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    DEPT Lab Question2

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    Mostofa Al Murad
    The document describes a lab exam for a digital electronics and pulse techniques course. It provides details of the exam such as the student name, section, and marks obtained. It then lists 20 questions that were asked in the viva voce portion of the exam covering topics like op-amp terminals, oscillator functions, timer IC terminals, and applications of different electronic components. It also includes 4 circuit analysis and design questions to be answered in the lab portion covering topics like adder circuits, differentiators, astable multivibrators, and inverting amplifiers.

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    © All Rights Reserved
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    DEPT Lab Question2

    Uploaded by

    Mostofa Al Murad
    12 views10 pages
    The document describes a lab exam for a digital electronics and pulse techniques course. It provides details of the exam such as the student name, section, and marks obtained. It then lists 20 questions that were asked in the viva voce portion of the exam covering topics like op-amp terminals, oscillator functions, timer IC terminals, and applications of different electronic components. It also includes 4 circuit analysis and design questions to be answered in the lab portion covering topics like adder circuits, differentiators, astable multivibrators, and inverting amplifiers.

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    Lab paper question

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    The document describes a lab exam for a digital electronics and pulse techniques course. It provides details of the exam such as the student name, section, and marks obtained. It then lists 20 questions that were asked in the viva voce portion of the exam covering topics like op-amp terminals, oscillator functions, timer IC terminals, and applications of different electronic components. It also includes 4 circuit analysis and design questions to be answered in the lab portion covering topics like adder circuits, differentiators, astable multivibrators, and inverting amplifiers.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    12 views10 pages

    DEPT Lab Question2

    Uploaded by

    Mostofa Al Murad
    The document describes a lab exam for a digital electronics and pulse techniques course. It provides details of the exam such as the student name, section, and marks obtained. It then lists 20 questions that were asked in the viva voce portion of the exam covering topics like op-amp terminals, oscillator functions, timer IC terminals, and applications of different electronic components. It also includes 4 circuit analysis and design questions to be answered in the lab portion covering topics like adder circuits, differentiators, astable multivibrators, and inverting amplifiers.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 10

    Digital Electronics and Pulse Technique Lab

    Marks 60

    Time: 1 Hour

    Student Name: Mostofa Al Murad


    ID:CSE1801013019

    Section: 14A(Hajiganj)

    Marks obtained:

    Viva questions (20 Marks)

    1. What are the various terminals of op-amp 741 IC?


    The IC 741 is a small chip. It comprises eight pins. 2, 3 and 6 numbered pins are
    most significant.
    Pin 2 is inverting terminal
    Pin 3 is no-ninverting terminal
    Pin 6 is operating terminal
    2. What is the operating voltage range of IC 741?
    +/-15 volts
    3. What would be the output shape for a “Square wave” input of an integrator?
    CR integrator
    4. What would be the output shape for a “Sine wave” input of a differentiator?
    Ans: The output of an integrator is out of phase by 180o with respect to the input, since the input is
    applied to the inverting input terminal of the op-amp. Integrating circuits are generally used to generate
    ramp wave from square wave input.
    5. What is the pulse width of Monostable multivibrator?
    This monostable pulse generator IC can be configured to produce an output pulse on either a rising-
    edge trigger pulse or a falling-edge trigger pulse. The 74LS121 can produce pulse widths from about
    10ns to about 10ms width a maximum timing resistor of 40kΩ and a maximum timing capacitor of
    1000uF.
    6. Write down some of the applications of Monostable multivibrator?
    Ans: The monostable multivibrator is used as delay and timing circuits. It is also used for temporary
    memories. It is often used to trigger another pulse generator. It is used for regenerating old and worn out
    pulses.
    7. State the function of Oscillator.
    Ans: An electronic oscillator is an electronic circuit that produces a periodic,
    oscillating electronic signal, often a sine wave or a square wave.
    8. What is the pulse width of Astable multivibrator??
    Ans: 1:1
    9. Define Hysteresis?
    Ans: the phenomenon in which the value of a physical property lags behind changes in the effect
    causing it, as for instance when magnetic induction lags behind the magnetizing force.
    10. Write down the uses of capacitor.
    Ans: Energy storage
    Pulsed power and weapons
    Power conditioning
    Power factor correction
    Suppression and coupling
    Motor starters
    Sensing
    Oscillators
    Hazards and safety
    References

    11. What is resistor?


    Ans: A resistor is an electrical component that limits or regulates the flow of electrical current in an
    electronic circuit
    12. Write down some application of diode?
    Ans:
    1. Rectifiers
    2. Clipper Circuits
    3. Clamping Circuits
    4. Reverse Current Protection Circuits
    5. In Logic Gates
    6. Voltage Multipliers

    13. What is the main difference between clipper and clamper?


    The major difference between clipper and clamper is that clipper is a
    limiting circuit which limits the output voltage while clamper is a circuit which
    shifts the DC level of output voltage. The clipper and clamper circuits are
    exactly opposite to each other regarding their working principle.
    14. Write an application of ADC and DAC
    Digital to Analog Converter (DAC) and Its Applications. ... For example, take
    the below DSP illustration, an ADC converts the analog data collected by audio
    input equipment such as a microphone (sensor), into a digital signal that can be
    processed by a computer. The computer may add sound effects.
    15: What are the various terminals of 555 timer IC?
    Ans: GND Pin. Pin-1 is a GND pin which is used to supply a zero voltage to the IC.
    Trigger Pin. Pin-2 is a trigger pin which is used to convert the FF from set to RST (reset). ...

