Engineering Jobs | Interview Questions and Technology update

🔧 Post Content: If you're working in maintenance, production, or reliability engineering — these tools aren’t optional anymore, they’re essential. Whether you're solving unexpected breakdowns or planning preventive maintenance, knowing the right tool for the right situation can save time, cost, and chaos. Here’s a crisp list of 25 key tools and techniques used across the industry: ✅ Maintenance Tools & Techniques List: Why-Why Analysis Root Cause Analysis (RCA) Failure Modes and Effects Analysis (FMEA) Fault Tree Analysis (FTA) Pareto Analysis Fishbone Diagram (Ishikawa) Condition Monitoring Predictive Maintenance (PdM) Preventive Maintenance (PM) Reliability-Centered Maintenance (RCM) Total Productive Maintenance (TPM) MTBF (Mean Time Between Failures) MTTR (Mean Time to Repair) 5S Methodology Kaizen PDCA Cycle (Plan-Do-Check-Act) CMMS (Computerized Maintenance Management System) Vibration Analysis Thermography Oil ...

Mechanical Causes : -  1. Air Intake Restriction: A clogged or restricted air filter can limit the amount of air entering the engine. This reduction in airflow can lead to lower air manifold pressure. 2. Turbocharger Issues: If the diesel engine is equipped with a turbocharger, issues such as a malfunctioning wastegate, a damaged turbocharger compressor, or excessive carbon buildup can affect the boost pressure and result in low air manifold pressure. 3. Exhaust Restriction: A blocked exhaust system, such as a clogged catalytic converter or a blocked muffler, can create backpressure in the exhaust system and hinder the flow of exhaust gases, affecting the turbocharger's efficiency and thus the air manifold pressure. 4. Boost Leak: Any leaks in the intake system, such as cracked hoses, loose connections, or a leaking intercooler, can result in air escaping before reaching the engine's cylinders, leading to reduced air manifold pressure. 5. Malfunctioning Sensors: Faulty sen...

Yes, there is a potential relation between maintaining negative Crankcase Over Pressure (COP) and engine safety, including the prevention of engine failures or "engine blast." When the COP is excessively positive (positive pressure in the crankcase), several issues can arise that might contribute to engine failures or catastrophic events like an "engine blast": 1. Oil Leaks: High COP can cause increased pressure inside the crankcase, forcing oil past seals and gaskets, leading to oil leaks. Leaked oil can reach hot engine components, creating a fire hazard. 2. Piston Ring Failure: Excessive COP can lead to increased blow-by, where combustion gases leak past the piston rings and enter the crankcase. This can result in poor engine performance, increased oil consumption, and potential damage to the piston rings. 3. Hydrolock: If enough unburned fuel and exhaust gases accumulate in the crankcase due to high COP, it can lead to a condition known as hydrolock. Hydrolock ...

Definition : -  Engine crankcase pressure is negative because of the design of the engine. The pistons in the engine move up and down in the cylinders, creating pressure changes. The pressure in the crankcase is lower than the atmospheric pressure outside of the engine. This is due to the design of the crankcase ventilation system , which allows for the escape of any gases that may build up in the crankcase. This helps to prevent the engine from overheating, and also helps to reduce the amount of oil that is consumed by the engine. Maintaining a slight negative pressure is crucial for several reasons: 1. Preventing Oil Leaks: Negative crankcase pressure helps prevent oil leaks from various seals and gaskets. When the crankcase is under negative pressure, it discourages the oil from seeping out through small gaps and seals, which can otherwise lead to oil leaks and potential contamination of other engine components. 2. Reducing Blow-by: A slight negative pressure in the crankcase ...

High crankcase pressure in a locomotive diesel engine can indicate various underlying issues. It is essential to address this problem promptly to prevent potential damage and ensure the engine's proper functioning.  Some possible causes of high crankcase pressure in a locomotive diesel engine include: 1. Worn Piston Rings: Piston rings create a seal between the piston and the cylinder wall, preventing combustion gases from entering the crankcase. Over time, piston rings can wear out or become damaged, leading to gas leakage into the crankcase and increased pressure. 2. Clogged or Faulty Positive Crankcase Ventilation (PCV) System: The PCV system is responsible for controlling and regulating crankcase pressure by venting gases from the crankcase to the engine's intake manifold, where they are burned during combustion. If the PCV system becomes clogged or malfunctions, it can't effectively vent the gases, resulting in increased pressure. 3. Faulty Breather System: The breathe...

