is required to pass main motions?
a. 50% c. Anything over 50%
b. 66 2/3% d. Less than 50%
c. Anything over 50%
A generator is a device that converts ? energy into ? energy.
Mechanical / Electrical
? voltage is induced into the conductor when the loop is at o deg., 180 deg., and 360 deg. in relation to the field.
Zero
A ? causes the AC voltage that is generated to appear as a DC voltage output, because it is a ring constructed of segments separated by insulating material. The connection of the generator loop to these segments is such that the output is always of the same polarity.
Commutator
? is/are a type of armature winding found in generators.
a. Frogleg
b. Lap wound
c. Wave wound
d. All of the above.
d. all of the above
Once the pole pieces are mounted in the generator, the field windings are ? the pole pieces to form an electromagnet.
Wound around
What are the two types of connections for generator field windings?
a. Frogleg and lap
b. Series and shunt
c. Wave and lap
d. Wye and delta
b. series and shunt
Power factor is defined as the ? of theta, and it can be calculated by dividing the ? in the power triangle by the ?.
Cosine / kilowatts / kilovolt-amperes
Power factor is normally corrected by adding a(n) ? in parallel with the load.
capacitor
Which of the factors listed contributes to the economic feasibility of making power factor corrections?
a. lower bill
b. smaller conductors
c. smaller controllers
d. smaller fuses
e. All of the above
e. all of the above
calculation…
If a 208-volt, 3-phase circuit that has line current of 15 amperes has a power factor of 80%, how much true power is dissipated by the circuit?
a. 4182 W
b. 4318 W
c. 4387 W
d. 4418 W
b. 4318 W
W=VA X PF
208 x 15 x 1.73
= 5398 X .8
= 4318 w
? , as it applies to electrical distribution systems, means that power is transmitted using multiple wires utilizing voltages that are equal in magnitude but are separated in phase angle (or time).
a. cycle
b. phase
c. polyphase
d. single-phase
c. polyphase
Most electrical power generated today is ?.
a. single phase
b. 2 phase
c. 3 phase
d. 4 phase
c. 3 phase
a 3-phase power source can be produced by rotating a magnetic field through three separate coils arranged ? apart.
a. 30 deg
b. 90 deg
c. 120 deg
d. 210 deg
c. 120 deg
The horsepower rating of 3-phase motors and the kilovolt-ampere rating of 3-phase transformers are about ? of single-phase motors and transformers of about the same physical size.
a. 133%
b. 150%
c. 200%
d. 300%
b. 150%
? is the number of cycles per second of an AC sine wave.
a. Alternation
B. Frequency
c. Period
d. Signal
b. Frequency
On an oscilloscope, the horizontal (x) axis represents ? , and the vertical (y) axis represents ? of the voltage waveform.
a. amplitude / time
b. time / amplitude
b. time / amplitude
To determine the frequency of the waveform divide the ? into 1.
a. amplitude
b. frequency
c. Hertz
d. time period
d. time period
What is the problem associated with increasing carrier frequency of a variable frequency drive?
a. It can increase the noise produced by the motor.
b. Nothing, the motor will just speed up.
c. The motor will not start.
d. The motor will overheat.
a. It can increase the noise produced by the motor.
? is the process of taking a small signal and increasing the size of the signal.
a. Amplification
b. Compression
c. Gain
d. Rectification
a. amplification
A(n) ? is an acoustical unit used to measure the intensity (volume) of sound.
a. amplitude
b. decibel
c. hertz
d. sound pressure level (SPL)
b. decibel
Generators are electromechanical devices that turn ? energy into ? energy.
a. electrical / mechanical
b. kinetic / potential
c. mechanical / electrical
d. potential / heat
c. mechanical / electrical
The source for mechanical motion supplied to a generator is referred to as the ?.
a. driver
b. engine
c. originator
d. prime mover
d. prime mover
In order to induce electrical energy into a conductor or generator, what three factors must be present?
