Goa Board Class 12 Question Paper Mar 2018 Industrial Electronics _ Instrumentation

*V334* 2018 VI 13 1430 Seat No. : Time : 2 Hours INDUSTRIAL ELECTRONICS AND INSTRUMENTATION Subject Code " ! ! 8 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : 1) Answer each question on a fresh page. 2) Write the no. of question and sub. question clearly. 3) All questions are compulsory. 4) Figure to the right indicate full marks. 5) Draw the diagram wherever necessary. 1. A) Fill in the blanks : (1×2=2) i) The percentage change in output voltage with respect to change in line voltage is ______________ ii) Another name of Permanent Magnet Moving Coil (PMMC) movement is _____ B) Answer the following : (3×2=6) i) Draw the block diagram of CRO and explain the function of CRT and power supply in it. ii) With the help of neat diagram, explain working of fan regulator circuit constructed using diac an traic. C) Answer the following : (2×1=2) i) Explain the AC voltage measurement using CRO. 2. A) Define the following : (1×2=2) i) Motor. ii) Electronic timers. B) Answer the following : (3×2=6) i) State the function of pin No. 2, 5, and 7 in Timer IC NE 555. ii) State any three points of comparison between LED and LCD. C) Answer the following : (2×1=2) i) State any four advantages of electronic timers over mechanical timers. V-334 -1- P.T.O.

*V334* 3. A) Fill in the blanks : (1×2=2) i) Frequency range of AF signal generator is ______________ ii) An electric instrument that can be used to measure ac current without connecting it in the circuit is called ______________ B) Answer the following : (3×1=3) i) With a neat diagram, explain the working of capacitive transducer. C) Answer the following : (5×1=5) i) With the help of block diagram, explain working of ECG and state the use of the same. OR ii) With the help of block diagram, explain working of Metal detector and state the use of the same. 4. A) Answer the following in one word/sentence : (1×2=2) i) State the use of +ve voltage regulator IC LM7815. ii) What technique is used to extend the range of voltmeter ? B) Answer the following : (3×1=3) i) With the help of diagram, explain the working of piezo electric transducer. C) Answer the following : (5×1=5) i) With the help of neat labeled diagram, explain the construction of DC motor. OR ii) With the help of neat labeled diagram, explain the working of two point starter. 5. Answer the following : (2×5=10) i) Draw the construction diagram of photo transistor and state any two applications of it. ii) With the help of neat dig. explain Hall effect. iii) State one point of difference between oscillator and signal generator. iv) With the help of diagram, explain range extension of an ammeter. v) With the help of block diagram, explain working of converter. ___________ V-334 -2-