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(c) the single input is high. (d) the single input is low. 6. What is the decimal equivalent of binary 1111 (a) 15 (b) 31 (c) 63 (d) 127 7. The output of an AND gate is high if and only if (a) one input is high and the others are low. (b) one input is low and the others are high. (c) any of the inputs is low. (d) all inputs are high. 8. DeMorgan s Theorem states that, for all logical statements X and Y, (a) (X*Y) is equivalent to X+Y. (b) X*Y is equivalent to (X+Y). (c) ( X)+( Y) is equivalent to X*Y. (d) ( X)+( Y) is equivalent to (X*Y). 9. If you see a number represented by FF in the documentation for an electronic circuit or system, you can be certain that the number is (a) radix 16. (b) radix 10. (c) radix 8. (d) radix 2. 10. Which of the following codes is digital (a) Morse (b) Baudot (c) ASCII (d) All of the above 11. Which of the following voltages could normally represent a 1 in positive logic (a) 0.0 V (b) +0.5 V (c) +5 V (d) +50 V 12. Which of the following voltages might normally represent a 1 in negative logic (a) 0.0 V (b) +12 V
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(c) +5 V (d) +50 V 13. Fill in the blank to make the following sentence true: bits sent along a single line, one bit after another. (a) Serial (b) Synchronous (c) Parallel (d) Analog 14. The inputs of an R-S flip-flop are known as (a) low and high. (b) octal and binary. (c) synchronous and asynchronous. (d) reset and set. 15. When both inputs of an R-S flip-flop are 0, (a) the outputs stay as they are. (b) Q = 0 and Q = 1. (c) Q = 1 and Q = 0. (d) the resulting outputs can be absurd. 16. The fifth digit from the right in a binary number carries which decimal value (a) 64 (b) 32 (c) 24 (d) 16 17. What is the octal equivalent of binary 1010 (a) 4 (b) 10 (c) 12 (d) There is no way to tell without more information. 18. What is the largest possible radix 10 number that can be represented as a six-digit binary number (a) Decimal 256 (b) Decimal 128 (c) Decimal 64 (d) Decimal 63 19. If one of the inputs to a two-input NOR gate is high, what is the output state (a) There is not enough information to tell. (b) Low data transmission refers to digital
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(c) High (d) It depends on the state of the other input. 20. Suppose a logic circuit has four inputs W, X, Y, and Z. How many possible input combinations are there (a) 4 (b) 8 (c) 16 (d) 32
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DO NOT REFER TO THE TEXT WHEN TAKING THIS TEST. A GOOD SCORE IS AT LEAST 37 CORRECT. Answers are in the back of the book. It s best to have a friend check your score the first time, so you won t memorize the answers if you want to take the test again.
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1. In a JFET, the control electrode is usually the (a) source. (b) emitter. (c) drain. (d) base. (e) gate. 2. A diode can be used as a frequency multiplier because of its (a) junction capacitance. (b) nonlinearity. (c) avalanche voltage. (d) forward breakover. (e) charge carrier concentration. 3. Which of the following is not a common form of data transmission (a) Polarization modulation (b) Frequency modulation (c) Amplitude modulation (d) Phase modulation (e) Pulse modulation 4. A very brief, high-voltage spike on an ac power line is called (a) a bleeder. (b) an arc.
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