Electronics & Communication Engineering :: Digital Electronics

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The software that transfers the object program from secondary memory to the main memory is called


Aassembler

Bloader

Clinker

Dtask builder

Answer: Option B

Explanation:

In Computing, a loader is the part of an Operating System that is responsible for loading programs. It is one of the essential stages in the process of starting a program. Because it places programs into memory and prepares them for execution.

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Which of the following modulation schemes is digital in nature?


APulse Amplitude Modulation

BPulse Position Modulation

CPulse Width Modulation

DDelta Modulation

Answer: Option D

Explanation:

A delta modulation is an analog-to-digital and digital-to-analog signal conversion technique used for transmission of voice information where quality is not of primary importance.

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If the input to T-flip-flop is 120 Hz signal, then the final output of the three T-flip-flops in cascade will be:


A15 Hz

B18.5Hz

C12.5Hz

D5oHz

Answer: Option A

Explanation:

T=f/(2 ^N) where N is the number of flipflops in cascade so 120/8= 15Hz

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The timing network that sets the output frequency of a 555 astable circuit contains ________.


Athree external resistors are used

Btwo external resistors and an external capacitor are used

Can external resistor and two external capacitors are used

Dno external resistor or capacitor is required

Answer: Option B

Explanation:

To find Astable multivibrator output frequency. The formula is Output frequency = 1.44 / [ (R1+2R2)*C ].So we need 2 external resistors and external capacitor.

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Using 4-bit numbers (n = 4) if k = (0011)2 how is k expressed in 2's complement.


A(1011)2

B(1101)2

C(1100)2

D(0101)2

Answer: Option B

Explanation:

In 2's complement simply find 2's complement ? (0011)2 * 1100 + 1 * (1101)2 . (Technique: Make all 1's zero and all 0's one and then add 1. You will get 2's complement.

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In a JK flip-flop, J is connected to


ARS Flip Flop

BD Flip Flop

CT Flip Flop

DClocked RS FF

Answer: Option B

Explanation:

According to the question below is the figure.Seeing the truth table both the input is opposite to each other hence it is D Flip Flop.


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The principle of locality of reference justifies the use of


Ainterrupts

BDMA

Cvirtual memory

Dcache memory

Answer: Option D

Explanation:

Locality of reference, also known as the principle of locality, is a term for the phenomenon in which the same values, or related storage locations, are frequently accessed, depending on the memory access pattern, hence the answer is Cache memory which is accessed always the first whenever cpu wants any information for processing.

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