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08600300
. A circuit contains a 10 µF capacitor and a 30 µF capacitor connected
in parallel. What is the total capacitance of the circuit?
A. 7.5 µF
B. 20 µF
C. 40 µF
D. 47 µF
2. What is the time constant of a 2 mH inductor and a 200 W resistor
connected in series?
A. 10 msec
B. 1 msec
C. 10 µsec
D. 1 µsec
3. Which of the following dielectric materials has the highest dielectric
constant?
A. Porcelain
B. Oil
C. Paraffined paper
D. Distilled water
4. What type of capacitor has great stability and is up to three times
smaller than a standard electrolytic capacitor?
A. Tantalum
B. Paper
C. Mica
D. Ceramic
5. What is the time constant of a 0.05 µF capacitor connected in series
with a 200 kW resistor?
A. 1 s
B. 0.1 s
C. 0.01 s
D. 10 s
6. What is the total inductance of a circuit that contains two 10 µH
inductors connected in parallel?
A. 5 µH
B. 8 µH
C. 15 µH
D. 20 µH
7. An inductor stores a charge
A. in the electric field between its plates.
B. as a magnetic field in its dielectric.
C. as a magnetic field surrounding the conductor.
D. in an insulating material in the circuit.
8. If an RC circuit is supplied with 24 VDC and the circuit is in its third
time constant, how much voltage would be present across the
capacitor?
A. 20.71 VDC
B. 22.77 VDC
C. 23.50 VDC
D. 22.80 VDC
9. What type of capacitor uses aluminum oxide as its dielectric?
A. Mica
B. Ceramic
C. Paper
D. Electrolytic
10. A circuit contains a 10 pF capacitor and a 50 pF capacitor
connected in parallel. What is the total capacitance of this circuit?
A. 8.3 pF
B. 25 pF
C. 50 pF
D. 60 pF
11. A circuit contains a 20 µF capacitor and a 60 µF capacitor
connected in series. What is the total capacitance of the circuit?
A. 12 µF
B. 15 µF
C. 30 µF
D. 80 µF
12. In an RC circuit, after which of the following time constants is a
capacitor considered to be fully charged?
A. The first
B. The third
C. The fifth
D. The fourth
13. What is the typical insulation resistance for a mica capacitor?
A. 1 MW
B. 10 KW
C. 1,000 MW
D. 10,000 µW
14. What type of meter is used to directly find the capacitance value of
an unknown capacitor or to check the condition of a known capacitor?
A. LCR meter
B. VOM meter
C. Megohm meter
D. Oscilloscope
15. An RC circuit contains a 1,000 W resistor and a 0.1 µF capacitor.
What is the time constant of this circuit?
A. 0.01 s
B. 0.0001 s
C. 1 s
D. 0.1 s
16. An electronic circuit has a 60 mH inductor and a 30 mH inductor
connected in parallel. What is the total inductance of the circuit?
A. 90 mH
B. 75 mH
C. 35 mH
D. 20 mH
17. Which of the following capacitor types has the lowest insulation
resistance and therefore, the highest leakage current?
A. Mica
B. Ceramic
C. Electrolytic
D. Tantalum
18. Which of the following values is equal to one picofarad?
A. 1 × 10-3 F
B. 1 × 10-6 F
C. 1 × 10-10 F
D. 1 × 10-12 F
19. On an electrolytic or paper capacitor, what does the black band
indicate?
A. That the capacitor's negative lead is near the band
B. That the capacitor has a value less than 10 mF
C. That the capacitor's voltage rating is less than 100 VDC
D. That the capacitor is color coded to military specifications
20. A mica capacitor has in order, the color codes red, orange, and
yellow. What is the capacitance value of this capacitor in microfarads?
A. 0.23 µF
B. 2.3 µF
C. 23 µF
D. 230 µF
21. After the third time constant, what is the current in an inductor if
the steady state circuit current is 10 amps?
A. 7.43 A
B. 8.60 A
C. 9.490 A
D. 10.00 A
22. What is the time constant of a 5 mH inductor and a 200 W resistor
connected in series?
A. 100 µs
B. 10 µs
C. 25 µs
D. 0.25 µs
23. What is the purpose of placing a large electrolytic capacitor in the
output side of a power supply?
A. To rectify the AC current
B. To remove AC ripple from the DC output
C. To hold a charge after the supply is turned off
D. To prevent the DC from reversing polarity
24. An inductor can be placed in series with a motor to provide
A. braking for the motor.
B. heat reduction in the motor windings.
C. faster motor response to driver signals.
D. less current feedback to the driver.
25. What action should always be taken before working on a circuit
with an electrolytic capacitor or another large capacitor?
