500+ Maintenance Engineer Interview Questions and Answers

Oil lubricant is used in elevators to reduce friction and wear on moving parts.

• Oil lubricant reduces friction between moving parts in elevators.

• It helps to prevent wear and tear on elevator components.

• Oil lubricant also helps to dissipate heat generated by friction.

• Different types of oil lubricants are used depending on the elevator's design and usage.

• Regular maintenance and oil changes are necessary to ensure proper elevator function.

The manufacturing process for producing a component involves several steps.

• Designing the component

• Material selection

• Machining or forming the raw material

• Assembly of the component

• Quality control and inspection

The spanner size required to remove a 12 mm bolt is typically 17 mm.

• The spanner size needed is usually 5 mm larger than the bolt size

• In this case, a 17 mm spanner would be required to remove a 12 mm bolt

MCB stands for Miniature Circuit Breaker. It is an electrical switch designed to protect an electrical circuit from damage caused by overload or short circuit.

• MCB is a type of circuit breaker that automatically switches off the electrical circuit when it detects an overload or short circuit.

• It is commonly used in residential and commercial buildings to protect electrical appliances and wiring from damage.

• MCBs are more compact and efficient compared to traditional fuses, as th...read more

To solve hydraulic machine breakdown, identify the root cause, inspect the system, and repair or replace the faulty components.

• Identify the root cause of the breakdown

• Inspect the hydraulic system thoroughly

• Repair or replace the faulty components

• Perform regular maintenance to prevent future breakdowns

The question seems to be a jumbled up sentence. It is not clear what is being asked.

• The question is not clear and seems to be a jumbled up sentence.

• It is difficult to understand what is being asked.

• More context is needed to answer the question.

Basic needs for maintenance of a machine include regular inspections, lubrication, cleaning, and repairs.

• Regular inspections to identify any potential issues or wear and tear.

• Proper lubrication of moving parts to reduce friction and prevent damage.

• Regular cleaning to remove dirt, dust, and debris that can affect machine performance.

• Timely repairs to address any malfunctions or breakdowns.

• Calibration and adjustment of machine settings to ensure optimal performance.

• Training and...read more

The latest motor used in elevators is the permanent magnet synchronous motor (PMSM).

• PMSM is more energy-efficient and has a higher power density than traditional motors.

• It uses rare-earth magnets to create a magnetic field that rotates the motor shaft.

• PMSM is also quieter and requires less maintenance than other motors.

• Examples of elevators that use PMSM include Otis Gen2 and KONE MonoSpace 500.

Yes, jigs and fixtures are tools used in manufacturing to ensure consistent and accurate production of parts.

• Jigs are used to guide tools and control the motion of the workpiece during manufacturing.

• Fixtures are used to hold the workpiece in place and provide stability during machining.

• Knowledge of jigs and fixtures is essential for ensuring quality and efficiency in manufacturing processes.

• Examples include welding jigs for assembling metal parts and drill fixtures for precis...read more

Hunting in DG sets is caused by the engine's inability to maintain a constant speed due to variations in load.

• Hunting occurs when the engine alternates between overspeed and underspeed conditions.

• It can be caused by sudden changes in load demand or improper fuel/air mixture.

• Hunting can lead to inefficient operation, increased fuel consumption, and potential damage to the engine.

• Regular maintenance and tuning can help reduce hunting in DG sets.

Utility and process equipment capacity and make

• Provide details of all utility and process equipment installed in the facility

• Include information on their capacity and make

• Utility equipment may include HVAC, compressed air, water treatment, etc.

• Process equipment may include reactors, distillation columns, pumps, etc.

Backless is not a technical term. PLC stands for Programmable Logic Controller. Ladder is used for programming PLCs.

• Backless is not a technical term used in maintenance engineering.

• PLC stands for Programmable Logic Controller, a digital computer used for automation of electromechanical processes.

• Ladder logic is a programming language used to program PLCs.

• Ladder logic is called so because it resembles a ladder with two vertical rails and rungs in between.

• Ladder logic is easy t...read more

I can perform routine equipment inspections, lubrication, and minor repairs by hand.

• Performing visual inspections to identify any signs of wear or damage

• Applying lubricants to moving parts to ensure smooth operation

• Replacing worn-out parts such as belts or filters

• Tightening loose bolts or screws

• Cleaning equipment to prevent buildup of debris or dirt

Handling manpower involves effective communication, delegation, training, and problem-solving skills to ensure smooth machine operation.

