What is Amplitude modulation? Why modulation is done? Relationship between Antenna length and frequency. Disadvantages of AM. How can we overcome disadvantages of AM. Disadvantages of DSBSC. What are other types of modulation techiques? Application of 2nd order circuits. Design the circuit which give output=4V when 2V input is given. Design a circuit which convert 2khz frequency to 4khz frequency. Design a circuit which convert 2khz frequency to 5khz frequency. What are the different types of diodes and draw their symbols. What are devices that are commonly used. Define logic families Name different types of ADCs(Analog to digital converter) Explain working of Counter type ADC with circuit. Which ADC has more accuracy? Output of open collector? Difference between microprocessor and microcontroller. Applications of microprocessor and microcontroller.

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Answers to various technical questions related to electronics and communication engineering.

Amplitude modulation is a technique of modulating a signal by varying its amplitude.
Modulation is done to transmit a signal over a long distance without losing its quality.
The relationship between antenna length and frequency is inversely proportional.
Disadvantages of AM include low efficiency, susceptibility to noise and interference, and limited bandwidth.
Disadvantages of DSBSC include the need for a coherent demodulator and the presence of a carrier signal.
Other types of modulation techniques include frequency modulation, phase modulation, and pulse modulation.
Second-order circuits are used in filters, oscillators, and amplifiers.
The circuit that gives an output of 4V when 2V input is given can be designed using an op-amp.
The circuit that converts 2kHz frequency to 4kHz frequency can be designed using a frequency doubler.
The circuit that converts 2kHz frequency to 5kHz frequency can be designed using a frequency multiplier.
Different types of diodes include Zener diode, Schottky diode, and LED.
Devices commonly used in electronics and communication engineering include transistors, capacitors, and resistors.
Logic families are groups of digital circuits that use the same logic gates.
Different types of ADCs include flash ADC, successive approximation ADC, and delta-sigma ADC.
Counter type ADC works by counting the number of clock pulses required to reach the input voltage level.
The ADC with more accuracy depends on the application and the required resolution.
Output of open collector is either low or high impedance.
Microprocessor is a single-chip CPU while microcontroller includes CPU, memory, and I/O interfaces.
Applications of microprocessor include personal computers, servers, and embedded systems while microcontroller is used in automation, robotics, and IoT.