Digital Systems Flashcards
Why is a demultiplexer called a data distributor?
A. Single input gives single output
B. Single input gives multiple output
C. Output will be distributed to one input
D. One input will be selected for output
Correct Option: B
How many select lines are required for a 1-16 demultiplexer?
A. 2
B. 3
C. 4
D. 5
Correct Option: C
What is the maximum frequency at which a logic gate will operate? Assume the following parameters: td = 10 ms, tr= 15 ms, ts=20 ms, tf= 25 ms.
A. 14.28 Hz
B. 8.5 Hz
C. 12.3 Hz
D. 15 Hz
Correct Option: A
A latch is:
A. Level sensitive
B. Edge sensitive
C. Neither level sensitive nor edge sensitive
D. Both level sensitive and edge sensitive
Correct Option: A
10) Question ID:1516009 Convert 100101110110.11001010 to hexadecimal. The given value is in binary.
A. (B36.CB)–>16 (base 16)
B. (9F4.EB)16
C. (976.CA)16
D. (9A5.15)16
C. (976.CA)16
Convert the binary number 110110 to hexadecimal.
A. 36
B. 54
C. 66
D. 3F
Correct Option: A
Convert to decimal using the equation found in the NCEES FE Reference Handbook>Electrical and Computer Engineering> Number Systems and Codes 8 under Binary Number System.
The 2’s complement of 11011000 is:
A. 00100111.
B. 00101000.
C. 11011010.
D. 00101010.
Correct Option: B
The 2’s complement representation of -5 subscript 10 is:
A. 0101
B. 1010
C. 1011
D. 1001
Correct Option: C
A 4-bit binary counter is implemented with four flip flops. What is the maximum possible range of this counter?
A. 1 to 12
B. 0 to 4
C. 1 to 4
D. 0 to 15
Correct Option: D
Two’s complement of the binary number 10100 is:
A. 10100.
B. 10101
C. 01011
D. 01100.
Correct Option: D
The input state of a D-flip flop is 1. After the clock signal is applied, the output state of the flip flop is:
A. 0.
B. 1.
C. Neither
D. Both
Correct Option: B
What is the prime implicant of the following function?
straight M = AB + BA +A +B
A. A
B. AB, BA, A, B
C. A, B
D. B
Correct Option: C
Refer to “Logic Operations and Boolean Algebra” in the NCEES FE Reference Handbook> Electrical and Computer Engineering> Logic Operations and Boolean Algebra
The function is true if any of the terms are true.
Convert hexa decimal base-16 digit 16 to decimal base 10
A. 16
B. 22
C. 8
D. 24
Correct Option: B
Refer to “Number systems & Codes” in the NCEES FE Reference Handbook> Electrical and Computer Engineering> Number Systems and Codes
Your television’s manufacturer needs to determine volume levels of your TV. The voltage range of the TV is 1V and 10V with an 8-bit resolution. Determine voltage resolution given VH and VL and bit resolution.
A. 0.0254 volts
B. 0.0586 volts
C. 0.043 volts
D. 0.0352 volts
Correct Option: D
The least significant bit of your digital system has a voltage of approximately 3 volts. What is the maximum quantization error of the digital system for digital-to-analog conversion?
A. 1.5 volts
B. 6 volts
C. 0.5 volts
D. 1 volt
Correct Option: A
Convert 1001011 to decimal.
A. 20
B. 50
C. 75
D. 100.1011
Correct Option: C
Convert 286 base 10 to base 8.
A. 35.75
B. 436
C. 634
D. 2,288
Determine the highest order of 8 that is less than 286.
Divide 286 by that order of 8. The first digit is the result (without the remainder).
286/8^2 = 4 R30
Divide the remainder by the next smallest order of 8. The second digit is the result (without the remainder).
30/8^1 = 3 R6
Divide the remainder by the next smallest order of 8. Continue this process until the denominator is 80 to obtain the final answer.
6 / 8^0 = 6 R0
Final answer = 436 (B)
Push and pop instruction formal is used for:
A. RISC architecture
C. CISC architecture
B. Von-Neuman architecture
D. stack-organized
D. stack-organized
In a stack-organized architecture, push and pop instruction is needed for an address field to specify the location of data for pushing into the stack and destination location during pop operation
What is the main in which a JK flip-flop differs from an RS flip-flop
A JK flip-flip allows both input a 1 and RS does not
A quad gate contains _______ logic gates
A. 4
B. 2
C. 8
D. 6
A. 4
What is the equivalent in hexadecimal for the decimal number 973?
A. 4BC
B. 4CD
C. CB4
D. 3CD
D. 3CD
For SR flip-flop when S= 1 and R = 1 then Q is
___________
A. No change
B. clear to 0
C set to 1
D. indeterminate
D. indeterminate
What is the ASCII code for letter A?
A. 1100011
B. 1000001
C. 1111111
D. 10011
B. 1000001
What does the stack overflow cause?
A. Hardware interrupt
B. External interrupt
C. Internal interrupt
D. Software interrupt
C. Internal interrupt
Dynamic RAM consumes ________ power and is ________ than the static RAM.
A. more, faster
B. more, slower
C. less, slower
D. less, faster
C. less, slower
Which of the following flip-flop output types is clearly defined for all combination of two inputs?
A. Q type flip-flop
B. RS type flip-flop
C. JK flip-flop
D. T flip-flop
C. JK flip-flop
What is a flip-flop?
A. 2-bit memory
B. 1-bit memory
C. Four state device
D. Nothing to do with memory
B. 1-bit memory
What is MSD in the decimal number system?
The MSD is a stream of numbers’ middle digit.
Explanation: The middle digit of a stream of numbers is MSD in the decimal numbering system
What is a that name of a system that can process two or more programs?
A. Multi-tasking
B. Multi-programing
C. Multi-threading
D. Multi-inheritance
B. Multi-programing
What is the application of a flip-flop?
A. Counters
B. Shift registers
C. transfer registers
D. All of the above
B. Multi-programing
Which of the following modes is used to handle data transfer to and from peripherals?
A. Programed I/O
B. Interrupted - initiated I/O
C. Direct memory access
D. All the above
D. All the above
A 4-bit synchronous counter uses flip-flops with propagation delay times of 15 ns each. The maximum possible time required for change of state will be:
A. 15 ns
B. 30 ns
C. 45 ns
D. 60 ns
A. 15 ns
What is the circuit which converts binary data into decimals?
A. Encoder
B. Multiplexer
C. Decoder
D. Code converter
D. Code converter
Which one of the following logic circuits is used for addressing memory?
A. Full adder
B. Multiplexer
C. Decoder
D. Direct memory access circuit
C. Decoder
A logic X-OR operation of (4ACOH)H & (B53F)H results in ______
A. AACB
B. 0
C. FFFF
D. ABCD
C. FFFF
What are the building blocks of combination circuits?
A. Flip- Flops
B. Logical gates
C. Registers
D. Decoders
B. Logical gates
Which of the following is used to generate address symbol table?
A. Memory management software
B. Assembler
C. Match logic of associative memory
D. Generated by operating system
B. Assembler
