Basic Electrical Theory Final Exam
questions n 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 nonsinusoidal 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
questions n 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 nonsinusoidal 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
