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CDC Test 4

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1.
2 points
In a three-wire distribution system, an unbalanced situation is indicated by
2.
2 points
What is the resistance and tolerance of a resistor with a color code of brown, black, red, and
gold?
3.
2 points
You must ensure that the safety analyzers in your shop are calibrated at least how often?
4.
2 points
In a three-branch parallel circuit containing a 4-ohm, 5-ohm, and 6-ohm resistor, the current
is
5.
2 points
The most important value of a sine wave is
6.
2 points
The root-mean-square value is known also as the
7.
2 points
According to Kirchhoff’s law, which statement is correct as applied to three-wire
distribution circuits?
8.
2 points
What is the equivalent resistance of a 30-ohm and 20-ohm resistor connected in parallel
with a source voltage of 24 volts and a total current of 2 amperes?
9.
2 points
What is the frequency of an AC sine wave that repeats itself 500 times in 1/5 of a second?
10.
2 points
What are the two possible states of a Wheatstone bridge?
11.
2 points
An autotransformer possesses which characteristic?
12.
2 points
R1, R2, and R3 in a series circuit are 15, 30, and 45 ohms respectively, and the current through
R3 is 3 amperes. What is the applied voltage?
13.
2 points
Compute the total capacitance of a parallel circuit containing two capacitors: 5 μF and 10
μF.
14.
2 points
) If the voltage across the load is 20 volts and the current through the load is 4 amperes, the
power delivered to the load is
15.
2 points
The total resistance of 10 ohms, 20 ohms, and 25 ohms connected in parallel is
16.
2 points
The phase relationship between current and voltage in a purely inductive circuit is when the
voltage
17.
2 points
If circuit resistance is increased from 4 ohms to 6 ohms and the applied voltage remains at 12
volts, the current
18.
2 points
Which capacitor type is polarized?
19.
2 points
An alternating-current generator made to deliver 60 hertz, with two field poles, needs an
armature rotating at
20.
2 points
With 100 volts applied across ten 50-ohm resistances in parallel, the current through each
resistance equals
21.
2 points
Which factor does not affect capacitance?
22.
2 points
In a charged capacitor
23.
2 points
When you select a capacitor for use in a circuit, its working voltage should be at least
24.
2 points
According to the text, when must you perform electrical safety tests on battery-powered
equipment?
25.
2 points
If the voltage developed across the load is 4 volts and the load resistance is 8 ohms, the
power dissipated in the load is
26.
2 points
Which electrical safety test introduces line voltage to the leads of a device?
27.
2 points
When choosing a capacitor for a circuit the maximum safe voltage of a capacitor is the
28.
2 points
The sum of the power absorbed by all loads within a voltage divider is equal to the
29.
2 points
Total electrical energy (W) expended in an electrical circuit can be defined as the product of
30.
2 points
Most voltage measurements used to check proper circuit operation in electronic equipment
are taken with respect to
31.
2 points
In a simple capacitor, the plate area is two square inches, the dielectric material is air, and
the distance between the plates is 0.01 inch (0.254 mm). To increase the capacitance,
32.
2 points
What two parameters are measured by the galvonometer of a Wheatstone bridge?
33.
2 points
Four resistors of 20 ohms, 30 ohms, 50 ohms, and 60 ohms are connected in series across a
battery rated at 110 volts. Determine the total resistance of the circuit.
34.
2 points
Capacitance is the property of an electrical device or circuit that
35.
2 points
What is the relationship between current, voltage, and resistance in a circuit?
36.
2 points
What is the opposition a coil offers to alternating current called and what is it measured in?
37.
2 points
If three resistors of 2, 4, and 6 ohms were connected in parallel, which resistor would
dissipate the greatest power?
38.
2 points
When two coils are located so the flux from one coil links with the turns of the other coil, a
change in flux in one coil causes an EMF to be induced in the other coil. This is called
39.
2 points
Inductance can be considered the property of a circuit that
40.
2 points
If applied voltage of 48 volts produces a circuit current of 0.5 amperes, the circuit resistance
is
41.
2 points
Blocking direct current, filtering, and spark suppression are common applications of
42.
2 points
What is the resistance and tolerance of a resistor with a code of red, red, black, and silver?
43.
2 points
When a multimeter is set to make current measurements, what characteristic makes it
particularly susceptible to damage?
44.
2 points
In a series circuit, R1, R2, and R3 are 20 ohms each and the applied voltage is 180 volts. The
current through R2 is
45.
2 points
If a transformer with a turns ratio of 1:4 has a primary voltage of 20 volts, the secondary
voltage will be
46.
2 points
Maximum power is transferred from a source to a load when the load resistance is equal to
47.
2 points
An alternating-current generator converts
48.
2 points
When using an ohmmeter in a circuit, always
49.
2 points
Connecting capacitors in parallel causes the plate area to
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