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second semester IEC Questions and Answers 100% Solved
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Exam of 8 pages for the course IEC at IEC (second semester IEC)
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second semester IECThe term gigahertz means ___ per second. - answer billion cycles
when current flows in a conductor. - answer both a and b
A charged body is surrounded by - answera magnetic field
To an electrician the drawing at the right represents - answera sine wave
Where operating in the United States, AC voltage reaches a positive peak ___ times
during 1 second - answer60
current constantly changes direction of flow and magnitude as it completes the circuit
from a power source to a load and then back to the power source. - answerAC
The horizontal axis on a voltage sine wave, generated from an AC generator,
represents - answertime
Each phase of three-phase AC power is offset by ___ degrees. - answer120
An AC generator produces ___ cycle(s) per revolution for each pair of poles. -
answerone
The peak-to-peak value of a sine wave is ___ the maximum positive peak value. -
answertwice
RMS is an abbreviation for - answerRoot Mean Square
Which of the conversion formulas listed below is correct? - answerRMS = Peak × 0.707
Which of the symbols, shown below, is used to represent an AC power source in a
schematic circuit? - answercircle with a line in the middle
When two like-charged bodies are brought together, their magnetic fields will work to
___ them. - answerrepel
loss is loss caused by the resistance of the copper wire to the flow of current. -
answerCopper
A change in the magnetic field surrounding the conductor induces a voltage in the
conductor. This induced voltage is known as - answerCounter EMF
, is the property of an electrical circuit that opposes any change in current. -
answerInductance
Inductance is represented by the letter - answerL
Inductance is measured in - answerHenrys
Inductors in parallel add like resistors in - answerparallel
Which of the formulas, shown below, is correct to find the equivalent of 3 inductors in a
series circuit? - answerLt = L1 + L2 + L3
is the measure of a circuit's ability to store an electrical charge. - answerCapacitance
A capacitor is made up of a pair of conductive plates separated by a thin layer of ___
material. - answerinsulating
The unit of measure for capacitance is - answerFarads
Which of the symbols, shown below, is used to represent a capacitor in a schematic
circuit? - answer-{ }-
Capacitors in series add like resistors in - answerparallel
Inductors in series add like resistors in - answerseries
Capacitors in parallel add like resistors in - answerseries
As current flow through a conductor increases, the magnetic field strength -
answerincreases
Current flow through a conductor creates a magnetic field around the conductor. -
answerTrue
A change in the magnetic field surrounding the conductor induces a voltage in the
conductor. This induced voltage is known as ___. - answerCounter EMF
A ___ is a device that converts electrical energy into a linear force. - answersolenoid
A ___ is a device that attracts iron and steel because of the molecular alignment of its
material. - answermagnet
Permanent magnets are used in the construction of ___ motors. - answerDC
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