Code No: 310301 III-B.Tech. I Semester Supplementary Examinations June, 2003
Set No.
BASIC ELECTRONICS (Mechanical Engineering)
1
b)
2.a)
b)
Draw the diagrams giving energy band structures of : (i) an insulator (ii) a semi-conductor and (iii) a metal and explain the difference in their electrical conductivities. Define mobility and conductivity and give their dimensions.
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1.a)
Max. Marks: 80 Answer any five questions All questions carry equal marks --Define large signal current gains α and β and obtain the relationship between these two. Show the biasing voltages for a p-n-p transistor in CE mode. Draw the input and output characteristics of the same. Indicate all regions.
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Time: 3 hours
Write short notes on the following: (a) Sinusoidal Oscillator. (b) Feedback amplifier configurations.
4.a)
Draw the block diagram of a timer system. Briefly explain the constituents of industrial Timing circuits. Classify the timers according to the function and the technique used to achieve the industrial timing.
b)
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3.
Explain various steps involved in Resistance welding process. Draw the circuit diagram of asynchronous welding control system and explain.
6.a) b)
Draw the block diagram of CRO and explain the function of each block. Explain clearly how the following parameters of waveforms are measured using CRO. (i) Amplitude (ii) Frequency (iii) Phase.
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5.a) b)
Explain the principle of Induction heating. Explain skin effect phenomena in Induction heating.
8.a)
Explain the construction and working principle of electromagnetic flow meter and list out the merits & limitations. Compare AC and DC excitation methods in electromagnetic flow meter.
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7.a) b)
b)
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Code No: 310301
Set No. III-B.Tech. I Semester Supplementary Examinations June, 2003 BASIC ELECTRONICS (Mechanical Engineering)
Max. Marks: 80 Answer any five questions All questions carry equal marks ---
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Time: 3 hours
2
Derive the continuity equation and explain it. What is meant by Hall Effect? Explain with necessary diagrams.
2.a) b)
Describe the tunneling phenomenon in a tunnel diode. Draw and explain the current-voltage characteristics of a tunnel diode and indicate the negative resistance portion.
3.a) b)
Write short notes on “Frequency stability in Oscillator”. Draw the circuit of RC phase shift Oscillator using transistor. Derive an expression for frequency of Oscillation.
4.a) b)
Briefly explain how the timers are classified according to their function. Briefly explain the operation of thermal timers.
5.a)
Draw the circuit diagram of an a.c. welder circuit using primary control and secondary control and explain. Draw the schematic diagram and explain the principle of operation of Resistance welding.
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b)
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1.a) b)
What is a time base? State the need for a time base in CRO. Derive the expression for the electro-static deflection sensitivity of a cathode ray tube.
7.a) b)
Explain the principle of Dielectric heating. State and explain the various thermal losses in Dielectric heating.
8.a)
Describe the construction and working principle of Infrared pyrometer with a neat sketch. Explain how spiral type bimetallic strip is used to measure the temperature.
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6.a) b)
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b)
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Code No: 310301
Set No. III-B.Tech. I Semester Supplementary Examinations June, 2003 BASIC ELECTRONICS (Mechanical Engineering) Time: 3 hours
Max. Marks: 80
Answer any five questions All questions carry equal marks --What is meant by early effect. Explain with the necessary equations. Draw the output characteristics of p-n-p transistor in common base mode. Identify all the regions.
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1.a) b)
3
Derive the equation for current in SCR. Explain the various applications of SCR.
3.a)
Draw the circuit diagram of Wein Bridge Oscillator. Derive the conditions for frequency of oscillation. Compare LC and RC oscillators.
4.a) b) 5.a) b)
Compare and contrast the following: (i) Delay Timers (ii) Interval Timers (iii) Repeat cycle timers (iv) Reset Timer. Briefly explain the operation of electromechanical timers.
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b)
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2.a) b)
Draw the circuit and explain the operation of sequence weld timer circuit. Also draw the timing diagram. Compare single phase and three phase D.C. welding. What is Induction? Explain it and give merits of Induction heating. Give any three applications of Induction heating.
7.a) b) c)
Explain the functions of various controls on the front panel of a CRO. Write about CRO probes and their applications. Explain the theory of Dielectric heating. What are its merits and demerits?
8.a)
Describe the construction and working principle of optical pyrometer with neat sketch. How is Thermistor used in flow measurement? Explain with a necessary bridge circuit.
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6.a) b)
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b)
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Code No: 310301
Set No. III-B.Tech. I Semester Supplementary Examinations June, 2003 BASIC ELECTRONICS (Mechanical Engineering)
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1.a) b)
Max. Marks: 80 Answer any five questions All questions carry equal marks --Explain what is meant by gate hold time and gate recovery time of a SCR. How the SCR is working as a rectifier? Explain with the help of a circuit diagram and waveforms.
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Time: 3 hours
4
2.a) b)
Draw the volt-ampere characteristics of a breakdown diode and explain. Draw a simple circuit using zener diode to regulate the voltage across a load impedence.
3.a)
Draw the circuit of single stage RC coupled Amplifier and explain its principle of operation. Derive an expression for gain sensitivity of a feedback Amplifier.
4.a) b)
Briefly explain the operation of timers which are classified according to the technique used to achieve the industrial timing. Mention the classification of electronic timers.
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b)
Draw the circuit diagram of a 3-phase welder and explain its operation. Compare synchronous and non synchronous weld timers.
6.a) b)
What is dielectric heating? Explain clearly its merits and demerits. Describe about the different methods of coupling of electrodes to RF generators.
7.a) b) c)
What is the need for a time base generator in a CRO? How is magnitude and phase measured on a CRO? Explain clearly how frequency can be measured using CRO.
8.
Write short note on following: a) Capacitive transducer b) Resistive transducer c) Inductive transducer d) Photoelectric transducer.
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b) Classify the blast furnace stoves. What are the different values in the stove and · their functions? 3.a) What factors affect reducibility of iron ores? Discuss them.
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