Which of the following devices is connected internally to


1. To obtain the greatest possible accuracy in a timing device, you should use a

A. digital timer operated from a crystal-controlled oscillator.

B. 3905 IC operated through an electronic inductor.

C. timer with a unijunction transistor in its circuit.

D. 555 IC operated through an electronic capacitor.

2. You have two methods of locating faults in electronic systems - signal tracing and signal

A. dumping. C. shaping.

B. injecting. D. squaring.

3. Which one of the following distinguishes a switching power supply from other power suppliers?

A. Simpler circuitry C. Higher output voltage

B. Smaller transformer D. Elimination of diode rectifier

4 Which of the following devices is connected internally to an output pin of a 555 IC?

A. RS flip-flop C. Reset transistor

B. Power amplifier D. Threshold comparator

5. In troubleshooting a pulse circuit by waveform comparison, you should use

A. a logic probe. C. an oscilloscope.

B. a logic scope. D. a pulser.

6. The most convenient and least time-consuming method of determining an amplifier's ability to pass a pulse in a digital circuit is to use the

A. sine-wave test. C. VOM test.

B. square-wave test. D. Wattmeter test.

7. "An output of a high from a logic gate having a high on only one input" describes the operation of

A. an AND gate. C. an NOR gate.

B. a NOT gate. D. ah XOR gate.

8. A one-shot multivibrator contains two transistors. What is the condition of the transistors in the standby state?

A. Input transistor is cut off; output transistor is saturated.

B. Output transistor is cut off; input transistor is saturated.

C. Both transistors are saturated.

D. Both transistors are cut off.

9. You would use a logic analyzer to test

A. voltage values. C. an ac amplifier.

B. a digital integrated circuit. D. a system's power supply.

10. When you hold down the switch in most types of pulsers, the instrument will generate a

A. clock waveform. C. single pulse.

B. sine wave. D. triangular wave.

11. The input trigger pulse to the 3905 timer must be

A. negative-going to pin 1. C. negative-going to pin 2.

B. positive-going to pin 1. D. positive-going to pin 2.

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