FINALTERM EXAMINATION
Spring 2010
CS302- Digital Logic Design
Time: 90 min
M a r k s: 58
Question No: 1 ( M a r k s: 1 ) http://vuzs.net
A 8-bit serial in / parallel out shift register contains the value “8”, _____ clock signal(s) will be required to shift the value completely out of the register.
► 1
► 2
► 4
► 8
Question No: 2 ( M a r k s: 1 ) http://vuzs.net
A frequency counter ______________
► Counts pulse width
► Counts no. of clock pulses in 1 second
► Counts high and low range of given clock pulse
► None of given options
Question No: 3 ( M a r k s: 1 ) http://vuzs.net
In a sequential circuit the next state is determined by ________ and _______
► State variable, current state
► Current state, flip-flop output
► Current state and external input
► Input and clock signal applied
Question No: 4 ( M a r k s: 1 ) http://vuzs.net
The divide-by-60 counter in digital clock is implemented by using two cascading counters:
► Mod-6, Mod-10
► Mod-50, Mod-10
► Mod-10, Mod-50
► Mod-50, Mod-6
Question No: 5 ( M a r k s: 1 ) http://vuzs.net
In NOR gate based S-R latch if both S and R inputs are set to logic 0, the previous output state is maintained.
► True
► False
Question No: 6 ( M a r k s: 1 ) http://vuzs.net
Flip flops are also called _____________
► Bi-stable dualvibrators
► Bi-stable transformer
► Bi-stable multivibrators
► Bi-stable singlevibrators
Question No: 7 ( M a r k s: 1 ) http://vuzs.net
The minimum time for which the input signal has to be maintained at the input of flip-flop is called ______ of the flip-flop.
► Set-up time
► Hold time
► Pulse Interval time
► Pulse Stability time (PST)
Question No: 8 ( M a r k s: 1 ) http://vuzs.net
74HC163 has two enable input pins which are _______ and _________
► ENP, ENT
► ENI, ENC
► ENP, ENC
► ENT, ENI
Question No: 9 ( M a r k s: 1 ) http://vuzs.net
____________ is said to occur when multiple internal variables change due to change in one input variable ► Clock Skew
► Race condition
► Hold delay
► Hold and Wait
Question No: 10 ( M a r k s: 1 ) http://vuzs.net
Given the state diagram of an up/down counter, we can find __________
► The next state of a given present state
► The previous state of a given present state
► Both the next and previous states of a given state
► The state diagram shows only the inputs/outputs of a given states
Question No: 11 ( M a r k s: 1 ) http://vuzs.net
The _____________ input overrides the ________ input
► Asynchronous, synchronous
► Synchronous, asynchronous
► Preset input (PRE), Clear input (CLR)
► Clear input (CLR), Preset input (PRE)
Question No: 12 ( M a r k s: 1 ) http://vuzs.net
A logic circuit with an output 
consists of ________.
consists of ________. ► two AND gates, two OR gates, two inverters
► three AND gates, two OR gates, one inverter
► two AND gates, one OR gate, two inverters
► two AND gates, one OR gate
Question No: 13 ( M a r k s: 1 ) http://vuzs.net
A decade counter is __________.
► Mod-3 counter
► Mod-5 counter
► Mod-8 counter
► Mod-10 counter
Question No: 14 ( M a r k s: 1 ) http://vuzs.net
In asynchronous transmission when the transmission line is idle, _________
► It is set to logic low
► It is set to logic high
► Remains in previous state
► State of transmission line is not used to start transmission
Question No: 15 ( M a r k s: 1 ) http://vuzs.net
A Nibble consists of _____ bits
► 2
► 4
► 8
► 16
Question No: 16 ( M a r k s: 1 ) http://vuzs.net
The output of this circuit is always ________.
► 1
► 0
► A
► 
Question No: 17 ( M a r k s: 1 ) http://vuzs.net
Excess-8 code assigns _______ to “-8”
► 1110
► 1100
► 1000
► 0000
Question No: 18 ( M a r k s: 1 ) http://vuzs.net
The voltage gain of the Inverting Amplifier is given by the relation ________
► Vout / Vin = - Rf / Ri
► Vout / Rf = - Vin / Ri
► Rf / Vin = - Ri / Vout
► Rf / Vin = Ri / Vout
Question No: 19 ( M a r k s: 1 ) http://vuzs.net
LUT is acronym for _________
► Look Up Table
► Local User Terminal
► Least Upper Time Period
► None of given options
Question No: 20 ( M a r k s: 1 ) http://vuzs.net
DRAM stands for __________
► Dynamic RAM
► Data RAM
► Demoduler RAM
► None of given options
Question No: 21 ( M a r k s: 1 ) http://vuzs.net
The three fundamental gates are ___________
► AND, NAND, XOR
► OR, AND, NAND
► NOT, NOR, XOR
► NOT, OR, AND
Question No: 22 ( M a r k s: 1 ) http://vuzs.net
Which of the following statement is true regarding above block diagram ?
► Triggering takes place on the negative-going edge of the CLK pulse
► Triggering takes place on the positive-going edge of the CLK pulse
► Triggering can take place anytime during the HIGH level of the CLK waveform
► Triggering can take place anytime during the LOW level of the CLK waveform
Question No: 23 ( M a r k s: 1 ) http://vuzs.net
The total amount of memory that is supported by any digital system depends upon ______
► The organization of memory
► The structure of memory
► The size of decoding unit
► The size of the address bus of the microprocessor
Question No: 24 ( M a r k s: 1 ) http://vuzs.net
The expression F=A+B+C describes the operation of three bits _____ Gate.
► OR
► AND
► NOT
► NAND
Question No: 25 ( M a r k s: 1 ) http://vuzs.net
Stack is an acronym for _________
► FIFO memory
► LIFO memory
► Flash Memory
► Bust Flash Memory
Question No: 26 ( M a r k s: 1 ) http://vuzs.net
Addition of two octal numbers “36” and “71” results in ________
► 213
► 123
► 127
► 345
Question No: 27 ( M a r k s: 2 )
Define quantization process.
Question No: 28 ( M a r k s: 2 )
Explain the difference between 1-to-4 Demultiplexer and 2-to-4 Binary Decoder?
Question No: 29 ( M a r k s: 2 )
A general Sequential circuit consists of a combinational circuit and a memory element. How this memory element is implemented
Question No: 30 ( M a r k s: 2 )
Suppose a 2 bit up-counter, having states “A, B, C, D”. Write down GOTO statements to show how present states change to next states.
Question No: 31 ( M a r k s: 3 )
Name three Operations that can be performed on FLASH Memory
Question No: 32 ( M a r k s: 3 )
Explain Rotate Right Operation of shift register with the help of diagram.
Question No: 33 ( M a r k s: 3 )
You are given the block diagram of 74HC190 integrated circuit up/down counter, explain the function of labeled inputs/outputs.
Question No: 34 ( M a r k s: 5 )
Draw the state diagram of 3-bit up-down counter, use an external input X, when X sets to logic 1, the counter counts downwards, otherwise upward.
Question No: 35 ( M a r k s: 5 )
Differentiate between synchronous and asynchronous RAM.Question No: 36 ( M a r k s: 5 )
Explain Memory Select or Enable Signals
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