Here's a comprehensive list of major and minor components in an electric locomotive: Major Components: 1. Traction Motors: Electric motors responsible for driving the locomotive's wheels. 2. Pantograph: An apparatus mounted on the roof to collect electric power from overhead wires (catenary) or third rails. 3. Transformer: Converts the high-voltage AC power from the catenary or third rail into a lower voltage suitable for the locomotive's electrical system. 4. Rectifier: Converts the AC power from the transformer into DC power to operate the traction motors. 5. Control System: Manages the locomotive's speed, direction, and other operational functions. 6. Bogies: Undercarriage frames that support and connect the locomotive's wheels to the main body. 7. Wheelsets: Sets of wheels connected to the axles on the bogies. 8. Brake System: Includes various types of brakes, such as regenerative brakes, dynamic brakes, and mechanical brakes, to control the locomotive'...

A locomotive diesel engine consists of numerous major and minor components that work together to power the locomotive and enable it to haul trains. Here's a comprehensive list of these components: Major Components: 1. Cylinder Block 2. Cylinder Head 3. Pistons 4. Piston Rings 5. Connecting Rods 6. Crankshaft 7. Camshaft 8. Cylinder Liners 9. Turbocharger 10. Fuel Injection System (including injectors and fuel pump) 11. Air Intake System (including air filters) 12. Exhaust System (including exhaust manifold and muffler) 13. Lubrication System (including oil pump and oil filters) 14. Cooling System (including radiator, water pump, and thermostat) 15. Governor (to control engine speed) 16. Flywheel 17. Engine Mounts Minor Components: 1. Valve Train (valves, valve springs, pushrods, rocker arms) 2. Glow Plugs (for cold starting in some diesel engines) 3. Glow Plug Controller 4. Timing Belt or Chain 5. Belt Tensioner 6. Tensioner Pulley 7. Alternator 8. Starter Motor 9. Voltage Regulato...

Diesel engines are robust and reliable machines, but like any mechanical system, they can experience various failures over time. Some of the common failures that can occur in a diesel engine include: 1. Fuel System Problems: Fuel Injector Issues: Clogging, leaking, or malfunctioning injectors can cause poor fuel spray patterns and reduced engine performance. Fuel Pump Failure: A failing fuel pump can result in inadequate fuel delivery, leading to loss of power or stalling. Fuel Filter Blockage: A clogged fuel filter restricts fuel flow and can cause engine misfires and reduced power. 2. Engine Overheating: Cooling System Failures: Issues with the cooling system, such as a malfunctioning thermostat, water pump, or radiator, can lead to engine overheating and potential damage. Diesel engines are more prone to overheating than gasoline engines. This is because diesel fuel burns at a higher temperature than gasoline fuel. If the engine overheats, it can cause the seals ...

If water is found in the fuel of a locomotive engine, it can have several adverse effects on the engine's performance and overall operation. Water in the fuel can lead to various issues, some of which include: 1. Reduced Combustion Efficiency: Water does not burn like diesel or other fuel components, and when it enters the combustion chamber, it can interfere with the combustion process. This leads to incomplete combustion, reduced power output, and decreased fuel efficiency. 2. Corrosion and Wear: Water can cause corrosion and wear in the fuel system components, such as fuel lines, injectors, and fuel pumps. Over time, this can lead to fuel system damage, leaks, and decreased engine performance. 3. Fuel Injector Clogging: Water can cause the fuel injectors to clog or malfunction. This disrupts the proper spray pattern of fuel into the combustion chamber, affecting the air-fuel mixture and leading to poor engine performance and rough idling. 4. Increased Emissions: In...

Efficiency and effectiveness are two important concepts in business and management. They are often confused, but they have slightly different meanings 1. Efficiency: Efficiency refers to the ability to accomplish a task or achieve a goal with minimum waste of resources, time, effort, or cost. It is about maximizing output while minimizing input. In other words, efficiency focuses on how well resources are utilized to produce the desired result. A process or system is considered efficient when it can produce more output with the same or fewer resources or produce the same output with fewer resources. Example: In a manufacturing plant, an efficient production process would mean producing a higher number of units with the same amount of raw materials and labor hours. 2. Effectiveness: Effectiveness, on the other hand, refers to the extent to which a task or goal is achieved and the ability to produce the desired results. It is about the degree of success in achieving the inte...