1). The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.
View AnswerANS: C - A = 1, B = 1, C = 1
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2). If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
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3). If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a(n):
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4). A device used to display one or more digital signals so that they can be compared to expected timing diagrams for the signals is a:
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5). When used with an IC, what does the term "QUAD" indicate?
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6). The output of an OR gate with three inputs, A, B, and C, is LOW when ________.
View AnswerANS: A - A = 0, B = 0, C = 0
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7). Which of the following logical operations is represented by the + sign in Boolean algebra?
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8). Output will be a LOW for any case when one or more inputs are zero for a(n):
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9). How many pins does the 4049 IC have?
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10). Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits?
View AnswerANS: A - basic gates, a clock oscillator, and a repetitive waveform generator
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11). TTL operates from a ________.
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12). The output of a NOR gate is HIGH if ________.
View AnswerANS: D - all inputs are LOW
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13). The switching speed of CMOS is now ________.
View AnswerANS: A - competitive with TTL
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14). The format used to present the logic output for the various combinations of logic inputs to a gate is called a(n):
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15). The power dissipation, PD , of a logic gate is the product of the ________.
View AnswerANS: B - dc supply voltage and the average supply current
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16). A logic probe is again applied to the pins of a 7421 IC with the following results. Is there a problem with the circuit and if so, what is the problem?
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17). If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
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18). The Boolean expression for a 3-input AND gate is ________.
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19). A CMOS IC operating from a 3-volt supply will consume ________.
View AnswerANS: A - less power than a TTL IC
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20). What does the small bubble on the output of the NAND gate logic symbol mean?
View AnswerANS: C - The output is inverted.
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21). What are the pin numbers of the outputs of the gates in a 7432 IC?
A 3, 6, 10, and 13
B 1, 4, 10, and 13
C 3, 6, 8, and 11
D 1, 4, 8, and 11
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22). The output of a NOT gate is HIGH when ________.
View AnswerANS: A - the input is LOW
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23). If the input to a NOT gate is A and the output is X, then ________.
View AnswerANS: B -
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24). A logic probe is used to test the pins of a 7411 IC with the following results. Is there a problem with the chip and if so, what is the problem?
View AnswerANS: B - Pin 6 should be pulsing.
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25). How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?
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26). If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be? View AnswerANS: C - At least one input must be LOW.
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27). Logically, the output of a NOR gate would have the same Boolean expression as a(n):
View AnswerANS: B - OR gate immediately followed by an inverter
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28). A logic probe is placed on the output of a gate and the display indicator is dim. A pulser is used on each of the input terminals, but the output indication does not change. What is wrong?
View AnswerANS: B - The output of the gate appears to be open.
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29). What is the Boolean expression for a three-input AND gate?
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30). Which of the following gates has the exact inverse output of the OR gate for all possible input combinations?
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31). What is the difference between a 7400 and a 7411 IC?
View AnswerANS: B - 7400 has four two-input NAND gates; 7411 has three three-input AND gates
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32). Write the Boolean expression for an inverter logic gate with input C and output Y .
View AnswerANS: B - Y =
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33). The output of an exclusive-OR gate is HIGH if ________.
View AnswerANS: C - the inputs are unequal
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34). A clock signal with a period of 1 s is applied to the input of an enable gate. The output must contain six pulses. How long must the enable pulse be active?
View AnswerANS: C - Enable must be active for 6 s.
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35). The AND function can be used to ________ and the OR function can be used to ________ .
View AnswerANS: C - enable or disable, enable or disable
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36). One advantage TTL has over CMOS is that TTL is ________. View AnswerANS: B - not sensitive to electrostatic discharge
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37). A 2-input NOR gate is equivalent to a ________.
View AnswerANS: B - negative-AND gate
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38). If a 3-input OR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?
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39). Fan-out is specified in terms of ________.
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40). How many input combinations would a truth table have for a six-input AND gate?
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41). What is the circuit number of the IC that contains four two-input AND gates in standard TTL?
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42). The terms "low speed" and "high speed," applied to logic circuits, refer to the ________.
View AnswerANS: C - propagation delay time
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43). The NOR logic gate is the same as the operation of the ________ gate with an inverter connected to the output.
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44). The logic expression for a NOR gate is ________.
View AnswerANS: D -
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45). With regard to an AND gate, which statement is true?
View AnswerANS: C - If one input to a 2-input AND gate is HIGH, the output reflects the other input.
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46). The term "hex inverter" refers to:
View AnswerANS: B - six inverters in a single package
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47). How many inputs are on the logic gates of a 74HC21 IC?
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48). The basic logic gate whose output is the complement of the input is the:
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49). When reading a Boolean expression, what does the word "NOT" indicate?
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50). The output of an exclusive-NOR gate is HIGH if ________.
View AnswerANS: A - the inputs are equal
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51). How many AND gates are found in a 7411 IC?
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52). Which of the following equations would accurately describe a four-input OR gate when A = 1, B = 1, C = 0, and D = 0?
View AnswerANS: B - 1 + 1 + 0 + 0 = 1
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53). What is the name of a digital circuit that produces several repetitive digital waveforms?
View AnswerANS: C - a Johnson shift counter
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54). The basic types of programmable arrays are made up of ________.
View AnswerANS: D - AND gates and OR gates
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55). The logic gate that will have HIGH or "1" at its output when any one (or more) of its inputs is HIGH is a(n):
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56). CMOS IC packages are available in ________.
View AnswerANS: C - DIP and SOIC configurations
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57). Which of the following is not a basic Boolean operation?
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58). Which of the following gates is described by the expression ?
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59). What is the Boolean expression for a four-input OR gate? View AnswerANS: A - Y = A + B + C + D
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60). How many truth table entries are necessary for a four-input circuit?
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61). How many entries would a truth table for a four-input NAND gate have?
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62). The Boolean expression for a 3-input OR gate is ________.
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63). From the truth table for a three-input NOR gate, what is the only condition of inputs A , B , and C that will make the output X high?
View AnswerANS: D - A = 0, B = 0, C = 0
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64). The logic gate that will have a LOW output when any one of its inputs is HIGH is the:
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65). The output of a NAND gate is LOW if ________.
View AnswerANS: B - all inputs are HIGH
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