Questions and Answers
What is the usual cause of overheating in high speed, grease-lubricated antifriction bearings?
Faulty mounting practices
How can too much wear in gears be reduced?
Proper meshed
Why are timing belts made with teeth?
Doesn't slip
What is the purpose of the insert, or spider, used in flexible jaw couplings?
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What do clutches on machinery provide?
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What determines the selection of gear reducer size?
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Why do metal parts seize when there is a lack of lubrication?
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What causes lubrication oil to get milky?
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Why are heavy oils used?
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What is viscosity?
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Which machine condition can be determined by using oil analysis?
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Acids that form in lubricants affecting performance are a result of?
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What will shutting the fluid discharge of an air-operated reciprocating pump cause?
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What is the pressure on a fluid?
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What can you use to meet peak hydraulic system demands?
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Pressure in the hydraulic system can be controlled electrically by the use of?
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Hydraulic valves are typically adjusted by?
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Why can hydraulic reservoir suction lines be raised?
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When air is compressed, what else increases besides temperature?
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What determines the speed of a piston?
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What controls the safe operating speed of an air motor?
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Where should air line filters and lubricators be installed?
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If a solenoid valve fails to open, what should you check?
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What can result from cavitation in centrifugal pumps?
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What can cause a compressor to run too hot?
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What can a pilot flame detector indicate?
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Air cooled condensers generally have?
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What tool is used to measure threads?
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How do you put a bearing onto a shaft?
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What is the main purpose of a rectifier?
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What do variable frequency drives control?
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What does regulation of a power supply refer to?
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What are the four basic components of control systems?
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What device does not require an analog input module on a PLC?
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What is the final element in a control loop?
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What does an I/P transducer convert?
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What is the first thing to do after you Meg a motor?
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What is a Megger?
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What is trending?
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Study Notes
Overheating and Gears
- Overheating in high-speed, grease-lubricated antifriction bearings typically results from faulty mounting practices.
- Proper gear meshing can significantly reduce wear on gears.
Timing Belts and Couplings
- Timing belts are designed with teeth to prevent slipping during operation.
- The insert, or spider, in flexible jaw couplings transmits torque while accommodating misalignment.
Machinery and Power Control
- Clutches in machinery are used to disengage components and can also interrupt the power supply.
- The size selection of a gear reducer depends on the required torque and speed.
Lubrication and Oil Analysis
- Metal parts may seize due to lack of lubrication, leading to direct metal-to-metal contact.
- Lubrication oil can become milky due to mixing incompatible oils or contamination from external sources.
- Heavy oils are utilized to minimize friction caused by heat and wear.
- Viscosity measures a liquid's resistance to flow and affects lubrication performance.
Fluid Dynamics and Pump Operations
- Oil analysis can identify various wear types in machinery, allowing preemptive corrective measures.
- Acids forming in lubricants due to oxygen and high temperatures can adversely affect performance.
- Shutting off fluid discharge from an air-operated reciprocating pump may cause the pump to overstroke.
- Pressure in a fluid is defined as the measurement of force exerted per unit area.
Hydraulic Systems and Control
- Variable displacement pumps can meet peak demands in hydraulic systems.
- Hydraulic system pressure can be controlled electrically by adjusting fluid flow.
- Flow control valves in hydraulic systems facilitate the adjustment and management of pressure.
Air Compression and Piston Speed
- Compressing air increases both its temperature and pressure.
- The speed of a piston is influenced by the crankshaft stroke and engine RPM.
Air Motors and Filtration
- Safe operational speed for air motors is regulated by air supply pressure.
- Air line filters and lubricators should be positioned close to their point of use for optimal effectiveness.
Mechanical Failures and Pumps
- When a solenoid valve fails to open, checking if it is normally closed can be a solution.
- Cavitation in centrifugal pumps can lead to performance deterioration, mechanical damage, along with noise and vibration.
- High running temperatures in compressors may indicate internal moisture and condensation issues.
Control Systems and Measurements
- A pilot flame detector ensures that the flame is genuinely lit.
- Air-cooled condensers generally use fans to facilitate ambient air cooling.
- Screw gauges and thread gauges are tools used for measuring threads.
Bearings and Power Conversion
- A press fit is the recommended method for installing bearings onto shafts.
- Rectifiers primarily convert alternating current (AC) to direct current (DC).
- Variable frequency drives regulate AC motor speed by varying frequency outputs.
Control Loop Components
- Regulation of a power supply focuses on its output stability.
- Control systems incorporate four essential components: controller, amplifier, actuator, and feedback mechanism.
- Thermocouples do not require an analog input module on a PLC for operation.
- The final element in a control loop is typically the control valve.
Signal Conversion and Motor Testing
- I/P transducers convert electronic signals from control systems into pneumatic signals for valve control.
- After measuring insulation resistance with a megohmmeter, the first action should be to disconnect the power supply.
- A Megger is the instrument used for measuring the resistance of electrical insulation.
Trending and Diagnostics
- Trending refers to observing the general direction of changes in process data over time, which aids in diagnostics.
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Test your knowledge on mechanical engineering concepts with these flashcards. Each card covers important definitions and principles related to bearings, gears, and couplings. Ideal for students and professionals looking to refresh their understanding of the subject.