MSI Logic Circuits Questions and Answers

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Showing 10 of 38 questions
Q11
Why are control inputs included in an HDL magnitude comparator?
  • A For cascading the chips
  • B For control signal input
  • C For signal control
  • D For internal interconnections
Answer: Option A
Q12
What VHDL techniques are used to describe a priority encoder?
  • A Integer outputs and priority coding
  • B Signal outputs and priority coding
  • C Tristate outputs and priority coding
  • D Variables and priority coding
Answer: Option C
Q13
What is an important attribute of the conditional signal assignment statement?
  • A Its tristate outputs
  • B Its sequential evaluation
  • C Its use of library components
  • D Its fast activation times
Answer: Option B
Q14
There appears to be a problem with a 7-segment display on a DMM sometimes skipping certain numbers. How would you test the display?
  • A Remove the display unit and check each segment diode with an ohmmeter. Replace the defective segments.
  • B Apply 5 V directly to each segment of the display and check for individual segment operation. Replace any segment that has voltage applied but is not lit.
  • C Tie all of the segments together and connect to Vcc; the number 8 should appear on the display. Now check the display supply voltage to determine if the display is receiving the correct voltage.
  • D Connect the DMM to a variable supply and very slowly increase the voltage, while observing for missing digits. Then check the segment voltage to determine whether the display or the display driver is bad.
Answer: Option D
Q15
What is the purpose of a decoder's inputs?
  • 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.
Answer: Option D
Q16
The circuit in Figure 9-8 is defective; data is not appearing on the output lines. A check with the scope shows data pulses on the serial data line and multiplex control lines, S0–S2; no parity error is indicated. A further check with a logic probe indicates that Vcc and ground appear to be present. What might be wrong with the circuit?
  • A The demultiplexer may be bad.
  • B The parity checker is defective.
  • C The parity generator may be bad.
  • D The parity checker is defective, or the parity generator may be bad.
Answer: Option A
Q17
A device that selects one of several inputs to be placed on the output is a multiplexer.
  • A TRUE
  • B FALSE
Answer: Option A
Q18
A device that selects one of several inputs to be placed on the output is a multiplexer.
  • A TRUE
  • B FALSE
Answer: Option A
Q19
A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.
  • A TRUE
  • B FALSE
Answer: Option A
Q20
When data input I1 of a 74148 octal-to-binary encoder is active, the data output is: A0 = 0 A1 = 0 A2 = 1
  • A TRUE
  • B FALSE
Answer: Option B

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