1⟩ How to increase the gain and directivity of an antenna?
By increasing no of director, we can increase gain.
Electronics Engineering
Home Engineering Electronics Engineering
“Electronics Engineering frequently Asked Questions in various Electronics Engineering job Interviews by interviewer. Get preparation of Electronics Engineering job interview questions.”
185 Electronics Engineering Questions And Answers
2⟩ Explain how to measure the insulation resistance for printed circuit boards?
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.
3⟩ Explain why do you use two ground pins in microprocessor 8086?
Two ground terminals are provided to make the pin structure symmetrical o/w it requires only 39 pins.
4⟩ Tell me what is Memristor? How many modes it works? Also what is its Advantage? How It differ from others & why the name evolve? & What is its Uses?
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.
5⟩ Explain is RFID in developing stage? What is scope in RFID?
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.
6⟩ Tell me does area of work only involve closed spaces?
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.
7⟩ Explain with examples of circuit protecting device apart from fuse, circuit beaker, relays, lighting arrestor, switch gears?
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
8⟩ Tell me In a MOSFET, What does the pinch off voltage refers to?
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.
9⟩ What is the importance of the biasing in transister circuits?
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.
10⟩ Why we need biasing for Transistor, FET and MOSFET?
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.
11⟩ What is selective flooding?
Flooding most often occurs when a large enough number of packets (the droplets in a stream of data) are flowing through the network that regular data cannot be sent in a normal speed and fashion. Generally it a packet/response of syn/ack or synpackets: the intialization of connections between 2 tcp/ip hosts requires a set of back and forth responses eg. "hey, are you there?" "yes, I'm here." "Are you ready to receive data?" "yes I am, go."
A synflood consists of something like that horrible Verizon Mobile commercial - "Can you hear me now? Can you hear me now? Can you hear me now? Can you hear me now? Can you hear me now? Can you hear me now? Can you hear me now?....." you get the idea. Synflood hosts don't respond to the "yes" back from destination, they keep just asking over and over. The faster the flood, the slower the network and computers on the network will run. There are people who take remote control of a large number of pcs (a zombienet or bot-net) and use these to flood the victim with even larger numbers of syn packets. They get control usually by malware (viruses or trojans) and often can't be traced.
Innocent flooding can occur when a router is given a circular route to some of the hosts on the network - the router asks for the response from a certain host and another router says 'I know where that is.. it's (another interface on the first router)' and passes the requst to router 1, who then passes it again to router 2, who sends it to router 1, who sends it to router 2 ..... using protocols to test for and close internal loops in a network will most often stop flooding.
12⟩ Tell me what is Race Around Condition in a JK FlipFlop? How it can be avoided?
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.
13⟩ We take the area of collector wide comparison to base and emitter. Why?
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.
14⟩ Explain what is the difference between inductance and resistance?
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
15⟩ Tell me can a gas be used for conducting current?
Yes, Gas need to be ionized, like in fluorescent lamps, flash bulbs etc.
16⟩ Explain what is the difference Allen Bradley and Siemens plc
allen bradley plc software can use for programming offline otherwise siemens software can`t use in offline only use in online mode
17⟩ Which of the following are used to display measured quantity by digital meter?LED,LCD,CRO?
CRO
18⟩ Explain the output of the lexical analyser is1. a set of regular expressions2. syntax tree3. set of tokens4. string of characters
3. set of tokens
19⟩ What is the formula for power gain when input gain & output gain is given?
Power gain=Output power/Input power
20⟩ Tell me why the shape of OP-AMP is triangular not other shape?
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
