10+ Mechanical Maintenance Supervisor Interview Questions and Answers

Reciprocating compressor 1st stage pressure increase - reason and troubleshooting

• Possible reasons: clogged suction filter, worn out piston rings, valve failure, incorrect valve timing, inadequate lubrication

• Troubleshooting steps: check suction filter, inspect piston rings and valves, adjust valve timing, ensure proper lubrication

• If issue persists, consult manufacturer's manual or seek professional help

Different types of pumps and their parts with sectional drawings.

• Centrifugal pumps have impellers, volutes, and shafts.

• Positive displacement pumps have gears, lobes, and vanes.

• Diaphragm pumps have diaphragms, check valves, and ball valves.

• Sectional drawings show the internal parts of a pump.

• Pumps can be classified based on their application, such as water pumps, fuel pumps, and chemical pumps.

Answering questions related to bearings, gearbox oil types, and gear types.

• Bearings are used to reduce friction and support rotating parts.

• Types of oil used in gearbox include mineral oil, synthetic oil, and semi-synthetic oil.

• Converse gears are used to transmit power between two parallel shafts.

• Other types of gears include spur gears, helical gears, bevel gears, and worm gears.

DBS in coupling refers to the distance between the two shafts.

• DBS stands for Distance Between Shafts.

• It is the distance between the two shafts in a coupling.

• It is an important parameter to consider while selecting a coupling.

• The DBS value is usually provided by the coupling manufacturer.

• It helps in ensuring proper alignment and avoiding misalignment issues.

The iron-carbon equilibrium diagram shows the phases and microstructures of iron-carbon alloys at different temperatures and carbon concentrations.

• The diagram is also known as the iron-carbon phase diagram.

• It is used to understand the behavior of iron-carbon alloys during heating and cooling processes.

• The diagram shows the different phases such as ferrite, austenite, cementite, and graphite.

• The carbon content affects the phase transformations and the resulting microstructures...read more

Bearings are removed using various materials depending on the type of bearing and the method of removal.

• Common materials used for bearing removal include bearing pullers, hydraulic presses, and heat guns.

• For press-fit bearings, a bearing puller or hydraulic press may be used to remove the bearing from the shaft or housing.

• For interference-fit bearings, heat may be applied to the surrounding metal to expand it and loosen the bearing.

• Care must be taken to avoid damaging the bea...read more

Alignment of pump and driver coupling is crucial for efficient operation and to prevent damage.

• Proper alignment ensures smooth power transmission between the pump and driver.

• Misalignment can lead to excessive vibration, premature wear, and reduced efficiency.

• Alignment can be achieved through various methods such as laser alignment or dial indicators.

• Alignment should be checked regularly and adjusted if necessary.

• Example: Using laser alignment tools to align the pump and drive...read more

Types of gears include spur, helical, bevel, worm, and rack and pinion. Types of bearings include ball, roller, and sleeve bearings.

• Spur gears have straight teeth and are used for low-speed applications.

• Helical gears have angled teeth and are used for high-speed applications.

• Bevel gears have angled teeth and are used for changing the direction of power transmission.

• Worm gears have a screw-like thread and are used for high reduction ratios.

• Rack and pinion gears are used for co...read more

Grade of oil refers to the viscosity or thickness of the oil.

• The grade of oil is determined by its viscosity at a certain temperature.

• Viscosity is the measure of a fluid's resistance to flow.

• The Society of Automotive Engineers (SAE) has established a grading system for motor oils.

• For example, SAE 10W-30 oil has a viscosity of 10 at low temperatures and 30 at high temperatures.

• Choosing the right grade of oil is important for proper lubrication and engine performance.

Valve types include gate, globe, ball, butterfly, and check valves. Pump types include centrifugal, positive displacement, and axial flow pumps.

• Valve types: gate, globe, ball, butterfly, check

• Pump types: centrifugal, positive displacement, axial flow

• Gate valves control flow by raising or lowering a gate

• Globe valves control flow by raising or lowering a plug

• Ball valves control flow with a rotating ball

• Butterfly valves control flow with a rotating disc

• Check valves allow flow in...read more

Material and mechanics properties are essential for mechanical maintenance supervisors to understand.

• Material properties include strength, ductility, hardness, and toughness.

• Mechanics properties include stress, strain, elasticity, and plasticity.

• Understanding these properties helps in selecting appropriate materials and designing effective maintenance plans.

• For example, a supervisor must know the strength of a material to determine if it can withstand a certain load or force....read more

Ball screw is a mechanical device used to convert rotational motion into linear motion.

• It consists of a screw and a nut with ball bearings that roll between them.

• The ball bearings reduce friction and increase efficiency.

• Ball screws are commonly used in industrial machinery, such as CNC machines and robotics.

• They offer high accuracy and repeatability in positioning.

• Maintenance includes regular lubrication and checking for wear and tear.

My favorite subject is mechanical engineering as it provides me with the knowledge to understand and maintain complex machinery.

• Mechanical engineering provides a comprehensive understanding of how machines work

• It teaches about materials, design, and manufacturing processes

• This knowledge is essential for maintaining and repairing machinery

• For example, understanding the principles of thermodynamics helps in maintaining HVAC systems

• Knowledge of mechanics is crucial for maintaini...read more

Design of part manufacturer refers to the process of creating and producing parts for machinery and equipment.

• Designing parts that meet specifications and requirements

• Selecting appropriate materials and manufacturing processes

• Ensuring quality control and testing

• Collaborating with engineers and production teams

• Continuous improvement and optimization of designs

• Examples: CNC machining, injection molding, 3D printing