Industrial Electronics - Dec 2013
Mechanical Engineering (Semester 4)
TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.
Answer any four of the following:-
1 (a) Explain SCR as rectifier and give significance of freewheeling diode.(5 marks) 1 (b) What are the open loop configurations of OPAMP? Explain any one with circuit diagram.(5 marks) 1 (c) What are the advantages of electronic control of a motor?(5 marks) 1 (d) What do you mean by cycloconverter? Explain reasons of limited applications of cycloconverters.(5 marks) 1 (e) A SCR circuit has 20 A load current 400 V d.c. voltage and 190�s turn off time of the device. Determine the value of the commutating capacitor.(5 marks) 2 (a) Explain construction, working and applications of TRIAC.(10 marks) 2 (b) Explain with the help of block diagrams armature and field control of a DC shunt motor.(10 marks) 3 (a) What do you mean by commutation of SCR? Classify and explain all commutation circuits of SCR.(10 marks) 3 (b) Explain in detail working of a dual converter circuit.(10 marks) 4 (a) Explain in detail the overload protection of DC motor.(10 marks) 4 (b) Explain improved series inverter circuit.(10 marks) 5 (a) Explain 555 timer as monostable multivibrator with waveforms.(10 marks) 5 (b) Derive the expression for OPAMP as an integrator.(10 marks) 6 (a) Realize all basic gates with NOR gate.(10 marks) 6 (b) What are the advantages of digital system? Compare different digital expression reduction technique and explain the effective method.(10 marks) 7 (a) Explain the architecture of 8085 Microprocessor.(10 marks) 7 (b) Explain in detail interrupts of 8085 microprocessor.(10 marks)