Basic electronics
Previous year question paper with solutions for Basic electronics Dec-2011
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Question paper 1
SECTION-A
Q1. Do as directed.
a. N-type semiconductors are formed by adding ….… impurities to a pure semiconductor.
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b. Efficiency of half wave rectifier is ……………………..
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c. Center-Tap transformer is used in …………. Wave rectifier.
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d. Filter circuits are used to reduce ……………….
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e. The value of knee voltage for silicon diode is ………………. Volt.
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f. Zener diode is made to operate in ………. Region.
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g. In BJT, leakage current mainly depends on ……………………
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h. The point of intersection of dc and ac load line is called ……………..
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i. A.C. load line of a transistor is steeper than its D.C. load line. (T/F)
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j. The best biasing method is achieved by adopting …………… biasing circuit.
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k. JFET stands for ……………….
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l. MOSFET is a …………….. Controlled device.
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m. The emitter and collector regions of BJT is …………………… and ……………….. Doped.
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n. Free electrons exists in ………… band.
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o. When both the junctions of a transistor are forward biased, it is said to be in ……… region.
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SECTION-B
Q2. Attempt any five questions.
i. Explain with suitable diagram Intrinsic and Extrinsic semiconductors.
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ii. What is Zener diode? Draw its symbol and explain its characteristics.
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iii. Explain the working of half wave rectifier.
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iv. Explain the working of NPN transistor.
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v. Explain the difference between FET and BJT.
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vi. What do you mean by h parameters of transistors?
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vii. In what way the temperature variations affect the operating point of a transistor?
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viii. Explain the phase reversal of output voltage with respect to input voltage in an amplifier.
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SECTION-C
Q3. Attempt any three questions.
a. Explain conductors, insulators and semiconductors on the basis of their energy band diagram
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b. Draw circuit of a full wave bridge rectifier and explain its working. Draw the output waveform.
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c. Explain PN junction and draw the V-I characteristics of PN junction.
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d. Explain the input and output characteristics of CE configuration. Derive the relation between α and β.
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e. Write a short note on (any two)
i. Light Emitting Diode
ii. Drift and Diffusion current
iii. Filter circuits.
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