Aviation Technology Paper 2 Questions and Answers - KCSE 2022 Past Papers

QUESTIONS

INSTRUCTIONS

STATION I
Figure 1 shows an assembly drawing of a light aircraft system part.

1. Identify the system and name the parts labelled 1, 2 and 3. (2 marks)
   
2. On the drawing paper provided, sketch in good proportion the exploded view of the unit labelled 3.(8 marks)

STATION 2
INSTRUCTIONS

Using the tools, equipment and materials provided, make the aircraft longeron as  shown in Figure 2. ( 10 marks)

STATION 3
INSTRUCTIONS

1. Study the aircraft components marked A, B, C, D, E and F and then perform the tasks detailed
   in Table 1.(6 marks)
   

   PART	IDENTIFICATION	FUNCTION
   A
   B
   C
   D
   E

2. Using the tools and equipment provided, perform each of the following tasks.
   1. Set the outlet compressor pressure at 15 psi and release the press right angle appropriately to blades on set up G (1 mark)
      Let the examiner check your work.
   2. Record your observations. (1 mark)
   3. Relate your observations to an aero gas turbine engine. (1 mark)
   4. Dismantle the set-up. (1 mark)
      Let the examiner check your work.

STATION 4
INSTRUCTIONS

1. Using tools and materials provided, make a simple model of the weather instruments shown in Figure 3. (4 marks)
   Let the examiner check your work progressively. 
   
2.  
   1. Light the bumer and place it under the can for about 40 seconds.
      Record your observation.
      Observation (1 mark)
      State the reason behind the observation in (b)(1). (1 mark)
      Reason
   2. Gently press down on the balloon.
      Record your observation.
      Observation
      State the reason behind the observation in (b)(ii).
      Reason
3. Identify the instrument and its application in the aviation industry.
   Instrument  (1⁄2 mark)
   Application  (1⁄2 mark)
4. From your observation in (b)(i) and (b)(ii) state the relationship to the atmospheric conditions and the effects of these changes.
   1. Relationship (1⁄2 mark)
   2. Effects           (1⁄2 mark)

INSTRUCTIONS
STATION 5

1. Identify each of the aircraft parts, materials and systems labelled 1-8 and complete
   Table II and II
   

   LABEL	PART	MATERIAL
   1
   2
   3
   4

   
   Table II   (4 marks)
   

   LABEL	PART	SYSTEM
   5
   6
   7
   8

   
   Table III (4 marks)
2. Apply the given loads on each of the materials labelled 9-10 and complete Table IV.
   

   MATERIAL	LOAD	OBSERVATION	PROPERTY
   9	Tension
   10	Bending

   
   Table IV  (2 marks)

STATION 6

INSTRUCTIONS

1. Study and identify each of the signs marked G, H, I, J, K, and L.. (3 marks)
   

   SIGN	IDENTIFICATION
   G
   H
   I
   J
   K
   L

2. Using the aeroplane model provided, demonstrate to the examiner each of the following (4 marks)
   1. Yawing
   2. Overshoot
   3. Rolling
   4. Pitching
3. Demonstrate to the examiner each of the following helicopter marshalling signals (3 marks)
   1. Move horizontally right
   2. Move downwards
   3. Hover

INSTRUCTIONS

STATION 7
Using the parts marked O, P and Q perform each of the following tasks

1.  
   1. Connect Pipe X to port P on the instrument marked "O".
      Let the examiner check your work.  (1 mark)
   2. Apply a pressure of 5 pei to port marked "P' and record your observation. (1 mark)
      Observation
   3. Connect Pipe Y to port Q (1 mark)
      Let the examiner check your work.
   4. Apply pressure of 5 psi and recced your observation. (1 mark)
      Observation
   5. Rele pressure on P and record your observation (1 mark)
2. Explain the rs behind the observation in (x)(i) and (a)(iv) with reference to an
   all in level flight. (2 marks)
   Reason a (ii)
   Reason(a)(iv)
3. Study the instrument marked XY and identity range markings coloured RED, YELLOW and GREEN (3 marks)
   1. RED
   2. YELLOW
   3. GREEN

STATION 8

INSTRUCTIONS

1.  
   1. Connect the components provided as shown in the circuit in Figure 4. (5 marks)
      Let the examiner check your work
      
   2. Pre the switch to "ON" position and record your observation. (1 mark)
   3. State where the system is applicable on an aircraft. (1 mark)
      Application
   4. Give two reasons for use of the system no an aircraft. (1 mark)
      Reasons
2. State the function of each component in the circuit in Figure 4. (2 marks)

STATION 9

1. Using the most appropriate tools, take and record the measurements of the aircraft components painted red, white, green and blue and complete Table (V).
   

