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FEexam > Digital Systems > Flashcards

Digital Systems Flashcards

1
Q

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

A

Correct Option: B

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2
Q

How many select lines are required for a 1-16 demultiplexer?

A. 2

B. 3

C. 4

D. 5

A

Correct Option: C

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3
Q

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

A

Correct Option: A

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4
Q

A latch is:

A. Level sensitive

B. Edge sensitive

C. Neither level sensitive nor edge sensitive

D. Both level sensitive and edge sensitive

A

Correct Option: A

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5
Q

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

A

C. (976.CA)16

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6
Q

Convert the binary number 110110 to hexadecimal.

A. 36

B. 54

C. 66

D. 3F

A

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.

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7
Q

The 2’s complement of 11011000 is:

A. 00100111.

B. 00101000.

C. 11011010.

D. 00101010.

A

Correct Option: B

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8
Q

The 2’s complement representation of -5 subscript 10 is:

A. 0101

B. 1010

C. 1011

D. 1001

A

Correct Option: C

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9
Q

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

A

Correct Option: D

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10
Q

Two’s complement of the binary number 10100 is:

A. 10100.

B. 10101

C. 01011

D. 01100.

A

Correct Option: D

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11
Q

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

A

Correct Option: B

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12
Q

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

A

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.

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13
Q

Convert hexa decimal base-16 digit 16 to decimal base 10

A. 16

B. 22

C. 8

D. 24

A

Correct Option: B

Refer to “Number systems & Codes” in the NCEES FE Reference Handbook> Electrical and Computer Engineering> Number Systems and Codes

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14
Q

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

A

Correct Option: D

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15
Q

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

A

Correct Option: A

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16
Q

Convert 1001011 to decimal.

A. 20

B. 50

C. 75

D. 100.1011

A

Correct Option: C

17
Q

Convert 286 base 10 to base 8.

A. 35.75

B. 436

C. 634

D. 2,288

A

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)

18
Q

Push and pop instruction formal is used for:

A. RISC architecture
C. CISC architecture
B. Von-Neuman architecture
D. stack-organized

A

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

19
Q

What is the main in which a JK flip-flop differs from an RS flip-flop

A

A JK flip-flip allows both input a 1 and RS does not

20
Q

A quad gate contains _______ logic gates

A. 4
B. 2
C. 8
D. 6

A

A. 4

21
Q

What is the equivalent in hexadecimal for the decimal number 973?

A. 4BC
B. 4CD
C. CB4
D. 3CD

A

D. 3CD

22
Q

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

A

D. indeterminate

23
Q

What is the ASCII code for letter A?

A. 1100011
B. 1000001
C. 1111111
D. 10011

A

B. 1000001

24
Q

What does the stack overflow cause?

A. Hardware interrupt
B. External interrupt
C. Internal interrupt
D. Software interrupt

A

C. Internal interrupt

25
Q

Dynamic RAM consumes ________ power and is ________ than the static RAM.

A. more, faster
B. more, slower
C. less, slower
D. less, faster

A

C. less, slower

26
Q

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

A

C. JK flip-flop

27
Q

What is a flip-flop?

A. 2-bit memory
B. 1-bit memory
C. Four state device
D. Nothing to do with memory

A

B. 1-bit memory

28
Q

What is MSD in the decimal number system?

A

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

29
Q

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

A

B. Multi-programing

30
Q

What is the application of a flip-flop?

A. Counters
B. Shift registers
C. transfer registers
D. All of the above

A

B. Multi-programing

31
Q

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

A

D. All the above

32
Q

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

A. 15 ns

33
Q

What is the circuit which converts binary data into decimals?

A. Encoder
B. Multiplexer
C. Decoder
D. Code converter

A

D. Code converter

34
Q

Which one of the following logic circuits is used for addressing memory?

A. Full adder
B. Multiplexer
C. Decoder
D. Direct memory access circuit

A

C. Decoder

35
Q

A logic X-OR operation of (4ACOH)H & (B53F)H results in ______

A. AACB
B. 0
C. FFFF
D. ABCD

A

C. FFFF

36
Q

What are the building blocks of combination circuits?

A. Flip- Flops
B. Logical gates
C. Registers
D. Decoders

A

B. Logical gates

37
Q

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

A

B. Assembler

FEexam (10 decks)

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