Power Mechanics Paper 1 Questions and Answers - Bunamfan Cluster Pre Mock Exam 2022

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Instructions to candidates

  • Write your name and admission number in the spaces provided above.
  • Sign and write the date of examination in the spaces provided above.
  • Candidates should have the following for this examination:
    - Drawing instruments;
    - Scientific calculator
    - Drawing paper size A3.
  • This paper consists of two sections; A and B.
  • Answer all the questions in section A in the spaces provided.
  • Answer question 11 on A3 paper and any other three questions from section B in the spaces provided.
  • All dimensions are in millimeters unless otherwise stated.
  • This paper consists of printed pages.
  • Candidates should answer the questions in English.


Questions

SECTION A(40 marks)
Answer all questions in this section in the spaces provided

  1.      
    1. List four classes of body cuts. (4mks)
    2. State one safety measure that should be taken under the following circumstances.
      1. Acid spills in your eyes. (1mk)
      2. Fire breaks in the workshop. (1mk)
  2. Identify the following tools and state uses of each in power mechanics workshop. (4mks)
     Tool Name Used for
      
      22PwrMchP1q2a

       
        
      22PwrMchP1q2b
      
       
  3. Give three reasons why aluminium alloys are used in making of piston. (3mks)
  4. The diagram below shows an engine system. Use it to answer the questions that follows.
    22PwrMchP1q4
    1. Name the system. (1mk)
    2. On the diagram, use an arrow to show where valve clearance is measured. (1mk)
    3. Name the components labeled A and B. (2mks)
      1. A ______________________________
      2. B ______________________________
    4. State the functions of components C and D. (2mks)
      1. C ______________________________
      2. D ______________________________
  5. Explain two reasons why choke valve should be opened immediately after the engine starts. (2mks)
    22PwrMchP1q6
  6. Use the diagram below to answer the questions that follows.
    1. On the diagram, indicate the direction of fuel flow. (2mks)
    2. Name the parts labeled P, Q, R and S. (4mks)
      1. P________________________________
      2. Q________________________________
      3. R________________________________
      4. S________________________________
  7. State three permanent metal joining processes. (3mks)
  8. In the space provided below, draw a three phase diode rectification diagram. (3mks)
  9. Explain the following terms as used in spark plug. (3mks)
    1. Heat range___________________________
    2. Spark plug reach______________________
    3. Spark plug diameter____________________
  10. Sketch in first angle orthographic views of the following pictorial drawing. (4mks)
    22PwrMchP1q10

SECTION B (60 marks)
Answer question 11 on A3 paper provided and any other three questions from this section in the spaces provided. Candidates are advised to spend not more than 25 minutes on question 11.

  1. The following is a machine block drawn in isometric projection.
    22PwrMchP1q11
    Draw the following views in first angle orthographic projections. (15mks)
    1. Plan
    2. Front viewed from direction A
    3. End view
  2.  
    1. Explain the following activities in a diesel engine: (4mks)
      1. Induction stroke
      2. Exhaust stroke
      3. Compression stroke 
      4. Power stroke
    2. State three advantages of a rotary engine as compared to reciprocating engine.(3mks)
    3. Explain the functions of the following engine parts; (4mks)
      1. Recoil starter
      2. Power take – off shaft
      3. Automatic advance
      4. Dip stick
    4. Explain the meaning of the following terms; (4mks)
      1. Lean mixture
      2. Rich mixture
      3. Over square engine
      4. Under square engine
  3.          
    1. Identify two precautions to be observed when handling each of the following equipment in a workshop. (6mks)
      1. Gas cylinders
      2. Hoses and connections
      3. Torches
    2. Define backfire in oxy-acetyline welding. (1mk)
    3. With the aid of diagrams differentiate between leftward and rightward welding techniques. (8mks)
  4.     
    1. State four factors which are considered when selecting oil for use in a particular engine. (4mks)
    2. List and explain four types of engine lubrication. (4mks)
    3. With aid of a sketch, explain how oil pressure indicator light operates. (7mks)
  5. Use a neat diagram to show the construction and explain operation of a voltage regulator. (15mks)

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