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# Electronics - Questions

CBSE 12th standard Questions

Derive an expression for total power carried by an AM wave
(class: 12th Std )    Electronics

What is full adder? Construct the full adder using half adders. Write its output, when the inputs are A=1,B=1,C=1
(class: 12th Std )    Electronics

Derive an expression for the output impedance of a feedback amplifier
(class: 12th Std )    Electronics

With help of re model derive an expression for input impedance and voltage gain for a single stage CE amplifier.
(class: 12th Std )    Electronics

Draw the pin diagram of IC7402
(class: 12th Std )    Electronics

Draw the frequency spectrum of AM wave.
(class: 12th Std )    Electronics

Define sequential logic circuit.
(class: 12th Std )    Electronics

Write the truth table of clocked SR flip flop.
(class: 12th Std )    Electronics

Define frequency modulation.
(class: 12th Std )    Electronics

Give an expression for the gain when positive feedback is applied to an amplifier.
(class: 12th Std )    Electronics

What is the effect of negative feedback on the band width of an amplifier?
(class: 12th Std )    Electronics

How do you bias a transistor to operate in active region?
(class: 12th Std )    Electronics

Write the relationship between the three currents in the transistors.
(class: 12th Std )    Electronics

With a help of circuit diagram explain switching action of a transistor,
(class: 12th Std )    Electronics

Write the neat diagram of two stages RC coupled amplifier and explain its working, also mention its applications.
(class: 12th Std )    Electronics

Explain the construction, working and applications of photo transistor.
(class: 12th Std )    Electronics

Give a comparison of CE, CB and CC amplifier.
(class: 12th Std )    Electronics

Give the classifications of transistor amplifier.
(class: 12th Std )    Electronics

With a circuit diagram, explain the operation of a CC amplifierWhy is it preferred as impedance matching circuit?
(class: 12th Std )    Electronics

(class: 12th Std )    Electronics

What is an opt coupler? Write its circuit construction.
(class: 12th Std )    Electronics

Explain the frequency response of a single CE amplifier
(class: 12th Std )    Electronics

Explain the function of coupling capacitors and emitter by pass capacitor in CE Amplifier.
(class: 12th Std )    Electronics

Mention the advantages of an RC coupled amplifier.
(class: 12th Std )    Electronics

Draw the characteristics of phototransistor.
(class: 12th Std )    Electronics

ACE –Amplifier has an output resistance of 5 KO and voltage gain of 100. If the input signal voltage is 5 m V: find the Base current given ß of transistor is 50 .
(class: 12th Std )    Electronics

Mention the steps involved in writing a.c equivalent circuit.
(class: 12th Std )    Electronics

Why CB amplifier is seldom used in AF amplifier
(class: 12th Std )    Electronics

Define Bandwidth of an amplifier
(class: 12th Std )    Electronics

Name any two advantages of expressing gain in decibel
(class: 12th Std )    Electronics