• Effective communication with the team to understand their strengths and weaknesses

• Delegating tasks based on individual skills and experience

• Providing necessary training to enhance skills and knowledge

• Implementing problem-solving techniques to address machine issues promptly

• Regularly monitoring and evaluating the performance of both manpower a...read more

Production losses can be minimized by implementing preventive maintenance strategies, improving equipment reliability, and optimizing production processes.

• Implementing a proactive maintenance schedule to prevent breakdowns and minimize downtime

• Regularly monitoring equipment performance and conducting predictive maintenance to address issues before they escalate

• Investing in training for maintenance staff to improve their skills and efficiency

• Utilizing technology such as sensor...read more

Preventive maintenance involves scheduled inspections and repairs to prevent equipment failure. MTTR and MTBF are used to measure equipment reliability. PLC interlock with ladder logic ensures safe operation.

• Preventive maintenance involves regular inspections and repairs to prevent equipment failure

• MTTR (Mean Time to Repair) measures the average time it takes to repair equipment

• MTBF (Mean Time Between Failures) measures the average time between equipment failures

• PLC (Programm...read more

Mechanical seals can be installed on reactors by following a specific procedure.

• Ensure the reactor is clean and free of debris

• Select the appropriate mechanical seal based on the reactor's specifications

• Install the seal according to the manufacturer's instructions

• Check for leaks and make necessary adjustments

• Perform regular maintenance to ensure the seal continues to function properly

A cooling tower is a device that removes heat from a process or building by transferring it to the atmosphere.

• Cooling towers are commonly used in industrial processes and HVAC systems.

• They work by evaporating a small portion of the water being circulated, which removes heat from the remaining water.

• The cooled water is then recirculated back into the system.

• Cooling towers can be classified into different types, such as natural draft, forced draft, and induced draft towers.

• Exam...read more

A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.

• Compressors are used in various industries such as refrigeration, air conditioning, and gas processing.

• They come in different types such as reciprocating, rotary, and centrifugal compressors.

• The unit of a compressor is typically measured in cubic feet per minute (CFM) or liters per minute (LPM).

The question is testing the candidate's knowledge of present simple and present continuous tenses.

• Present Simple is used for general truths, habits, and routines.

• Present Continuous is used for actions happening now or around the present moment.

• Examples: 'He cares for the equipment regularly.' (Present Simple) 'He is currently calling the supplier for spare parts.' (Present Continuous)

PLC stands for Programmable Logic Controller. It is a digital computer used for automation of electromechanical processes.

• PLC is used to control and monitor industrial processes such as assembly lines, robotic devices, and machinery.

• It is programmed using ladder logic or other programming languages.

• There are various types of PLCs such as Siemens, Allen Bradley, Mitsubishi, etc.

• PLCs are used in various industries such as manufacturing, automotive, food and beverage, and more.

Hydraulic press offers higher force and control, while mechanical press is faster and more efficient.

• Hydraulic press uses hydraulic fluid to generate force, while mechanical press uses mechanical force.

• Hydraulic press offers higher force and control, making it suitable for heavy-duty applications like metal forming and forging.

• Mechanical press is faster and more efficient, making it suitable for high-volume production of smaller parts.

• Hydraulic press is more expensive and req...read more

Pumps are devices used to move fluids from one place to another. There are different types of pumps based on their working principle.

• Centrifugal pumps

• Positive displacement pumps

• Axial flow pumps

• Mixed flow pumps

• Jet pumps

Maintenance procedure involves regular inspection, cleaning, repair and replacement of equipment to ensure optimal performance and prevent breakdowns.

• Create a maintenance schedule based on manufacturer recommendations and equipment usage

• Perform regular inspections to identify potential issues before they become major problems

• Clean and lubricate equipment as needed to prevent wear and tear

• Repair or replace damaged or worn parts promptly to prevent further damage

• Document all ma...read more

There are mainly two types of bearings used in ball screw assembly - angular contact bearings and deep groove radial bearings.

• Angular contact bearings are used to support axial loads and are designed to withstand high thrust loads in one direction.

• Deep groove radial bearings are used to support radial loads and are designed to withstand high radial loads.

• The selection of bearing type depends on the application and load requirements.

• Some common examples of bearing manufacturer...read more

HMI is the interface between a human operator and a machine that allows for control and monitoring of the machine's functions.

