Answer Posted / sattar

TRF (tuned radio frequency) receiver is a popular type of
Am receiver as it is cheap and simplest.But it has tendency
to oscillate at higher frequency ,and its selectivity is
less and BW variation takes place during tuning.So,SHR
(super heterodyne rec) is used.
In SHR,the incoming Rf freq. is mixed with a local
oscillator freq.(LO) to generate a supersonic intermediate
frequency((IF) ) such that IF=LO-RF.This IF is independent
of RF charecteristics and hence gives uniform SELECTIVITY
and SENSITIVITY.
The RF amplifier provides image frequency rejection of SHR
amplifier and its Q-factor can be increased by using
GANGLED CAPACITORS at input and output.

Define what is the importance of valence shell and valence electrons?

1111

---

Explain why we are using the bridge rectifier in most of the circuits instead of full wave rectifier even though the output of both are same?

1025

---

In the OTA, the transconductance is controlled by A The ac supply voltage B A bias current C The input signal voltage D The manufacturing process

2051

---

Define cmrr of an opamp?

1262

---

Draw the circuits of cb, ce and cc configurations using npn transistor.

1123

---

pls what type of questions asked in interview of appsc polytechnic govt lecturers mail to kram.thulasi@gmail.com

3188

---

Define what is photodiode?

1126

---

How is the keycode calculated while interfacing a keyboard with a microprocessor?

1923

---

Explain what is an operational amplifier?

1159

---

why ,in CE configuration amp the output is 180 deg phase shift....?

2625

---

why do we use soft starters

1932

---

Explain the purpose of the package around a microprocessor silicon die?

939

---

What are the applications of multiplexer (mux)?

1232

---

How can the memory of a computer be increased?

1066

---

What is the difference between circuit switching and packet switching?

1052

---