7/28/2019 Gibilisco chapter 1
1/100
The atomic number of an element is
determined by
a. the number of neutrons
b. the number of protons
c. the number of neutrons plus the
number of protons
d. the number of electrons
7/28/2019 Gibilisco chapter 1
2/100
The atomic weight of an element is
approximately determined by
a. the number of neutrons
b. the number of protons
c. the number of neutrons plus the
number of protons
d. the number of electrons
7/28/2019 Gibilisco chapter 1
3/100
Suppose there is an atom of oxygen eight
protons and eight neutrons in thenucleus, and two neutrons added to the
nucleus. What is the resulting atomic
weight?
a. 8
b. 10
c. 16d. 18
7/28/2019 Gibilisco chapter 1
4/100
An ion
a. is electrically neutral.
b. has positive electric charge.
c. has negative electric charge.
d. can have either a positive or negative
charge.
7/28/2019 Gibilisco chapter 1
5/100
An isotope
a. is electrically neutral.
b. has positive electric charge.
c. has negative electric charge.
d. can have either a positive or negative
charge.
7/28/2019 Gibilisco chapter 1
6/100
A molecule
a. can consists of a single atom of an
element.
b. always contains two or more elements.
c. always has two or more atoms.
d. is always electrically charged.
7/28/2019 Gibilisco chapter 1
7/100
In a compound,
a. there can be a single atom of an
element.
b. there must always be two or more
elements.
c. the atoms are mixed in which each
other but not joined.
d. there is always a shortage ofelectrons.
7/28/2019 Gibilisco chapter 1
8/100
An electrical insulator can be made a
conductor
a. by heating it.
b. by cooling it.
c. by ionizing it.
d. by oxidizing it.
7/28/2019 Gibilisco chapter 1
9/100
Of the following substances, the worst
conductor is
a. air
b. copper
c. iron
d. salt water
7/28/2019 Gibilisco chapter 1
10/100
Of the following substances, the best
conductor is
a. air
b. copper
c. iron
d. salt water
7/28/2019 Gibilisco chapter 1
11/100
Movement of holes in a semiconductor
a. is like a flow of electrons in the same
direction.
b. is possibly only if the current is high
enough.
c. results in a certain amount of electric
current.
d. causes the material to stopconducting.
7/28/2019 Gibilisco chapter 1
12/100
If a material has low resistance, then
a. it is a good conductor.
b. it is a poor conductor.
c. the current flows mainly in the form of
holes.
d. current can flow only in one direction.
7/28/2019 Gibilisco chapter 1
13/100
A coulomb
a. represents a current of 1 ampere.
b. flows through a 100-watt light bulb.
c. is equivalent to 1 ampere per second.
d. is an extremely large number of charge
carriers.
7/28/2019 Gibilisco chapter 1
14/100
A stroke of lightning
a. is caused by a movement of holes in
an insulator.
b. has a very low current.
c. is a discharge of electrostatic
electricity.
d. builds up between clouds.
7/28/2019 Gibilisco chapter 1
15/100
The volt is the unit of
a. current
b. charge
c. electromotive force
d. resistance
7/28/2019 Gibilisco chapter 1
16/100
If an EMF of 1 volt is placed across a
resistance of 2 ohms, then the current is
a. half an ampere
b. 1 ampere
c. 2 amperes
d. impossible to determine
7/28/2019 Gibilisco chapter 1
17/100
A backward-working electric motor, in
which mechanical rotation is convertedto electricity, is best described as
a. an inefficient, energy wasting device.
b. a motor with voltage connected the
wrong way.
c. an electric generator.
d. a magnetic field.
7/28/2019 Gibilisco chapter 1
18/100
In battery, chemical energy can
sometimes be replenished by
a. connecting it to a light bulb.
b. charging it.
c. discharging it.
d. no means known; when a battery is
dead, you must throw it away.
7/28/2019 Gibilisco chapter 1
19/100
A fluctuating magnetic field
a. produces an electric current in an
insulator.
b. magnetizes the earth.
c. produces a fluctuating electric field.
d. results from a steady electric current.
7/28/2019 Gibilisco chapter 1
20/100
Visible light is converted into electricity
a. in a dry cell.
b. in a wet cell.
c. in an incandescent bulb.
d. in a photovoltaic cell.
