Goa Board Class 12 Question Paper Mar 2018 Electronic And Electrical Measurements _New Pattern_

2018 III 15 1000 Seat No. :

Time : 2 Hours ELECTRONIC AND ELECTRICAL MEASUREMENTS
(New Pattern)
Subject Code


! "

8

Total No. of Questions : 5 (Printed Pages : 3) 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) The material used for shunts in DC instruments is __________
ii) pH value of acidic solution lies between __________

B) Answer the following : [6]
i) Explain working of electrodynamometer type of instrument with a neat
diagram.
ii) Draw a neat diagram of a single phase energy meter and explain its
operating principle.

C) Answer the following : [2]
i) Describe Air friction damping used in measuring instruments with a neat
diagram.

2. A) Define the following : [2]
i) pH of a solution
ii) Current sensitivity.

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B) Answer the following : [6]
i) Explain photoelectric transducer with a neat diagram.
ii) Describe working of DC tachometer generator with a neat diagram.

C) Answer the following : [2]
i) Draw neat diagram of potentiometric transducer and explain its working.

3. A) Fill in the blanks : [2]
i) The instrument that is used to measure the ac current through line
without any contact is ___________
ii) In strain gauge the unit change in resistance per unit change in length is
called ___________

B) Answer the following : [3]
i) Draw a neat block diagram of AF signal generator and explain its
working.

C) Answer any one of the following in detail : [5]
i) Explain working of output power meter with a neat labelled block diagram
and state its one application.
OR
ii) Explain working of pH meter with a neat labelled diagram.

4. A) Answer the following : [2]
i) Name the transducers that can be used to convert heat energy into
electrical energy.
ii) To which part of human body does the earth lead of ECG is connected ?

B) Answer the following : [3]
i) Explain working of megger with neat diagram.

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C) Answer any one of the following in detail [5]
i) Draw a neat block diagram of a Cathode Ray oscilloscope and explain
sweep generator.
OR
ii) Draw diagram of a CRT and explain electron gun assembly.

5. Answer the following : [10]
i) Explain Calibration of DC voltmeter with a neat diagram using potentiometer
method.
ii) Enumerate any two applications of HVBT.
iii) Draw diagram of a single phase power factor meter.
iv) Draw neat circuit diagram of a Wheatstone bridge and state its one use.
v) State any four advantages of digital multimeter over analog multimeter.

______________

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