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Combinational Logic Circuits
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Question
How many outputs would two 8-line-to-3-line encoders, expanded to a 16-line-to-4-line encoder, have?
Options
A. 3
B. 4
C. 5
D. 6
Correct Answer
4
Tags:
Bank Exams
More questions
1. A push-button switch is used to input data to a register. The output of the register is erratic. What could be causing the problem?
Options
A. The power supply is probably noisy.
B. The switch contacts are bouncing.
C. The socket contacts on the register IC are corroded.
D. The register IC is intermittent and failure is imminent.
Show Answer
Scratch Pad
Discuss
Correct Answer: The switch contacts are bouncing.
2. The power dissipation of a CMOS IC will ________.
Options
A. decrease with frequency
B. increase with gate size
C. decrease with gate size
D. increase with frequency
Show Answer
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Discuss
Correct Answer: increase with frequency
3. Which of the following is not a weighted value positional numbering system:
Options
A. hexadecimal
B. binary-coded decimal
C. binary
D. octal
Show Answer
Scratch Pad
Discuss
Correct Answer: binary-coded decimal
4. ________ ADCs have a fixed value of conversion time that is not dependent on the value of the analog input.
Options
A. Substandard
B. Dual
C. Recessive-approximation
D. Successive-approximation
Show Answer
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Discuss
Correct Answer: Successive-approximation
5. A correct output is achieved from a master-slave
J-K
flip-flop only if its inputs are stable while the:
Options
A. clock is LOW
B. slave is transferring
C. flip-flop is reset
D. clock is HIGH
Show Answer
Scratch Pad
Discuss
Correct Answer: clock is HIGH
6. In VHDL, macrofunctions is/are:
Options
A. digital circuits.
B. analog circuits.
C. a set of bit vectors.
D. preprogrammed TTL devices.
Show Answer
Scratch Pad
Discuss
Correct Answer: preprogrammed TTL devices.
7. A J-K flip-flop is in a "no change" condition when ________.
Options
A. J = 1, K = 1
B. J = 1, K = 0
C. J = 0, K = 1
D. J = 0, K = 0
Show Answer
Scratch Pad
Discuss
Correct Answer: J = 0, K = 0
8. PMOS and NMOS circuits are used largely in ________.
Options
A. MSI functions
B. LSI functions
C. diode functions
D. TTL functions
Show Answer
Scratch Pad
Discuss
Correct Answer: LSI functions
9. ________ counters are often used whenever pulses are to be counted and the results displayed in decimal.
Options
A. Synchronous
B. Bean
C. Decade
D. BCD
Show Answer
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Discuss
Correct Answer: BCD
10. Assume that in a certain 4-bit weighted ladder DAC, the input representing the most significant bit is applied to a 20 kΩ resistor. What is the size of the resistor that represents the least significant bit?
Options
A. 2.5 kΩ
B. 5 kΩ
C. 80 kΩ
D. 160 kΩ
Show Answer
Scratch Pad
Discuss
Correct Answer: 160 kΩ
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