Goa Board Class 12 Question Paper June 2018 Electronic and Electrical Measurments

*V341* 2018 VI 12 1430 Seat No. : Time : 2 Hours ELECTRONIC AND ELECTRICAL MEASUREMENTS Subject Code ! " 8 Total No. of Questions : 5 (Printed Pages : 2) Maximum Marks : 50 INSTRUCTIONS : i) Answer each question on a fresh page. ii) Write the number of each question and sub-question clearly. iii) All questions are compulsory. iv) Figures to the right indicate full marks. 1. A) Fill in the blanks : [2] i) In induction type wattmeter, the coil which carries a load current is known as _______ ii) Clip-on meter is also called ________ B) Answer the following : [6] i) Explain the working of function generator with a neat block diagram. ii) Explain the power factor meter with a neat diagram. C) Answer the following : [2] State two advantages of spring control method for providing controlling torque. 2. A) Define the following : [2] i) Seebeck effect ii) Sensitivity of PMMC instrument. B) Answer the following : [6] i) Draw a neat block diagram of CRO. Name any 2 probes used in a CRO. ii) With a neat diagram of Wheatstone’s bridge, derive an expression for unknown resistance. V-341 -1- P.T.O.

*V341* C) Answer the following : [2] State any four advantages of digital multimeter over analog multimeter. 3. A) Fill in the blanks : [2] i) Megger is a combination of generator and _________ ii) The instrument used to measure angular speed is ________ B) Answer the following : [3] Explain the Repulsion type moving iron instrument with a neat diagram. C) Answer any one of the following in detail : [5] i) Explain the cup-type Anemometer with a neat diagram. State the use of Anemometer instrument. OR ii) Explain the output power meter with a neat block diagram. State the use of output power meter. 4. A) Answer the following : [2] i) Name any 2 asymmetrical crystalline materials used in Piezoelectric transducer. ii) Name the circuit that converts the unknown frequency into pulses in a digital frequency meter. B) Answer the following : [3] Draw a neat diagram of DC tachometer generator. State any one advantage. C) Answer any one of the following in detail : [5] i) Explain the working of LVDT with a neat diagram. OR ii) Explain the capacitive transducer with a neat diagram. State one advantage. 5. Answer the following : [10] i) Distinguish between single phase energymeter and single phase wattmeter. (4 points) ii) State and explain any two applications of CRO. iii) Explain the calibration of DC voltmeter using potentiometer with a neat diagram. iv) State any four uses of Megger. v) Define pH value of a solution. Write the pH values for acidic and alkaline solution. ________________ V-341 -2-