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Explain each of the following tasks performed by a lathe machine: i) falling; ii) _ boring; iii) reaming; iv) knurling.(8 marks)June/July 2020
i) Facing: Facing is a machining process that is used to create a flat surface on the end of a workpiece. On a lathe, facing is typically done by using a single-point cutting tool that is mounted on the lathe's tool post. The tool is moved across the face of the workpiece to remove material and creaRead more
i) Facing: Facing is a machining process that is used to create a flat surface on the end of a workpiece. On a lathe, facing is typically done by using a single-point cutting tool that is mounted on the lathe’s tool post. The tool is moved across the face of the workpiece to remove material and create a flat surface.
ii) Boring: Boring is a machining process that is used to create a hole with a precise diameter and depth. On a lathe, boring is typically done by using a single-point cutting tool that is mounted on the lathe’s tool post. The tool is moved into the workpiece to remove material and create the desired hole.
iii) Reaming: Reaming is a machining process that is used to smooth and finish the walls of a hole that has already been created. On a lathe, reaming is typically done by using a reamer, which is a specialized cutting tool that is mounted on the lathe’s tool post. The reamer is rotated and moved into the hole to remove any burrs or roughness and create a smooth finish.
iv) Knurling: Knurling is a machining process that is used to create a pattern of raised ridges on the surface of a workpiece. On a lathe, knurling is typically done by using a knurling tool, which is a specialized tool that is mounted on the lathe’s tool post. The tool is rotated and pressed into the workpiece to create the desired pattern of ridges.
See lessOutline four precautions observed when operating a lathe machine.(6 marks)June/July 2020
Here are some precautions that should be observed when operating a lathe machine: Wear proper personal protective equipment (PPE): This includes wearing protective eyewear, gloves, and closed-toe shoes to protect against injuries from flying debris or contact with the lathe. Secure the workpiece: ThRead more
Here are some precautions that should be observed when operating a lathe machine:
State five maintenance practices for hand tools.(5 marks)June/July 2020
Here are some maintenance practices for hand tools: Cleaning: Hand tools should be kept clean at all times to ensure that they are in good working order. This can be done by wiping them down with a clean cloth or using a compressed air duster to remove any dirt or debris. Sharpening: If a tool becomRead more
Here are some maintenance practices for hand tools:
Explain three functions of diesel injection system.(6 marks)June/July 2020
Metering the correct amount of fuel: The injection system is responsible for metering the correct amount of fuel based on the engine's operating conditions, such as speed, load, and temperature. Delivering the fuel to the engine: The injection system is responsible for delivering the fuel to the engRead more
State three factors considered in selection of pumps. (5marks)June/July 2020
There are several factors that should be considered when selecting a pump, including: The type of fluid being pumped: Different pumps are designed to handle different types of fluids, so it is important to choose a pump that is compatible with the fluid being pumped. The required flow rate: The pumpRead more
There are several factors that should be considered when selecting a pump, including:
Explain each of the following terms used in pumps: i) strainer; ii) static sunction lift; iii) volumetric flow.(6 marks)June/July 2020
i) A strainer is a device that is used to filter out any solid particles that may be present in a fluid. It is typically used in pump systems to protect the pump from damage caused by debris. ii) Static suction lift refers to the maximum height that a pump can lift a liquid without any additional prRead more
i) A strainer is a device that is used to filter out any solid particles that may be present in a fluid. It is typically used in pump systems to protect the pump from damage caused by debris.
ii) Static suction lift refers to the maximum height that a pump can lift a liquid without any additional pressure being applied. This is determined by the density of the liquid and the atmospheric pressure.
iii) Volumetric flow is a measure of the volume of a fluid that is flowing through a pump in a given time period. It is typically measured in units of volume per time, such as liters per minute or gallons per hour. Volumetric flow is important because it determines the capacity of a pump and how much fluid it can handle.
See lessState four precautions observed when lifting heavy objects in workshop manually.(4 marks)June/July 2020
Some precautions that should be observed when lifting heavy objects manually in a workshop include: Assessing the load: Make sure that the load is stable and that it can be safely lifted by the number of people available. Wearing appropriate protective equipment: Wear gloves to protect your hands, aRead more
Some precautions that should be observed when lifting heavy objects manually in a workshop include:
Explain how each of the following fire extinguishers work: i) carbon dioxide; ii) water and foam; iii) cartridge operated dry chemicals.(6 marks)June/July 2020
i) Carbon dioxide (CO2) fire extinguishers work by releasing a jet of CO2 gas from the nozzle, which helps to smother the fire by reducing the oxygen supply. The CO2 gas is also very cold, so it helps to cool the surrounding area and prevent the fire from spreading. ii) Water and foam fire extinguisRead more
i) Carbon dioxide (CO2) fire extinguishers work by releasing a jet of CO2 gas from the nozzle, which helps to smother the fire by reducing the oxygen supply. The CO2 gas is also very cold, so it helps to cool the surrounding area and prevent the fire from spreading.
ii) Water and foam fire extinguishers work by releasing a mixture of water and foam onto the fire. The water helps to cool the surrounding area and the foam helps to smother the fire by reducing the oxygen supply. The foam also helps to create a barrier between the fire and the surrounding area, which can help to prevent the fire from spreading.
iii) Cartridge operated dry chemical fire extinguishers work by releasing a dry chemical powder from the nozzle. The dry chemical powder helps to smother the fire by reducing the oxygen supply, and it also helps to cool the surrounding area. The dry chemical powder is also designed to react with the fire, creating a barrier that can help to prevent the fire from spreading.
See lessHighlight five obligations of each of the following in relation to health and safety act. i) company owners; ii)employees.(10 marks)June/July 2020
The Health and Safety Act is a law that sets out the obligations of employers and employees to ensure the health and safety of workers in the workplace. Here are some of the obligations of company owners and employees in relation to this act: Company owners: Develop and implement a health and safetyRead more
The Health and Safety Act is a law that sets out the obligations of employers and employees to ensure the health and safety of workers in the workplace. Here are some of the obligations of company owners and employees in relation to this act:
Company owners:
Employees:
Differentiate between each of the following terms used in levelling: i) benchmark and datum surface; ii)level line and horizontal line.(6 marks)June/July 2020
(i) Benchmark and datum surface: A benchmark is a fixed point of reference used in surveying to establish a known elevation. It may be a physical mark on a permanent structure, such as a building or bridge, or it may be a mark on a survey monument. Benchmarks are used as reference points for determiRead more
(i) Benchmark and datum surface:
(ii) Level line and horizontal line: