3-E-035: Logic Levels
3-35E1:
In a negative-logic circuit, what level is used to represent a logic 0?
High level.
Low level.
Positive-transition level.
Negative-transition level.
3-35E2:
For the logic input levels shown in Figure 3E12, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.)
A is low, B is high and C is high.
A is high, B is low and C is low.
A is high, B is high and C is low.
A is low, B is high and C is low.
3-35E3:
For the logic input levels given in Figure 3E13, what are the logic levels of test points A, B and C in this circuit? (Assume positive logic.)
A is high, B is high and C is high.
A is low, B is low and C is high.
A is low, B is high and C is low.
A is high, B is low and C is low.
3-35E4:
In a positive-logic circuit, what level is used to represent a logic 1?
High level
Low level
Positive-transition level
Negative-transition level
3-35E5:
Given the input levels shown in Figure 3E14 and assuming positive logic devices, what would the output be?
A is low, B is high and C is high.
A is high, B is high and C is low.
A is low, B is low and C is high.
None of the above are correct.
3-35E6:
What is a truth table?
A list of input combinations and their corresponding outputs that characterizes a digital device’s function.
A table of logic symbols that indicate the high logic states of an op-amp.
A diagram showing logic states when the digital device’s output is true.
A table of logic symbols that indicates the low logic states of an op-amp.
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