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| 1. If the op-amp in the circuit of Figure 1-1 is working properly, the signal voltage |
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| 2. If a unit under test appears to be dead, what is the first area that should be |
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| C. middle functional block |
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| 3. What symptom would be observed if the feedback resistor on a non-inverting |
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| C. output only at positive and negative saturation |
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| D. an overheated op-amp chip |
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| 4. Using the proper ohmmeter, resistance tests in both directions are performed |
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| across a silicon diode which has been removed from a circuit. Both tests indicate |
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| high resistance. What can be concluded? |
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| A. it is a good component |
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| D. no conclusions until a power test is performed |
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| 5. What output should be seen in the circuit of Figure 1-2? |
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| 6. What symptom would likely be observed when the emitter bypass capacitor opens |
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| A. no symptom is observable |
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| D. overheated emitter resistor |
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| 7. What Vcc power supply voltage should be observed in TTL circuits? |
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| 8. What device is often used to protect systems from very fast, momentary, voltage |
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| 9. What is the DC output of a Class A amplifier designed for maximum DC |
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| compliance, with no signal applied, and powered by 12 volts? |
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| 10. What indication is seen when resistance testing a good fuse? |
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| C. low resistance in one direction and high resistance in the other direction |
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| D. approximately 1000 ohms in both directions |
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| 11. If a diode in a bridge rectifier opens, the observable symptom is: |
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| A. there is no observable symptom |
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| B. increased ripple/decreased DC output under load |
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| C. the remaining bridge diodes fail due to overload |
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| D. the primary fuse blows |
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| 12. The primary frequency of a fully loaded switching power supply might be about: |
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| 13. If a diode in a bridge rectifier shorts, the most likely observable symptom is: |
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| A. there is no observable symptom |
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| B. increased ripple/decreased DC output under load |
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| C. the remaining bridge diodes fail due to overload |
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| D. the primary fuse blows |
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| 14. Which segments on a seven segment display should be lit to display the number |
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| 15. If 4 volts is applied to the non-inverting input and 3.5 volts is applied to the |
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| inverting input of a differential amplifier configured for a gain of 10, the output |
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| 16. What logic probe indication should be viewed on the data lines of a normally |
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| operating microprocessor based system? |
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| 17. What is the frequency of the signal of Figure 1-3 if the time/division is set to 50 |
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| 18. Which instrument should always be used with the power disconnected in the |
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| 19. An ohmmeter test across the anode-cathode (with the gate unconnected) of an out |
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| of circuit SCR shows low resistance in both directions. What would you conclude |
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| A. it is defective, probably shorted |
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| B. it is defective, probably open |
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| C. it is a good component |
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| D. no conclusions until a power test is performed |
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| 20. A switching power supply should initially be tested: |
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| C. at reduced input voltage |
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| D. at reduced input frequency |
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| 21. Which of the following must a grounding wrist strap have? |
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| A. a static collector band liner |
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| B. a Velcro adjustable band |
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| C. a direct short to ground to drain charge |
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| D. a large resistance in series with the technician |
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| 22. The indications shown on Figure 1-4 were obtained using a logic probe. What |
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| conclusion can be drawn from the indications? |
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| A. the circuit is functioning properly |
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| B. the circuit is probably functioning properly, but an oscilloscope test is |
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| C. the circuit is not functioning properly |
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| D. the circuit is probably not functioning properly, but an oscilloscope test |
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| is needed to confirm this |
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| 23. What resistance indication should be obtained when testing a functional diode |
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| with an analog multimeter having sufficient voltage at the terminals? |
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| A. low resistance in both directions |
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| B. high resistance in both directions |
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| C. high resistance in one and low resistance in the other direction |
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| D. no indication, since an analog meter generally won |
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| 24. What potential should be placed on the gate of an SCR when performing a simple |
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| D. answer depends on whether an NPN or PNP SCR is used |
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| 25. What logical level would be represented by an output of 1.5 volts in a TTL digital |
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| D. 1.5 volts is not a valid logic high or low |
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| 26. What effect does increasing the base bias, making it more positive, have on the |
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| A. the current remains unchanged |
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| D. M1 leads would need to be switched |
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| 27. What should the impedance of meter M2 in the circuit of figure 1-5 be to obtain |
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| the least amount of loading? |
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| B. equal to the impedance of the emitter resistor |
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| C. equal to the dynamic impedance of the transistor |
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| 28. How is the voltmeter connected to measure the voltage developed in a |
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| A. in series with the component |
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| B. in parallel with the component |
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| C. remove the component and replace it with the meter |
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| D. momentarily open the component and measure its voltage |
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| 29. When using an ohmmeter to test an SCR, the SCR can often be fired by: |
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| A. momentarily shorting the gate to the cathode |
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| B. momentarily shorting the gate to the anode |
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| C. momentarily shorting the base to the cathode |
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| D. momentarily shorting the base to the emitter |
