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iec year 2 part 3
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IEC YEAR 2 PART 3 COMPLETESOLUTION 100% VERIFIED ANSWERS
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x___ 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." -
Coulomb's
Which of the formulas, shown below, is correct to find the equivalent of three inductors in a parallel
circuit? - LT= 1 / ( 1/L1 + 1/L2 + 1/L3)
If the RMS value is 125 volts, what is the peak value? - 176.75
Which of the symbols, shown below, is used to represent an inductor in a schematic circuit? - 219 RW Q4
C
Electrical current is the flow of ___. - electrons
What type of magnet is used for the coil in a relay? - electromagnet
___ flow equals current flow. - Electron
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. - a magnetic field
A ___ is a device that converts electrical energy into a linear force. - solenoid
Two unlike poles of magnets brought together cause the magnets to ___ each other. - attract
,Permanent magnets are used in the construction of ___ motors.I. AC II. DC - II only
Nonferrous materials, such as copper, ___ attracted by the magnetic field around a magnet. - are not
A coil of wire wrapped around an iron core is a(n) ___ when it carries current. - electromagnet
Motors, circuit breakers, contactors, relays, and motor starters all use ___ principles. - electromagnetic
The strength of the magnetic field around a coil (or winding) ___ when AC voltage is applied. - varies
The basic law of magnetism states that unlike poles (south and north, for example) ___ each other. -
attract
As two magnetic poles of the same polarity get closer together the force of ___ gets stronger. - repulsion
A coil of wire, when carrying current, acts like a ___. - magnet
The invisible magnetic lines that leave the north pole and enter the south pole of a magnet are ___. -
lines of flux
A ___ is a device that attracts iron and steel because of the molecular alignment of its material. - magnet
Current flow through a conductor creates a magnetic field around the conductor. - True
As current flow through a conductor increases, the magnetic field strength ___. - increases
The strength of the magnetic field around a coil (or winding) ___ when DC voltage is applied. - is
constant
If the current flowing through a coil of wire is increased, the magnetic field strength ___. - also increases
,If a circuit is operating at 277 volts (RMS) the peak value of the voltage is ___ volts. - 391.8
Which of the symbols, shown below, is used to represent an AC power source in a schematic circuit? -
219.2 Q2 D
The term gigahertz means ___ per second. - billion cycles
To an electrician the drawing at the right represents ___. - a sine wave
One AC voltage cycle is completed in ___ degrees. - 360
Each phase of three-phase AC power is offset by ___ degrees. - 120
The horizontal axis on a voltage sine wave, generated from an AC generator, represents ___. - time
Which of the conversion formulas listed below is correct? - RMS = Peak x 0.707
RMS is an abbreviation for ___. - Root Mean Square
A charged body is surrounded by ___. - a magnetic field
___ is the output of an AC generator measured in cycles per second. - Frequency
When two like-charged bodies are brought together, their magnetic fields will work to ___ them. - repel
___ when current flows in a conductor. - both a and b
The vertical axis on a voltage sine wave, generated from an AC generator, represents ___. - voltage
, Where operating in the United States, AC voltage reaches a positive peak ___ times during 1 second. - 60
___ 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. - AC
An AC generator produces ___ cycle(s) per revolution for each pair of poles. - one
The peak-to-peak value of a sine wave is ___ the maximum positive peak value. - twice
A capacitor is made up of a pair of conductive plates separated by a thin layer of ___ material. -
insulating
The magnetic field strength around a conductor is at its maximum when the AC current is at ___
degrees. - 90
___ is the property of an electrical circuit that opposes any change in current. - Inductance
Inductors in series add like resistors in ___. - series
Which of the formulas, shown below, is correct to find the equivalent of 3 caps in a parallel circuit? -
CT=C1+C2+C3
Inductance is measured in ___. - Henrys
A change in the magnetic field surrounding the conductor induces a voltage in the conductor. This
induced voltage is known as ___. - Counter EMF
___ is the measure of a circuit's ability to store an electrical charge. - Capacitance
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