JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III BASIC ELECTRONICS Previous Question Paper (July/August - 2023 - R13)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
When a diode can be acts as a rectifier?
Answer
A diode acts as a rectifier when it is operated in its non-linear region, allowing current to flow in one direction (forward bias) while blocking it in the opposite direction (reverse bias), thereby converting alternating current (AC) into pulsating direct current (DC).
What is forward bias and reverse bias conditions of a diode?
Answer
Forward bias occurs when the positive terminal of an external voltage source is connected to the p-type region and the negative terminal to the n-type region, reducing the potential barrier and allowing current to flow. Reverse bias occurs when the positive terminal is connected to the n-type region and the negative terminal to the p-type region, increasing the potential barrier and preventing current flow, except for a negligible leakage current.
If the output of a transistor amplifier is 5 V rms and the input is 100 mV rms, find voltage gain?
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What is a transistor? What are the different regions of operation of a transistor?
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Write applications of Phase Controlled Rectifiers.
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What is the need of isolation in pulse transformer in triggering circuits and give its two applications.
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How oscillators are classified?
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Negative feedback is preferred to other methods of modifying Amplifier characteristics. Why?
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What is inductive heating?
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Give the applications of ultrasonic generators.
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Part B
With appropriate circuit diagram, explain the DC load line analysis of semiconductor diode.
How diode is worked as a switch and define switched timers.
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With a neat circuit diagram and waveforms, explain the working of full wave bridge rectifier and show that its ripple factor is 0.48.
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Draw CE transistor configuration and give its input and output characteristics. Also derive the relation between current gain of CE, CB and CC configurations.
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Explain the functioning of Common Collector Configuration of BJT. State why this arrangement is also called an emitter follower circuit.
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A transistor operating in CB configuration has IC = 2.98mA, IE = 3.00 mA and ICO = 0.01 mA. What current will flow in the collector circuit for this transistor when connected in CE configuration with a base current of 30μA?
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Draw and explain the characteristics of SCR. State the effect of gate current on operation of SCR.
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Describe the control Characteristic of Single-Phase Half Wave Phase Controlled Rectifier with Resistive Load.
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What are the different methods to trigger SCR? Explain them.
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For the amplifier circuit shown below, hfe=50, hre=hoe=0, hie=1.1KΩ. (a) Identify the topology. (b) Obtain the basic amplifier circuit. (c) Calculate the voltage gain, input resistance and output resistance.
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Draw the block diagram of 4 types of feedback topologies and compare them with respect to gain, input and output resistance. Give one example for each.
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With a neat electrical circuit, explain in detail about Resistance welding.
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What is a basic timer circuit? What are the different types of timer circuits and give their applications.
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