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Total Practice Qs: 137+

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From the diagram given below showing characteristics of voltage across resistor and inductor with respect to time, what conclusion can be drawn due to exponential growth of current through inductor?


AVoltage across resistor and inductor increases

BVoltage across resistor and inductor decreases

CVoltage across resistor increases but decreases across inductor

DVoltage across resistor decreases but increases across inductor

Answer: Option C

Explanation:

Observing the graph we can see that Vr(t) is increasing and Vl(t) is decreasing gradually.

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What is the name of the pressure that moves electrons in a closed circuit?


AVoltage

Bohms

Camperes

Dcoulumbs

Answer: Option A

Explanation:

Voltage which is also called as electromotive force(pressure), is a measure of the potential difference in charge between two points in an electrical field which is responsible for the movement of electrons in a closed circuit.

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What is the value of ZL


AR

BR +

CR -

DNone of these

Answer: Option C

Explanation:

The value of load for maximum power transfer is given by complex conjugate of ZAB. ZAB

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The clock speed of 8085 is


A1MHz

B1KHz

C3.2KHz.

D3.2MHz.

Answer: Option D

Explanation:

8085 requires a signal +5V power supply and operates at 3.2 MHZ single phase clock.

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The processor status word of 8085 microprocessor has five flags namely:


AS, Z, AC, P, CY

BS, OV, AC, P, CY

CS, Z, OV, P, CY

DS, Z, AC, P, OV

Answer: Option A

Explanation:

8085 microprocessor has 5 status flag S ? Sign flag Z ? Zero flag AC ? Auxiliary carry flag P ? Parity flag CY ? Carry flag

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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 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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