Industrial Electronics (EX-504 (A)) - Important Questions

Write short notes on Switch Mode Power Supply, Power MOSFET and Wien Bridge Oscillator (any two).

Discuss the advantages and disadvantages of full-wave rectifiers in power supply applications.

Explain the operation of a voltage regulator (Zener diode voltage regulator) with a neat sketch.

Draw the block diagram and explain the operation of switched mode voltage regulator / SMPS.

Draw the block diagram of on-line uninterrupted power supply and explain the function of each block.

Differentiate between series and shunt type voltage regulators.

Explain how a full bridge regulator is derived from a buck regulator.

Solve a numerical problem on a buck regulator to find inductor value and related quantities given input voltage, output voltage, current, frequency and ripple.

Draw the V-I characteristics of an SCR and mark the holding current and latching current.

Discuss operation of single-phase half-wave rectifier with RE load and derive average output voltage.

Discuss the various turn-on and turn-off methods of an SCR circuit.

Draw and explain the static V-I characteristics and different modes of operation of an SCR.

Explain overcurrent and overvoltage protection circuits for SCR with operation and sketches

Discuss the two-transistor model of an SCR and derive the expression for anode current in terms of current gains.

Discuss operation of single-phase full-wave rectifier with RE load and derive average output voltage.

Explain the various causes of damage to SCR in detail

Describe electronic crowbar protection for power transistor against overcurrent

What are the different types of commutation methods? Explain in detail with neat sketches.

Explain principle of operation, transistor model, features and V-I characteristics of IGBT

Applications of MOSFET, IGBT and SCR

Explain principle of operation and transfer, output and switching characteristics of power MOSFET

Explain / justify power losses in semiconductor devices

Discuss the applications of operational amplifiers in electronic circuits.

Describe how an OP-AMP can be used as a function generator.

Explain ideal and practical characteristics of an OP-AMP and define parameters such as CMRR, SVRR/PSRR, slew rate and gain.

Explain the working principle of relaxation oscillator, window comparator and Wien bridge oscillator.

Explain the inverting and non-inverting modes/configurations of an OP-AMP.

Explain how an operational amplifier works as a comparator.

Explain the concept of low-pass filters using OP-AMP.

Explain the functional block diagram of a PLC and its use with microprocessor.

Explain the ladder logic programming language used in PLCs with basic programming examples and how ladder diagrams represent control logic.

Compare PLCs with conventional relay controllers, advantages and disadvantages, including functions of PLC input and output modules.

Explain the functions and applications of PLCs in industrial automation.

Explain any three standard PLC communication protocols.

Explain program mode, run mode and test mode in PLC.

Explain how PLC interfaces with power electronics control to make a modern automated system.

Write short notes on any two of the following :

What do you mean by active power line condition? Explain by drawing appropriate diagram.