7/28/2019 Gibilisco chapter 1
21/100
A positive electric pole
a. has a deficiency of electrons.
b. has fewer electrons than the negative
pole.
c. has an excess of electrons.
d. has more electrons than the negative
pole.
7/28/2019 Gibilisco chapter 1
22/100
An EMF of 1V
a. cannot drive much current through a
circuit.
b. represents a low resistance.
c. can sometimes produce a large
current.
d. drops to zero in a short time.
7/28/2019 Gibilisco chapter 1
23/100
A potentially lethal electric current is on
the order of
a. 0.01 mA.
b. 0.1 mA.
c. 1 mA.
d. 0.1 A.
7/28/2019 Gibilisco chapter 1
24/100
A current of 25 A is most likely drawn by
a. a flashlight bulb.
b. a typical household.
c. a utility power plant.
d. a small radio set.
7/28/2019 Gibilisco chapter 1
25/100
A piece of wire has a conductance of
20S. Its resistance is
a. 20
b. 0.5
c. 0.05
d. 0.02
7/28/2019 Gibilisco chapter 1
26/100
A resistor has a value of 300 ohms. Its
conductance is
a. 3.33 mS
b. 33.3 mS
c. 333 S
d. 0.333 S
7/28/2019 Gibilisco chapter 1
27/100
A span of wire 1km long has a
conductance of 0.6 S. What is theconductance of a span of this same wire
that is 3 km long?
a. 1.8 S.
b. 0.6 S.
c. 0.2 S.
d. More information is necessary todetermine this.
7/28/2019 Gibilisco chapter 1
28/100
Approximately how much current can a
2-kW generator reliably deliver at 117 V?
a. 17 mA.
b. 234 mA.
c. 17 A.
d. 234 A.
7/28/2019 Gibilisco chapter 1
29/100
A circuit breaker is rated for 15 A at 117
V. Approximately how much power doesthis present?
a. 1.76 kW.
b. 1760 kW.
c. 7.8 kW.
d. 0.0078 kW.
7/28/2019 Gibilisco chapter 1
30/100
You are told that an air conditioner has
cooled a room by 500 Btu over a certainperiod of time. What is the amount of
energy in kWh?
a. 147 kWh.
b. 14.7 kWh.
c. 1.47 kWh.
d. 0.147 kWh.
7/28/2019 Gibilisco chapter 1
31/100
Of the following energy units, the most
often used to define electrical energy is
a. the Btu.
b. the erg.
c. the foot-pound.
d. the kilowatt-hour.
7/28/2019 Gibilisco chapter 1
32/100
The frequency of common household ac
in the United States is
a. 60 Hz.
b. 120 Hz.
c. 50 Hz.
d. 100 Hz.
7/28/2019 Gibilisco chapter 1
33/100
Half-rectification means that
a. half of the ac wave is inverted.
b. half of the ac wave is cut off.
c. the whole ac wave is inverted.
d. the effective voltage is half the peak
voltage.
7/28/2019 Gibilisco chapter 1
34/100
In the output of a half-wave rectifier,
a. half of the ac input wave is inverted.
b. the effective voltage is less than that of
the ac input wave.
c. the effective voltage is the same as
that of the ac input wave.
d. the effective voltage is more than that
of the ac input wave.
7/28/2019 Gibilisco chapter 1
35/100
In the output of a full-wave rectifier,
a. half of the ac input wave is inverted.
b. the effective voltage is less than that of
the ac input wave.
c. the effective voltage is the same as
that of the ac input wave.
d. the effective voltage is more than that
of the ac input wave.
7/28/2019 Gibilisco chapter 1
36/100
A low voltage, such as 12 V,
a. is never dangerous.
b. is always dangerous.
c. is dangerous if it is ac, but not if it is
dc.d. can be dangerous under certain
conditions.
7/28/2019 Gibilisco chapter 1
37/100
Which of the following units can be
represent magnetomotive force?
a. The volt-turn
b. The ampere-turn
c. The gaussd. The gauss-turn
7/28/2019 Gibilisco chapter 1
38/100
Which of the following units can
represent magnetic flux density?
a. The volt-turn
b. The ampere-turn
c. The gaussd. The gauss-turn
7/28/2019 Gibilisco chapter 1
39/100
A ferromagnetic material
a. concentrates magnetic flux lines within
itself.
b. increases the total magnetomotive
force around a current-carrying wire.c. causes an increase in the current in a
wire.
d. increases the number of ampere-turnsin a wire.
