Basic Electrical Theory Final Exam Questions and Answers.
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Course
Basic Electrical Theory
Institution
Basic Electrical Theory
Basic Electrical Theory Final Exam Questions and Answers.Basic Electrical Theory Final Exam Questions and Answers.Basic Electrical Theory Final Exam Questions and Answers.
Basic Electrical Theory Final Exam Questions
and Answers.
Electricity:
An electrical arc blast can vaporize metal parts and produces an explosive and deadly
pressure wave. How many degrees Fahrenheit can an electrical arc blast reach? -
Correct answer 30,000 degrees Fahrenheit
Electric Motors:
Does the electric motor work on the principle of the attracting and repelling forces of
magnetic fields? - Correct answer Yes
Electromagnetic Relay:
Is a holding relay primarily used for worker convenience? - Correct answer No
Current Flow on the Neutral Conductor:
A balanced 3-wire, 120/240, single-phase circuit is connected so that the ungrounded
conductors are from different transformer phases (line 1 and Line 2.) The current on the
neutral conductor will be how much percent of the ungrounded conductor current? -
Correct answer 0%
Interrupting Rating:
If the protection device is not rated to interrupt the current at the available fault values at
its listed voltage rating, it can explode while attempting to clear the fault correct? -
Correct answer Yes
Sine Wave:
A no sinusoidal waveform is created when NONLINEAR loads distort the voltage and
current sine wave. True or false? - Correct answer True
Phase Relationship:
The opposition offered to the flow of ac current by a capacitor is called "capacitive
reactance," which is expressed in ohms and abbreviated how? - Correct answer X of c
Induced Voltage and Applied Current:
The induced voltage in a conductor carrying alternating current opposes the change in
current flowing through the conductor. The induced voltage that opposes the current
, flow is interchangeably called what three things? - Correct answer CEMF, Counter-
Electromotive force, and Back-EMF
Impedance:
What is the total opposition to current flow in ac circuits and is measured in ohms? -
Correct answer impedance
Impedance:
Z is the abbreviation for what? - Correct answer Impedance
Current Flow:
Self-induced voltage opposes the change in current flowing in the conductor, is called
"inductive reactance" and is abbreviated how? - Correct answer X of l
Dual-Voltage AC Motors:
Dual-voltage ac motors are made with two field windings. How are the field winding
connected for low-Voltage operation? - Correct answer Parallel.
Dual-Voltage AC Motors:
Dual-voltage ac motors are made with two field windings. How are the field windings
connected for high-voltage operation? - Correct answer Series
Motor Current Ratings:
The motor FLA rating is used when sizing motor conductor size or circuit protection?
True or False? - Correct answer False
Motor Starting Current:
When a motor starts, the current drawn is approximately 6 times the motor FLA; this is
known as what? - Correct answer "motor locked-rotor amperes" or (LRA).
Reversing the Rotation of an AC Motor:
Swapping two of the line conductors can reverse a kind of ac motor's rotation? - Correct
answer 3-phase
Transformer Basics:
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