Goa Board Class 10 Question Paper Mar 2019 Electronics Pre Vocational

2019 IV 09 0930 Seat No.

Time : 2 Hours ELECTRONICS
Pre-Vocational (Electrical Group)

Subject Code

S 0 4 3

Total No. of Questions : 4 (Printed Pages : 3) Maximum Marks : 40

INSTRUCTIONS : (i) All questions are compulsory.

(ii) Draw a neat labelled diagrams wherever necessary.

(iii) Figures to the right indicate full marks.

(iv) Answer each question on a fresh page.

1. (A) Answer the following questions in one or two words each : 2

(i) What is the frequency of 230 Volts Domestic AC supply.

(ii) Name the microphone that has high Impedance.

(B) Answer the following questions in brief : 6

(i) Draw the circuit diagram of a half wave rectifier and state its

disadvantages.

(ii) Define the following :

(a) Self Inductance

(b) Mutual Inductance

(c) One Henry.

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(C) Answer the following question in brief : 2

What is public address system ? State one of its characteristics.

2. (A) Answer the following questions in one sentence each : 2

(i) What is a rectifier ?

(ii) Name the two transformers classified on the basis of its output voltage.

(B) Answer the following questions in brief : 6

(i) Draw a neat diagram of a simple core type transformer. State its
advantage over shell type transformer.

(ii) State the working principle of a moving coil speaker. State the two
classes of speakers based on their frequency response. What are
double conned speakers ?

(C) Answer the following questions in brief : 2

Draw the symbol of loud speaker. Compare Dynamic and Electrodynamic
speaker stating one point of difference.

3. (A) Answer the following in one or two words : 2

(i) How does a longitudinal wave travel ?

(ii) Name the part of the speaker that vibrates to produce sound.

(B) Answer the following questions in brief : 4

(i) State the two characteristics of a longitudinal wave.

(ii) What is meant by velocity of a sound wave ? What is the amplitude
of a sound wave ?

(C) Answer any one of the following in brief : 4

(i) With the help of a neat diagram explain the construction of a crystal
microphone.

(ii) With the help of a neat diagram explain the construction of a Ribbon
Microphone.

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4. (A) Answer the following questions in short : 2

(i) What is doping of a semiconductor ?

(ii) Define Kirchhoff’s current law.

(B) Answer the following in brief : 4
(i) An electric heater taken 3 Amps of current when connected to a
230 V AC Supply. Find the power consumed by the heater if the
supply frequency is 50 Hz.
(ii) What is forward biasing of a PN junction ? What is the state of
depletion region in a forward biased connection ?
(C) Answer any one of the following in detail : 4
(i) With a neat diagram explain the common collector configuration
of a NPN type transistor.
(ii) With a neat diagram explain the common emitter configuration of
a NPN type transistor.

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