ELECTRONIC DESIGN & PRACTICE (ORAL QUESTIONS)

ELECTRONIC DESIGN & PRACTICE  (ORAL QUESTIONS)  TE  E&TC

Design of linear regulated power supply

1)    Draw the basic block diagram of a regulated power supply.

2)    When is a power supply ‘regulated’?

3)    What are the types of power supply?

4)    What are the types of linear power supply?

5)    Why is it called a ‘linear’ power supply?

6)    What are the specifications of the power supply that u have designed?

7)    On what basis is the regulator selected?

8)    Which are the commonly used regulator IC’s for fixed(5V, 12V) and adjustable supplies(eg. 2V-12V)?

9)    Explain the design and working of the regulator.

10) Which diode have u used in the rectifier circuit? Explain the working.

11) Which type of transformer has been used in the design?

12) What are the types of transformers?

13) Draw and explain the working of Overvoltage protection circuit.

14) Why is the Zener diode used in the design of protection circuit?

15) What is the significance of the fuse used in the protection circuit?

16) Draw and explain the current boosting circuit.

17) What is the need for such a circuit?

18) Explain the short circuit protection circuit. What is it used to protect?

19) Explain the input side protection circuit.

20) Why do we need protection at the input side?

21) How do u design the display circuit?

22) What is the range of the display circuit you used?

23) Which IC has been used in the design of display?

24) What is the difference between ‘dual tracking’ and ‘dual output’?

25) How do you decide if your circuit needs a heat sink and design the heat sink?

26) What are electrolytic capacitors?

Note:  Study of all the IC’s used in the overall design must be studied from the datasheets for voltage and current specification details.

Design of audio amplifier system

1)    State the specifications of the audio system u want to design.(output power,bandwidth,SNR,speaker impedance,frequency response etc)

2)    State the characteristics of an audio system(gain,bandwidth etc)

3)    Draw the detailed block diagram of the audio amplifier system.

4)    What are the inputs to the amplifier?(MIC,tape,radio)

5)    State the parameters for selection of a MIC.

6)    For which input device is the pre amplifier required & which one needs an attenuator?

7)    What is the function of the mixer circuit?

8)    What type of amplifier does a mixer circuit consist of?(summing amplifier)

9)    Design mixer circuit and state all the formulae that have been used.

10)  What does the graphic equalizer circuit do?

11)  Which IC has been used as the graphic equalizer?

12)  How can cascading be done to increase the number of channels in the graphic equalizer?(refer datasheet )

13)  Design a graphic equalizer circuit using IC 741.

14)  What is bass and treble?

15)  Why is the driver circuit required?

16)  Which power amplifier has been used?

17)  Show calculations for the power supply needed to drive all the IC’s.

18)  Why is the crossover network required?

19)  What is the output to the audio amplifier?

20)  How are the different outputs isolated on the basis of frequency range?

21)  Which IC is used in the bar graph display?

22)  State other applications of the display driver.

23)  What is the type of display(common anode/common cathode)?

24)  What is the impedance of the speakers?

Design of  a Data Acquisition System

1)    State the specifications of the data acquisition system(DAS) u have designed.

2)    Draw the complete block diagram of a DAS.

3)    What is the input to the DAS?(humidity/temperature/pressure)

4)    What are the objectives of a DAS?

5)    Which sensor have u used?

6)    How is the sensor selected?

7)    How is the signal conditioning circuit designed?

8)    On what basis is the microcontroller selected?

9)    State the following information about the microcontroller: i) program memory  ii)data memory  iii)clock speed  iv)i/o ports  v)interrupts  vi) data bus size

10) How is the ADC selected?

11) What are the types of ADC?

12) Why is an optocoupler used?

13)  Why is the keyboard used?

14) What are the different keys on the keyboard?

15) What is meant by keyboard debouncing?

16) Which type of LCD has been used?

17) Why is MAX 232 used?

18) Which alarms are used?

19) Which devices are connected to the different ports of the microcontroller?

20) Design the power supply of the microcontroller.

21) What are features of the microcontroller?(timers,watchdog timer,EEPROM)

22) Which display has been used?

Design of State Machines

1)    What are the different steps in the design of a state machine?

2)    What is the difference between ASM & FSM?

3)    What are the types of state machines?

4)    State the difference between Moore and Mealy models?

5)    Which model have you used in the design?

6)    What is a flipflop?

7)    Write down the excitation, truth table for JK,SR,D and T flipflops.

8)    Which flipflop is mostly preferred? Why?

9)    Draw a flowchart and explain the working of an ASM model.

Explain steps in the design of FSM model.