Electronics Engineering Interview Questions And Answers

This question is not any kind of technical question but if it has been asked in interview the

we can say that
1) ground wire
2) insulators

can be said as the circuit protection device

No. Telecommunications equipment are sometimes scattered on a wide area (as one example), so you'd probably find the need to check for interference using a spectrum analyzer, etc.

RFID transponder is a special kind of radio transmitter and reciever. It is activated when it receives a signal of a specific kind. RFID transponders are present in smart cards and Radio Frequency Identification tags.

Memristor is a contraction of Memory Resistor it means that its store the value based on amount of Charge Has Passed through on the applied previously applied voltage it was postulated by Leon Chua from now 41 years ago and it is a 4th fundamental missing element now it can be considered as companion to RLC it gives the relation between Flux and Charge it is formally defined as rate of change of Flux with respect to Charge.

By increasing no of director, we can increase gain.

Because opamp having high input impedance due to differential amplifier connected at the input side which is in the range of MEGA ohms and low output impedance due to power amplifier used at the output stage of opamp.
Basically saying as opamp having high input impedance and low output impedance opamp shape shown by triangle.

Two ground terminals are provided to make the pin structure symmetrical o/w it requires only 39 pins.

Micro controller = micro processor + memory + interfacing features(ports) + additional features like counters.

A Micro controller can be directly connected to external devices. But a Processor needs a interface controller to connect with external input and output devices.

c) Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects

It is easy to convert the binary number to gray number. First, for example take a binary number i.e ,101101.


Step 1: 101101 first write the MSB as it is i.e, darken bit i.e, 1

Step 2: add MSB and bit next to the MSB i.e, 1+0=1

Step 3: again add 0 and 1 we get i.e, 0+1=1
Step 4: again add 1 and 1 we get 1+1=0

Step 5: in previous step carry is occurred so neglect that carry . note that don't add carry to next add numbers
then again add 1+0 1+0=1

step 6: add 0+1 0+1= 1

Answer: Gray Code is : 111011

for eg: code is 1101
this must be convert binary to gray then first 1 written as it is, 1 XOR 1
,1 XOR 0, 0 XOR 1.
then the gray code is 1 0 1 1

The Triangular shape symbolizes that it works for continous signals and hence forth it is an analog device.
ex: Opamp

If it is square then it is digital device.
ex: Multiplexer

If the shape is both triangular and square then it is mixed signal device.
ex: ADC, DAC

Power gain=Output power/Input power

If frequency of SMPF is reduced capacitor size is increased SMPF size also increased.

CRO

3. set of tokens

allen bradley plc software can use for programming offline otherwise siemens software can`t use in offline only use in online mode

Yes, Gas need to be ionized, like in fluorescent lamps, flash bulbs etc.

RESISTANCE:It is the property of the material by which it opposes the flow of current through it. the resistance is denoted by r and measured in ohms.

INDUCTANCE: It is the element in which energy is stored in the form of electromagnetic field. The inductance is denoted by l and measured in Henry

Emitter, base and collector are the three terminals of a transistor. Emitter emits majority carriers and is highly doped. Collector collects these majority carriers after the majority carriers reach base. Base is lightly doped region. As the collector is reponsible to collect majority carriers injected from the emitter it should have sufficient power handling capacity. This emphasises the need for largest area of capacitor.
Also area and doping of the base should be lowest because most of the carriers it obtains from the emmiter should contribute towards conduction.

When the input to the JK flip-flop is j=1 and k=1, the race around condition occurs, i.e it occurs when the time period of the clock pulse is greater than the propagation delay of the flip flop. so the output changes or toggles in a single clock period. If it toggles even number of times the output is same but if it toggles odd number of times then the output is complimented. To avoid race around condition we cant make the clock pulse smaller than the propagation delay so we use
1. Master slave JK flip flop
2. Positive or negative edge triggering
Since the hardware cost of msjk is more edge triggering is preferred to msjk.

Basically transister contains active region, saturation, cut off region. In saturation and cutt of region transister is used as a switch. To use transister as amplifier the operating point should be in exact middle of the active region.

As transistor is using as amplifier the operating point should be stable, in operating transister the temperature can fluctuate operating point, there by to avoid operating point fluctuation some mechnism must be used, this mechanism can be called as biasing.

Pinch off voltage is the excess voltage Vds applied which limits the current flowing into drain.. at that point the current saturates...and the o/p current remains constant.