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6. (402) Total electrical energy (W) expended in an electrical circuit can be defined as the product of

a. power and time.
 
7. (403) 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.

c. 160 ohms.
 
8. (403) In a series circuit, R
1, R2, and R3
are 20 ohms each and the applied voltage is 180 volts. The
current through R
2
is

b. 3 amperes.
 
9. (403) R
1, R2, and R3
in a series circuit are 15, 30, and 45 ohms respectively, and the current through
R
3
is 3 amperes. What is the applied voltage?

c. 270 volts.
 
10. (403)
Maximum
power is transferred from a source to a load when the load resistance is equal to

a. the internal resistance of the source.
 
11. (403) Most voltage measurements used to check proper circuit operation in electronic equipment
are taken with respect to

d. ground.
 
12. (404) In a threebranch parallel circuit containing a 4ohm, 5ohm, and 6ohm resistor, the current
is

a. highest through the 4ohm resistor.
 
13. (404) With 100 volts applied across ten 50ohm resistances in parallel, the current through each
resistance equals

a. 2 amps.
 
14. (405) The total resistance of 10 ohms, 20 ohms, and 25 ohms connected in parallel is

d. 10.52 ohms.
 
15. (405) What is the equivalent resistance of a 30ohm and 20ohm resistor connected in parallel
with a source voltage of 24 volts and a total current of 2 amperes?

a. 12 ohms.
 
16. (405) If three resistors of 2, 4, and 6 ohms were connected in parallel, which resistor would
dissipate the greatest power?

b. The 2ohm resistor.
 
17. (406) What is the resistance of branch “a” (R
3, R4, R5
) in figure T–1?

b. 50 ohms.
 
18. (406) What is the resistance of branch “b” in figure T–1?

b. 50 ohms.
 
19. (406) What is the total resistance for the circuit in figure T–1?

b. 50 ohms.
 
20. (406) What is the total circuit current in figure T–1?

c. 5 amps.
 
21. (406) What is the voltage across R
1
in figure T–1?

c. 125 volts.
 
22. (406) What is the current through branch “a” in figure T–1?

b. 2.50 amps.
 
23. (407) The sum of the power absorbed by all loads within a voltage divider is equal to the

a. power produced by the source.
 
24. (408) What are the two possible states of a Wheatstone bridge?

c. Balanced and unbalanced.
 
25. (408) What two parameters are measured by the galvonometer of a Wheatstone bridge?

d. Magnitude and direction of current flow.
 
26. (409) In a threewire distribution system, an unbalanced situation is indicated by

d. current flow in the neutral wire.
 
27. (409) According to Kirchhoff’s law, which statement is correct as applied to threewire
distribution circuits?

a. Algebraic sum of all the voltages about a closed path is zero.
 
28. (409) What is the resistance and tolerance of a resistor with a color code of brown, black, red, and
gold?

c. 1K ohm, ±5 percent.
 
29. (409) What is the resistance and tolerance of a resistor with a code of red, red, black, and silver?

a. 22 ohms, ±10 percent.
 
30. (410) An alternatingcurrent generator converts

a. mechanical energy into electrical energy.
 
31. (410) An alternatingcurrent generator made to deliver 60 hertz, with two field poles, needs an
armature rotating at

d. 3,600 rpm.
 
32. (410) What is the frequency of an AC sine wave that repeats itself 500 times in 1/5 of a second?

d. 2,500 Hz.
 
33. (410) The rootmeansquare value is known also as the

c. effective value.
 
34. (410) The most important value of a sine wave is

b. effective value.
 
35. (411) Inductance can be considered the property of a circuit that

a. opposes a change in current flow.
 
36. (411) 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

b. mutual inductance.
 
37. (411) The phase relationship between current and voltage in a purely inductive circuit is when the
voltage

a. leads current by 90°.
 
38. (412) If a transformer with a turns ratio of 1:4 has a primary voltage of 20 volts, the secondary
voltage will be

c. 80 volts.
 
39. (412) An autotransformer possesses which characteristic?

a. Contains one winding.
 
40. (413) Capacitance is the property of an electrical device or circuit that

b. opposes any change of voltage.
 
41. (413) Which factor does
not
affect capacitance?

b. Thickness of the plates.
 
42. (413) 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,

a. change the dielectric material from air to mica.
 
43. (413) When you select a capacitor for use in a circuit, its working voltage should be
at least

d. 50 percent greater than the highest voltage to be applied to it.
 
44. (414) In a charged capacitor

b. one plate contains more free electrons.
 
45. (415) Connecting capacitors in parallel causes the plate area to

a. increase and capacitance to increase.
 
46. (415) Compute the total capacitance of a parallel circuit containing two capacitors: 5 μF and 10
μF.

c. 15 μF.
 
47. (416) Which capacitor type is polarized?

d. Electrolytic.
 
48. (416) When choosing a capacitor for a circuit the
maximum
safe voltage of a capacitor is the

b. capacitor’s working voltage.
 
49. (416) Blocking direct current, filtering, and spark suppression are common applications of

d. capacitors.
 
50. (417) What is the opposition a coil offers to alternating current called and what is it measured in?

c. Inductive reactance, ohms.
 
51. (417) What is the capacitive reactance of a 53 μF capacitor at 30 Hz?

d. 100 ohms.
 
52. (418) The creation of a magnetic field through the use of current is called

d. electromagnetism.
 
53. (418) Using the lefthand rule to determine the magnetic polarity of a solenoid, you should grasp
the

a. coil with the fingers in the direction of the current and the thumb pointing to the north pole.
 
54. (419) What are the three
basic
types of directcurrent motors?

a. Series, shunt, and compound.
 
55. (419) When the load on a series DC motor is increased,

b. the armature speed is decreased.
 
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