7/28/2019 Gibilisco chapter 1
40/100
A coil has 500 turns and carries 75 mA of
current. The magnetomotive force is
a. 37,500 At
b. 375 At
c. 37.5 Atd. 3.75 At
7/28/2019 Gibilisco chapter 1
41/100
The attraction or repulsion between two
electrically charged objects is called
a. electromagnetic deflection.
b. electrostatic force.
c. magnetic force.d. electroscopic force.
7/28/2019 Gibilisco chapter 1
42/100
The change in the direction of a compass
needle, when a current-carrying wire isbrought near, is called
a. electromagnetic deflection.
b. electrostatic force.c. magnetic force.
d. electroscopic force.
7/28/2019 Gibilisco chapter 1
43/100
Suppose a certain current in a
galvanometer causes the compassneedle to deflect by 20 degrees, and then
this current is doubled while the polarity
stays the same. The angle of the needle
deflection will
a. decrease.
b. stay the same.c. increase.
d. reverse direction.
7/28/2019 Gibilisco chapter 1
44/100
One important advantage of an
electrostatic meter is the fact that
a. it measures very small currents.
b. it can handle large currents.
c. it can detect and indicate ac voltagesas well as dc voltages.
d. it draws a large current from a power
supply.
7/28/2019 Gibilisco chapter 1
45/100
A thermocouple
a. gets warm when dc flows through it.
b. is a thin, straight, special wire.
c. generates dc when exposed to visible
light.d. generates ac when heated.
7/28/2019 Gibilisco chapter 1
46/100
An important advantage of an
electromagnet-type meter over apermanent-magnet meter is the fact that
a. the electromagnet meter costs much
less.b. the electromagnet meter need not be
aligned with the earths magnetic field.
c. the permanent-magnet meter has amore sluggish coil.
d. the electromagnet meter is more
rugged.
7/28/2019 Gibilisco chapter 1
47/100
Ammeter shunts are useful because
a. they increase meter sensitivity.
b. they make a meter more physically
rugged.
c. they allow for measurement of largecurrents.
d. they prevent overheating of the meter
movement.
7/28/2019 Gibilisco chapter 1
48/100
Voltmeters should generally have
a. high internal resistance.
b. low internal resistance.
c. the greatest possible sensitivity.
d. the ability to withstand large currents.
7/28/2019 Gibilisco chapter 1
49/100
In order to measure the power supply
voltage that is applied to an electrical
circuit, a voltmeter should be placed
a. in series with the dc circuit that works
from the supply.b. between the negative pole of the supply
and the circuit working from the supply.
c. between the positive pole of the supply
and the circuit working from the supply.
d. in parallel with the circuit that works from
the supply.
7/28/2019 Gibilisco chapter 1
50/100
Which of the following will not normally
cause a large error in an ohmmeter
reading?
a. A small voltage between points under
testsb. A slight change in switchable internal
resistance
c. A small changed in the resistance to bemeasured
d. A slight error in the rang switch
position
7/28/2019 Gibilisco chapter 1
51/100
The main advantage of a FETVM over a
conventional voltmeter is the fact that the
FETVM
a. can measure lower voltages.
b. draws less current from the circuitunder tests.
c. can withstand higher voltages safely.
d. is sensitive to ac voltage as well as todc voltage.
7/28/2019 Gibilisco chapter 1
52/100
Which of the following is not a function of a
fuse?
a. To ensure there is enough current
available for an appliance to work right
b. To make it impossible to use appliancesthat are too large for a given circuit
c. To limit the amount of power that a device
can draw from the electrical circuit
d. To make sure the current drawn by an
appliance cannot exceed a certain limit
7/28/2019 Gibilisco chapter 1
53/100
A utility meters motor speed depends
directly on
a. the number of ampere-hours being
used at the time.
b. the number of watt-hours being usedat the time.
c. the number of watts being used at the
time.d. the number of kilowatt-hours being
used at the time.