   AREA TO BE MEASURED	MEASUREMENT TAKEN	TOOLS USED
   Outside diameter for part painted RED
   The angle of the part painted WHITE
   The gap of part painted GREEN
   Internal diameter of part painted BLUE

   
   Table (V)  (6 marks)
2.  Identify the aircraft hardware labelled T, U, V and W and state one probable defect for each and complete Table (VI).
   

   HARDWARE	DIRECT
   T
   U
   V
   W

   
   Table VI (4 marks)

STATION 10

1.  Study the specimens labelled 11-14 and for each:
   1.  identify the specimen
   2. state the use.
   3. state the system applicable.
      Complete Table (VII).  (6 marks)
      

      SPECIMEN	IDENTITY	USE	SYSTEM
      11
      12
      13
      14

2.  
   1. Disassemble the component marked 15. (1⁄2 mark)
      Let the examiner check your work.
   2.  Identify the parts painted red, blue, white and green. (2 marks)
      Red
      Blue
      White
      Green
   3. Carry out the servicing. ( 1 mark)
   4. Assemble the component (1⁄2 mark)
      Let the examiner check your work.

MARKING SCHEME

1. System: Landing gear
   Parts
   1. Brake disc
   2. Strut
   3. Brake housing
      (4x-2 mark)
2. 
   
   (2 marks)
   Proportionality 1x1-1 mark
   Correct arrangement of parts 1x1-1 mark
   Sketching the parts correctly 1-6
   6x1-6 mark
   (Any from each group) 8 marks

STATION 3

STATION 4

2.  
   1. Obsevation
      Reason
   2. Observation
      Reason
3. instrument: Barometer
   Application: Measuring the changes in atmospheric pressure.
4.  
   1. changes in atmospheric pressure
   2. Cause wind/air movement

STATION 5

STATION 6

STATION 7

1.  
   1. Dial moves, indicating increase
   2. No change in dial reading
   3. Dial moves in the opposite direction(decreasing)
2.  
   1. In level flight, the static pressure is held constant
   2. Dynamic pressure increased with increase in forward speed.
3.  
   1. Green-normal operating range
   2. Yellow-caution range
   3. Red-Never exceeding range

STATION 8

1.  
   2.  
      • The lamp lights up
      • The buzzer rings
      • Makes relays
   3. Landing gear extension/retraction system.
   4.  
      • Warning/Fire protection
      • Alerting/External lighting in Aircraf
2. Battery Provide power
   Relay Switching mechanism
   Lamp Indication (lighting)
   Buzzer-Warning/ alerting/audio
   Switch Circuit connection

STATION 9

1.   
   

   AREA TO BE MEASURED	MEASURMENT	TOOL USED
   Red - outiside diameter	SAMPLE DATA	Vernier caliper
   White - angle	SAMPLE DATA	Bevel gauge
   green - gap	SAMPLE DATA	Feeler gauge
   Blue - internal diameter	SAMPLE DATA	Ball and macro meter

2.  
   

   HARDWARE	DEFECT
   T- control cable	corrosion broken wires
   U-circlip	cracks or distortion loss of springgingness
   V- tab washer	broken tab cracks
   W- tapered roller bearing	signs of overheating corrosion crcks

STATION 10

1.   
   

   SPECIMEN	IDENTIFICATION	PURPOSE	SYSTEM
   11	grease	reduce friction lubrication	landing gear flight control
   12	hydraulic flui	transfer of power	landing gear flight control breaking system
   13	kerosene	chemical power	jet engine propulsion system
   14	turubuckle	joining cables	engine and flight controls

2.  
   2. • Driven gear
      • Driver
      • Inlet port/Housing
      • Housing/Hexagonal head bolt
        (4 x 0.5-2 marks)