I. conductor
II. Heat
III. Magnetic Field
IV. Relative motion
V. Rotation
a. I, II, and III
b. I, III, and IV
c. I, III, and V
d. II, III, and V
b. I, III, IV
conductor, Magnetic field, and relative motion
The winding in a generator where voltage is induced is called the ?.
a. armature
b. commutator
c. exciter
d. slip ring
a. armature
The measure of how frequently a generator produces a sine wave is called the ? of the waveform.
a. cycles
b. frequency
c. hertz
d. period
b. frequency
AC generators can be constructed in two basic styles and can be described as a ? type or a ? type generator.
a. brush / brushless
b. commutating / non-commutating
c. revolving armature / revolving field
d. slip ring / commutator
c. revolving armature / revolving field
Increasing the turns or loops of wire on the rotating armature of a generator would cause a(n) ? output of the generator.
a. decrease of current
b. decrease of voltage
c. increase of current
d. increase of voltage
d. increase of voltage
The primary difference between a simple DC generator and a simple C generator is the method by which the voltage is removed from the armature; in a DC generator, the voltage is removed by using brushes on ? . In an AC generator, the voltage is removed by using ? .
a. a commutator / sliprings
b. sliprings / a commutator
a. a commutator / sliprings
? are constructed as a continuous ring, with each end of the armature loop connected to a separate ring.
a. Brushes
b. Comutators
C. Slip rings
c. slip rings
When the armature is held stationary in a generator, it is called the ? .
a. armature
b. commutator
c. rotor
d. stator
d. stator
Pole faces that just out and are very pronounced are called ? poles.
a. extended
b. protruding
c. round
d. salient
d. salient
Alternators with small kilovolt-ampere ratings are usually ? cooled.
a. air
b. hydrogen
c. nitrogen
d. oxygen
a. air
Select the factors that determine the output voltage of an alternator.
I. The length of the armature conductors
II. The speed of rotation of the conductor in the magnetic field
III. The strength of the magnetic field
IV. The size of the conductor
a. I, II, III
b. I, II, III, IV
c. II, III, IV
d. I, III, IV
a. I, II, III
A ? test instrument is a device that is installed in a process or at a bench to continually measure and display quantities.
a. digital multimeter
b. momentary
c. permanent
d. portable
c. permanent
AC voltage is voltage in a circuit that reverses its direction of flow at regular intervals and is stated an measured as a peak, average, or ? value.
a. I2R
b. null
c. RMS
d. zero-crossing
c. RMS
The average value of an AC sine wave is the mathematical mean of all instantaneous voltage values in half the sine wave and is equal to ? of the peak value.
a. 0.5
b. 0.637
c. 0.797
d. 0.92
b. 0.637
An ohmmeter is a test instrument that measures ? , the opposition to the flow of electrons in a circuit.
a. current
b. resistance,
c. voltage
d. all of the above
b. resistance
Voltage measurements using the ? on a digital multimeter are useful in identifying low-voltage conditions caused by large motors starting up, by temporary voltage losses, or by a circuit overloading or high voltage surges.
a. analog scale
b. bar graph
c. MIN MAX mode
d. diode test mode
c. MIN MAX mode
The relative mode on a digital multimeter can be used to zero out any ? that is constantly drawn by an electrical system during normal operation. As an individual load is turned on current measurements are displayed for that load only.
a. stray capacitance
b. current
c. resistance
d. stray voltage
b. current
What are the two basic types of dimensions found on construction prints?
a. full and scaled
b. size and location
c. approximate and accurate
d. original and revised
b. size and location
The face view of a building or residence can be seen on a(n) ? plan.
a. elevation
b. floor
c. site or plot
d. sectional
a. elevation
A ? view is often referred to as a “cut” or a “cut-away” view.
a. detail
b. elevation
c. floor plan
d. section
d. section
An electrician needs to view a residential wall section print showing the foundation detail. Choose a possible reason an electrician would have for reading this wall section detail.
a. To determine the depth of foundation
b. To determine the thickness of the finish material
c. To define the various materials used
d. To determine the thickness of the wall
e. Any reason above
b. To determine the thickness of the finish material
Select the three main reasons for the use of symbology on prints.