7/28/2019 Gibilisco chapter 1
54/100
A utility meters readout indicates
a. voltages.
b. power.
c. current.
d. energy.
7/28/2019 Gibilisco chapter 1
55/100
A typical frequency counter
a. has an analog readout.
b. is accurate to six digits or more.
c. works by indirectly measuring current.
d. works by indirectly measuring voltage.
7/28/2019 Gibilisco chapter 1
56/100
A VU meter is never used to get a general
indication of
a. sound intensity.
b. decibels.
c. power in an audio amplifier.d. visible light intensity.
7/28/2019 Gibilisco chapter 1
57/100
The meter movement in an illumination
meter directly measures
a. current.
b. voltage.
c. power.d. energy.
7/28/2019 Gibilisco chapter 1
58/100
An oscilloscope cannot be used to
indicate
a. frequency.
b. wave shape.
c. energy.d. peak signal voltage.
7/28/2019 Gibilisco chapter 1
59/100
Suppose you double the voltage in a
simple dc circuit, and cut the resistance
in half. The current will
a. become four times as great.
b. become twice as great.c. stay the same as it was before.
d. become half as great.
7/28/2019 Gibilisco chapter 1
60/100
You can expect to find a wiring diagram
a. on a sticker on the back of a television
receiver.
b. in an advertisement for a n electric
oven.c. in the service/repair manual for a two-
way radio.
d. in the photograph of the front panel ofa stereo hi-fi tuner.
7/28/2019 Gibilisco chapter 1
61/100
Given a dc voltage source delivering 24V
and resistance of 3.3 k, what is the
current?
a. 0.73 A
b. 138 Ac. 138 mA
d. 7.3 mA
7/28/2019 Gibilisco chapter 1
62/100
Suppose the resistance is 472 , and the
current is 875 mA. The source voltage
must therefore be
a. 413 V.
b. 0.539 V.c. 1.85 V.
d. none of the above.
7/28/2019 Gibilisco chapter 1
63/100
Suppose the dc voltage is 550 mV and
the current is 7.2 mA. Then the
resistance is
a. 0.76
b. 76 c. 0.0040
d. none of the above.
7/28/2019 Gibilisco chapter 1
64/100
Given a dc voltage of 3.5 kV and a
resistance of 220 , what is the current?
a. 16 mA
b. 6.3 mA
c. 6.3 Ad. None of the above
7/28/2019 Gibilisco chapter 1
65/100
Suppose the resistance is 473,332 , and
the current flowing through it is 4.4 mA.
The best expression for the voltage of the
source is
a. 2082 V.b. 110 kV.
c. 2.1 kV.
d. 2.08266 kV.
7/28/2019 Gibilisco chapter 1
66/100
A source delivers 12 V and the current is
777 mA. The best expression for the
resistance is
a. 15 .
b. 15.4 .c. 9.3 .
d. 9.32 .
7/28/2019 Gibilisco chapter 1
67/100
Suppose the voltage is 250 V and the
current is 8.0 mA. The power dissipated
by the potentiometer is
a. 31 mW.
b. 31 W.c. 2.0 W.
d. 2.0 mW.
7/28/2019 Gibilisco chapter 1
68/100
Suppose the voltage from the source is
12 V and the potentiometer is set for 470
. The power dissipated in the resistance
is approximately
a. 310 mW.b. 25.5 mW.
c. 39.2 W.
d. 3.26 W.
7/28/2019 Gibilisco chapter 1
69/100
If the current through the potentiometer
is 17 mA and its resistance is set to 1.22
k, what is the power dissipated by it?
a. 0.24 W
b. 20.7 Wc. 20.7 mW
d. 350 mW
7/28/2019 Gibilisco chapter 1
70/100
Suppose six resistors are hooked up in
series, and each of them has a value of
540 . What is the resistance across the
entire combination?
a. 90 b. 3.24 k
c. 540
d. None of the above
7/28/2019 Gibilisco chapter 1
71/100
If four resistors are connected in series,
each with a value of 4.0 k, the total
resistance is
a. 1 k.
b. 4 k.c. 8 k.
d. 16k.
7/28/2019 Gibilisco chapter 1
72/100
Suppose you have three resistors in
parallel, each with a value of 0.069 M.
