| EC-303 INDUSTRIAL ELECTRONICS (B.Tech 5th Semester, 2122) Time : 3 Hours Maximum Marks : 60 NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from Section B and any two questions from Section C Section-A Marks : 20 1 (a) What do you understand by Fast recovery doide ? (b) Compare bridge rectifier with centre tap FW rectifier. (c) What is close loop control ? (d) What is the function of step-up chopper? (e) Give V-I characteristics of SCR. (f) Explain free-wheeling period. (g) What is pulse width modulution ? (h) What is voltage source invertor ? (i) What is meant by latching current in SCR ? (j) How does the current rating of a triac differ from of an SCR ? Why ? Section-B Marks:5 Each 2. Explain principle of an integral cycle control of a.c. motor. 3. What is the difference between solid state control conventional speed control of d.c. motor ? Explain. 4. Explain briefly the working of single-phase half-wave converter. 5. Give constructional details of triac and its applications. 6. Describe the working principle of induction Heating. Section-C Marks : 10 Each 7. A step down d.c. to d.c. converter operates ata a fixed frequency of 100 Hz as shown in figure below; is continuous made of current conduction. The controllable switch S is conducted in the time interval Ton and the free wheeling diode D in the interval Toff. Calculate : (a) Ton and Toff (b) Average value of Ir and peak value of current ripples and (c) The average and r.m.s. value of the diode current. 8. (a) Explain with the help of a connection diagram the d.c. chopper circuit. (b) Explain with the hepl of a connection diagram the a.c. chopper circuit. 9. With the help of circuit diagram explain the working of switched mode power supply. |
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