900+ Mechanical Engineer Interview Questions and Answers

Material handling process using belt conveyor system involves transporting materials efficiently. The width and type of belt conveyor depend on the specific application.

• Belt conveyor system is used to transport materials from one location to another in a production facility or warehouse.

• The width of the belt conveyor depends on the size and weight of the materials being transported. It can range from a few inches to several feet.

• The type of belt conveyor can vary based on the...read more

Evaluating performance can involve metrics like project completion, innovation, teamwork, and adherence to safety standards.

• Project Completion: Timely delivery of projects within budget, e.g., completing a design project ahead of schedule.

• Innovation: Contribution of new ideas or improvements, such as developing a more efficient cooling system.

• Teamwork: Collaboration with colleagues, demonstrated by successful cross-departmental projects.

• Safety Standards: Adherence to safety p...read more

Actual stress is the force applied to a material, while engineering stress is the force per unit area of the original cross-sectional area.

• Actual stress is calculated using the actual area of the material that is being stressed, while engineering stress is calculated using the original cross-sectional area of the material.

• Engineering stress is commonly used in engineering design and analysis, while actual stress is used in material testing and failure analysis.

• For example, if...read more

Engine oil pressure is the pressure at which the oil is pumped through the engine to lubricate its moving parts.

• Engine oil pressure is measured in pounds per square inch (PSI).

• Low oil pressure can cause engine damage and should be addressed immediately.

• Oil pressure can vary depending on engine speed and temperature.

• Oil pressure gauges are typically located on the dashboard of a vehicle.

• Normal oil pressure for most engines is between 20 and 60 PSI.

Improving human capacity management in HR for oil and gas companies like NNPC/SEPLAT

• Implementing regular training programs to enhance skills and knowledge

• Utilizing technology for efficient recruitment and performance evaluation

• Creating a conducive work environment to boost employee morale

• Offering competitive compensation and benefits to attract and retain top talent

• Establishing clear career development paths for employees

Checkpoints during installation of reactor mechanical seal

• Alignment of seal faces

• Proper installation of seal support system

• Correct torque applied to bolts

• Verification of seal flush system

• Inspection of seal faces for damage or defects

• Testing of seal for leakage

• Documentation of installation process

The obsolete angle of impulse turbine is the angle at which the blades are set in relation to the direction of the water flow.

• Obsolete angle is typically around 20-22 degrees for impulse turbines.

• It determines the efficiency and performance of the turbine.

• Incorrect angle can lead to reduced power output and efficiency.

• Examples: Pelton wheel, Turgo turbine.

Manufacturing processes include casting, forging, machining, welding, and more.

• Casting: pouring molten metal into a mold to create a solid object

• Forging: shaping metal by heating and hammering

• Machining: using tools to remove material from a workpiece

• Welding: joining two pieces of metal by melting them together

• Additive manufacturing: building up layers of material to create a 3D object

• Forming: shaping metal without removing material, such as bending or stamping

• Extrusion: forci...read more

Hydraulics is a branch of engineering that deals with the mechanical properties of liquids, especially water or oil, and their applications.

• Hydraulics involves the study of fluid mechanics and the behavior of liquids under pressure.

• It is used in various applications such as hydraulic machinery, hydraulic systems, and hydraulic power transmission.

• Hydraulic systems use fluid pressure to generate, control, and transmit power.

• Examples of hydraulic systems include hydraulic lifts,...read more

Thermodynamics is the study of energy and its transformations in relation to heat and work.

• It deals with the behavior of energy and its conversion from one form to another.

• It involves the study of heat transfer, work, and the properties of substances.

• Thermodynamics is essential in designing and analyzing various mechanical systems.

• Examples include the study of engines, refrigeration systems, and power plants.

Belt joint process involves connecting two ends of a belt. Belt width and type depend on the application.

• Belt joint process includes mechanical fasteners, vulcanization, and welding.

• Belt width depends on the conveyor system's design and the material being transported.

• Types of belts include flat belts, V-belts, timing belts, and ribbed belts.

• Belt type depends on the application, load capacity, speed, and environment.

• Common materials for belts include rubber, PVC, nylon, and po...read more

Total Productive Maintenance (TPM) is a maintenance strategy that aims to maximize equipment effectiveness and minimize downtime.

• TPM involves the entire workforce in the maintenance process

• It focuses on proactive maintenance to prevent breakdowns

• TPM has eight pillars including autonomous maintenance, planned maintenance, and quality maintenance

• TPM aims to improve overall equipment effectiveness (OEE) by reducing downtime, improving quality, and increasing productivity

Maintenance philosophies include preventive, predictive, corrective, and reliability-centered maintenance.

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

• Predictive maintenance uses data analysis and monitoring to predict when maintenance is needed.

• Corrective maintenance is performed after a failure has occurred to restore equipment to working condition.

• Reliability-centered maintenance focuses on identifying critica...read more

The clearance of TDC and BDC for a vertical reciprocating compressor can be measured using a dial indicator.

• Use a dial indicator to measure the distance between the top dead center (TDC) and bottom dead center (BDC) positions of the piston.

• Rotate the crankshaft to bring the piston to TDC and set the dial indicator to zero.