• HMI is used in various industries such as manufacturing, transportation, and energy

• It includes components such as touchscreens, buttons, and indicators

• HMI can display real-time data and provide alerts for potential issues

• Examples of HMI include the dashboard in a car and the control panel in a factory

Pumps are selected based on the required flow rate, head, and fluid properties.

• Determine the required flow rate and head for the application

• Consider the fluid properties such as viscosity, temperature, and corrosiveness

• Select a pump type that is suitable for the application, such as centrifugal, positive displacement, or axial flow

• Choose a pump material that is compatible with the fluid being pumped

• Consider the operating conditions, such as suction lift, NPSH, and system pres...read more

I follow a systematic approach to execute breakdown of equipment.

• First, I identify the cause of the breakdown and assess the extent of damage.

• Then, I refer to the equipment manual and troubleshoot the issue.

• If necessary, I consult with other maintenance personnel or engineers.

• I prioritize the repairs based on the impact on production and safety.

• Finally, I execute the repairs and conduct tests to ensure the equipment is functioning properly.

• I also document the entire process f...read more

A mechanical seal is a device that helps to prevent leakage between two moving parts in a machine.

• There are several types of mechanical seals, including pusher, non-pusher, cartridge, and split seals.

• Pusher seals use springs to maintain contact between the seal faces.

• Non-pusher seals use the pressure of the fluid being sealed to maintain contact between the seal faces.

• Cartridge seals are pre-assembled and can be easily replaced without disassembling the equipment.

• Split seals ...read more

No, NC stands for Normally Open and Normally Closed.

• No, NC are terms used in electrical circuits.

• No refers to Normally Open, which means the circuit is open when there is no current flowing through it.

• NC refers to Normally Closed, which means the circuit is closed when there is no current flowing through it.

• These terms are commonly used in relays, switches, and other electrical components.

• Understanding No, NC is important for troubleshooting and maintenance of electrical syst...read more

My areas of interest include electrical systems, mechanical systems, and preventive maintenance.

• Electrical systems: I have a strong interest in troubleshooting and repairing electrical systems, such as motors, control panels, and wiring.

• Mechanical systems: I enjoy working with mechanical components, such as pumps, valves, and conveyors. I have experience in maintaining and repairing these systems.

• Preventive maintenance: I believe in the importance of regular inspections and m...read more

Corrosion allowance is the additional thickness of material added to the original thickness of a metal to prevent corrosion.

• It is a safety margin added to the thickness of metal to prevent corrosion

• It is usually expressed in millimeters or inches

• The amount of corrosion allowance depends on the type of metal, the environment it is exposed to, and the expected lifespan of the equipment

• For example, a pipeline carrying corrosive fluids may have a corrosion allowance of 3mm to 5mm...read more

Statutory compliance refers to the legal requirements that organizations must adhere to in order to operate within the law.

• It includes following laws and regulations related to labor, environment, health and safety, taxation, and more

• Non-compliance can result in penalties, fines, legal action, and damage to reputation

• Examples of statutory compliance include filing tax returns, obtaining necessary licenses and permits, and maintaining accurate records

• Regular audits and inspect...read more

Erection and commissioning of a pneumatic compressor involves assembling the components, connecting the necessary piping, testing for functionality, and fine-tuning for optimal performance.

• Assemble the components of the pneumatic compressor according to the manufacturer's instructions.

• Connect the necessary piping for air intake, compression, and output.

• Test the compressor for functionality by running it empty and checking for any leaks or abnormal noises.

• Fine-tune the compres...read more

Motor coil condition can be checked by measuring the resistance and insulation resistance.

• Measure the resistance of each coil using a multimeter.

• Compare the measured resistance with the manufacturer's specifications.

• Measure the insulation resistance between the coil and the motor frame using a megohmmeter.

• Check for any signs of physical damage or wear on the coils.

• Perform a visual inspection of the motor windings for any signs of discoloration or burning.

• Check for any abnorma...read more

There are various types of pumps used in engineering, including centrifugal pumps, reciprocating pumps, and rotary pumps.

• Centrifugal pumps are commonly used for transferring fluids by converting rotational energy into kinetic energy.

• Reciprocating pumps use a piston or plunger to create pressure and move fluid.

• Rotary pumps operate by trapping fluid between rotating components and the pump casing.

• Other types of pumps include diaphragm pumps, gear pumps, and peristaltic pumps.

