Mechanical Systems and Maintenance Quiz

The angle of the skirt board is incorrect, causing material to fall off at the unloading point.

The '70' in a welding electrode label indicates the tensile strength of the weld in pounds per square inch (PSI).

A 'K' type bearing is a needle roller bearing, known for its high radial load capacity.

The reading on the 2-3 inch depth micrometer in Fig 8 is 2.182 inches.

When excessive Chromium is found during oil analysis, it usually indicates bearing failure. The metal particles from the worn bearing contaminate the oil.

If a conveyor is moving sideways despite no load, the problem most likely lies in the alignment of the head pulley. Adjust the head pulley to correct the off-center movement.

The standard angle for a twist drill bit is 118 degrees. This specific angle helps create a strong and consistent cutting action.

A prick punch typically has an angle of 30-60 degrees. This angle allows for a precise marking of the metal surface before drilling.

The process of a liquid flow becoming turbulent due to excessive fittings, leading to increased energy loss and potential damage to the hydraulic system.

Reducing the number of fittings in a hydraulic system can help minimize turbulence and promote smoother, more laminar flow.

A throttled valve can control the flow rate of a fluid, helping to reduce turbulence and create more laminar flow.

Air starvation in a pneumatic system occurs when there is insufficient air supply to the downstream components, resulting in reduced performance or malfunction.

Increasing the diameter of pipes in a pneumatic system can enhance airflow and reduce the risk of air starvation by lowering pressure drops.

Using predictive maintenance programs involves analyzing historical data and current sensor readings to anticipate potential mechanical problems before they occur.

Sealed bearings are commonly used in electric motors, particularly those with enclosed housings, to prevent contamination and ensure proper lubrication.

The key slot in a stepped shaft is a critical feature for aligning components, and filling it with grease ensures proper lubrication and prevents damage during bearing installation.

A document confirming the delivery of goods to a specific work site.

A safety mechanism that shuts down a steam turbine when its speed exceeds a predetermined limit, protecting the turbine from damage.

The process of replacing a leaking shaft seal in a gearbox, typically involving removing the old seal and installing a new one.

The first step in aligning rotating machinery is to gather the necessary tools, ensuring that all equipment and materials are available for the alignment process.

A solution for excessive clearance in a coupling connecting two shafts, involving replacing the entire coupling or specific components to restore the desired fit.

Adjustments to a V-belt's alignment and tension can resolve the issue of the belt jumping off the sheave, ensuring proper function and preventing wear.

The correct procedure for starting gas cutting with an oxy-acetylene torch involves opening the oxygen valve first, followed by partially opening the acetylene valve, igniting the torch, and then adjusting the flame.

When opening an oxygen valve for an oxyacetylene torch, the main cylinder valve should be fully opened first, followed by adjusting the oxygen regulator and finally opening the torch oxygen valve.

A contactless seal prevents direct physical contact between the rotating shaft and the stationary housing, reducing friction and wear. This type of seal relies on barriers like labyrinth paths or magnetic fields to create a seal.

The steps involved in replacing an unloading valve typically include isolation, workspace preparation, removal of the old valve, inspection and cleaning, installation of the new valve, re-energizing the system, and finally verification of proper operation.

Rough alignment is the initial step in laser alignment, aimed at bringing the two shafts roughly in line before proceeding with precise adjustments.

Sensatory NDT (Non-Destructive Testing) methods utilize various sensing techniques, such as vibration, visual inspection, and ultrasonic sound, to examine components without causing damage.

Setting up equipment outdoors requires a systematic approach, including preparing the base, cleaning the surrounding area, putting the equipment in place, and adding barricades for safety.

Increasing the diameter of the pipe will increase the flow rate in a hydraulic system, allowing more fluid to pass through.

To move a 500 lb load with a 4-inch cylinder, the required PSI (pounds per square inch) is calculated by dividing the load by the cylinder's area. In this case, the needed PSI would be 50 psi.

Tightening bolts in a star pattern ensures even distribution of force, preventing warping or stress concentration on the component. Tighten each bolt incrementally to the specified torque, rotating in a star pattern until the desired torque is reached.

A safety procedure used to isolate equipment from power sources before maintenance or repair.

The process of removing air or other gases from a system or equipment.

A hitch that uses two legs of a sling wrapped around a load, forming a basket shape.

The minimum and maximum slack allowed in horizontal chain drives to prevent chain wear and damage.

A document used to record the operating history of a machine, including maintenance and repairs.

A maintenance approach that aims to identify potential failures before they occur.

A maintenance procedure that involves shutting down equipment and removing its cover for cleaning and inspection.

A method used to check the condition of gear teeth for irregularities or damage.

A pressure reducing valve regulates the pressure of a fluid flowing through it. It lowers high pressure to a desired lower pressure.

A pressure relief valve is a safety device that prevents excessive pressure build-up in a system. It opens automatically when the pressure exceeds a defined limit, releasing excess fluid to protect components.

Cushion adjustment refers to controlling the rate at which a valve opens or closes. This helps prevent abrupt pressure changes and damage to the system.

A free check valve allows fluid to flow in only one direction. It prevents backflow and ensures unidirectional movement.

A motor running hot can be caused by low voltage. Insufficient voltage can overload the motor, causing it to overheat.

The unit of velocity is distance traveled per unit time. Common units include inches per second (in/sec) or millimeters per second (mm/sec).

Air starvation in an air compressor happens when there's insufficient air intake. This can be caused by a clogged air filter restricting airflow.

Replacing a pyrometer in a steam turbine requires following safety procedures: lock out the system, isolate the steam, replace the pyrometer, test its performance, and then inform the supervisor.