MBOSE Class 12 Question Paper 2022 for Electronics and Hardware

Total No. of Printed Pages—4
HS/XII/V/EH/22

2022

ELECTRONICS AND HARDWARE
( Vocational Course )

( Installation Technician Computing Peripherals )

Full Marks : 30
Time : 1 hour

The figures in the margin indicate full marks for the questions

1. Choose the correct answer : 1×4=4
(a) Miniature circuit breaker is a small
(i) fuse

(ii) magnetic switch

(iii) electromagnetic switch

(iv) two-way switch

(b) A simple enclosed length of wire that has a low
melting point is known as
(i) resistor

(ii) fuse

(iii) circuit breaker

(iv) thermistor

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( 2 )

(c) SF6 gas is transported in

(i) air cylinder

(ii) gas cylinder

(iii) liquid form in cylinder

(iv) solid form

(d) The technology behind AC motor speed consists of

(i) rectifier circuit

(ii) DC circuit

(iii) inverter unit

(iv) All of the above

2. Fill in the blanks : 1×4=4

(a) PLC stands for _____.

(b) The meter constant of single-phase energy meter is
expressed in terms of _____.

(c) The voltage of 3-phase system is _____.

(d) _____ is used to control the RPM of motor.

HS/XII/V/EH/22/70 [ Contd.

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

(a) What is three-phase system?

(b) What is alternator?

(c) What are relays?

(d) What is the function of PT?

(e) What is distribution transformer?

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

(a) What are contactors? Draw the circuit connection of
motor using contactor.

(b) What is soft starter? Why is it needed?

(c) What are the two types of connection in three-phase
system? Draw the circuit diagram of both types of
connection.

(d) Differentiate between RCCB and ELCB.

(e) What is a circuit breaker? What are its types?

HS/XII/V/EH/22/70 [ P.T.O.

( 4 )

5. Answer the following essay-type questions (any three) :
4×3=12
(a) Draw the block diagram of solar power plant.
Explain briefly the function of each of its
components.

(b) Explain briefly the working of a transformer.
Differentiate between single-phase and three-phase
transformers with diagram.

(c) What is energy meter? Draw a diagram representing
the construction of an energy meter. Briefly explain
the working of energy meter.

(d) What is communication? Explain different methods
of communication.

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HS/XII/V/EH/22/70 22K—160