# Recent questions

Draw energy level diagram of conductor and insulator.

List any two applications of thermionic emission.

Define intrinsic and extrinsic semiconductor.

Give any two properties of polymers.

5(4+1) ÷ 5(5) = ?

Define Superconductivity.

Give the classification of magnetic materials.

Convert –  (255)10 = (?)16 = (?)8  (157)10 = (?)BCD = (?) Excess3

If we tossed simultaneously two coins. Find the probability of exactly one tail.

Draw the block diagram of Programmable Logic Array.

State function of preset and clear in flip flop.

Define modulus of a counter. Write the numbers of flip flops required for Mod-6 counter.

Draw logic diagram of T flip-flop and give its truth table.

State the necessity of multiplexer.

Write simple example of Boolean expression for SOP and POS.

Draw the circuit diagram for AND and OR gates using diodes.

Find the area of rhombus whose diagonals are 6 cm and 9 cm.

Find the value of (sin 15o ) using compound angles.

Find the area of the triangle whose vertices are 4,3 1,4 and 2,3 .

Evaluate log3 81.

6 ÷ 2 (1+2) = ? a) 1 b) 9

Draw a circuit diagram of R.C. series circuit. Draw impedance triangle and power triangle for same circuit.

Write the procedure of converting a given current source into voltage source.

Draw sinusoidal waveform of 3 phase emf and indicate the phase sequence.

Define quality factor for parallel resonance and write its mathematical expression.

Define susceptance and admittance for parallel circuit.

Draw impedance triangle and voltage triangle for RL series circuit

Define active power and reactive power for RLC series circuit.

Draw output characteristics of common emitter [CE] configuration and explain active, saturation and cut-off regions in detail.

Identify type of BJT configuration having following features : (i) BJT configuration having the least current gain. (ii) KIT configuration called as voltage follower. (iii) BJT configuration having current gain less than one. (iv) BJT configuration suitable for impedance matching. (v) BIT configuration suitable for voltage amplification. (vi) BJT configuration having the least output impedance.

Describe the working principle of photodiode with proper diagram.

Draw the circuit diagram of bridge rectifier with π filter. Draw its input and output waveform.

List the applications of RC oscillator and crystal oscillator.

An AC supply of 230 V is applied to half wave rectifier circuit. A transformer turns ratio is 20 : 1. Find i) Output DC voltage (ii) Peak Inverse Voltage (PIV)

Describe transistor as a switch with neat sketch.

Differentiate between positive and negative feedback on the basis of . (i) overall phase shift (ii) voltage gain (iii) stability (iv) applications

Draw the block diagram of regulated DC power supply and explain the function of each block.