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    3 Hours / 70 Marks: Seat No

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    Meet Todankar
    This document contains instructions and questions for an exam on electronics. It is divided into 6 main questions, with 3-4 sub-questions each. The questions cover topics such as resistors, filters, transistors, integrated circuits, power supplies, transducers, and amplifiers. Students are instructed to answer 5 out of 7 sub-questions in question 1, and 3 out of 4 sub-questions for questions 2-4. For questions 5 and 6, students must answer 2 out of 3 sub-questions. The document provides circuit diagrams, calculations, and explanations as needed.

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    3 Hours / 70 Marks: Seat No

    Uploaded by

    Meet Todankar
    41 views4 pages
    This document contains instructions and questions for an exam on electronics. It is divided into 6 main questions, with 3-4 sub-questions each. The questions cover topics such as resistors, filters, transistors, integrated circuits, power supplies, transducers, and amplifiers. Students are instructed to answer 5 out of 7 sub-questions in question 1, and 3 out of 4 sub-questions for questions 2-4. For questions 5 and 6, students must answer 2 out of 3 sub-questions. The document provides circuit diagrams, calculations, and explanations as needed.

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    This document contains instructions and questions for an exam on electronics. It is divided into 6 main questions, with 3-4 sub-questions each. The questions cover topics such as resistors, filters, transistors, integrated circuits, power supplies, transducers, and amplifiers. Students are instructed to answer 5 out of 7 sub-questions in question 1, and 3 out of 4 sub-questions for questions 2-4. For questions 5 and 6, students must answer 2 out of 3 sub-questions. The document provides circuit diagrams, calculations, and explanations as needed.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    41 views4 pages

    3 Hours / 70 Marks: Seat No

    Uploaded by

    Meet Todankar
    This document contains instructions and questions for an exam on electronics. It is divided into 6 main questions, with 3-4 sub-questions each. The questions cover topics such as resistors, filters, transistors, integrated circuits, power supplies, transducers, and amplifiers. Students are instructed to answer 5 out of 7 sub-questions in question 1, and 3 out of 4 sub-questions for questions 2-4. For questions 5 and 6, students must answer 2 out of 3 sub-questions. The document provides circuit diagrams, calculations, and explanations as needed.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    21718

    22225
    3 Hours / 70 Marks Seat No.

    Instructions : (1) All Questions are compulsory.


    (2) Answer each next main Question on a new page.
    (3) Illustrate your answers with neat sketches wherever necessary.
    (4) Figures to the right indicate full marks.
    (5) Assume suitable data, if necessary.
    (6) Use of Non-programmable Electronic Pocket Calculator is permissible.

    Marks

    1. Attempt any FIVE of the following : 10

    (a) List any four specifications of resistors.

    (b) State the need of filters in a regulated DC power supply.

    (c) Define  and  of transistor.

    (d) Draw the symbol of N-channel and P-channel enhancement type MOSFET.

    (e) List the types of signals.

    (f) Draw constructional diagram of piezoelectric transducer.

    (g) State the function of proximity sensors and photodiode.

    2. Attempt any THREE of the following : 12

    (a) State the advantages of integrated circuits over circuits with discrete components.

    (b) Define the following terms with respect to rectifier :

    (i) Ripple factor (ii) Rectification efficiency ()

    (iii) Transformer Utilization Factor (TUF) (iv) Peak Inverse Voltage (PIV)

    [1 of 4] P.T.O.
    22225 [2 of 4]
    (c) Draw construction of LED and explain working principle.

    (d) Compare CB, CE and CC configuration on the basis of :

    (i) Input impedance (ii) Output impedance

    (iii) Current gain (iv) Application

    3. Attempt any THREE of the following : 12

    (a) Draw and explain the construction of N-channel JFET.

    (b) State any four selection criteria for transducers.

    (c) Determine the value of resistance with following colour code :

    (i) Red, Red, Orange, Gold (ii) Brown, Black, Black, Silver

    (d) Explain the concept of DC load line and operating point for biasing circuit.

    4. Attempt any THREE of the following : 12

    (a) Explain :

    (i) Seebeck effect (ii) Peltier effect

    (b) Draw the basic block diagram of regulated DC power supply. Explain the
    function of each block.

    (c) Describe the working of transistor as a switch with circuit diagram.

    (d) A JFET has a drain current of 5 mA. If IDSS = 10 mA and VGS (OFF) = –6V. Find
    the value of

    (i) VGS (ii) VP

    (e) Compare P-N junction diode and zener diode on the basis of

    (i) Symbol (ii) Direction of conduction

    (iii) Reverse breakdown (iv) Application


    22225 [3 of 4]
    5. Attempt any TWO of the following : 12
    (a) Calculate peak-to-peak amplitude, frequency and wavelength of waveforms
    shown in Fig. 1.

    Fig. 1
    (b) In CE configuration, if  = 100, leakage current ICEO = 150 A. If the base

    current is 0.2 mA, calculate the value of IC, IE and .

    (c) Identify the circuit shown in Fig. 2 and explain working with input-output
    waveforms for a sinusoidal input.

    Fig. 2

    6. Attempt any TWO of the following : 12


    (a) The following readings were obtained experiment from JFET.
    VGS 0V 0V –0.2 V
    VDS 7V 15 V 15 V
    ID 10 mA 10.25 mA 9.65 mA
    Determine :
    (i) AC drain resistance
    (ii) Transconductance
    (iii) Amplification factor
    P.T.O.
    22225 [4 of 4]
    (b) Observe the given frequency response of RC coupled amplifier in Fig. 3
    Calculate :
    (i) Lower cut-off frequency (FL)

    (ii) Higher cut-off frequency (FH)

    (iii) Bandwidth (BW)

    Fig. 3
    (c) Identify active and passive transducer from the following transducers :
    (i) Capacitive transducer
    (ii) Photovoltic cells
    (iii) Piezoelectric transducer
    (iv) Strain gauge
    (v) Thermocouple
    (vi) Thermisters

    _______________

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