Goa Board Class 12 Question Paper Mar 2019 Electronic and Electrical Measurements

2019 III 12 1000 Seat No.

Time : 2 Hours ELECTRONIC AND
ELECTRICAL MEASUREMENTS
Subject Code

V 3 4 1
Total No. of Questions : 5 (Printed Pages : 4) 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 instruments which are provided with pointer and scale are

called ................................... .

(ii) In a digital frequency meter, the unknown frequency is converted

into pulses using ................................... .

(B) Answer the following : 6

(i) Explain the AF signal generator with a neat block diagram.

(ii) Explain the single phase power factor meter with a neat

diagram.

(C) Answer the following : 2

(i) Draw a neat labelled diagram of single phase AC induction type

energy meter.

2. (A) Define the following : 2

(i) Multiplier

(ii) pH value of a solution.

(B) Answer the following : 6

(i) Explain the working of Electrodynamometer type of instrument

with a neat diagram.

(ii) Explain the cup-type anemometer with a neat diagram.

(C) Answer the following : 2

(i) State any four applications of thermistor.

3. (A) Fill in the blanks : 2

(i) The torque responsible for obtaining quick readings in

measuring instruments is .................................. .

(ii) The LCR bridge is also known as .................................. .

(B) Answer the following : 3

(i) Explain the meter used to measure the power in decibels with

a neat block diagram.

(C) Answer any one of the following in detail : 5

(i) Draw a neat block diagram of CRO and explain the time base

generator circuit.

Or

(ii) Explain the five applications of CRO.

4. (A) Answer the following : 2

(i) Give one point of difference between single phase energy meter

and induction type wattmeter.

(ii) State any two precautions to be taken while handling a Megger.

(B) Answer the following : 3

(i) Explain the photoelectric transducer with a neat diagram.

(C) Answer any one of the following in detail : 5

(i) Explain the HVBT with a neat diagram. State any two uses

of it.

Or

(ii) Describe the current transformer with a neat diagram. Give one

practical application of current transformer.

5. Answer the following : 10

(i) Explain the calibration of dc voltmeter with a neat diagram using

potentiometer method.

(ii) Draw a neat diagram of Hay’s bridge and state one advantage of it.

(iii) State any four applications of Megger.

(iv) Draw a neat block diagram of the voltmeter section of a digital

multimeter.

(v) State any two factors to be considered while selecting a transducer.