Short Answer Questions:
Q 1. What are the safety precautions to be followed while working on the following vehicle systems
- Exhaust system
- Ignition system
- Fuel system
- LPG fuel system
- High Voltage hybrid vehicular systems
Q2. What are the reporting procedures if you find faulty equipment in the workshop?
Q3. Discuss the reporting procedures in relation to following:
Q4. List five tools used for repairing electrical circuits of a vehicle? Write down the storage procedure of each tool after completion of the job?
Q5. Write down the electrical testing procedures for following scenario :
- Electrical resistance in the circuit
- Open circuit test
- Short circuit test
- Current flow test
Q1. Safety precautions during working on vehicle systems
1. Exhaust system.
Putting on goggles as majority of exhaust systems are rusty in order to prevent entry of dislodged metal chips into the eyes. Avoid working on the exhaust systems when the engine or exhaust is hot thus should be allowed to cool first
2. Ignition system
Recognized safety glasses must be always put on during operation of the ignition system. Hands must be always kept away from the spark plug wires during operation of the ignition system as the engine is running.
3. Fuel system
Always keep sleeves of shirts rolled and buttoned with an aim of avoiding spills from fuel. In addition loose materials should not be kept in the pocket as they can fall out resulting to sparks.
4. LPG fuel system
Consistent putting on of protective garments and clothing aimed at preventing burns, damages to the eyes and static electricity discharge. The battery vehicle should be disconnected and erection of warning signs should be done before engaging in the activity.
5. High voltage hybrid vehicular systems
Wearing of protective clothes such as insulated gloves and face shield are encouraged with an aim of protection from leaks from high voltage and risks from arc flash (Yu et al, 2011). The working area should be containing access restriction from unauthorized personnel as it is a dangerous high voltage area.
Q2. Reporting procedures for finding faulty equipment in a workshop
On identification of faulty equipment in the workshop, the individual responsible for the workshop should take the following procedures:
- Verbally report the occurrence to the responsible local department
- Physically remove the equipment that is faulty to avoid its further use
- Store the material in a safe environment
- Manufacturer should be promptly informed and joined by the investigators to the scene of incidence
- In a case where the equipment must still be used, all faulty parts must be vividly labeled.
Q3. Reporting procedures in relation to:
- Prompt reporting of illness by an employee
- Immediate sending of the employee to health services
- Documentation of the visit by a nurse
- Completion of the supervisors first report of employee injury form by the supervisor within a day from the illness
- Verbal reporting of the incident immediately
- On receiving the information, the supervisor must ensure that the employee receivers relevant first aid, adequate medical treatment, the incident reporting form is completed, ensure notification of all relevant personnel
- Reporting of the accident by the injured person
- The injured individual to key in what occurred in the accident book
- Completion of company accident investigation report (Crandall, 2011).
- Measures against repetition of the accident are generated through examination of the investigation findings
Q4. Tools for repairing vehicle electrical circuits and storage procedures
- Circuit testers- its handle is made of a steel blade for durability and insulated handle of plastic for safety
- Scan tools- the tools should be kept in a safe box
- Digital multimeters- it is kept in a meter case for durability
- Battery monitor reset tools- the set of tools should be kept safe from destruction risks
- Test light- it is stored in a safe box to avoid damages
Q5. Electrical testing procedures for the following scenarios
1. Circuit electrical resistance
- The battery is removed
- Meter selector dial is turned to one of the settings for resistance
- Analog meter is calibrated
- The points of intended resistance measurement are touched with meter leads
2. Open circuit test
- The open circuit power and transformer current of excitation are measured through series connection of a watt meter and ammeter
- Parallel connection of voltmeter to voltage source aimed at reading the applied test voltage
- The winding of HV is kept open
3. Short circuit test
- Power transformer is separated from service
- HV/LV jumps are removed
- Neutral is disconnected from the ground
- Short circuited terminals are connected to terminals
4. Current flow test
- A small voltage is placed across the chosen path.
- Whenever the flow of electrons is destructed by resistance, the circuit is open
Crandall, R.M., Harman Automotive Inc, 2011. Enhanced illuminated polymeric indicator employed in a mirror housing of an automotive vehicle. U.S. Patent 5,938,320.
Yu, Y., Naganathan, N.G. and Dukkipati, R.V., 2009. A literature review of automotive vehicle engine mounting systems. Mechanism and machine theory, 36(1), pp.123-142.