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