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Computer Organization

Description: Basics of Logics Gates , Counters , Encoders and decoders and more.
Number of Questions: 25
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Tags: Logic and universal gates truth tables decoders encoders counters multiplexer and more Computer Analysis and Design
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Which of the following is/are Universal Logic Gates?

  1. NAND

  2. NOT

  3. NOR

  4. Both (1) and (3)


Correct Option: D
Explanation:

NAND and NOR are Universal Logic Gates because these gates have the properties of combinations in them which can be used to accomplish any of the basic operations and can thus produce an inverter, OR / AND gate.

How many flips flops are used to design the module-20 counter?

  1. 4-flips flop

  2. 5 flip-flop

  3. 20 flip- flop

  4. None of the above


Correct Option: B
Explanation:

Each flp flop has two outputs , one for the normal value and the other giving the opposite value of what satae is stored . Therfore 5 flip flip are used.

How many minimum number of bits are used in representing range - 23 to + 31?

  1. 7

  2. 9

  3. 6

  4. 0


Correct Option: A
Explanation:

The numbers range from -23 to +31represented bt minimum 7 bits and 1 additional bit is used for indication for sign bit.  

What is the basic circuit support by ECL?

  1. NAND logic

  2. NOR logic

  3. OR - NOR logic

  4. Both (2) and (3)


Correct Option: C
Explanation:

ECL means Emitter coupled logic. The Basic circuit of ECL support OR NOR logic.

What will be the sum of two hexadecimal numbers; 9AA and 23D?

  1. BC7

  2. BE7

  3. BF7

  4. BA7


Correct Option: B
Explanation:

Calculation: 9AA = 9 10 1023D=  2  3  13----------------------  11 14 23  = 11 14 (16+7)                                11 14 7. Final Answer =  B E 7 

Which gate is used in CARRY operation of Half adder?

  1. OR gate

  2. NAND gate

  3. AND gate

  4. None of the above


Correct Option: C
Explanation:

AND is used in CARRY operation of Half adder.

Where is/are the fourth generation computers mainly used?

  1. VLSI

  2. LSI

  3. SSI

  4. Both (1) and (2)


Correct Option: D
Explanation:

Fourth generation computers mainly used in VLSI and LSI technology,  VSI -Large scale Integrated circuits and VLSI - Very large scale integrated circuits.

How many 256 X 4 RAM chips are required to construct a 2 KB cache?

  1. 16

  2. 32

  3. 64

  4. None of the above


Correct Option: A
Explanation:

16 chips are required to construct a 2KB cache.

What is the Hamming Distance between 101101 and 110010?

  1. 4

  2. 5

  3. 6

  4. None of the above


Correct Option: B
Explanation:

Hamming distance is used for error detection during data communication. So, distance is calculated by total of dissimilar bits, which is 5.

Which memory is a semiconductor memory?

  1. SRAM

  2. ROM

  3. DRAM

  4. All of the above


Correct Option: D
Explanation:

ROM (Read Only Memory), SRAM(static random accesss memory) and DRAM(dynamic RAM) all are types of semiconductor memories.

Which of the following is the indicator of flags in status register in ALU?

  1. Carry

  2. Zero

  3. Sign

  4. All of the above

  5. Parity


Correct Option: D
Explanation:

Flags hold a single bit to indicate certain conditions that arise during arithmetic and logical operations. The imporatant flag indicators are Carry , Zero , Sign and Parity . 
Flags hold a single bit to indicate certain conditions that arise during arithmetic and logical operations. The imporatant flag indicators are Carry , Zero , Sign and Parity . 

What should be the instruction length to avoid wastage of memory?

  1. Word size

  2. Depends on multiple of character size

  3. Word size which is a multiple of character size

  4. All of the above


Correct Option: C
Explanation:

To avoid wastage of memory, the instruction length should be word size, which is a multiple of character size.

How can we implement DRAM cells?

  1. By using capacitors

  2. By using flags

  3. By using flip flops

  4. None of the above


Correct Option: A
Explanation:

DRAM cells are implemented by using capacitors, because they periodically refreshed, in a very short time.

How does DMA module communicate with CPU?

  1. By intrerrupts

  2. By priority set

  3. By cycle stealing

  4. All of the above


Correct Option: C
Explanation:

Cycle stealing is a stategy whereby DMA module uses the system bus to move data between the I/O module/exeternal devices at times, when the CPU is not using the bus.

Which of the following is called a one bit asynchronous counter sequential circuit?

  1. Mapple counter

  2. Binary counter

  3. Ripple counter

  4. None of the above


Correct Option: C
Explanation:

Ripple is a one bit asynchronous sequential counter circuit.

Which of the following memories is installed between CPU and Main Memory?

  1. Ramdom Access Memory

  2. Virtual Memory

  3. Cache Memory

  4. Both (2) and (3)


Correct Option: C
Explanation:

Cache memory is installed between CPU and Main memory in memory hierarchy.

Which program is used to place machine language program in a main memory in executable form?

  1. Loader

  2. Translator

  3. Interpreter

  4. None of the above


Correct Option: A
Explanation:

 Loader is a program, used to place machine language program in a main memory in executable form.

A sequence of micro instruction is also called as

  1. hardware

  2. freeware

  3. firmware

  4. None of these


Correct Option: D
Explanation:

All the above answers are incorrect. The sequence of microinstruction is called microprogam.

Which of the following memories is the most expensive memory?

  1. DRAM

  2. SRAM

  3. ROM

  4. Both (1) and (2)


Correct Option: B
Explanation:

SRAM is expensive than DRAM and ROM because it stores information as long the power supply on and it also consumes more power.

______________ are expanded during program execution.

  1. Signals

  2. Macros

  3. Micros

  4. None of the above


Correct Option: B
Explanation:

Macros are expanded during program execution. A macro is a group of instructions that perform tasks.

What do we call a combinational circuit connecting multiple inputs to a single output?

  1. Full adder

  2. Decoder

  3. Mutiplexer

  4. None of the above


Correct Option: C
Explanation:

Multiplexer is a combinational circuit having multiple input into one output. For example: 4x1 MUX = 4 inputs and 1 output.

A _______ is a shared communication which consists of one or a collection of lines.

  1. BUS

  2. Star

  3. Mesh

  4. None of the above


Correct Option: A
Explanation:

BUS is a shared communication, consisting of one or a collection of lines. The CPU, memory and I/O devices may be connected by a common BUS topology.

Which type of flip - flop racing problem does not exist?

  1. D flip fop

  2. Master slave J K flip flop

  3. S R fip flop

  4. None of the above


Correct Option: B
Explanation:

Master slave J K flip flop prevents the data from racing through chain, at every clock pulse, the pattern is shifted only exactly one position.

How much memory can be addressed with a 16 bit program counter?

  1. 256 K

  2. 64 K

  3. 32 K

  4. 128 K


Correct Option: B
Explanation:

A CPU with a 16 bit program counter can address 64K(65536) memory locations.

What term is used for 'data lines that provide path for moving data between modules'?

  1. Address Bus

  2. System Bus

  3. Data Bus

  4. All of the above


Correct Option: C
Explanation:

Data lines provide path for moving data between data system modules called as data bus. Example - 32 bit path data bus is viewed as a collection of wires.

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