Goa Board Class 12 Question Paper June 2019 Industrial Electronics and Instrumentation

2019 VI 13 1430 Seat No.

Time : 2 Hours INDUSTRIAL ELECTRONICS
AND INSTRUMENTATION
Subject Code

V 3 3 4

Total No. of Questions : 5 (Printed Pages : 3) Maximum Marks : 50

INSTRUCTIONS : (i) All questions are compulsory.

(ii) Answer each question on a fresh page.

(iii) Figures to the right indicate full marks.

(iv) Draw neat diagrams wherever necessary.

(v) Write the number of the questions and sub-
questions clearly.

1. (A) Fill in the blanks : 2×1=2

(i) The name of the power control switch that is used in an over
light detector circuit is ..................... .

(ii) An example of an active transducer is ....................... .

(B) Answer the following :

(i) With the help of a neat diagram explain the working of an
Electrocardiogram.

(ii) Explain the construction of a photovoltaic cell and state any two
application of it.

(C) Draw the diagram of a two point starter used in a DC Motor.

2. (A) Answer the following/define : 2×1=2

(i) Voltage regulator

(ii) Sensitivity of a meter.

(B) Answer the following : 2×3=6

(i) With the help of a neat block diagram explain the working of
an inveter.

(ii) State any three point of comparision between RF signal generator
and AF signal generator.

(C) Answer the following in short : 1×2=2

State the two types of speed control method used in a DC shunt
motor.

3. (A) Fill in the blanks : 1×2=2

(i) The type of semiconductor material that is used in an IRLED
is ................ .

(ii) The ratio of change in the output voltage with the change in
load current is known as ...................... .

(B) Answer the following : 3×1=3

Draw a neat block diagram of CRO and state the function of verfical
amplifier and delay line.

(C) Answer the following in detail : 5

(i) Draw the functional block diagram of timer IC 555 and epxlain.

Or

(ii) With a neat circuit diagram explain the working of monostable
multivibrator using timer IC 555.

4. (A) Answer the following in one sentence/word : 2

(i) Name the electronic component whose resistance changes with
the change in temperature.

(ii) State the output time equation of an Astable Multivibrator using

timer IC 555.

(B) Answer the following : 3×1=3

With a neat Circuit diagram explain range extension of a voltmeter.

(C) Answer the following in detail (any one) : 5×1=5

(i) Define a resistive transducer. With a neat diagram explain any

one type of a strain gauge transducer.

Or

(ii) Define a capacitive transducer. With a neat diagram explain the

working of a microphone as a capacitive transducer.

5. Answer the following in short : 2×5=10

(i) Draw the circuit diagram of a lamp dimmer constructed using a DIAC

and TRIAC.

(ii) State any two points of comparision between LED and LCD.

(iii) Explain the need of a starter in a DC motor.

(iv) Explain the working of tong tester.

(v) With a neat diagram explain the measurement of time period using

a CRO.