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Digital Computer Electronics
Quiz 5
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Q.1
Conversion of an octal number 47
8
to its binary number is
110011
2
100111
2
110011
2
1111011
2
None of the above
Q.2
A half-adder is also known as:
AND circuit
NAND circuit
NOR circuit
EX-OR circuit
None of the above
Q.3
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.4
A _____ is a group of devices that store digital data.
circuits
register
variations
bit
None of the above
Q.5
Conversion of an octal number 3137
8
to it's decimal equivalent is
1631
10
1632
10
1531
10
1931
10
None of the above
Q.6
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.7
The number of binary bits required to represent a hexadecimal digit is
3
4
6
8
None of the above
Q.8
Instead of counting with binary numbers, a ring counter uses words that have a single high _____
bytes
bit
gate
chip
None of the above
Q.9
Multiplication of 111
2
by 101
2
is
110011
2
100011
2
111100
2
000101
2
None of the above
Q.10
The maximum number of TTL loads that a TTL device can drive reliably over the specified temperature range is
fanout
bipolar
chip
universal logic circuit
None of the above
Q.11
Conversion of hexadecimal number 6B2
16
to it's binary number equivalent is
1111000110111
2
011010110010
2
0110011001111
2
11111111
2
None of the above
Q.12
The output of the following gate is 0 only if at least one of the inputs is 1:
AND gate
OR gate
EX-OR gate
NOR gate
None of the above
Q.13
For what logic gate the outputs in complement of the input?
NOT
AND
OR
XOR
None of the above
Q.14
What is the decimal equivalent of 2
10
?
4096
1024
1000
16
None of the above
Q.15
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.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
Resistor Ratio design is used in linear ICs because
Ratios increase input resistance
Ratios increase amplifier gain
Precise resistor values are not possible with IC processes
All of the above
None of the above
Q.18
What advantages do ICs have over discrete-device circuits due to their greater complexity (i.e. more circuitary in less area)
Smaller size
Higher reliability
Lower cost
All of the above
None of the above
Q.19
Conversion of an octal number 136
8
to hexadecimal number is
7E
16
5E
16
5A
16
5D
16
None of the above
Q.20
What logic function is produced by adding an inverter to the output of an AND gate?
NAND
NOR
XOR
OR
None of the above
Q.21
Conversion of decimal number 28
10
to it's octal number equivalent is
32
8
40
8
34
8
36
8
None of the above
Q.22
The control and arithmetic-logic sections are called the _____
Block diagram
Control Unit
Input / Output Unit
Central Processing Unit
None of the above
Q.23
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.24
Division of 100011
2
by 101
2
is
100
2
111
2
101
2
1010
2
None of the above
Q.25
The NOR gate is logically equivalent to an OR gate followed by an _____
AND
XAND
XOR
inverter
None of the above
Q.26
What is the ASCII code for T?
1010100
1011010
1011100
1011111
None of the above
Q.27
Express 8192 in K units.
8 x 10
3
K
8.192 k
8K
All of the above
None of the above
Q.28
The dynamic race hazard problem occurs in
combinational circuits only
sequential circuits only
both combinational and sequential circuits
none of the combinational and sequential circuits
None of the above
Q.29
In boolean algebra, the overbar stands for the NOT operation, the plus sign stands for the _____ operation.
AND
OR
NAND
NOR
None of the above
Q.30
The reduced form of the Boolean expression (A+B)(A+C) is:
AB+AC
A+B+C
AC+B
A+BC
None of the above
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