    Output Pin. Pin-3 is an output pin.

    Reset Pin. ...


    Control Voltage Pin. ...

    Threshold Pin. ...

    Discharge Pin. ...

    Supply Terminal.

    16. How to define the Amplitude of a signal.


    Ans: Amplitude is a measure of the intensity, loudness, power, strength, or
    volume level of a signal. In an electrical circuit operating on alternating current
    (ac), amplitude is measured as the Voltage (V) level and is expressed as +V and
    V, depending on the direction of the current. See also sine wav Amplitude is a
    measure of the intensity, loudness, power, strength, or volume level of a signal.
    In an electrical circuit operating on alternating current (ac), amplitude is
    measured as the Voltage (V) level and is expressed as +V and V, depending on
    the direction of the current. See also sine wave.
    17. Which electronic device is used to measure the voltage and frequency of a signal.
    Ans:
    Ammeter (Ampermeter) Measures current

    Measures the
    Capacitance meter capacitance of a
    component

    Measures current
    Current clamp without physical
    connection

    Applies swept signals to


    Curve tracer a device and allows
    display of the response

    Measures the power


    Cos Phi Meter
    factor

    18. What is time constant?


    Ans: a time which represents the speed with which a particular system can respond to change, typically
    equal to the time taken for a specified parameter to vary by a factor of 1− 1/ e (approximately 0.6321).
    19. How to calculate the duty cycle of a relaxation oscillator?
    Ans: Charge the capacitor faster (or slower) than you discharge it.
    For example, replace R1 with this:
    simulate this circuit – Schematic created using CircuitLab
    Now, when discharging (Vout low), D1 conducts putting R1 and R2 in parallel. This will
    reduce the period, but also increase the duty cycle (by decreasing the low period). If you
    wanted to reduce teh duty cycle, reverse the diode.
    20. Tell the name of some switching devices.
    Ans:
    • Mechanical Switches. Single Pole Single Throw Switch (SPST) Single Pole Double
    Throw Switch (SPDT) Double Pole Single Throw Switch (DPST) Double Pole Double
    Throw Switch (DPDT) Push Button Switch. Toggle Switch. Limit Switch. Float Switches. ...
    • Electronic Switches. Bipolar Transistors. Power Diode. MOSFET. IGBT. SCR. TRIAC. DIAC.

    Lab Question (40 Marks)


    Question 01: See the circuit

    Write down:

    a) The Name of the circuit.

    b) Equipment’s required to design in lab.

    c) draw the Corresponding input output wave shape.

    Ans: a) Adder

    b)
    C)

    Question 02: Consider the circuit.

    Write down

    a) Name of the circuit.

    b) Apparatuses required to design in lab.

    c) Corresponding input and output wave shape:

    Ans:

    a) Differentiator
    b)

    Project board – 1pcs

    Opamp (741) – 1pcs

    Resistor (159Rodh,1.5k.rodh,1krodh) – each one

    Capacitor (0.01uf) – 1 pcs


    Signal genaretor – 1unit

    Oscilloscope – 1unit

    Dc power supply – 2unit

    Multimeter – 1unit

    Chords & wire - lot

    C)
    Question 03: 555 IC timer circuit acts as an Astable multivibrator. A simple OPAMP Astable
    multivibrator is also called square wave generator and free running oscillator. The principle for the
    generation of square wave output is to force an OP-AMP to operate in the saturation region β=R2/
    (R1+R2) of the output is feedback to input. The output is also feedback to the negative input terminal after
    integrating by means of a RC LPF whenever the negative input just exceeds Vref, switching takes place
    resulting in a square wave output. In Astable multivibrator both states are quasi stable states. When the
    output is +Vsat, the capacitor is now starts charging towards +Vsat through resistance R the voltage is
    held at +βVsat. This condition continuous until the charge on C just exceed Vsat. Then the capacitor
    begins to dis charge towards– Vsat. Then the capacitor charges more and more negatively until its voltage
    just– βVsat.
    Design the circuit of the timer 555 IC as an Astable multivibrator with corresponding input output
    waveforms.
    Ans:
    Question 04: See the input and output wave form or an inverting Op-Amp circuit.

    a) Design an Inverting amplifier using 741 Op-amp.


    b) Write down the apparatus required to design the circuit in lab.
    c) How to calculate its voltage gain?

    a) Ans :

    b)

    C)
    For example, if an amplifier takes in an AC voltage signal measuring 2 volts RMS
    and outputs an AC voltage of 30 volts RMS, it has an AC voltage gain of 30
    divided by 2, or 15: Correspondingly, if we know the gain of

    an amplifier and the magnitude of the input signal, we can calculate


    the magnitude of the output.

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