Help?
PLEASE MATCH YOUR ASSIGNMENT QUESTIONS ACCORDING TO YOUR SESSION
IGNOU BPHET-143 (January 2025 – December 2025) Assignment Questions
c) With the help of a suitable diagram, explain the subtraction of binary equivalent of decimal number 5 from binary equivalent of decimal number 7 using a 2’s complement binary adder-sub tractor.
PART B
5. a) Why is a Class A amplifier preferred over Class C amplifier in spite of being less efficient?
b) Why is it necessary to use matched pair of transistors in a push-pull amplifier?
c) An amplifier has maximum voltage gain of 500. Express it in dB scale. Calculate the gain at the cut-off frequencies on dB scale.
d) What are the advantages of transformer coupling between the two stages of a cascade amplifier?
6. a) State the Barkhausen criterion for sustained oscillations. Explain the operation of Colpitt Oscillator. For a Colpitt oscillator with 10 MHz frequency determine the equivalent capacitance, C forming tank circuit with 0.1 mH inductor.
b) In a voltage regulator circuit, the output voltage under no load condition is 12V while under full load it is 11.8V. Over the full range of input voltage variation the nominal voltage output of 12V varies by 50 mV. Calculate percentage load and line regulation.
c) Design and draw a circuit of series pass voltage regulator to provide 25 V outputvoltage and 160 mA maximum load current using a silicon n-p-n transistor with =80. Assume the input unregulated voltage to be 30 V and minimum zener diode current to be 10 mA. Specify the voltage and power rating of zener diode as well as value and power rating of the resistor used.
7. a) Draw a circuit of a non-inverting amplifier with gain 1 using op-amp. Draw the output voltage curve of this circuit for a step input of 5V amplitude and 50 kHz frequency, if the slew rate of the op-amp is 0.5 V/s. (Use proper scale on the time axis to illustrate the effect of slew rate).
b) Design and draw the circuit of a three channel op-amp adder with channel gains of 5, 10 and 15 respectively.
c) Explain the terms CMRR and input offset voltage in case of op-amp.
8. a) State the main subsystems of a CRO and explain their functions.
b) Design an astable multivibrator using IC 555 timer to generate a rectangular wave of 60% duty cycle at 10 kHz frequency.
IGNOU BPHET-143 (January 2024 – December 2024) Assignment Questions
IGNOU BPHET-143 (January 2024 – December 2024) Assignment Questions