Then the total resistance is
a. 23 .
b. 23 k.c. 204 .
d. 0.2 M.
7/28/2019 Gibilisco chapter 1
73/100
Imagine three resistors in parallel, with
values of 22 , 27 , and 33 . If a 12-V
battery is connected across this
combination, what is the current drawn
from the battery?
a. 1.4 A
b. 15 mAc. 150 mA
d. 1.5 A
7/28/2019 Gibilisco chapter 1
74/100
Imagine three resistor, with values of 47
, 68 , and 82 , connected in series
with a 50-V dc generator. The total power
consumed by this network of resistors is
a. 250 mW.b. 13 mW.
c. 13 W.
d. impossible to determine from the datagiven.
7/28/2019 Gibilisco chapter 1
75/100
Suppose you have an unlimited supply of
1-W, 100- resistors. You need to get a
100-, 10-W resistor. This can be done
most cheaply by means of a series-
parallel matrix of
a. 3 x 3 resistors.
b. 4 x 3 resistors.c. 4 x 4 resistors.
d. 2 x 5 resistors.
7/28/2019 Gibilisco chapter 1
76/100
Suppose you have an unlimited supply of 1-
W, 1000- resistors, and you need a 500-
resistance rated at 7 W or more. This can bedone by assembling
a. four sets of two resistors in series, andconnecting these four sets in parallel.
b. four sets of two resistors in parallel, and
connecting these four sets in series.
c. a 3 x 3 series-parallel matrix of resistors.
d. a series-parallel matrix, but something
different than those described above.
7/28/2019 Gibilisco chapter 1
77/100
Suppose you have an unlimited supply of
1-W, 1000- resistors, and you need to
get a 3000-, 5-W resistance. The best
way is to
a. make a 2 x 2 series-parallel matrix.b. connect three of the resistors in
parallel.
c. make a 3 x 3 series-parallel matrix.d. do something other than any of the
above.
7/28/2019 Gibilisco chapter 1
78/100
Good engineering practice usually
requires that a series-parallel resistive
network be assembled
a. from resistors that are all different.
b. from resistors that are all identical.c. from a series combination of resistors
in parallel but not from a parallel
combination of resistors in series.d. from a parallel combination of
resistors in series, but not from a series
combination of resistors in parallel.
7/28/2019 Gibilisco chapter 1
79/100
In a series-connected string of ornament
bulbs, if one bulb gets shorted out, which
of the following will occur?
a. All the other bulbs will go out.
b. The current in the string will go up.c. The current in the string will go down.
d. The current in the string will stay the
same.
7/28/2019 Gibilisco chapter 1
80/100
Imagine that four resistors are connected
in series across a 6.0-V battery, and the
ohmic values are R1=10 , R2=20 ,
R3=50, and R4=100. What is the
voltage across the resistance R2?
a. 0.18 V
b. 33 mV
c. 5.6 mVd. 0.67 V
7/28/2019 Gibilisco chapter 1
81/100
Fill in the blank in the following sentence
to make it true: In a series or parallel dc
circuit, the sum of the ______s in each
component is equal to the total ______
provided by the power supply.
a. current
b. voltage
c. wattaged. resistance
7/28/2019 Gibilisco chapter 1
82/100
In a voltage divider network, the total
resistance
a. should be large to minimize current
drain.
b. should be as small as the powersupply will allow.
c. is not important.
d. should be such that the current is keptto 100 mA.
7/28/2019 Gibilisco chapter 1
83/100
The maximum voltage output from a
voltage divider
a. is a fraction of the power supply
voltage.
b. depends on the total resistance.c. is equal to the supply voltage.
d. depends on the ratio of resistances.
7/28/2019 Gibilisco chapter 1
84/100
Proper biasing in an amplifier circuit
a. causes it to oscillate.
b. prevents an impedance match.
c. can be obtained using a voltage divider
network.d. maximizes current flow.
7/28/2019 Gibilisco chapter 1
85/100
A transistor can be protected from
needless overheating by
a. current-limiting resistor.
b. bleeder resistors.
c. maximizing the drive.d. shorting out the power supply when
the circuit is off.
