700+ Maintenance Engineer Interview Questions and Answers

A preventive maintenance check sheet for a hydraulic power pack includes inspecting fluid levels, checking for leaks, testing pressure levels, and examining filters.

• Inspect fluid levels and top up if necessary

• Check for leaks in hoses and connections

• Test pressure levels to ensure they are within specified range

• Examine filters and replace if dirty or clogged

Calibration of I/P converter involves adjusting the output pressure to match the input signal.

• Connect the I/P converter to a pressure source and a signal generator

• Adjust the input signal to the desired value

• Measure the output pressure and adjust it to match the input signal

• Repeat the process at different input signal levels to ensure accuracy

• Document the calibration results for future reference

The mechanical engineering career goal objectives in Mylan are focused on ensuring efficient maintenance operations and improving equipment reliability.

• Developing and implementing preventive maintenance programs to minimize downtime

• Identifying and resolving equipment malfunctions to optimize production

• Collaborating with cross-functional teams to improve equipment design and performance

• Implementing cost-saving initiatives through energy-efficient practices

• Continuously learning...read more

Soda Ash related equipment includes conveyors, crushers, screens, and calciners used in the production of sodium carbonate.

• Conveyors are used to transport raw materials and finished products.

• Crushers are used to break down large chunks of soda ash into smaller pieces.

• Screens are used to separate different sizes of soda ash particles.

• Calciners are used to heat and convert sodium bicarbonate into sodium carbonate.

• Examples of soda ash related equipment include belt conveyors, sc...read more

Maintenance has several benefits including increased equipment lifespan, improved safety, reduced downtime, and cost savings.

• Increased equipment lifespan: Regular maintenance helps identify and address issues before they become major problems, extending the lifespan of equipment.

• Improved safety: Maintenance ensures that equipment is functioning properly, reducing the risk of accidents and injuries.

• Reduced downtime: Regular maintenance minimizes unexpected breakdowns and repai...read more

DC supply can be converted into AC supply using an inverter.

• Inverter is an electronic device that converts DC to AC.

• It uses a switching circuit to alternate the polarity of DC voltage.

• The output waveform can be modified using filters and transformers.

• Examples of inverters include square wave, modified sine wave, and pure sine wave inverters.

Experience in a company's category and efficient knowledge are equally important for a maintenance engineer.

• Experience in the same industry as the company can help in understanding the specific maintenance needs.

• Efficient knowledge of maintenance techniques and equipment is crucial for effective maintenance.

• Experience in implementing preventive maintenance programs can help reduce downtime and increase equipment lifespan.

Robots use sensors and algorithms to memorize their origin and moving positions.

• Robots use sensors such as encoders, accelerometers, and gyroscopes to determine their position and orientation.

• Algorithms such as SLAM (Simultaneous Localization and Mapping) are used to create a map of the robot's environment and track its movements.

• Once the robot has determined its origin position, it can use relative positioning to move to other positions.

• Some robots also use markers or beacon...read more

Different types of gears include spur gears, helical gears, bevel gears, worm gears, and rack and pinion gears.

• Spur gears have straight teeth and are the simplest and most common type of gear.

• Helical gears have angled teeth and provide smoother and quieter operation compared to spur gears.

• Bevel gears have cone-shaped teeth and are used to transmit power between intersecting shafts.

• Worm gears consist of a worm and a worm wheel and are used for high reduction ratios and self-lo...read more

MTTR measures repair time, while MTBF assesses the reliability of systems by tracking failure intervals.

• MTTR (Mean Time to Repair) is the average time taken to repair a system after a failure occurs.

• MTBF (Mean Time Between Failures) is the average time between consecutive failures of a system during operation.

• For example, if a machine fails and takes 2 hours to repair, and it operates for 100 hours before failing again, MTTR is 2 hours and MTBF is 100 hours.

• MTTR helps in unde...read more

BT40 and BT50 are terms used in the field of machining and refer to the type of tool holder used in CNC machines.

• BT40 and BT50 are standardized tool holder systems used in CNC machining.

• They are named after the taper size of the tool holder, which determines the compatibility with the machine spindle.

• BT40 has a taper size of 40 and BT50 has a taper size of 50.

• The tool holders are used to securely hold cutting tools in the machine spindle.

• Different tool holders are required fo...read more

In house wiring, we use alternating current (AC) power.

• AC power is used in most homes and buildings for lighting, appliances, and other electrical needs.

• The voltage used in house wiring is typically 120 or 240 volts, depending on the country and region.

• Wiring is typically done with copper or aluminum conductors, and is protected by circuit breakers or fuses.

• Grounding is an important safety feature in house wiring, providing a path for excess current to flow to the earth.

• Diffe...read more

A diode is an electronic component that allows current to flow in only one direction. To check if it's ok, use a multimeter in diode mode.

• A diode has two terminals: an anode and a cathode

• When forward-biased, a diode allows current to flow through it

• When reverse-biased, a diode blocks current flow

• To check if a diode is ok, use a multimeter in diode mode and measure the voltage drop across the diode

• A good diode will have a voltage drop of around 0.6-0.7V

A PM check sheet for a compressor is a document outlining scheduled maintenance tasks to prevent breakdowns and ensure optimal performance.

