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IEC second year second semester first quarterly exam Questions and Answers 100% Correct
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IEC second year second semester firstquarterly exam
If the RMS value is 125 volts, what is the peak value?
a.128.53
b.201.32
c.176.75
d.180.53 - answer176.75
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.a magnetic field
b.static electricity
c.DC voltage
d.pure resistance - answera magnetic field
A coil of wire wrapped around an iron core is a(n) ___ when it carries current.
a.motor
b.electromagnet
c.capacitor
d.resistor - answerelectromagnet
A coil of wire, when carrying current, acts like a ___.
a.resistor
b.magnet
c.motor
d.capacitor - answermagnet
One AC voltage cycle is completed in ___ degrees. - answer360
Each phase of three-phase AC power is offset by ___ degrees. - answer120
Which of the conversion formulas listed below is correct?
RMS = Peak ÷ 0.707
b.RMS = Peak x 1.414
, c.RMS = Peak x 0.707
d.RMS = Peak x 2 - answerRMS = Peak x 0.707
RMS is an abbreviation for ___. - answerRoot Mean Square
___ when current flows in a conductor.
.Heat is generated
b.A magnetic field is created
c.both a and b
d.neither a nor b - answerboth a and b
The magnetic field strength around a conductor is at its maximum when the AC current
is at ___ degrees. - answer90
Which of the formulas, shown below, is correct to find the total of three capacitors in a
series circuit? - answerCT=c1+c2+c3
Which of the formulas, shown below, is correct to find the equivalent of 3 inductors in a
series circuit? - answerLt=L1+l2+l3+l4
In a purely capacitive circuit, current is said to ___ the applied source voltage. -
answerlead
In an inductive circuit, the current ___ the applied voltage. - answerlags
In an AC circuit containing resistance plus inductance, or resistance plus capacitance,
or resistance plus inductance and capacitance, the opposition to current flow is called
___. - answerimpedance
The presence of capacitive reactance in a circuit affects current flow. What is the
designated symbol for capacitive reactance? - answerXC
Which of the following is (are) measured in ohms?
a.capacitive reactance (XC)
b.inductive reactance (XL)
c.resistance (R)
d.impedance (Z)
e.all of these - answerall of these
In a 100 Hz circuit, containing a 15 mh inductor, the inductive reactance is ___ ohms.
(Remember to change millihenrys to henrys.) - answer9.42477
In a 60 Hz circuit, containing a 12 µf capacitor, the capacitive reactance is ___ ohms.
(Remember to change microfarads to farads.) - answer221.04
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