Counters problems
- 1. A 22-MHz clock signal is put into a MOD-16 counter. What is the frequency of the Q output of each stage of the counter?
Options- A. Q1 = 22 MHz, Q2 = 11 MHz, Q3 = 5.5 MHz, Q4 = 2.75 MHz
- B. Q1 = 11 MHz, Q2 = 5.5 MHz, Q3 = 2.75 MHz, Q4 = 1.375 MHz
- C. Q1 = 11 MHz, Q2 = 11 MHz, Q3 = 11 MHz, Q4 = 11 MHz
- D. Q1 = 22 MHz, Q2 = 22 MHz, Q3 = 22 MHz, Q4 = 22 MHz Discuss
Correct Answer: Q1 = 11 MHz, Q2 = 5.5 MHz, Q3 = 2.75 MHz, Q4 = 1.375 MHz
- 2. The final output of a modulus-8 counter occurs one time for every ________.
Options- A. 8 clock pulses
- B. 16 clock pulses
- C. 24 clock pulses
- D. 32 clock pulses Discuss
Correct Answer: 8 clock pulses
- 3. How many AND gates would be required to completely decode ALL the states of a MOD-64 counter, and how many inputs must each AND gate have?
Options- A. 128 gates, 6 inputs to each gate
- B. 64 gates, 5 inputs to each gate
- C. 64 gates, 6 inputs to each gate
- D. 128 gates, 5 inputs to each gate Discuss
Correct Answer: 64 gates, 6 inputs to each gate
- 4. A 4-bit counter has a maximum modulus of ________.
Options- A. 3
- B. 6
- C. 8
- D. 16 Discuss
Correct Answer: 16
- 5. How many data bits can be stored in the register shown below?
Options- A. 5
- B. 32
- C. 31
- D. 4 Discuss
Correct Answer: 5
- 6. A seven-segment, common-anode LED display is designed for:
Options- A. all cathodes to be wired together
- B. one common LED
- C. a HIGH to turn off each segment
- D. disorientation of segment modules Discuss
Correct Answer: a HIGH to turn off each segment
- 7. An asynchronous 4-bit binary down counter changes from count 2 to count 3. How many transitional states are required?
Options- A. None
- B. One
- C. Two
- D. Fifteen Discuss
Correct Answer: Fifteen
- 8. Synchronous counters eliminate the delay problems encountered with asynchronous counters because the:
Options- A. input clock pulses are applied only to the first and last stages
- B. input clock pulses are applied only to the last stage
- C. input clock pulses are not used to activate any of the counter stages
- D. input clock pulses are applied simultaneously to each stage Discuss
Correct Answer: input clock pulses are applied simultaneously to each stage
- 9. In an HDL ring counter, many invalid states are included in the programming by:
Options- A. using a case statement.
- B. using an elsif statement.
- C. including them under others.
- D. the ser_in line. Discuss
Correct Answer: including them under others.
- 10. List which pins need to be connected together on a 7493 to make a MOD-12 counter.
Options- A. 12 to 1, 11 to 3, 9 to 2
- B. 12 to 1, 11 to 3, 12 to 2
- C. 12 to 1, 11 to 3, 8 to 2
- D. 12 to 1, 11 to 3, 1 to 2 Discuss
Correct Answer: 12 to 1, 11 to 3, 8 to 2
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