41⟩ Why does sidebands vl come in case of analog modulation?
Please share your answers.
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185 Electronics Engineering Questions And Answers
42⟩ What is the equivalent of negative logic AND gate?
Negative Logic equivelent of AND gate is OR gate.
43⟩ Explain how to design a software IC using VHDL?
you can use software like altera, write the required programme download to the chip,here is your software ic
44⟩ Explain what is the difference between PLC and DCS?
PLC means Programmable Logic Controller, which can be used to control one particluar control system such as a boiler or a injection system.
but DCS is Distributed control syetem, which is used to monitor and control the total process plant. in DCS we have no of controllers connected to a single monitoring system.
45⟩ How many states does signal has?
as i think,basically there are 3 states in a signal: on state, off state, tri state
46⟩ Explain what is difference between Fixed-Bias Circuit & Self-Bias Circuit?
Fixed bias circuits get their bias voltages from independently designed reference voltage sources (or even something as simple as a voltage divider). Often is the case that the bias may be left for the end-user to give some control over the operation point of the circuit.
Self biased circuits get their bias voltages from the circuit itself, often in the form of a negative feedback. This is very useful when a circuit is extremely sensitive to bias points and it becomes impractical to provide external biases that are correct to very high accuracies. This can happen in high gain amplifiers with very high impedance output nodes, such as a common source amplifier with an active load. The operation of the circuit dependson the bias of the active load. It would therefore be desirable to sacrifice some of this gain by providing a negative feedback from the output to the gate of the active load. This way, you wont have to bias the circuit yourself, but will lose some of the gain of the circuit as a price.
47⟩ What is RTOS?
RTOS is a real time operating system. the main difference between an operating system and RTOS is the response time.
An operating system will or may response for the user input at any time.... But a RTOS should response for the input with in a finite time. it should not delay like an ordinary operating system. Thats why in many electronic applications RTOS is used...
48⟩ What is the operating voltage of laser?
There is no particular operating voltage for the operation of laser. Small voltage is enough to glow that laser, the principle of laser is the excitation of atoms from lower state to higher state. For playing purpose of laser the desired voltage is 3V. Lasers are also used for medical and Industrial pupose, those lasers are highly intensive and powerful, generally those operating voltages are about 200V to 2kV
49⟩ Explain how micro processor works without internal memory?
microprocessor works without internal memory because ,it consists of adreess,data and control buses with some registers to process the task given to processor through the external memory.
50⟩ What are digital electronic flip flops, State the different types of flip flop and their uses?
digital electronic flip flops are temporary single bit storage devices.different types of flip flops are JK f/f, RS f/f, T F/F, D f/f this flip flops are using as storage device, delay purpose , as counter , for toggled, as shift register etc
51⟩ What is Pulse Width Modulation?
Pulse width modulation is a modulation technique in which the width of the pulse is varied in accordance with the message signal. Pulse width Modulation is abbreviated as PWM.
PWM can be used to reduce the total amount of power delivered to a load without losses normally incurred when a power source is limited by resistive means. This is because the average power delivered is proportional to the modulation duty cycle. With a sufficiently high modulation rate, passive electronic filters can be used to smooth the pulse train and recover an average analog waveform.
PWM is used in sound synthesis circuits.
52⟩ Which one is faster between NAND-SR FF and NOR-SR FF?
well both deals with same principle.but i think NAND-SR FF is faster than NOR-SR FF
53⟩ What is Interfacing?
The peripheral (simple input/output devices ) connected with computer to perform tasks is known as interfacing.
54⟩ What is Virtual Grounding?
In electronics, a virtual ground (or virtual earth) is a node of a circuit that is maintained at a steady reference potential, without being connected directly to the reference potential.
55⟩ What is cache coherency and snooping
Please share your answers.
56⟩ Explain why the input impedance of OP-Amp is so high?
In OPAMP, we have 4 stages, 1st stage, i.e the input stage is a dual i/p balanced o/p opamp whose i/p resistance is v high. and if we use FET in case of BJT for 1st stage diffamp, then i/p resistance will be v high in M ohms.
57⟩ Which of the following is not an input device1. MICR 2. OCR3. DVD 4. JOYSTICK
OCR
58⟩ What is Fbus protocol and its use?
Please share your experience.
59⟩ If a clock with time period T is used with n stage shift register,the output of the final stage will be delayed by1. nT seconds 2. (n-1)T seconds3. n/T seconds 4. (2n-1)T seconds
nT seconds
60⟩ Design a digital circuit which has one input two output and one select lineinput should be 1000khzoutput should be 500khz and 250Khzselect line either 0 or 1if 0 select 250khzif 1 select 500khz?
1000kHz (input) to a DEMUX with a Select line.
1st output connected to D Flipflop (acts as divide by 2) thus 500kHz.
2nd output connected to TWO D Flipflops (acts as divide by 4 ) thus 250kHz.
