The operation which commutative but not associative is

COMPUTER ARCHITECTURE - DIGITAL COMPONENTS MCQ

• Which of the following shift operations divide a signed binary number by 2 ?
• Normally digital computers are based on
• BCD stands for
• The basic circuit ECL supports the
• An adder-subtractor single unit can be designed using full adder and
• Which of the following is not a universal building block ?
• CARRY in half adder can be obtained using
• A NAND gate has inputs A and B. It's output is connected to the both of the inputs of another NAND gate. An equivalent gate for these two NAND gates is
• The operation which commutative but not associative is
• In which of the following gates, the output is 1 if and only if at least one input is 1?
• The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____
• The functional difference between SR flip-flop and JK flip-flop is that
• With an RS latch a high S and low R sets the output to _____ ; a low S and a high R _____ the output to low
• Flip-flop outputs are always
• A NOR gate has two or more input signals. All input must be _____ to get a high output
• An inverter is also called a _____ gate
• With a NAND latch a low R and a low S produce a _____ condition
• The simplified form of the Boolean expression (X + Y + XY)(X + Z) is
• De Morgan\'s first theorem says that a NOR gate is equivalent to a bubbled _____ gate
• A combinational logic circuit which is used when it is desired to send data from two or more source through a single transmission line is known as
• How many Flip-Flops are required for mod–16 counter?
• The digital logic family which has minimum power dissipation is
• Data can be changed from special code to temporal code by using
• A ring counter consisting of five Flip-Flops will have
• The speed of conversion is maximum in
• The gates required to build a half adder are
• If the input to T-flipflop is 100 Hz signal, the final output of the three T-flipflops in cascade is
• The device which changes from serial data to parallel data is
• A device which converts BCD to Seven Segment is called
• The access time of ROM using bipolar transistors is about
• The A/D converter whose conversion time is independent of the number of bits is
• A 4-bit synchronous counter uses flip-flops with propagation delay times of 15 ns each. The maximum possible time required for change of state will be
• Words having 8-bits are to be stored into computer memory. The number of lines required for writing into memory are
• In successive-approximation A/D converter, offset voltage equal to 1/2 LSB is added to the D/A converter’s output. This is done to
• How many flip flops are required to construct a decade counter
• Which TTL logic gate is used for wired ANDing
• The MSI chip 7474 is
• When the set of input data to an even parity generator is 0111, the output will be
• How many flip-flops are required to construct mod 30 counter
• The number of control lines for 16 to 1 multiplexer is
• The number of control lines for 32 to 1 multiplexer is
• The logic 0 level of a CMOS logic device is approximately
• How many select lines will a 32:1 multiplexer will have
• Which of following consume minimum power?
• ABCD - seven segment decoder / driver in connected to an LED display. Which segments are illuminated for the input code DCBA = 0001
• How many flip-flops are required to produce a divide-by-32 device?
• A demultiplexer can be used as
• 'n' Flip flops will divide the clock frequency by a factor of
• If the clock input applied to a cascaded Mod-6 & Mod-4 counter is 48KHz. Than the output of the cascaded arrangement shall be of
• Logic gates with a set of input and outputs is arrangement of
• A flip-flop is a binary cell capable of storing information of
• A device/circuit that goes through a predefined sequence of states upon the application of input pulses is called
• A combinational logic circuit which sends data coming from a single source to two or more separate destinations is
• Advantage of synchronous sequential circuits over asynchronous ones is
• A basic AND gate consists of ______________inputs and an output
• In the AND gate, the output is ‘High’ or gate is ‘On’ only if both the inputs are ______________
• It is a simple combinational digital circuit built from logic gates
• It is used to subtract two inputs having more than one bit
• It is a circuit, which subtracts two inputs each of one bit
• It is the converse of decoding and contains 2^n (or fewer) input lines and n output lines
• It directs data from input to a selected output line
• It is a very useful combinational circuit used in communication systems
• This converter deals with converting binary code to gray code
• It compares two n-bit values to determine whether one of them is greater or if they are equal
• It is a circuit, which has a number of input lines and selection lines with one output line
• It is a circuit, which can remember values for a long time or change values when required
• It is a sequential circuit that cycles through a sequence of states
• It is a counter where the flip-flops do not change states at exactly the same time, as they do not have a common clock pulse
• It is a bi-directional counter capable of counting in either of the direction depending on the control signal
• In this logic, output depends not only on the current inputs but also on the past input values. It needs some type of memory to remember the past input values
• In a combinational circuit, each output depends entirely on the ________ inputs to the circuit
• In ________________ circuit, the output depends on both the present and the past inputs
• The steps required for the analysis of combinational circuits are
• Circuits that are more complex can be built using the __________ method
• BCD-to-Excess-3 Code Conversion is a example of a ______________
• The four common and useful MSI circuits are
• Decoders often come with an enable signal, so that the device is only activated when the enable E equals to ___________
• When more than one input can be active, the priority ____________ must be used
• A _________________ is a circuit, which can remember values for a long time or change values when required
• A ________________ circuit is not suitable in the synchronous circuit design because of its transparency nature
• There are________________ basic types of flip-flop based on clock trigger
• The characteristic equation of any flip-flop describes the __________________ of the next state in terms of the present state and inputs
• The normal data inputs to a flip-flop (D, S and R, J and K, T) are referred to as ________________ inputs
• Asynchronous inputs, just like synchronous inputs, can be engineered to be ______________
• ___________ and Clear should not be 0 at the same time; otherwise, both the outputs will be 1, which is known as invalid state
• Which table indicates the input conditions of the flip-flops necessary to cause all possible next state transitions of a flip-flop?
• When a circuit is self- correcting?
• A PLA consists of two-level____________ circuits on a single chip
• In which of the following types of counters, the flip-flops do not change states at exactly the same time?
• The number of states through which the counter goes is also known as ____________
• It contains an equal resistor or current source segment for each possible value of DAC output
• The total current can be converted into the corresponding voltage by using a/an _______________
• The number of resistors required for an N-bit DAC is 2N in the case of _____________
• The characteristics of a DAC, which are generally specified by the manufacturers
• To start the conversion in successive approximation DAC the programmer sets the MSB to ___________ and all other bits to __________
• The major block(s) of the dual- slope ADC
• A counter with 10 states
• In asynchronous flip-flop, ______________ and clear pin shows negation
• It is a single input version of J-K flip-flop formed by tying both the inputs of J-K
• In flip-flop, the ___________ arrow shows positive transition on the clock
• Gated S-R latch is a combination of which latch and gate?
• Which of the following is the advantage of PLD over ICs?
• In a DAC, the possible number of digital input is __________
• An n-bit register has a group of n flip-flops and some
• It does not have any external gate
• A register used to provide data movements
• There are ___________ basic types of shift registers
• This type of register accepts inputs data serially
• This type of register accepts inputs data simultaneously and output is also coming out parallel
• In this type of register, data can be shifted in either right or left direction by using control signal
• In this type of counter, the complement of the output of the last stage of the shift register is fed back to the D input of the first state
• In this type of counter, the output of the last stage is connected to the D input of the first stage
• A device that exhibits two different stable states and functions as a memory element in a binary system is known as______________________
• The different types of flip-flops are_____, __________ and____________
• The __________latch is an asynchronous flip-flop which can be constructed from two NAND gates connected back to back
• Memory is a circuit, which is used to store ____________ information
• A register that can be either static or dynamic
• Read Only Memory (ROM), as the name suggests, is meant only for __________information from it
• Memory can be classified on the basis of the ______________ technology used

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