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- Question
A flip-flop is in the CLEAR condition when
.
Options- A. True
- B. False
- Correct Answer
- False
- 1. If both inputs of an S-R flip-flop are low, what will happen when the clock goes HIGH?
Options- A. An invalid state will exist.
- B. No change will occur in the output.
- C. The output will toggle.
- D. The output will reset. Discuss
- 2. The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:
Options- A. adding a fixed voltage-divider bias resistive network at the output of the TTL device
- B. avoiding this condition and only using TTL to drive TTL
- C. adding an external pull-down resistor to ground
- D. adding an external pull-up resistor to VCC Discuss
- 3. A decoder can be used as a demultiplexer by ________.
Options- A. tying all enable pins LOW
- B. tying all data-select lines LOW
- C. tying all data-select lines HIGH
- D. using the input lines for data selection and an enable line for data input Discuss
- 4. What is the purpose of a decoder's inputs?
Options- A. To allow the decoder to respond to the inputs to activate the correct output gate.
- B. To disable the decoder outputs so that all outputs will be inactive.
- C. To disable the inputs and activate all outputs.
- D. To allow the decoder to respond to the inputs to activate the correct output gate, and to disable the inputs and activate all outputs. Discuss
- 5. A principle regarding most IC decoders is that when the correct input is present, the related output will switch:
Options- A. active-HIGH
- B. to a high impedance
- C. to an open
- D. active-LOW Discuss
- 6. An output gate is connected to four input gates; the circuit does not function. Preliminary tests with the DMM indicate that the power is applied; scope tests show that the primary input gate has a pulsing signal, while the interconnecting node has no signal. The four load gates are all on different ICs. Which instrument will best help isolate the problem?
Options- A. Current tracer
- B. Logic probe
- C. Oscilloscope
- D. Logic analyzer Discuss
- 7. Two 4-bit binary numbers (1011 and 1111) are applied to a 4-bit parallel adder. The carry input is 1. What are the values for the sum and carry output?
Options- A. ∑4∑3∑2∑1 = 0111, Cout = 0
- B. ∑4∑3∑2∑1 = 1111, Cout = 1
- C. ∑4∑3∑2∑1 = 1011, Cout = 1
- D. ∑4∑3∑2∑1 = 1100, Cout = 1 Discuss
- 8. Looping on a K-map always results in the elimination of:
Options- A. variables within the loop that appear only in their complemented form.
- B. variables that remain unchanged within the loop.
- C. variables within the loop that appear in both complemented and uncomplemented form.
- D. variables within the loop that appear only in their uncomplemented form. Discuss
- 9. What type of logic circuit is represented by the figure shown below?
Options- A. XOR
- B. XNOR
- C. XAND
- D. XNAND Discuss
- 10. The principal advantage of MOS ICs over TTL ICs is their fast operating speed.
Options- A. True
- B. False Discuss
More questions
Correct Answer: No change will occur in the output.
Correct Answer: adding an external pull-up resistor to VCC
Correct Answer: using the input lines for data selection and an enable line for data input
Correct Answer: To allow the decoder to respond to the inputs to activate the correct output gate, and to disable the inputs and activate all outputs.
Correct Answer: active-LOW
Correct Answer: Current tracer
Correct Answer: ∑4∑3∑2∑1 = 1011, Cout = 1
Correct Answer: variables within the loop that appear in both complemented and uncomplemented form.
Correct Answer: XNOR
Correct Answer: False
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