Q.1

How many full adders are required to construct an m- bit parallel adder?

  • m/2
  • m-1
  • m
  • m+1
  • None of the above
Q.2

In which of the following adder circuits, the carry look ripple delay is eliminated?

  • Half adder
  • Full adder
  • Parallel adder
  • Carry-look-ahead adder
  • None of the above
Q.3

Conversion of an octal number 1258 to its decimal number is

  • 9010
  • 8510
  • 8710
  • 9910
  • None of the above
Q.4

A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be _____ to get a low output

  • low
  • high
  • some low and some high
  • 0's
  • None of the above
Q.5

A logic circuit which is used to change a BCD number into an equivalent decimal number is

  • decoder
  • encoder
  • multiplexer
  • code converter
  • None of the above
Q.6

What table shows the electrical state of a digital circuit's output for every possible combination of electrical states in the inputs?

  • Function table
  • Truth table
  • Routing table
  • ASCII table
  • None of the above
Q.7

Conversion of an octal number 31378 to it's decimal equivalent is

  • 163110
  • 163210
  • 153110
  • 193110
  • None of the above
Q.8

A typical microcomputer may have up to 65,registers in its memory. Each of these registers, usually called a _____

  • address
  • memory location
  • registers
  • chip
  • None of the above
Q.9

A combinational logic circuit which generates particular binary word or number is

  • decoder
  • multiplexer
  • encoder
  • demultiplexer
  • None of the above
Q.10

The ASCII code is a 7-bit code for

  • letters
  • numbers
  • other symbols
  • All of the above
  • None of the above
Q.11

The logic 1 in positive logic system is represented by:

  • zero voltage
  • lower voltage level
  • higher voltage level
  • negative voltage
  • None of the above
Q.12

Conversion of an octal number 74328 to a binary number is

  • 11110001101112
  • 1111000110102
  • 1100110101112
  • 1111111110002
  • None of the above
Q.13

A half-adder is also known as:

  • AND circuit
  • NAND circuit
  • NOR circuit
  • EX-OR circuit
  • None of the above
Q.14

A gate is a logic circuit with one or more input signals but _____ output signal.

  • two
  • double
  • one
  • more than one
  • None of the above
Q.15

Standard TTL has a multiple emitter input transistor and a _____ output

  • totem-pole
  • bipolar
  • register
  • transistor
  • None of the above
Q.16

With positive clocking the clock signal must be _____ for the flip-flop to respond.

  • high
  • low
  • set
  • race
  • None of the above
Q.17

What is the main advantage of using MOSFET rather than bipolar transistor circuitary in ICs?

  • much greater complexity (more components) than bipolar circuits : better economy
  • higher operating speed than bipolar circuits
  • fewer power supply connections are required with MOS ICs
  • system designers are more familiar with MOS circuitary
Q.18

Cyclic codes are used in

  • data transfer
  • continuously varying signal representation
  • arithmetic and logical computation
  • All of the above
  • None of the above
Q.19

What is the hexadecimal equivalent of a binary number 10101111

  • AF
  • 9E
  • 8C
  • All of the above
  • None of the above
Q.20

Semiconductor memory is:

  • somewhat slower than magnetic core memory
  • a volatile memory
  • somewhat larger than the magnetic core memory
  • All of the above
  • None of the above
Q.21

Conversion of binary number 100000000002 to decimal number is

  • 102410
  • 103410
  • 112410
  • 103710
  • None of the above
Q.22

The 1's compliment of binary numberis:

  • 00101
  • 00010
  • 00110
  • 11101
  • None of the above
Q.23

The EXCLUSIVE - NOR gate is equivalent to an _____ gate followed by an invertor.

  • OR
  • AND
  • NAND
  • XOR
  • None of the above
Q.24

Conversion of an octal number 738 to binary number is

  • 1101112
  • 1111002
  • 1100102
  • 1110112
  • None of the above
Q.25

Conversion of decimal number 9910 to it's binary number equivalent is

  • 11000112
  • 1000112
  • 11100012
  • 111 10002
  • None of the above
Q.26

Conversion of an octal number 1438 to hexadecimal number is

  • 6316
  • 6016
  • 5016
  • 5716
  • None of the above
Q.27

Why are digital circuits easier to design than analog circuits?

  • they do not control electricity precisely over a wide range
  • they are made in the form of ICs
  • all elements of digital circuit are from the same family
  • they are smaller in size
  • None of the above
Q.28

A shift register moves the _____ left or right. Serial loading means storing a word in a shift register by entering _____ bit per clock pulse. With parallel or broadside loading, it takes only one _____ pulse to load the input word.

  • light, eight, clock
  • right, eight, clock
  • bits, one, register
  • bits, one, clock
  • None of the above
Q.29

The term sum-of-products in boolean algebra means

  • The AND function of several OR functions
  • The OR function of several AND functions
  • The OR function of several OR functions
  • The AND function of several AND functions
  • None of the above
Q.30

The digits used in a binary number system are _____ and _____

  • 9 and 0
  • 0 and 1
  • 1 and 2
  • 3 and 4
  • None of the above
0 h : 0 m : 1 s