In this technique, there is a link between subscriber and network and a local loop.

- TSDL
**ASDL**Correct- SSDL
- DSDL

What does the symbol D represent in a hexadecimal number system?

**13**Correct- 14
- 8
- 16

(1217)8 is equivalent to

- (2297)10
- (1217)16
**(028F)16**Correct- (0B17)16

>> operator is used to denote _________

- less than
- left shift
**right shift**Correct- greater than

2’s complement is obtained by adding 1 to 1’s complement of a number.

**True**Correct- False

3 bits full adder contains ________

**8 combinational inputs**Correct- 4 combinational inputs
- 6 combinational inputs
- 3 combinational inputs

7’s complement of 432 is _________________

- 777
**345**Correct- 543
- 432

A ____________ is a circuit with only one output but can have multiple inputs.

- Truth table
- Boolean circuit
- Binary circuit
**Logic gate**Correct

A bit in a computer terminology means either 0 or 1.

**True**Correct- False

A computer language that is written in binary codes only is _____

- Pascal
- C#
**machine language**Correct- C

A digital multiplexer is a combinational circuit that selects ___________

- Many decimal outputs and accepts the selected information
**One digital information from several sources and transmits the selected one**Correct- Many digital information and convert them into one
- Many decimal inputs and transmits the selected information

A technique that allocates time slots dynamically.

**Statistical TDM**Correct- Dynamic TDM
- WDM
- TDM

ABC is a valid hexadecimal number.

**True**Correct- False

Boolean Function is of the form of ________

- K=f(X,Y,X)
**Truth values**Correct- Algebraic Expression
- Truth Table

Convert (22)8 into its corresponding decimal number.

- 81
- 82
**18**Correct- 28

Convert (52)16 into its decimal equivalent.

- 28
- 83
**82**Correct- 80

Convert 111 110 010 from base 2 to base 8

- 215
- 672
**762**Correct- 125

Convert the binary equivalent 10101 to its decimal equivalent.

- 22
- 12
- 31
**21**Correct

Convert the binary number 11001 to decimal.

- 3
- 15
- 13
**25**Correct

For a two-input XNOR gate, with the input waveforms as shown below, which output waveform is correct?

**d**Correct- b
- a
- c

For the device shown here, assume the D input is LOW, both S inputs are LOW and the input is LOW. What is the status of the Y’ outputs?

- All but Y0 are LOW
- All are HIGH
**All but Y0 are HIGH**Correct- All are LOW

For voice, each channel contains a ___ word of digitized data.

**1**Correct- 4
- 0
- 2

How many AND gates are required to realize the following expression Y=AB+BC?

- 4
- 1
**2**Correct- 8

How many AND, OR and EXOR gates are required for the configuration of full adder?

- 1, 2, 2
- 3, 1, 2
**2, 1, 2**Correct- 4, 0, 1

How many select lines would be required for an 8-line-to-1-line multiplexer?

- 4
- 2
**3**Correct- 8

If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

- 8
- 2
**1**Correct- 7

If a 3-input NOR gate has eight input possibilities, how many of those possibilities will result in a HIGH output?

**1**Correct- 2
- 8
- 7

If a signal passing through a gate is inhibited by sending a LOW into one of the inputs, and the output is HIGH, the gate is a:

- AND
**NAND**Correct- OR
- NOR

In a multiplexer the output depends on its ___________

- Enable pin
- Data inputs
**Select inputs**Correct- Select outputs

In a number system, each position of a digit represents a specific power of the base.

- True
**False**Correct

In double precision format, the size of the mantissa is ______

- 72
**52 bit**Correct- 32 bit
- 64

In parts of the processor, adders are used to calculate ____________

- Increment and decrement operators
- Table indices
- Addresses
**All of the Mentioned**Correct

In the boolean function w=f(X,Y,Z), what is the RHS referred to as ________

- literals
- right hand side
**expression**Correct- boolean

In the hexadecimal system, we allow _______ values for each digit of a number

- 10
- 8
**16**Correct- 2

In the IEEE floating point representation, the hexadecimal value 0 × 00000000 corresponds to

- the normalized value 2-127
**the special value +0**Correct- the normalized value +0
- the normalized value 2-126

It is rooted in binary code, a series of zeroes and ones each having an opposite value.

- Decimal Base
- Numeric System
- Radix Number System
**Digital Logic**Correct

Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?

- Low input voltages
**Cross coupling**Correct- Gate impedance
- Synchronous operation

Let r denote number system radix. The only value(s) of r that satisfy the equation

- decimal 10
- decimal 11
**any value > 2**Correct- decimal 10 and 11

Many time slots are wasted in __________

- FDM
- Asynchronous TDM
- TDM
**Synchronous TDM**Correct

New CPU whose instruction set includes the instruction set of its predecessor CPU is said to be ___________ with its predecessor.