I. Able to be used across different languages
II. saves space on drawings
III Simplifies production
IV Simplifies notation
V Standardizes notation
c. II, IV, V
In trying to read a new or unknown symbol, the Electrical Worker may look in a book of standards or in the drawing ? .
a. legend
b. elevation sheet
c. specifications
d. title block
a. legend
All symbols do not necessarily conform to a standard. If one encounters a symbol that is not on the standard list, one might find it in the legend or in the ? .
a. elevation sheet
b. specifications
c. symbol library
d. title block
c. symbol library
On the NJATC residential print (Franlkin residence), choose three most commonly used electrical symbols from the following list.
I. ceiling fan
II. Lights
III. Motors
IV. Receptacles
V. Switches
d. II, IV, V
How are the rungs of a ladder diagram numbered?
a. From left to right, bottom to top
b. From left to right, top to bottom
c. From right to left, bottom to top
d. From right to left, top to bottom
b. from left to right, top to bottom
Where should one look for information on the symbols for a totally new technology?
a. Drawing legends
b. Electrical manuals
c. Manufacturer’s information
d. Industry standards
e. All of the above
E. all of the above
? lines are thick lines that define solid objects or boundaries.
a. Dimension
b. Object
c. Plan
d. Section
b. Object
In blueprints, a ? line is used to visually cut out a section for further inspection.
a. cutting plane
b. hidden
c. object
d. section
a. cutting plane
Extension lines are straight and mark the ? of an object.
a. beginning and the end
b. centerline
c. left and right sides
d. top and bottom
a. beginning and the end
? lines show the size of an object.
a. center
b. dimension
c. leader
d. section
b. dimension
A ? has the benefits of being able to provide a horizontal and vertical straightedge and be rotated and locked at any tangle.
a. compter-aided design station
b. drafting machine
c. rolling straight edge
d. none of these
b. drafting machine
The electronic system now used to produce virtually all residential, commercial, and industrial drawings is called a ? system.
a. ACAD
b. CAD
c. CAE
d. CAM
b. CAD
Which of the following are advantages of electronic drawing systems?
I. ability to easily change or revise drawings
II. layers
III. precise drawings
IV. Send files electronically
e. all are advantages
Project or job specifications are defined as ? under which all work must be performed.
a. general duties
b. lists of detailed job requirements
c. specific requirements
d. the text portions of the construction documents
b. lists of detailed job requirements
With which sections of the specifications should the electrical contractor be concerned?
a. Divisions o, 1, 15, and 16
b. Divisions 0, 1, 2, 15, and 16
c. Divisions 0, 1, 2, 10, 15, and 16
d. All divisions (Division 0 through 16)
d. All divisions
In the commercial specifications, where are the electrical specifications found?
Division 16
If a set of prints incorporates non-standard or job specific symbols, it should also contain a ? .
a. reference note
b. legend or symbol library
c. explanation
d. disclaimer
b. legend or symbol library
Where should one look for information on the symbols for a totally new technology?
a. Manufacturer’s information
b. Electrical manuals
c. Drawing legends
d. Industry standards
e. All of the above
e. all of the above
Telecommunication distribution systems are being used more widely to control a variety of ?, inputs, and outputs.
a. voltages
b. resistances
c. power
d. currents
a. voltages
Representation of devices might be accomplished pictorially and with symbology, ? looks like the object, and ? just represents the object.
a. pictorial / symbolic
b. symbolic / pictorial
a. pictorial symbolic
Which scale is based on tenths and hundredths of an inch?
a. Architect’s
b. Civil engineer’s
c. Decimal
d. Mechanical engineer’s
c. decimal
Which scale is based on relations like 1/4” = 1” or 1/2” = 1”?
Mechanical Engineer’s
Which scale is based on relations like 1/4” = 1’ or 1/8” = 1’
Architect’s
Describe the process of checking a drawing to determine if it can be scaled.
a. All true scale are dividable by 1/8” without a remainder.
b. All true scales are dividable by 1/16” without a remainder.
c. Verify by checking any line that also includes a marked dimension.
d. Use a scale to check both vertical and horizontal dimensions with those given on the drawing.
d. Use a scale to check both vertical and horizontal dimensions with those given on the drawing.