Basic knowledge of Acb, Vcb, T/F, SOP floor maintenance, UPS, and Compressor includes understanding of electrical equipment, transformers, standard operating procedures for maintenance, and backup power systems.

• Understanding of Air Circuit Breaker (ACB) and Vacuum Circuit Breaker (VCB) operation and maintenance

• Knowledge of Transformers (T/F) and their maintenance requirements

• Familiarity with Standard Operating Procedures (SOP) for floor maintenance tasks

• Understanding of Unint...read more

A toggle switch is a mechanical switch that has two positions, on and off, which are toggled by a lever or button.

• Toggle switches are commonly used in electronic devices and electrical circuits.

• They are often used to control power to a device or circuit.

• Toggle switches can be either single-pole single-throw (SPST) or double-pole double-throw (DPDT).

• SPST switches have two terminals and are used to turn a circuit on or off.

• DPDT switches have six terminals and are used to switch...read more

The hole size for an M8 bolt is typically 8.5mm to 9mm.

• The hole size for an M8 bolt is determined by the bolt's nominal diameter.

• The recommended hole size for an M8 bolt is usually 8.5mm to 9mm.

• The hole should be slightly larger than the bolt's diameter to allow for easy insertion and proper fit.

• Using a drill bit or a hole saw of the appropriate size is essential for creating the correct hole size for an M8 bolt.

MTTR is the average time to repair a failed system, while MTBF is the average time between failures.

• MTTR measures downtime and repair time, while MTBF measures reliability and uptime.

• MTTR is a measure of how quickly a system can be restored after a failure, while MTBF is a measure of how long a system can operate without failing.

• MTTR is typically used to evaluate maintenance performance, while MTBF is used to evaluate system design and reliability.

• For example, if a system has...read more

The maintenance procedure in the present organization involves regular inspections, preventive maintenance, and prompt repairs.

• Regular inspections are conducted to identify potential issues before they become major problems.

• Preventive maintenance is carried out on a scheduled basis to ensure equipment is in good working condition.

• Prompt repairs are made to minimize downtime and prevent further damage.

• Maintenance records are kept to track equipment performance and identify are...read more

Preventive maintenance is scheduled maintenance to prevent equipment failure. Predictive maintenance uses data to predict when maintenance is needed.

• Preventive maintenance involves regularly scheduled maintenance to prevent equipment failure.

• Predictive maintenance uses data to predict when maintenance is needed, based on factors such as usage, wear and tear, and environmental conditions.

• Examples of preventive maintenance include changing oil in a car every 3,000 miles or repl...read more

1 HP is equal to 746 watts.

• HP stands for horsepower, a unit of power used in the automotive and manufacturing industries.

• Watt is the SI unit of power.

• The conversion factor between HP and watt is 746.

A distillation column is a vertical vessel used for separating a mixture of liquids into its individual components.

• The column consists of trays or packing material that provide a large surface area for vapor-liquid contact.

• The feed enters the column at the bottom and is heated to its boiling point.

• The vapor rises up the column and condenses on the trays or packing material.

• The condensed liquid flows down the column and is collected at various points.

• The top of the column cont...read more

I have extensive electrical maintenance experience in the food industry.

• Experience with electrical systems in food processing and packaging equipment

• Knowledge of safety regulations and standards for food industry

• Familiarity with troubleshooting and repairing electrical issues in food production lines

• Ability to work with programmable logic controllers (PLCs) and other automation systems

• Experience with preventive maintenance and equipment upgrades to improve efficiency and redu...read more

Different types of maintenance, cost calculation methods, and energy-saving ideas are crucial for a maintenance engineer.

• Types of maintenance include preventive, corrective, predictive, and condition-based maintenance.

• Cost calculation methods involve calculating the cost of maintenance per unit of time or per unit of production.

• Energy-saving ideas include using energy-efficient equipment, optimizing equipment usage, and implementing energy management systems.

• Regular maintenan...read more

The main causes of rolling mill bearing breakage are lack of lubrication, contamination, overloading, and misalignment.

• Lack of lubrication can lead to increased friction and heat generation, causing the bearing to fail prematurely.

• Contamination from dirt, debris, or water can accelerate wear and tear on the bearing surfaces.

• Overloading the bearing beyond its capacity can cause excessive stress and lead to failure.

• Misalignment of the shafts can result in uneven distribution of...read more