Viva questions on analog electronics lab 3rd semester engineering?

Answer 1

For example , if you are conducting the RC coupled the amplifier, the will be frequency response curve , due to which cc ,cce and ccb of internal capacitance of the transistor ,

In that you have take the gain as 3db .. at frequency response ,they will ask why you have to select the #db.. instead of 3db you select $ or 6db's ..

I will tell the reason later !!!

Bye

Answer 2

Here are some potential analog electronics lab viva questions and answers:

Q: What is the purpose of a transistor? A: A transistor is a semiconductor device that can be used as an electronic switch or amplifier. It allows us to control the flow of current between two terminals by using a third terminal to apply a small signal that can turn the device on or off.

Q: What is a voltage divider and how does it work? A: A voltage divider is a circuit that allows us to divide a voltage into smaller portions. It consists of two resistors in series, and the voltage across the second resistor is proportional to the ratio of the two resistances. This is because the resistors create a voltage drop across them that is proportional to their resistance, and the total voltage is divided between them.

Q: What is a diode and how does it work? A: A diode is a two-terminal electronic component that allows current to flow in only one direction. It consists of a p-n junction, where one side of the junction is doped with a material that has an excess of holes (p-type) and the other side is doped with a material that has an excess of electrons (n-type). When a voltage is applied to the diode in the forward direction (i.e. with the positive terminal connected to the p-type material and the negative terminal connected to the n-type material), current can flow through the diode. However, when the voltage is applied in the reverse direction, the diode acts as an open circuit and no current can flow.

Q: What is the difference between an op-amp and a comparator? A: An op-amp is a type of amplifier that amplifies the difference between its two input terminals. It has a very high gain and can be used to amplify small signals to larger levels. A comparator, on the other hand, is a device that compares two voltages and outputs a digital signal indicating which voltage is higher. It has a very fast response time and is often used in digital circuits.

Q: What is the purpose of a capacitor in an AC circuit? A: A capacitor is an electronic component that stores electrical charge. In an AC circuit, it can be used to block DC signals and pass AC signals. This is because the capacitor charges and discharges in response to the AC signal, allowing the AC signal to pass through while blocking any DC component.

Q: What is the difference between a BJT and a MOSFET? A: A BJT (bipolar junction transistor) is a type of transistor that uses both electrons and holes to conduct current. It has three terminals: the base, the emitter, and the collector. A MOSFET (metal-oxide-semiconductor field-effect transistor) is a type of transistor that uses only electrons to conduct current. It has three terminals: the gate, the source, and the drain. MOSFETs are typically used in digital circuits, while BJTs are often used in analog circuits.

Q: What is the purpose of a feedback resistor in an op-amp circuit? A: A feedback resistor is used in an op-amp circuit to create negative feedback. This helps to stabilize the circuit and reduce distortion by providing a path for some of the output signal to be fed back into the input. The value of the feedback resistor determines the gain of the circuit, with higher values of resistance resulting in lower gain.

Q: What is the difference between a low-pass filter and a high-pass filter? A: A low-pass filter is a circuit that allows low-frequency signals to pass through while blocking high-frequency signals. It is often used to remove noise from a signal or to smooth out a signal by removing high-frequency components. A high-pass filter, on the other hand, is a