• Rotate the crankshaft to bring the piston to BDC and note the reading on the dial indicator.

• The difference between the readings at TDC and BDC will give you...read more

The density of water is approximately 1 gram per cubic centimeter.

• The density of water is a fundamental property of the substance.

• It is commonly used as a reference point for comparing the densities of other substances.

• The density of water varies slightly with temperature and pressure.

• At 4 degrees Celsius, the density of water is exactly 1 gram per cubic centimeter.

• Water is less dense in its solid form (ice) than in its liquid form.

Blade efficiency of impulse turbine is typically around 80-90%.

• Blade efficiency is a measure of how effectively the blades of a turbine convert the kinetic energy of the fluid into mechanical energy.

• It is calculated as the ratio of the actual work done by the blades to the work that would be done if the fluid were to expand isentropically.

• Blade efficiency for impulse turbines is generally higher than reaction turbines, typically ranging from 80-90%.

• Factors affecting blade eff...read more

The efficiency of an impulse turbine is typically around 70-90%.

• Efficiency is calculated as the ratio of actual work output to the theoretical work input.

• Impulse turbines have high efficiency due to the fact that the energy transfer occurs in stages.

• Efficiency can be affected by factors such as blade design, operating conditions, and maintenance.

• Examples of impulse turbines include Pelton wheel and Turgo turbine.

Resources and manpower can be handled efficiently by proper planning and allocation.

• Identify the required resources and manpower for the project

• Allocate resources and manpower based on their skills and availability

• Regularly monitor the progress and adjust the allocation if necessary

• Maintain open communication with the team to ensure smooth workflow

• Implement contingency plans in case of unexpected events

Change in class in duct pressurization affects ducting installation and fabrication.

• A change in class may require different materials for ducting installation and fabrication.

• Higher class ducts may require thicker materials to withstand higher pressures.

• Lower class ducts may require less expensive materials to meet pressure requirements.

• Changes in class may also affect the size and layout of ducting.

• Proper calculations and design are necessary to ensure safe and efficient duc...read more

Factor of safety is a measure of how much stronger a structure is than it needs to be for its intended purpose.

• Factor of safety is the ratio of the maximum load a structure can handle to the actual load it is expected to handle.

• It is used to ensure that a structure or component can withstand unexpected loads or stresses.

• For example, a bridge may have a factor of safety of 2, meaning it can handle twice the maximum expected load without failing.

• Factors of safety vary depending...read more

The time required for the erection of a 1000mtrs belt conveyor structure trassel assembly work and gallery assembly work depends on the manpower available.

• The time of erection will vary based on the experience and efficiency of the workers involved.

• Factors such as complexity of the structure, availability of equipment, and coordination among the team members will also impact the assembly time.

• For example, if there are skilled workers with prior experience in similar projects,...read more

Kaizen is continuous improvement, 5S is a workplace organization method, QA is quality assurance and QC is quality control.

• Kaizen is a Japanese term for continuous improvement in all aspects of life, including work.

• 5S is a workplace organization method that stands for Sort, Set in Order, Shine, Standardize, and Sustain.

• QA is the process of ensuring that a product or service meets the required quality standards.

• QC is the process of checking that a product or service meets the ...read more

Cooling tower performance is measured by its ability to remove heat from a process stream.

• Cooling tower performance is affected by factors such as air flow rate, water flow rate, and temperature difference between the process stream and cooling water.

• The efficiency of a cooling tower can be improved by increasing the surface area of the heat transfer media, using a more efficient fan, or optimizing the water distribution system.

• Performance can be measured by the approach temp...read more

Roller screen maintenance involves regular cleaning, lubrication, and inspection.

• Clean the rollers and screen regularly to prevent buildup of debris and dirt.

• Lubricate the rollers and bearings to ensure smooth operation.

• Inspect the rollers, bearings, and screen for wear and damage.

• Replace any worn or damaged parts immediately to prevent further damage.

• Follow manufacturer's guidelines for maintenance and schedule regular maintenance checks.

• Train personnel on proper maintenance...read more

Heat load calculations involve determining the amount of heat that needs to be added or removed from a space to maintain a desired temperature.

• Components include heat gain from occupants, equipment, lighting, and infiltration, as well as heat loss through walls, windows, and roofs.

• Calculations are typically done using formulas based on the specific heat capacities and thermal properties of materials.

• Example: In HVAC design, heat load calculations are used to size equipment li...read more

A train doesn't need a differential because its wheels are fixed to the same axle and rotate at the same speed.

• Train wheels are fixed to the same axle

• Wheels rotate at the same speed

• Differential is used in vehicles with wheels that rotate at different speeds

• Differential allows for smooth turning

The refrigerant used in car air conditioning systems is called R-134a.

• R-134a is a type of hydrofluorocarbon (HFC) refrigerant commonly used in car air conditioning systems.

• It replaced the previously used R-12 refrigerant due to its ozone-depleting properties.

• R-134a is non-ozone depleting and considered more environmentally friendly.

• It has a lower global warming potential compared to other refrigerants.

• R-134a is also used in other cooling systems such as refrigerators and free...read more