Q.1

If [A] = 1011 1010, [B] = 0011 0110, and [C] = [A] • [B], what is [C 4..2] in decimal?

  • 1
  • 2
  • 3
  • 4
Q.2

A half-adder circuit would normally be used each time a carry input is required in an added circuit.

  • True
  • False
Q.3

Which of the following is correct for full adders?

  • Full adders have the capability of directly adding decimal numbers.
  • Full adders are used to make half adders.
  • Full adders are limited to two inputs since there are only two binary digits.
  • In a parallel full adder, the first stage may be a half adder.
Q.4

This logic gate is used to produce an arithmetic sum XOR.

  • True
  • False
Q.5

The solution to the binary problem 0101 + 1111 is 10100.

  • True
  • False
Q.6

The carry-out of a binary adder is identified using the summation symbol, sigma.

  • True
  • False
Q.7

Using 4-bit adders to create a 1See Section 6-bit adder:

  • requires 16 adders.
  • requires 4 adders.
  • requires the carry-out of the less significant adder to be connected to the carry-in of the next significant adder.
  • requires 4 adders and the connection of the carry out of the less significant adder to the carry-in of the next significant adder.
Q.8

When performing subtraction by addition in the 2's-complement system:

  • the minuend and the subtrahend are both changed to the 2's-complement.
  • the minuend is changed to 2's-complement and the subtrahend is left in its original form.
  • the minuend is left in its original form and the subtrahend is changed to its 2's-complement.
  • the minuend and subtrahend are both left in their original form.
Q.9

If B[7..0] = 10100101, what is the value of B[6..2]?

  • 10100
  • 01001
  • 10010
  • 00101
Q.10

The most commonly used system for representing signed binary numbers is the:

  • 2's-complement system.
  • 1's-complement system.
  • 10's-complement system.
  • sign-magnitude system.
Q.11

Convert each of the signed decimal numbers to an 8-bit signed binary number (two's-complement).
+7        –3        –12

  • 0000  0111    1111  1101    1111  0100
  • 1000  0111    0111  1101    0111  0100
  • 0000  0111    0000  0011    0000  1100
  • 0000  0111    1000  0011    1000  1100
Q.12

What is one disadvantage of the ripple-carry adder?

  • The interconnections are more complex.
  • More stages are required to a full adder.
  • It is slow due to propagation time.
  • All of the above.
Q.13

Could the sum output of a full-adder be used as a two-bit parity generator?

  • Yes
  • No
Q.14

Why is a fast-look-ahead carry circuit used in the 7483 4-bit full-adder?

  • to decrease the cost
  • to make it smaller
  • to slow down the circuit
  • to speed up the circuit
Q.15

Convert each of the decimal numbers to two's-complement form and perform the addition in binary.

+13&nbsp–10
add –7&nbspadd +15
  • 0001  0100    0000  0101
  • 0000  0110    0001  1001
  • 0000  0110    0000  0101
  • 1111  0110    1111  0101
Q.16

Subtract the following hexadecimal numbers.

47 &nbsp 34 &nbsp FA
–25 &nbsp –1C &nbsp –2F
  • 22    18    CB
  • 22    17    CB
  • 22    19    CB
  • 22    18    CC
Q.17

Convert the decimal numbers 275 and 965 to binary-coded decimal (BCD) and add. Select the BCD code groups that reflect the final answer.

  • 1101 1110 1010
  • 1110 1010 1110
  • 0001 0010 0100 0000
  • 0010 0011 0100 0000
Q.18

ALU circuits cannot be cascaded to perform functions on more than four bits.

  • True
  • False
Q.19

Solve this binary problem: 01110010 – 01001000 =

  • 00011010
  • 00101010
  • 01110010
  • 00111100
Q.20

One way to make a four-bit adder perform subtraction is by:

  • inverting the output.
  • inverting the carry-in.
  • inverting the B inputs.
  • grounding the B inputs.
Q.21

The 74LS382 ALU is a 24-pin arithmetic/logic unit.

  • True
  • False
Q.22

The two's-complement system is to be used to add the signed numbers 11110010 andDetermine, in decimal, the sign and value of each number and their sum.

  • –14 and –13, –27
  • –113 and –114, 227
  • –27 and –13, 40
  • –11 and –16, –27
Q.23

How many inputs must a full-adder have?

  • 4
  • 2
  • 5
  • 3
Q.24

What is the major difference between half-adders and full-adders?

  • Nothing basically; full-adders are made up of two half-adders.
  • Full adders can handle double-digit numbers.
  • Full adders have a carry input capability.
  • Half adders can handle only single-digit numbers.
Q.25

Solve this binary problem: 01000110 ÷ 00001010 =

  • 0111
  • 10011
  • 1001
  • 0011
Q.26

In VHDL, what is a GENERATE statement?

  • The start statement of a program
  • Not used in VHDL or ADHL
  • A way to get the computer to generate a program from a circuit diagram
  • A way to tell the compiler to replicate several components
Q.27

Find the 2's complement of –1101102.

  • 1101002
  • 1010102
  • 0010012
  • 0010102
Q.28

Add the following binary numbers.

0010 0110 &nbsp 0011 1011 &nbsp 0011 1100
+0101 0101 &nbsp +0001 1110 &nbsp +0001 1111
  • 0111 1011    0100  0001    0101  1011
  • 0111 1011    0101  1001    0101  1011
  • 0111 0111    0101  1001    0101  1011
  • 0111 0111    0100  0001    0101  1011
Q.29

When multiplying 13 × 11 in binary, what is the third partial product?

  • 1011
  • 00000000
  • 100000
  • 100001
Q.30

What distinguishes the look-ahead-carry adder?

  • It is slower than the ripple-carry adder.
  • It is easier to implement logically than a full adder.
  • It is faster than a ripple-carry adder.
  • It requires advance knowledge of the final answer.
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