IEC Year 2 Semester 2 Questions And Answers Graded A+.
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Course
IEC
Institution
IEC
________________________________________
IEC Year 2 Semester 2 Questions And Answers Graded A+.
In a 60 Hertz system, the voltage will go to "0" ___ times per second? - correct answer. D.
120
What type of magnet is used for the coil in a relay? - correct answer. C.
electromag...
IEC Year 2 Semester 2 Questions And
Answers Graded A+.
In a 60 Hertz system, the voltage will go to "0" ___ times per second? - correct answer.
D.
120
What type of magnet is used for the coil in a relay? - correct answer. C.
electromagnet
___ flow equals current flow. - correct answer. C.
Electron
______ law states "charged bodies attract or repel each other with a force that is
directly proportional to the product of the charges and inversely proportional to the
square of the distance between them." - correct answer. D.
Coulomb's
If the RMS value is 125 volts, what is the peak value? - correct answer. D.
176.75
If the RMS value is 125 volts, what is the peak value? - correct answer. D.
176.75
Which of the symbols, shown below, is used to represent an inductor in a schematic
circuit? - correct answer. C.
Electrical current is the flow of ___. - correct answer. B.
electrons
Which of the formulas, shown below, is correct to find the total of three capacitors in a
series circuit? - correct answer. B.
,Which of the formulas, shown below, is correct to find the equivalent of three inductors
in a parallel circuit? - correct answer. A.
As current flow through a conductor increases, the magnetic field strength ___. - correct
answer. C.
increases
Current flow through a conductor creates a magnetic field around the conductor. -
correct answer. B.
True
A change in the magnetic field surrounding the conductor induces a voltage in the
conductor. This induced voltage is known as ___. - correct answer. B.
Counter EMF
A ___ is a device that converts electrical energy into a linear force. - correct answer.
D.
solenoid
A ___ is a device that attracts iron and steel because of the molecular alignment of its
material. - correct answer. D.
magnet
Nonferrous materials, such as copper, ___ attracted by the magnetic field around a
magnet. - correct answer. B.
are not
Permanent magnets are used in the construction of ___ motors.I. AC II. DC - correct
answer. D.
II only
The invisible magnetic lines that leave the north pole and enter the south pole of a
magnet are ___. - correct answer. A.
lines of flux
Two unlike poles of magnets brought together cause the magnets to ___ each other. -
correct answer. C.
attract
The basic law of magnetism states that unlike poles (south and north, for example) ___
each other. - correct answer. A.
attract
As two magnetic poles of the same polarity get closer together the force of ___ gets
stronger. - correct answer. B.
,repulsion
If the current flowing through a coil of wire is increased, the magnetic field strength ___.
- correct answer. C.
also increases
A coil of wire, when carrying current, acts like a ___. - correct answer. B.
magnet
A coil of wire wrapped around an iron core is a(n) ___ when it carries current. - correct
answer. D.
electromagnet
The strength of the magnetic field around a coil (or winding) ___ when AC voltage is
applied. - correct answer. B.
varies
The strength of the magnetic field around a coil (or winding) ___ when DC voltage is
applied. - correct answer. A.
is constant
Motors, circuit breakers, contactors, relays, and motor starters all use ___ principles. -
correct answer. C.
electromagnetic
When AC current passes through a circuit conductor or a connected load, it creates ___
that creates (or induces) a voltage in the circuit that actually opposes the applied
voltage. - correct answer. D.
a magnetic field
When current passes through a conductor, a magnetic field is created around the
conductor. When individual circuit conductors are either in close proximity (in wireways,
trenches, cable trays, etc) or contained in the same cable or conduit, these magnetic
fields cancel each other because the currents in each conductor are not in phase with
each other. - correct answer. A.
True
The term gigahertz means ___ per second. - correct answer. C.
billion cycles
___ when current flows in a conductor. - correct answer. C.
both a and b
A charged body is surrounded by ___. - correct answer. A.
a magnetic field
, ___ loss is loss caused by the induced currents that are produced in metal parts that
are being magnetized. - correct answer. D.
Eddy current
To an electrician the drawing at the right represents ___. - correct answer. C.
a sine wave
Where operating in the United States, AC voltage reaches a positive peak ___ times
during 1 second. - correct answer. E.
60
One AC voltage cycle is completed in ___ degrees. - correct answer. D.
360
___ 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. - correct
answer. A.
AC
The vertical axis on a voltage sine wave, generated from an AC generator, represents
___. - correct answer. D.
voltage
The horizontal axis on a voltage sine wave, generated from an AC generator,
represents ___. - correct answer. C.
time
Each phase of three-phase AC power is offset by ___ degrees. - correct answer. D.
120
___ is the output of an AC generator measured in cycles per second. - correct answer.
B.
Frequency
An AC generator produces ___ cycle(s) per revolution for each pair of poles. - correct
answer. D.
one
The peak-to-peak value of a sine wave is ___ the maximum positive peak value. -
correct answer. A.
twice
RMS is an abbreviation for ___. - correct answer. C.
Root Mean Square
Which of the conversion formulas listed below is correct? - correct answer. C.
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