Power Mechanics Paper 2 Questions and Answers - KCSE 2022 Past Papers

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QUESTIONS

STATION I

In the space provided below, sketch in good proportion a sectional longitudinal view of a sparking plug and label four main parts. (10 marks)

STATION 2
Using the tools and materials provided, make the bracket shown in the figure below. (10 marks)
st 2

STATION 3

Identify the vehicle parts labelled A, B, C, D and E and state the vehicle system in which each is used. Name the material each part is made of and state the use of each part in the vehicle. Complete the table. (10 marks)

Label	Name	Vehicle system	Material	Cause
A
B
C
C
D

STATION 4

On the single cylinder engine provided:

perform the pre start up checks
start the engine and adjust to attain the smoothest idling speed (10 marks)

LET THE EXAMINER CHECK YOUR WORK

STATION 5

Using the tools and materials provided, connect a twin headlight parallel circuit controlled by a single switch. (10 marks)

LET THE EXAMINER CHECK YOUR WORK

STATION 6

Identify the engine parts labelled F, G, H, J and K. In each case, identify one defect and state one possible cause and one possible effect of the identified defect. Complete the table. (10 marks)

Label	Name	Defect	Cause	Effect
F
G
H
J
K

STATION 7

On the brake drum of the motor vehicle provided, perform each of the following tasks.

remove the retum spring
measure the tension of the spring
replace the return spring (10 marks)
LET THE EXAMINER CHECK YOUR WORK

STATION 8

Identify each of the following tools and substances labelled Q to Z und in each case, state one use in a motor vehicle. Complete the table.

Label	Name	Use
Q
R
S
T
U
V
W
X
Y
Z

STATION 9

Using the oxy-acetylene equipment provided, braze the hole identified by the examiner on the vehicle part provided.
(10 marks)

LET THE EXAMINER CHECK YOUR WORK.

STATION 10
On the multi-cylinder engine provided, demonstrate to the examiner how to identify a misfiring plug.

LET THE EXAMINER CHECK YOUR WORK. (10 marks)

MARKING SCHEME

STATION 1
st1

Correct sketch (6 main parts: 6 x 1⁄2)-3
Correct sectioning (Any 3 x 1)-3
Longitudinal=1
Labelling (Any 4x 1⁄2)=2
Quality of hatching=1
TOTAL10 marks

STATION 3

PART	NAME	VEHICLE SYSTEM	MATERIAL	USE
A	Radiator	cooling	Plastic	Reserves overflow coolan
B	Wheel valve cap	wheels and tyres	rubber	prevent pressure leakage
C	Air cleaner element	fuel system	paper cartilage	filtering dirt particles
D	ignition resistor	ignition system	porcelain and copper	reduces battery voltage (12 V) to coil voltage (6V)
E	sump	lubrication system	pressed steel (low carbon steel)	holding oil

STATION 6

LABEL	NAME	DEFECT	CAUSE	EFFECT
F	spring washer	flattened	excess torqueing misuse	loss of torque loading nuts can work loose
G	piston ring	excess	prolong wear breakage	loss of engine power engine miss
H	shell bearing	worn out or cracked	poor lubrication prolonged usage	poor sealing poor lubrication
J	fuel tank cap	cracked or perforated	carelessness	loss of fuel through evaporation risking (danger of fire outbrea
K	gear	broken tooth	lack od lubrication misuse	noisy transmission poor/weak transmission

STATION 8

LABEL	NAME	USE
Q	tyre tube valve key	to tighten tyre valve
R	chuck key	to tighten and loosen twist drills
S	universal joint	to facilitate access to bolts/nuts in areas not easily accessible
T	tap holder	to hold taps when cutting internal threads
U	welding gas nozzle	to direct welding flames to the point of impact
V	grease	for lubrication of joints
W	vaseline	to cover battery terminals
X	silicon	to seal hoses in cooling system
Y	hard solder bar	to clean surfaces being soldered
Z	lapping paste	to help valve faces and seats