7/28/2019 Gibilisco chapter 1
86/100
A bleeder resistor
a. is connected across the capacitor in a
power supply.
b. keeps a transistor from drawing too
much current.c. prevents an amplifier from being
overdriven.
d. optimizes the efficiency of an amplifier.
7/28/2019 Gibilisco chapter 1
87/100
Carbon-composition resistors
a. can handle gigantic levels of power.
b. have capacitance or inductance along
with resistance.
c. have essentially no capacitance orinductance.
d. work better for ac than for dc.
7/28/2019 Gibilisco chapter 1
88/100
A logical place for a wirewound resistor
is
a. in a radio-frequency amplifier.
b. in a circuit where a non-inductive
resistor is called for.c. in a low-power radio-frequency circuit.
d. in a high power dc circuit.
7/28/2019 Gibilisco chapter 1
89/100
A metal-film resistor
a. is made using a carbon-based paste.
b. does not have much inductance.
c. can dissipate large amounts of power.
d. has considerable inductance.
7/28/2019 Gibilisco chapter 1
90/100
What type of resistor, or combination of
resistors, would use as the meter-
sensitivity control in a test instrument,
when continuous adjustment is desired?
a. A set of switchable , fixed resistorsb. A linear-taper potentiometer
c. An audio-taper potentiometer
d. A wirewound resistor
7/28/2019 Gibilisco chapter 1
91/100
What type of resistor, or combination of
resistors, would you use as the volume
control in a stereo compactdisc (CD)
player?
a. A set of switchable , fixed resistorsb. A linear-taper potentiometer
c. An audio-taper potentiometer
d. A wirewound resistor
7/28/2019 Gibilisco chapter 1
92/100
If a sound triples in actual power level,
approximately what is this, expressed in
decibels?
a. +3 dB
b. +5 dBc. +6 dB
d. +9 dB
7/28/2019 Gibilisco chapter 1
93/100
Suppose a sound changes in volume by -
13 dB. If the original sound power is 1.0
W, what is the final sound power?
a. 13 W
b. 77 mWc. 50 mW
d. There is not enough information given
here to answer the question.
7/28/2019 Gibilisco chapter 1
94/100
The sound from a portable radio is at a
level of 50 dB. How many times the
threshold of hearing is this, in terms of
actual sound power?
a. 50b. 169
c. 5,000
d. 100,000
7/28/2019 Gibilisco chapter 1
95/100
An advantage of a rheostat over a
potentiometer is the fact that
a. a rheostat can handle higher
frequencies.
b. a rheostat is more precise.c. a rheostat can handle more current.
d. a rheostat works better with dc.
7/28/2019 Gibilisco chapter 1
96/100
A resistor is specified as having a value
of 68 , but is measured with an
ohmmeter as 63 . The value is off by
which of the following percentages?
a. 7.4 %b. 7.9 %
c. 5 %
d. 10 %
7/28/2019 Gibilisco chapter 1
97/100
Suppose a resistor is rated at 3.3 k
5%. This means it can be expected to
have a value between
a. 2970 and 3630 .
b. 3295 and 3305 .c. 3135 and 3465 .
d. 2.8 k and 3.8 k.
7/28/2019 Gibilisco chapter 1
98/100
A package of resistor is rated at 56
10%. You test them with an ohmmeter.
Which of the following values indicates a
reject?
a. 50.0 b. 53.0
c. 59.7
d. 61.1
f 680
7/28/2019 Gibilisco chapter 1
99/100
A resistor has a value of 680 , and you
expect that it will have to draw 1 mA
maximum continuous current in a circuit
youre building. What power rating is
good for this application, but not
needlessly high?
a. W
b. Wc. 1 W
d. 2 W
S 1 k i t ill di i t 1 05
7/28/2019 Gibilisco chapter 1
100/100
Suppose a 1-k resistor will dissipate 1.05
W, and you have a good supply of 1-W
resistors of various ohmic values. If theresroom for 20% resistance error, the cheapest
solution is to use
a. four 1-k, 1-W resistors in series-parallel.
b. a pair of 2.2-k, 1-W resistors in parallel.
c. a set of three 3.3-k, 1-W resistors in
parallel.d. a single 1-k, 1-W resistors, because all
manufacturers allow for a 10% margin of safety
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