Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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The concept of a magnetic field being formed around a conductor when current
flows through it is called ______________.
a. | capacitance | d. | All of the above | b. | electromagnetism | e. | None of the above | c. | flux |
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2.
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Which of the following is not an example of an electromagnetic device?
a. | Solenoid | c. | Resister | b. | Relay | d. | Motor |
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3.
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Inductance is measured in _______________.
a. | ohms | c. | henrys | b. | farads | d. | rpms |
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4.
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A coil that opposes any change in current flow is called a(n)
________________.
a. | inductor | c. | transducer | b. | capacitor | d. | oscillator |
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5.
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The resistance provided by an inductor in an AC circuit is called
____________.
a. | induced resistance | d. | All of the above | b. | inductive resistance | e. | None of the above | c. | electromotive
force |
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6.
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Which of the following is the correct formula for calculating total series
inductance?
a. |  | d. | All of the
above | b. |  | e. | None of the above | c. |  |
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7.
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A common inductor found in fluorescent light fixtures is a ___________.
a. | starter | c. | ballast | b. | cathode | d. | switcher |
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8.
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Which of the following is the correct formula for calculating total parallel
inductive reactance in a parallel circuit?
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9.
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The energy stored by a capacitor is call a(n) ______________.
a. | induced voltage | d. | All of the above | b. | electrostatic charge | e. | None of the above | c. | voltage
spike |
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10.
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Which of the following is a type of capacitor?
a. | Electrolytic | d. | All of the above | b. | Nonpolarized | e. | None of the above | c. | Variable |
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11.
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Capacitance is measured in ______________.
a. | farads | c. | ohms | b. | henrys | d. | volts |
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12.
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One of the effects a capacitor has in a DC circuit is that it will
_______________.
a. | charge to a voltage equal to the source voltage | d. | All of the
above | b. | continue to charge until the source is completely drained | e. | None of the above | c. | act like an open
until it is fully charged |
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13.
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The apparent resistance to AC by a capacitor is called _____________.
a. | frequency displacement | c. | passive capacitance | b. | capacitive reactance | d. | filtering |
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14.
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Which of the following is the total series capacitive reactance formula?
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15.
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A time-delay relay that uses an RC timing circuit is called a(n)
______________.
a. | solid-state, time-delay relay | c. | dashpot time-delay
relay | b. | adjustable relay | d. | motor-driven, time-delay relay |
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16.
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In an electric DC power supply, a capacitor is commonly used to
_____________.
a. | block the current flow | c. | filter out the unwanted AC voltage | b. | increase the current
flow | d. | decrease the
voltage |
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17.
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The formula for calculating total parallel capacitance is ____________.
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18.
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_____________ affects a DC circuit only when the current is first turned on,
turned off, or when there is a charge in the load resistance.
a. | Capacitance | c. | A time delay | b. | Inductance | d. | A relay |
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Matching
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Segment 1
a. | rotary | e. | solenoid | b. | electromagnetic | f. | magnetic field | c. | coil | g. | vibration | d. | relay |
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19.
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When electrons flow through a conductor, a(n) _________ is created around the
conductor.
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20.
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Winding a conductor into a(n) _____________ will cause the magentic field to
become stronger.
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21.
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___________ devices use magnetic field to produce a desired output.
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22.
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A(n) __________ is most often used to produce linear motion.
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23.
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The buzzing sound produced by a buzzer is cause by the _________ of the
armature as the magnetic field is turned on and off rapidly.
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24.
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A motor produces _________ motion.
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25.
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A(n) ____________ is basically an electrically-controlled switch.
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Segment 2
a. | series | d. | ballast | b. | henrys | e. | Inductance | c. | infinite | f. | five |
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26.
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__________ is the characteristic of an electromagnetic device that opposes any
change in current flow.
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27.
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Inductance is measured in units call __________.
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28.
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There are ________ factors that determine the amount of inductive reactance and
inductor will introduce into a circuit.
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29.
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When inductors are connected in ___________, the total inductance equals the
sum of the individual inductances.
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30.
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A(n) ___________ in a fluorescent light fixture is a special type of
inductor.
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31.
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The resistance of a car’s spark plug is __________ since a spark plug is
an open circuit.
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Segment 3
a. | dielectric | e. | nonpolarized | b. | capacitance | f. | farads | c. | capacitor | g. | Electrolytic | d. | shorted | h. | discharge |
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32.
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A(n) _____________ is a device that can store electrical energy.
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33.
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A(n) __________ capacitor can be used in AC or DC circuits.
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34.
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___________ capacitors provide the most capacitance in the smallest space and
at the least cost.
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35.
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The measure of a capacitor’s ability to store energy is called
___________.
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36.
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Capacitance is measured in units called __________.
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37.
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The insulating material between the plates in a capacitor is called a(n)
__________.
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38.
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It is good practice to ___________ a capacitor to avoid a possible severe
shock.
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39.
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A capacitor can be tested by measuring its resistance with an ohmmeter, which
allows the user to determine if the dielectric is ___________.
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Segment 4
a. | dielectric | e. | reactance | b. | capacitance | f. | current | c. | decreased | g. | increased | d. | open | h. | source |
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40.
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A capacitor in a DC circuit will charge to a voltage equal to the __________
voltage.
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41.
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A charged capacitor act like a _______ in a DC circuit.
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42.
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Current cannot cross the __________ if a DC voltage is applied to a
capacitor.
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43.
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The apparent resistance of a capacitor in an AC circuit is call capacitive
___________.
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44.
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When the AC frequency is increased, the capacitive reactance of a capacitor is
___________.
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45.
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When capacitors are connected in series in an AC circuit, the overall reactance
of the circuit is ___________.
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46.
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Connecting capacitors in parallel in an AC circuit tends to increase the
____________ of the capacitors.
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47.
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When capacitors are connected in parallel, the __________ is increased.
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Segment 5
a. | constant | d. | filtering | b. | ballast | e. | time-delay | c. | capacitor |
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48.
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The inductor used in a dluorescent light fixture is called a(n)
________.
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49.
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An RC timing circuit uses a resistor and a(n) __________ connected in
series.
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50.
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______________ relays often use RC circuits to obtain a desired time
delay.
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51.
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Capacitors and inductors are often used in electric DC power supplies to create
a(n) __________ DC output voltage.
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52.
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Using a capacitor to smooth out changes in a voltage is called ______.
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