EET 3086 FINAL EXAM UPDATED QUESTIONS
AND CORRECT ANSWERS
Question:
1. The resistance of a 35 cm length of copper with a cross-sectional area of 0.03 cm2 is
Answer:
2 mΩ
Question:
2. The guaranteed range of measured values for a 68 kΩ resistor with a 5% tolerance is
Answer:
64.6 kΩ minimum; 71.4 kΩ maximum
Question:
3. In a dual dc power supply, the terminal that is common to both voltage sources, is the
Answer:
ground terminal
Question:
4. Which of the following AWG wire sizes has the largest current-carrying capacity?
Answer:
0000
Question:
5. Which type resistor is most commonly found in high-power electrical applications?
Answer:
carbon-composition resistor
Question:
6. In order to measure current
Answer:
you must install the meter in the current path
Question:
7. A resistor is connected across a 50 V source. What is the maximum current possible in the circuit if the
resistor is color-coded at red, orange, orange, silver?
Answer:
2.42 mA
Question:
8. A voltage source (VS) with 30 Ω of internal resistance (RS) has a no-load output of 15 V. The voltage
across the load (VL) when the load resistor (RL) is 1 k Ω is
Answer:
0V
, Question:
9. A circuit consists of two resistors in series, an R1 of 470 Ω and an R2 of 680 Ω, across a 24-V source.
An RL of 68 Ω is placed across R2. The values of VL and VNL are
Answer:
VL = 2.79 V, VNL = 14.19 V
Question:
10. A circuit consists of two opposing voltage sources: a VA of 15 V and a VB of 9 V. There are three
resistors: an R1 of 27 Ω, an R2, of 16 Ω, and an R3 of 8 Ω. One end of R1 is connected to the + side of VA
while one end of R2 is connected to the + end of VB. The remaining leads of R1 and R2 are connected
together along with one end of R3. The other end of R3 is connected to the negative end of both VA and
VB. The voltage across R1 is
Answer:
10.03 V
Question:
11. A bar magnet has five lines of force cutting one square centimeter (1 cm2). Assuming that each line of
force represents 30 µWb of flux, the flux density for the magnet is
Answer:
1.5 T
Question:
12. Which is not a common cause of loss of magnetic strength for a permanent magnet?
Answer:
allowing the magnet to be jarred or dropped
Question:
13. The ability of a material to retain its magnetic characteristics is called
Answer:
retentivity
Question:
14. An ac sine wave has a frequency of 25 kHz. The time from the start of the cycle until the θ = 140°
point on the waveform is
Answer:
E 15.6 µs
Question:
15. A sine wave with a dc offset has
Answer:
a full-cycle average that is not equal to zero unequal positive and negative peak value an average value that
is equal to the value of the dc offset
Question:
16. The wavelength (in meters) for a 140 MHz sine wave is
Answer:
2.14 m
AND CORRECT ANSWERS
Question:
1. The resistance of a 35 cm length of copper with a cross-sectional area of 0.03 cm2 is
Answer:
2 mΩ
Question:
2. The guaranteed range of measured values for a 68 kΩ resistor with a 5% tolerance is
Answer:
64.6 kΩ minimum; 71.4 kΩ maximum
Question:
3. In a dual dc power supply, the terminal that is common to both voltage sources, is the
Answer:
ground terminal
Question:
4. Which of the following AWG wire sizes has the largest current-carrying capacity?
Answer:
0000
Question:
5. Which type resistor is most commonly found in high-power electrical applications?
Answer:
carbon-composition resistor
Question:
6. In order to measure current
Answer:
you must install the meter in the current path
Question:
7. A resistor is connected across a 50 V source. What is the maximum current possible in the circuit if the
resistor is color-coded at red, orange, orange, silver?
Answer:
2.42 mA
Question:
8. A voltage source (VS) with 30 Ω of internal resistance (RS) has a no-load output of 15 V. The voltage
across the load (VL) when the load resistor (RL) is 1 k Ω is
Answer:
0V
, Question:
9. A circuit consists of two resistors in series, an R1 of 470 Ω and an R2 of 680 Ω, across a 24-V source.
An RL of 68 Ω is placed across R2. The values of VL and VNL are
Answer:
VL = 2.79 V, VNL = 14.19 V
Question:
10. A circuit consists of two opposing voltage sources: a VA of 15 V and a VB of 9 V. There are three
resistors: an R1 of 27 Ω, an R2, of 16 Ω, and an R3 of 8 Ω. One end of R1 is connected to the + side of VA
while one end of R2 is connected to the + end of VB. The remaining leads of R1 and R2 are connected
together along with one end of R3. The other end of R3 is connected to the negative end of both VA and
VB. The voltage across R1 is
Answer:
10.03 V
Question:
11. A bar magnet has five lines of force cutting one square centimeter (1 cm2). Assuming that each line of
force represents 30 µWb of flux, the flux density for the magnet is
Answer:
1.5 T
Question:
12. Which is not a common cause of loss of magnetic strength for a permanent magnet?
Answer:
allowing the magnet to be jarred or dropped
Question:
13. The ability of a material to retain its magnetic characteristics is called
Answer:
retentivity
Question:
14. An ac sine wave has a frequency of 25 kHz. The time from the start of the cycle until the θ = 140°
point on the waveform is
Answer:
E 15.6 µs
Question:
15. A sine wave with a dc offset has
Answer:
a full-cycle average that is not equal to zero unequal positive and negative peak value an average value that
is equal to the value of the dc offset
Question:
16. The wavelength (in meters) for a 140 MHz sine wave is
Answer:
2.14 m