A. Disconnect the bleeder resistor.
B. Place the VOM's leads directly to the capacitor.
C. Check the capacitor with an LCR meter.
D. Discharge the capacitor.
08600400
1. Magnetic flux is pushed through a magnetic path by
A. reluctance.
B. hysteresis.
C. electromotive force.
D. magnetomotive force.
2. Which of the following units is used to measure magnetic flux
density?
A. Gauss
B. Maxwell
C. Weber
D. Watt
3. Which of the following is an electromagnetic device that can operate
a switch when current flows through its coil?
A. A bar magnet
B. A horseshoe magnet
C. A relay
D. A core
4. The area inside the hysteresis loop represents
A. residual magnetism.
B. magnetic saturation.
C. energy.
D. permeability.
5. If you dip a bar magnet into iron filings, the filings will stick to
A. both poles of the magnet.
B. the whole magnet.
C. only the north pole of the magnet.
D. only the south pole of the magnet.
6. How do lines of magnetic force travel?
A. From the magnet's south pole to its north pole
B. From the magnet's north pole to its south pole
C. From the magnet's neutral line to its poles
D. From the magnet's poles to its neutral line
7. Which of the following is a magnetic material?
A. Glass
B. Paper
C. Wood
D. Iron
8. Which of the following illustrations shows a closed magnetic circuit?
A.
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B.
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C.
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D.
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9. In this figure, a conductor is connected to a battery and placed
between two compasses. An electric current is then passed through
the conductor. In what direction do the north poles of the compasses
point?
A. In the same direction as the magnetic lines of force
B. In the opposite direction from the magnetic lines of force
C. In the same direction as the flow of current through the conductor
D. In the opposite direction from the flow of current through the
conductor
10. What theory of current flow says that electric current flows from
the positive side of the source, through the load, to the negative side
of the source?
A. Electron theory
B. Conventional theory
C. Static theory
D. Magnetic theory
11. An artificial magnet made by pressing magnetic powder together
under high pressure and temperature is called a
A. powder core magnet.
B. rare earth magnet.
C. polyform magnet.
D. semisteel magnet.
12. If a current of 5 amperes flows through a coil made up of 40 turns
of wire, the amount of MMF generated is
A. 8 ampere-turns.
B. 35 ampere-turns.
C. 45 ampere-turns.
D. 200 ampere-turns.
13. Which of the following are used to connect a DC power supply to
the armature of a DC motor?
A. Field poles
B. Armature poles
C. Carbon brushes
D. Plungers
14. The opposition to magnetic flux as it flows through a magnetic
circuit is
A. reluctance.
B. hysteresis.
C. permeability.
D. resistance.
15. What happens to a magnetic material when further application of
MMF brings only a slight change in magnetism in the material?
A. The material begins to heat rather than absorb more magnetism.
B. The material begins to lose its magnetic properties.
C. The material is termed saturated.
D. The material is said to have low hysteresis.
16. When using Fleming's right-hand rule for generator action of
electromagnetic induction, the forefinger points in the direction of the
A. current flow.
B. conductor motion.
C. coils windings.
D. magnetic flux.
17. What part of a relay is used to support the major components of
the relay?
A. Armature
B. Frame
C. Contact spring
D. Contact set
18. When a voltage is induced on a moving conductor in a magnetic
field, current will only flow if the conductor is
A. formed into a coil.
B. moving slowly.
C. part of a closed circuit.
D. large enough in diameter.
19. In a solenoid, where is the magnetic field strongest?
A. Outside the coil
B. Inside the coil
C. At the north pole
D. At the south pole
20. What is a typical coil voltage for a low-voltage relay circuit?
A. 2 VDC
B. 5 VDC
C. 12 VDC
D. 120 VDC
21. Electromagnetic stepping switches operate by
A. pulsing current to the electromagnet.
B. energizing a set and then reset coil.
C. placing 24 VDC on the coil and letting the switch cycle
automatically.
D. placing a control voltage on the contacts of the switch.
22. The center of a bar magnet where no magnetic force is present is
called the
A. pole.
B. neutral line.
C. axis.
D. keeper.
23. If you double the distance an object is away from a source of
magnetism, how much loss will there be in magnetic flux?
A. The flux will be one-half as strong.
B. The flux will be one-quarter as strong.
C. The flux will be one-fifth as strong.
D. The flux will be one-eighth as strong.
24. What is the amount of MMF generated by a 50-turn
electromagnetic coil supplied by 12 VDC at a current of one ampere?
A. 12 ampere-turns
B. 38 ampere-turns
C. 50 ampere-turns
D. 600 ampere-turns
25. Which of the following relative permeability values describes a
vacuum?
A. 1
B. 50
C. 100
D. 1,000