MBOSE Class 12 Question Paper 2019 for Electronics

Total No. of Printed Pages—4
19/VC/EL

2019

ELECTRONICS

( Vocational Course )

Full Marks : 30

Time : 1 hour

The figures in the margin indicate full marks for the questions

1. Choose the correct answer : 1×8=8

(a) Which one of the following semiconductor materials used
in photovoltaic cell?
(i) Silicon

(ii) Copper

(iii) Germanium

(iv) Gold

(b) Which part of the transformer provides a controlled path
for the magnetic flux?
(i) Core

(ii) Primary winding

(iii) Secondary winding

(iv) Enclosure

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( 2 )

(c) Electric iron heating elements is made from
(i) copper
(ii) aluminium
(iii) MS sheet
(iv) Nichrome wire

(d) Which one of the following is not an electric bell?
(i) Single-stroke bell
(ii) Starfish desk bell
(iii) Vibrating
(iv) Buzzer

(e) Fuse is always connected in _____ wire.
(i) neutral
(ii) phase
(iii) earth

(f) _____ is not the type of transformer according to its
construction.
(i) Autotransformer
(ii) Core-type transformer
(iii) Shell-type transformer
(iv) Berry-type distributed core transformer

(g) The SI unit of current is
(i) columb
(ii) ohm
(iii) ampere
(iv) volt

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( 3 )

(h) Ebonite handle belongs to _____ type of electrical
appliance.
(i) electric geyser
(ii) electric water heater
(iii) electric iron

2. Answer in 1 word or 1 sentence each (any four) : 1×4=4

(a) What is an inverter?

(b) What is the function of secondary winding in transformer?

(c) What do you mean by billing?

(d) What is the function of asbestos sheet in electric iron?

(e) Write the full form of MCB.

(f) What is fluorescent tube?

3. Answer the following questions in 3 or 4 sentences each
(any three) : 2×3=6

(a) What is a solar cell?

(b) Define earthing. What are the types of earthing?

(c) What are the advantages of choke in tube light?

(d) State the working principle of a transformer.

(e) Name the different types of electric iron.

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( 4 )

4. Answer the following essay-type questions (any three) : 4×3=12

(a) Explain with block diagram and connection diagram of
DC power supply.

(b) Explain with diagram the working principle and
applications of a transformer.

(c) Describe a full-wave bridge rectifier with filter.

(d) Explain the parts and functions of electric iron.

(e) State the working principle of single-phase motor and
draw the circuit diagram of all single-phase motors.

HHH

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