A rod has a proper length of . An observer measures its length as . Calculate the speed of the rod.

Design an astable multivibrator using IC 555 to generate the square wave of 20 kHz frequency.

Refer to Fig. 15.4 in your study material showing the geometry of the electron beam deflection in a CRT. In this CRT the length of deflection plates (L) is  and the distance between screen and centre of the deflection plates (R) is . Accelerating  voltage applied to the anode is 1200 V and applied deflection voltage is 80 V. If the deflection suffered by the electron beam at the edge of the deflection plate (h) is 1 mm, calculate the plate separation (s). Determine the deflection observed on the CRT screen (y) and calculate the deflection sensitivity.

Design a 2-channel op-amp based circuit to give following output relation:

Design and draw a circuit using an op-amp to get  at output for input less than  and  at output for input greater than . 

 You want to amplify a triangular wave signal of  amplitude and  frequency. Which characteristic of op-amp will be significant in this case? What is its minimum value? 

Design and draw shunt voltage regulator using a zener diode to provide  output with maximum load current of . Assume that the input unregulated dc voltage is  and the minimum zener current is . 

The turns ratio of a transformer used in half wave rectifier is 30:1. The primary is connected to the power mains: . If the diode resistance in forward bias is  and the load resistance, R_L is , determine
i) the peak value, the dc value and the rms value of current;
ii) the ripple factor

raw the circuit of a Colpitts oscillator. Calculate its frequency of oscillation if value of both the capacitors is  and inductor is .

Why LC oscillators are preferred over RC oscillators to generate high frequencies? Why 2-stage amplifier is required in Wien bridge oscillator in contrast to a single stage amplifier in the phase shift oscillator? 

What are the advantages of resistance-capacitance (RC) coupling between the two stages of a cascade amplifier?

How class B amplifier is more efficient than class A amplifier? What will be the effect on the output of a push-pull amplifier if unmatched transistors are used? 

In the universal biasing of a transistor, which resistor acts as a feedback element? How does it provide stability to the circuit? 

Draw the circuit of 2's complement binary adder-subtractor and using it explain the addition of binary equivalent of decimal number 9 and binary equivalent of decimal number 4 .

Using the Boolean laws and theorems prove the following identities: 
i. 
ii. 
iii. 
iv. 
v. 

Write the truth table of a full adder and obtain the expressions of its Sum and Carry using the SOP method. 

Obtain the expression for the output of the following logic circuit. Write its truth table. Which gate is represented by this circuit? 

Convert 3960₁₀ (decimal) into its hexadecimal equivalent and then divide it by hexadecimal number 08₁₆. Express the result in octal equivalent. 

h-parameters of a single stage CE amplifier are given as  and . Calculate A_i, A_v, Z_in and Z_out with  and . 

Obtain the Q- point of a bipolar junction transistor in CE configuration with  and .