Goa Board Class 12 Question Paper June 2019 Domestic and Consumer Appliances

2019 VI 13 1430 Seat No.

Time : 2 Hours Domestic & Consumer Appliances

Subject Code

V 3 4 2

Total No. of Questions : 5 (Printed Pages : 4) Maximum Marks : 50

INSTRUCTIONS : (i) Write each question on fresh page.

(ii) All questions are compulsory.

(iii) Figures to the right indicate full marks.

(iv) Draw neat labeled diagram wherever necessary.

(v) Write serial number of question and sub-question clearly.

1. (A) Fill in the blanks : 1×2=2

(i) The function to open or close the circuit at predetermined

temperature like any ordinary switch is performed automatically

by ....................... .

(ii) In CD player reading of audio signal information stored on the

disc is done using .......................... .

(B) Answer the following : 3×2=6

(i) With the help of neat diagram explain the construction of swan

neck type electric kettle.

(ii) List any six precautions you will take while handling vacuum

cleaner

V-342 1 P.T.O.

(C) Answer the following : 2×1=2

Briefly explain four types of rotary positions used in electric hot

plate.

2. (A) Name the following : 1×2=2

(i) State the classification of washing machine with respect to their

operation.

(ii) What type of motor is used in exhaust fan ?

(B) Answer the following : 3×2=6

(i) With the help of neat diagram, explain the construction of simple

wet grinder.

(ii) Draw a neat diagram of manual toaster and explain.

(C) Answer the following : 2×1=2

Give any four precautions to be taken while handling immersion

heater.

3. (A) Fill in the blanks : 1×2=2

(i) The device used to control the magnitude and phase of applied

voltage in servomechanism type voltage stabilizer is .................. .

(ii) Cell is a basic building block of manufacturing ................... .

(B) Answer the following : 3×1=3

With the help of neat diagram briefly explain blower type of room

heater.

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(C) Answer the following : 5×1=5

(i) (a) Explain with a neat diagram float charging in battery.

(b) Briefly explain cross sectional diagram of gas lighter.

Or

(ii) (a) Briefly explain what a voltage stabilizer comprises of ?

(b) Explain the block diagram of fluorescent tube emergency
light.

4. (A) Answer in brief : 1×2=2

(i) What is the function of magnetron in microwave oven ?

(ii) What is the function of mixer stage in public address system ?

(B) Answer the following : 3×1=3

Draw the labeled diagram of electric bell and explain working principle
and operation.

(C) Answer the following : 5×1=5

(i) Draw block diagram of monochrome television and explain the
following blocks.

(a) Yagi antenna

(b) Video detector

(c) RF tuner

Or

(ii) Draw neat block diagram of AM radio receiver and explain each
block.

V-342 3 P.T.O.

5. Answer the following : 2×5=10

(i) State the type of motor, function of gear assembly and bearing in

electric drill machine.

(ii) State any four points of comparison between AM and FM radio

receiver.

(iii) Draw labelled block diagram of DTH.

(iv) Draw labelled diagram of compact disc and state its diameter.

(v) State any four requirements of public address system.

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