- fully compatible
- forward compatible
**backward compatible**Correct- compatible

Number of outputs in a half adder _____________

**2**Correct- 1
- 3
- 0

One multiplexer can take the place of ___________

**Several SSI logic gates or combinational logic circuits**Correct- Combinational logic circuits
- Several Ex-NOR gates
- Several SSI logic gates

Output will be a LOW for any case when one or more inputs are zero for a:

**AND Gate**Correct- OR Gate
- NOT Gate
- NOR Gate

P is a 16-bit signed integer. The 2's complement representation of P is (F87B)16.The 2's complement representation of 8*P

**(C3D8)16**Correct- (F878)16
- (187B)16
- (987B)16

The ________ gate is an OR gate followed by a NOT gate.

- NAND
**NOR**Correct- EXNOR
- EXOR

The 1’s complement of 1111111110.101 is _______________

**1010**Correct- 0000000000010
- 1111111110101
- 1101

The 10’s complement of 562 is __________

- 4
- 7
**3**Correct- 8

The 16’s complement of 74E will be __________

- 8C2
- 2B8
- 8B2
**F8B2**Correct

The 32 bit representation of the decimal number is called as ____

- Extended format
- Double-precision
- None of the mentioned
**Single-precision**Correct

The 9’s complement of 6578 is ___________

- 3124
- 3420
**3421**Correct- 1234

The binary equivalent of the decimal number 10 is __________

- 0010
- 10
- 010
**1010**Correct

The binary number 111 in octal format is ________________

**7**Correct- 6
- 5
- 8

The binary number 1110 in hexadecimal format is _____________

**E**Correct- 15
- 14
- 6

The Boolean expression for a 3-input AND gate is ________.

- X = AB
- X = A + B + C
- X = AB + C
**X = ABC**Correct

The carry propagation can be expressed as ________

- All but Y0 are HIGH
- Cp = AB
**Cp = A + B**Correct- All but Y0 are LOW

The complement of the input given is obtained in case of:

- AND+NOR
- NOR
- EX-OR
**NOT**Correct

The complement term for X’.Y’.Z + X.Y will be _____________

- XYZ’+X’Y’
- (X+Y+Z’)(X’+Y)
**(X+Y+Z’)(X’+Y’)**Correct- (X+Y+Z’)(X’+Y)

The decimal value 0.5 in IEEE single precision floating point representation has

- fraction bits of 000…000 and exponent value of 0
- fraction bits of 100…000 and exponent value of 0
**fraction bits of 000…000 and exponent value of −1**Correct- fraction bits of 100…000 and exponent value of 0

The device shown here is most likely a ________

- Inverter
**Demultiplexer**Correct- Multiplexer
- Comparator

The expression of a NAND gate is_______

- AB
- (A+B)’
- A’B+AB’
**(AB)’**Correct

The following figure shows a ___________ gate.

**NOR**Correct- EXOR
- NAND
- OR

The format used to present the logic output for the various combinations of logic inputs to a gate is called a:

**truth table**Correct- input logic function
- Boolean constant
- Boolean variable

The general form for calculating the number of rows in a truth table is ________

- 2n+1
- -2n
**2n**Correct- 2n-1

The input hexadecimal representation of 1110 is _______________

- 15
- 14
**E**Correct- 0111

The max term when X=Y=Z=1 is ________

- x+y+z
- x’y’z’
- xyz
**x’+y’+z’**Correct

The maximum number of bits sufficient to represent a hexadecimal number in binary:

- 7
- 3
**4**Correct- 8

The min term when X=Y=Z=0 is _____________

- x+y+z
- x’+y’+z’
- xyz
**x’y’z’**Correct

The minterm of any expression is denoted by ___________

**m**Correct- Mt
- M
- min

The normalized representation of 0.0010110 * 2 9 is _______

- 0 10001000 0010110
**0 10000101 0110**Correct- 0 10101010 1110
- 0 11110100 11100

The number of literals in the expression F=X.Y’ + Z are _____________

- 4
- 2
**3**Correct- 1

The numbers written to the power of 10 in the representation of decimal numbers are called as _____

- Height factors
**Scale factors**Correct- Size factors
- None of the mentioned

The octal equivalent of 1100101.001010 is ______

- 62412
- 14521
- 15412
**14512**Correct

The Output is LOW if any one of the inputs is HIGH in case of a _________ gate.

**NAND**Correct- NOR
- AND
- OR

The output of a NOR gate is HIGH if ________.

- any input is HIGH
- all inputs are HIGH
- any input is LOW
**all inputs are LOW**Correct

The output of an AND gate with three inputs, A, B, and C, is HIGH when ________.

- A = 1, B = 0, C = 1
- A = 0, B = 0, C = 0
- A = 1, B = 1, C = 0
**A = 1, B = 1, C = 1**Correct

All courses