As a general rule, the overall scale of a full sheet drawing is most likely located ? .
a. at the bottom left
b. at the right margin center
c. in the title block
d. near the top left side
c. in the title block
On the 1/4” = 1’ architect’s scale, what makes it possible to scale or measure a distance of 1’4”?
a. Use the 1/8” scale and convert.
b. Use the 1/16” scale and convert.
c. The large divisions at the end of the scale.
d. The small divisions at the end of each scale.
d. the small divisions at the end of each scale.
If the actual length of a line on a construction drawing is 2 7/8”, what length of a distance does this line represent if the drawing scale is 1/4” = 1’?
a. 8’0”
b. 9’6”
c. 10’0”
d. 11’6”
d. 11’6”
If the actual length of a line on a construction drawing is 24 5/16”, what length of a distance does this line represent if the drawing scale is 1/8” = 1”?
a. 149’6”
b. 192’6”
c. 193’6”
d. 194’6”
d. 194’6”
When scaling a print you must remember that ? always supersede scaled dimensions.
a. revisions
b. architect’s scales
c. title blocks
d. written dimensions
d. written dimensions
- When not clarified by the prints, specifications or codes, device mounting heights are determined by ?.
a. the decorator
b. the building department
c. standard practice
d. other trades on the project
c. standard practice
What are the two basic types of dimensions found on construction prints?
a. full and scaled
b. size and location
c. approximate and accurate
d. original and revised
b. size and location
If the actual length of a line on a construction drawing is 2-7/8”, what length of a distance does this line represent if the drawing scale is 1/4”=1’?
a. 8’0”
b. 9’6”
c. 10’0”
d. 11’6”
d. 11’6”
Which of the following is the maximum number of 12 AWG THHN conductors permitted in trade size 1 EMT?
a. 9
b. 23
c. 25
d. 26
d. 26
Part ? of Articles 384,376, and 360 addresses construction specifications.
a. I
b. II
c. III
d. IV
c. III
Which of the following conduit or raceway, factory elbows, and associated fittings is/are required to e listed?
a. IMC
b. RMC
c. EMT
d. PVC
e. All of the above
e. all of the above
Which section in the NEC povides the general requirement that conduits and raceways are required to be protected from being subjected to physical damage?
a. 90.4
b. 110.6
c. 300.4
d. 340
c. 300.4
Which two conduit or raceway types are exempt from the provision that generally requires raceways installed under metal-corrugated sheet roof decking to be at lease 1.5” from the lowest surface of the roof decking to the raceway?
a. EMT and RMC
b. ENT and RMC
c. IMC and RMC
d. MC and RMC
c. IMC and RMC
The requirement that all cut ends of PVC conduit be trimmed to remove rough edges is contained within which part of Article 352?
a. Part I
b. Part II
c. Part III
d. None of the above
b. Part II
Trade size 1 PVC conduit must generally be securely fastened within ? of each junction box.
a. 6”
b. 1’
c. 2’
d. 3’
d. 3’
There cannot be more than ? of bends between pull points in a run of LFMC.
a. 90 deg
b. 189 deg
c. 270 deg
d. 360 deg
d. 360 deg
Which part of Article 358 addresses reaming and threading?
a. part I
b. part II
c. part III
d. none of the above
b. part II
The combined cross-sectional area of all conductors or cables installed in an underfloor raceway cannot exceed ? of the interior cross-sectional area of the raceway.
a. 25%
b. 33%
c. 40%
d. 80%
c. 40%
Part III of the cable assembly articles addresses which of the following?
a. construction specs
b. general
c. installation
d. over 600 volts
a. construction specs
The bending radius of type AC, IGS, MI, and TC cable is addressed in which part of their respective articles?
a. part I
b. part II
c. part III
d. part IV
b. Part II
Type AC cable is permitted to be installed in ?
a. damp locations
b. dry locations
c. wet locations
d. all of the above
b. dry locations