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| 30. What indication should be seen when viewing a microprocessor |
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| 31. Which coupling technique would be used to view a 50 mV noise signal riding on |
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| top of a 12 volt DC level? |
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| 32. Which of the following is not indicated by a logic probe? |
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| A. a voltage in the logic high region |
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| B. a voltage in the logic low region |
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| C. a voltage in the undefined region |
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| D. the magnitude of a voltage in the undefined region |
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| 33. On which of the following instruments would the occasional presence of the |
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| signal in Figure 1-6 be the easiest to detect? |
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| 34. Which oscilloscope control determines the input voltage level required to start the |
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| D. vertical coupling control |
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| 35. Which of the following instruments would be most suitable for analyzing a |
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| continuous 10M Hz signal? |
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| 36. Which of the following voltmeter input impedances provides for the least amount |
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| 37. You are using an oscilloscope with an X10 probe. Because of the probe you |
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| A. divide the frequency reading by 10 |
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| B. multiply the frequency reading by 10 |
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| C. divide the voltage reading by 10 |
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| D. multiply the voltage reading by 10 |
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| 38. Observation of two low frequency signals, about 60 Hz, on a dual trace scope |
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| generally requires the use of the: |
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| 39. The combined input impedance of an oscilloscope and a 10X probe is generally: |
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| C. adjustable with the triggering source control |
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| D. adjustable with the triggering level control |
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| 40. The compensation adjustment of an oscilloscope probe is usually performed when |
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| 41. Which of the following voltage levels represents a valid high in most TTL |
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| 42. Which of the following SCR firing techniques produces the lowest RFI noise? |
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| 43. What function does the optocoupler serve in a solid state relay? |
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| 44. Which kind of memory retains its contents only as long as power is applied? |
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| 45. What is the output of the logic circuit of Figure 1-7? |
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| 46. What is the gain of the amplifier in Figure 1-8? |
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| 47. What is the approximate output of the comparator of Figure 1-9? |
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| 48. If the J input of a JK flip-flop is high and the K input is low, what is the level on |
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| the Q output after the next clock pulse? |
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| D. the opposite of its pre-clock state |
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| 49. If 100 mV is applied to the op-amp circuit of Figure 1-10, what output voltage is |
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| 50. If the voltage applied to the inverting input of a comparator is less positive than |
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| that applied to the non-inverting input, what is the approximate output voltage? |
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| A. -Vs (the negative supply voltage) |
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| B. +Vs (the positive supply voltage) |
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| D. the voltage level applied to the inverting input |
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| 51. What is the relative size of the gate current required to fire an SCR and the anode |
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| load current when it is conducting? |
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| A. a small gate current and a large anode current |
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| B. a small gate current and a small anode current |
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| C. a large gate current and a small anode current |
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| D. a large gate current and a large anode current |
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| 52. What polarity voltage (with respect to the cathode) is applied to the gate of an |
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| 53. If 18 volts is applied to the circuit of Figure 1-11, how much voltage would be |
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| normally measured across RI? |
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| 54. Which lead of a TRIAC generally controls the triggering of the device? |
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| 55. How much voltage should be dropped across the emitter-base junction of a silicon |
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| NPN transistor connected in a common emitter circuit if the amp is biased for |
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| 56. If 0.5 volts peak-to-peak is applied to the input of the amplifier shown in Figure |
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| 1-12, what is the approximate output voltage? |
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| D. Cannot be determined without transistor data |
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| 57. During normal operation, how is the base-emitter junction of a Class A amplifier |
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| 58. About how much voltage would be dropped across a reverse biased silicon diode? |
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| 59. Generally, how much opposition to current flow is offered by a conducting , |
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| forward biased PN junction silicon diode? |
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| B. relatively large opposition |
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| C. relatively little opposition |
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| 60. About how much voltage would be dropped across a forward biased silicon |
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| 61. What is the resonant frequency of the circuit of Figure 1-13? |
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| 62. What is the impedance of the circuit of Figure 1-13? |
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| 63. As the frequency of the AC signal applied to a capacitor is increased, how does its |
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| D. reactance does not apply to capacitance |
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| 64. What is the approximate inductive of a 10 mH inductor in a 3.58 MHz circuit? |
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| 65. What is the effective (RMS) voltage of 1.0 volt peak-to-peak signal? |
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| 66. How much voltage is dropped across a 10K ohms resistor that is in series with a |
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| 20K ohms resistor, when 10 volts is applied to the series circuit? |
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| 67. How much current is flowing through R3 of Figure 1-14? |
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| 68. What is the voltage across R2 in the circuit of Figure 1-15? |
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| R210KR110KR310KR410KV=10V |
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| 69. What is the current through R1 in the circuit of Figure 1-15? |
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| 70. How does the current flowing through a resistor change if the voltage applied to it |
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| D. the kind of circuit, series or parallel, must be known |
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| 71. Which of the following represents an acceptable 2.2K ohms 10% tolerance |
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| 72. What is the decimal equivalent of binary 110101? |
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| 73. What is the peak voltage of a 2 volt effective (RMS) signal? |
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| 74. Which of the following is equivalent to .2 milliamps? |
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| 75. What is the frequency of a signal which has a cycle time of 100 microseconds? |
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