Karnataka SSLC Question Paper 2022 Answer Key Elements of Mechanical Engineering & Electrical Engineering

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KARNATAKA SECONDARY EDUCATION EXAMINATION BOARD, MALLESHWARAM,
BANGALORE – 560 003
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S. S. L. C. EXAMINATION, MARCH/APRIL, 2022

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MODEL ANSWERS
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Date : 01. 04. 2022 ] CODE NO. : 71

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Subject : ELEMENTS OF MECHANICAL AND
ELECTRICAL ENGINEERING-2
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[ Max. Marks : 100

Qn. Sub.
Value Points Marks
Nos. Qn.No.
SECTION - A
1. a) Define I.C. engine. 2
I.C. engine is a heat engine which converts the heat energy
released by the combustion of fuel into mechanical work. 2
b) Mention the parts of IC engine. 3
Parts
i) Cylinder
ii) Piston

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iii) Piston rings
iv) Connecting rod
v) Crank and crank shaft
vi) Valves
vii) Fly wheel
viii) Crank case. 3
c) Differentiate between petrol engine and diesel engine. 5
Petrol engine Diesel engine
i) It works on otto cycle i) It works on diesel cycle
which is also called as which is also called as
constant volume cycle constant pressure cycle

ii) Petrol is used ii) Diesel is used

iii) Air and Petrol mixture iii) Only air is drawn
is drawn during the during the suction
suction stroke stroke

iv) Low compression ratio iv) High compression ratio
ranging from 7 : 1 to ranging from 16 : 1 to
12 : 1 20 : 1.

v) High engine speed of v) Low engine speed
about 3000 rpm ranging from 500 to
1500 rpm.
5
2. a) What is an air compressor ? 2
Air compressors are power absorbing devices which are
used to increase the pressure of air at least by two times. 2
b) How are the air compressors classified ? 3
Air compressors are classified as
i) Reciprocating air compressor
ii) Centrifugal air compressor 3

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c) Draw a neat sketch of reciprocating air compressor and
label the parts. 5
Sketch of air compressor

Reciprocating Air Compressor Sketch -
4 5
Parts - 1
3. a) What is refrigeration ? 2

Refrigeration is defined as a method of reducing the

temperature of a system below that of the surroundings. 2

b) Mention the applications of air-conditioning. 3

Applications

i) Residential air conditioning

ii) Commercial air conditioning

iii) Industrial air conditioning. 3

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c) Draw a neat sketch of refrigeration system and label the
parts. 5
Diagram of Refrigeration system

5

4. a) List the types of refrigerants. 2

Types of Refrigerants

i) Air

ii) Ammonia

iii) Carbon dioxide

iv) Sulphur dioxide 2

b) Mention the uses of air compressor. 3

Uses of Air compressor

i) Used for washing vehicles

ii) Used for inflating tubes and tyres

iii) Used in spray painting

iv) Used for pneumatic drives

v) Used for cooling buildings

vi) Used in hospitals.
3

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c) Draw a neat sketch of summer air-conditioning system

and label the parts. 5

Sketch of summer air-conditioning

5

5. a) What is the main function of lathe ? 2

The main function of the lathe is to remove material from

the work piece. 2

b) Write the types of lathes. 3

Types of lathes

i) Engine lathe

ii) Bench lathe

iii) Tool Room lathe

iv) Speed lathe

v) Capstan and turret lathe

vi) Automatic lathe. 3

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c) Draw a neat sketch of lathe and label the parts. 5

Lathe

5

OR

a) What is drilling ? 2

Drilling is the operation used to produce cylindrical holes

in a work piece. 2

b) Write the types of drilling machines. 3

Types :

i) Portable drilling machine

ii) Sensible drilling machine

iii) Upright drilling machine

iv) Radial drilling machine

v) Multiple drilling machine

vi) Gang drilling machine. 3

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c) With a neat sketch explain reaming operation. 5

Reaming operation

Reaming operations used for sizing and smoothing the
5
drilled holes.

6. a) Classify the IC engines according to the types of Ignition.

2

Classification of engine

i) Spark ignition engine

ii) Compression ignition engine. 2

b) Write a short note on connecting rod. 3

Connecting Rod

It is a link that connects the piston and the crankshaft by

means of Pin joints. It converts the rectilinear motion of

the piston into rotary motion of the crankshaft. 3

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c) With a neat sketch explain the operation of plain turning.
5
Sketch of Plain Turning

In this type of turning, workpiece is supported in between
the two centres which permit the rotation of the work-
piece. This method of operation workpiece is reduced to
the cylindrical section of required diameter. 5
SECTION - B
7. a) List the types of induced e.m.f. 2
Types of induced e.m.f.
Induced e.m.f.

Statically Dynamically
Induced e.m.f. Induced e.m.f.

Self-induced Mutually induced
e.m.f. e.m.f. 2
b) State Faraday's second law of electromagnetic induction.
3
Second Law
The magnitude of the e.m.f. induced in a circuit is directly
proportional to the rate of change of flux linkages.
N ( φ 2 − φ1 )
∈=
t 3

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c) Draw a neat sketch of self-induced e.m.f. and label the
parts. 5
Sketch of self-induced e.m.f.

A - Ammeter I - Current
R - Rheostat S - Switch
B - Battery eL - Back e.m.f.
Sketch - 4
Parts - 1 5
8. a) Define the term ‘maximum value’. 2
Maximum Value
Highest value of an alternating quantity attained in one
half cycle called max. value. 2
b) Explain power and power factor. 3
i) Power
The rate at which electrical work is done is called
electrical power. S.I. unit is 'Watt' or 'Kilowatt'.
ii) Power factor
Power factor is the ratio of true power and apparent
power. It has no unit. 3

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c) Draw a neat sketch of sine wave and mark the following :

5

i) Time period

ii) Cycle.

Sketch of sine wave

+ V = Positive voltage

– V = Negative voltage

π = 90° , π = 180° , 3 π = 270° , 2π = 360° 5
2 2

9. a) List the types of statically induced e.m.f. 2

Types

i) Self-induced e.m.f.

ii) Mutually induced e.m.f. 2

b) Describe dynamically induced e.m.f. 3

Dynamically induced e.m.f.

Whenever a conductor is moved in a magnetic field, which

causes an e.m.f. is induced in a conductor this type of

induced e.m.f. is called dynamically induced e.m.f. 3

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c) Draw a neat sketch of electromagnetic induction and label
the parts. 5
Sketch of Electro-magnetic Induction

N = North pole
S = South pole Bar Magnet
B = Bobbin
C = Coil Sketch - 4
5
G = Galvanometer Parts = 1
OR
a) Define the term ‘form factor’. 2
Form factor is the ratio of rms value to the average value. 2
b) Compare rms value and average value. 3
Average value RMS value
The average of Root mean square value of
instantaneous values of an alternating quantity is
e.m.f. is referred as average rms value
value
3
c) Draw the diagram of dynamically induced e.m.f. and label
the parts. 5
Sketch of Dynamically Induced e.m.f.

Sketch = 4 5
Parts = 1

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10. a) What do you mean by thermostat ? 2
Thermostat
Thermostat is automatic temperature control switch. It
consists of bi-metal strips. 2
b) Explain Forward bias. 3
Forward bias
When an external voltage is applied, such that positive
terminal of the battery is connected to P-type
semiconductor and the negative terminal of the battery is
connected to N-type semiconductor, is called forward bias. 3
c) Draw a neat diagram of an electric iron and label the
parts. 5
Diagram of an Electric Iron

Sketch - 4
Parts - 1 5

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