• Includes tasks such as checking oil levels, inspecting filters, testing safety features

• Helps identify potential issues before they become major problems

• Ensures compressor operates efficiently and extends its lifespan

Yes, I have knowledge and experience in welding, grinding, and cutting.

• I have completed a welding course and have experience in MIG, TIG, and stick welding.

• I am proficient in using various cutting tools such as plasma cutters, saws, and torches.

• I have experience in grinding and polishing metal surfaces to a smooth finish.

• I am familiar with safety procedures and protocols when working with these tools.

The main problem in CNC machines is tool wear and breakage.

• Tool wear and breakage can lead to poor quality of machined parts.

• It can also cause machine downtime and increased maintenance costs.

• Regular monitoring and replacement of tools is necessary to prevent these issues.

• Improper tool selection or incorrect machining parameters can contribute to tool wear and breakage.

• Examples of tool wear include flank wear, crater wear, and chipping.

The principle of a motor is the conversion of electrical energy into mechanical energy.

• Motors work based on the principle of electromagnetic induction.

• When an electric current flows through a wire in the presence of a magnetic field, a force is exerted on the wire, causing it to move.

• This movement is used to generate mechanical energy, which can be used to perform work.

• Motors can be found in various applications such as electric vehicles, industrial machinery, and household a...read more

Gearbox overhauling involves disassembling, inspecting, repairing, and reassembling the gearbox to ensure optimal performance.

• Start by draining the gearbox oil and removing the gearbox from the equipment.

• Disassemble the gearbox carefully, noting the position of each component for reassembly.

• Inspect all parts for wear, damage, or signs of malfunction.

• Replace any worn or damaged parts with new ones.

• Clean all components thoroughly before reassembly.

• Reassemble the gearbox followi...read more

To work a fire engine with high pressure, ensure proper training, follow safety protocols, adjust pressure settings, and use appropriate nozzles.

• Ensure proper training on how to operate the fire engine with high pressure

• Follow safety protocols to prevent accidents and injuries

• Adjust pressure settings according to the specific situation and requirements

• Use appropriate nozzles to control the flow and direction of water

• Regularly maintain and inspect the fire engine to ensure it ...read more

PT, LT and LVDT are types of sensors used in engineering for measuring pressure, temperature and displacement respectively.

• PT stands for Pressure Transducer and is used to measure pressure in various applications such as hydraulic systems, engines, and pipelines.

• LT stands for Linear Transducer and is used to measure temperature in various applications such as engines, HVAC systems, and industrial processes.

• LVDT stands for Linear Variable Differential Transformer and is used t...read more

Flow in a pipe is the movement of fluid through the pipe. It can be calculated using the formula Q = A * V, where Q is the flow rate, A is the cross-sectional area of the pipe, and V is the velocity of the fluid.

• Flow in a pipe refers to the volume of fluid passing through the pipe per unit time.

• To calculate flow in a given size of pipe, you can use the formula Q = A * V, where Q is the flow rate, A is the cross-sectional area of the pipe, and V is the velocity of the fluid.

• Th...read more

Types of lagging, use of ZSS proxy, and process of belt joint are important for maintenance engineers.

• Types of lagging include ceramic, rubber, and polyurethane.

• ZSS proxy is used for remote monitoring and control of equipment.

• Process of belt joint involves preparing the belt ends, applying adhesive, and pressing the ends together.

7QC tools are quality control tools used to identify and solve quality-related issues. MTTR stands for Mean Time To Repair, MTBF stands for Mean Time Between Failures.

• 7QC tools include Pareto analysis, cause-and-effect diagram, scatter diagram, etc.

• MTTR is the average time taken to repair a failed component or system.

• MTBF is the average time between failures of a component or system.

• Types of breakdowns can include mechanical, electrical, software, etc.

• Types of failures can in...read more

The efficiency of a turbine is less due to various factors such as friction, heat losses, and mechanical losses.

• Friction between the moving parts of the turbine reduces its efficiency.

• Heat losses occur due to the conversion of thermal energy into mechanical energy.

• Mechanical losses include losses in bearings, seals, and other components.

• Efficiency equation: Efficiency = (Useful output energy / Input energy) * 100%

Answering questions related to difficult maintenance activities and troubleshooting DE system issues.

• Performed difficult maintenance activities such as replacing a faulty gearbox in a wind turbine

• To physically find out if DE system is jammed, I would inspect the system for any blockages or obstructions

• If the bag on DE system is torn, I would conduct a visual inspection and check for any leaks or tears in the bag

To check machine backlash in a CNC machine, perform a backlash test by moving the machine's axis in both directions and measuring the difference in position.

• Perform a backlash test by moving the machine's axis in one direction and measuring the position

• Then move the axis in the opposite direction and measure the position again

• Calculate the difference in position to determine the backlash

• Repeat the test for each axis of the CNC machine

• Adjust the machine's backlash compensation...read more

Life of equipment refers to the duration of time that the equipment can function effectively and efficiently.

• The life of equipment is determined by various factors such as usage, maintenance, and environmental conditions.

• Regular maintenance and timely repairs can extend the life of equipment.

• Equipment manufacturers provide an estimated lifespan for their products, but this can vary depending on usage and maintenance.

• Factors such as wear and tear, corrosion, and obsolescence c...read more