Define the following terms : (03)
[ marks]Firing angle (b) Extinction angle (c) Conduction angle
[ marks]State two advantages and two disadvantages of Power Electronics. (04)
[ marks]Draw its static V-Icharacteristics and explain its behavior in forward (07) conduction, forward blocking and reverse blocking modes.
[ marks]Define the following terms: (1) latching current (2) holding current ( 0 3 ) (3) Circuit turn-off time.
[ marks]Draw the symbol and characteristics of UJT. (04)
[ marks]What is Snubber circuit? How elements of Snubber circuits are calculated? (07)
[ marks]Explain 1-phase dual converter drive for dc motor. (07)
[ marks]Why pulse triggering is preferred over continuous triggering? (03)
[ marks]Draw the circuit diagram of single-phase half wave controlled rectifier. (04) Also draw the waveform of output voltage with R-load with α = 60°.
[ marks]Write a short note on the current ratings and voltage ratings of thyristor. (07)
[ marks]Explain construction of Power MOSFET. (03)
[ marks]Give comparison of RC firing circuit and Rfiring circuit. (04)
[ marks]Draw the waveform of output voltage, load current of single phase semi- (07) converter consisting of RL load with contionuous conduction. Derive the equation of average output voltage.
[ marks]What is the function of freewheeling diode in Phase controlled rectifier? (03)
[ marks]Explain the two transistor analogy of the thyristor. (04)
[ marks]Draw the circuit diagram of three-phase full converter connected to RL (07) load with continuous conduction. Draw the waveforms of output voltage, output current for firing angle equal to 30°.
[ marks]What is the function of pulse transformer in triggering circuit? (03)
[ marks]Write a short note on buck-boost converter. (04)
[ marks]Explain in brief various control strategies of a chopper. (07)
[ marks]Enlist any three methods to turn-on the SCR. (03)
[ marks]Draw the output voltage waveform of three-phase half-wave controlled (04) rectifier with the R-load.
[ marks]Explain the parallel operation of thyristor. (07)
[ marks]Using relevant circuit diagram and waveforms, explain regenerative braking (03) control in DC machines using chopper circuit.
[ marks]Which are the different methods of braking DC motor? (04)
[ marks]Discuss constant H.Pand constant Torque operation of speed control of motors. (07) Specify their field of applications.
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