Summary

• Description:

  The PDF document comprises KALA Joint Trials 2024 Power Mechanics Paper 1 Exam with Answers and Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Power Mechanics Paper 1 (447/1) Joint Trial examination administered in July 2024.

  • Duration: 2 Hours 30 Minutes
  • Total Marks: 100
  • Number of Questions: 15
  • Paper Structure: Two Sections – Section A and Section B.

  The paper was structured as follows:

  • Section A (40 marks): Ten compulsory short-answer questions testing knowledge of workshop practice, tools, engine systems, and vehicle components.
  • Section B (60 marks): Five structured questions where candidates answered Question 11 (drawing question) and any other three questions.

  The examination assessed learners’ understanding of vehicle systems, workshop safety, engineering drawing, and mechanical principles applied in automotive technology.

  It covered the following topics:

  • Advantages of technical education in Kenya
  • Workshop safety hazards such as oily floors and poor ventilation
  • Identification and sketching of hand tools including engineer’s bevel and screw pitch gauge
  • Types and applications of washers in vehicle assemblies
  • Gasket materials used in internal combustion engines
  • Material properties such as elasticity and fusibility
  • Effects of altitude on engine performance
  • Methods of reducing air–fuel mixture resistance during the induction stroke
  • Valve refitting procedures in cylinder head assembly
  • Steering ratio calculations and steering system principles
  • Oxy-acetylene welding and its applications
  • Interpretation of tyre rating specifications
  • Engine processes including atomization and detonation
  • Mechanical fastening methods such as double-nutting
  • Diagnosis of engine faults including tappet noise and overheating
  • Types of chassis frames used in motor vehicles
  • Operation of stabilizer bars and disc brake self-adjustment
  • Procedures for assembling a cylinder head to an engine block
  • Externally threaded fasteners used in engine assembly
  • Engineering drawing involving orthographic projection of a machined bracket
  • Cooling system faults and causes of engine overheating
  • Operation of thermosiphon cooling systems
  • Diagnosis of piston pin noise and engine bearing clearances
  • Measurement of bearing clearance using plastigauge
  • Vehicle ignition systems including magneto and battery ignition
  • Characteristics and selection of spark plugs
  • Functions of the propeller shaft in vehicle transmission
  • Operation of a differential unit when a vehicle turns
• File Size:

  420.39 KB
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  POWER MECHANICS
• Posted By:

  Caleb_Peter

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