20+ Interview Questions and Answers

Number of trays and reflux ratio can be calculated using various methods such as McCabe-Thiele method or Fenske equation.

• Use McCabe-Thiele method for distillation columns to determine number of trays required.

• Calculate reflux ratio by dividing the liquid returning to the column by the liquid leaving the top tray.

• Consider factors such as desired separation efficiency and operating conditions when determining number of trays and reflux ratio.

As an Instrument Technician, I have experience in calibrating and maintaining various instruments such as furnaces, operated by DCS or PLC.

• I have experience in calibrating and maintaining instruments such as pressure gauges, temperature sensors, flow meters, and level transmitters.

• I am familiar with DCS and PLC systems and can troubleshoot any issues that may arise.

• I have worked with furnaces and have experience in maintaining and repairing them.

• I am knowledgeable in safety p...read more

The diameter of a distillation column is designed based on factors such as feed flow rate, composition, pressure, and efficiency.

• Calculate the required vapor and liquid flow rates based on the feed composition and desired separation efficiency.

• Consider the pressure drop along the column and the desired residence time for the vapor and liquid phases.

• Use design equations and correlations to determine the optimal diameter that balances cost and performance.

• Perform simulations or...read more

Common problems during pump disassembly

• Seized bolts or nuts making it difficult to disassemble

• Corrosion or rust causing parts to stick together

• Worn out gaskets or seals leading to leaks

• Misalignment of components making reassembly challenging

I have used BMS in previous sites to monitor and control various building systems.

• Used BMS to monitor and control HVAC systems for optimal energy efficiency

• Implemented BMS to monitor and regulate lighting systems for improved energy savings

• Utilized BMS to monitor and control security systems, including access control and surveillance

• Integrated BMS with fire alarm systems for quick response and evacuation procedures

• Used BMS to monitor and control power distribution systems for...read more

The load capacity of a scaffold can be determined by its design and specifications.

• Check the manufacturer's specifications for the scaffold

• Consider the weight of the materials and equipment that will be placed on the scaffold

• Ensure that the scaffold is designed and constructed to meet the load requirements

• Consult with a qualified engineer or scaffold designer if necessary

Possible issues could include fuel system problems, electrical issues, or mechanical failures.

• Fuel system issues such as clogged fuel filters or air in the fuel lines

• Electrical problems like a faulty starter motor or bad battery

• Mechanical failures such as a seized engine or worn out components

Scaffolding parts include standards, ledgers, transoms, and cross braces. Cross bracing provides lateral stability to the scaffold.

• Scaffolding parts: standards, ledgers, transoms, and cross braces

• Cross bracing prevents lateral movement of the scaffold

• Cross braces should be installed diagonally in both directions for maximum stability

A mechanical seal is typically removed by disassembling the equipment and carefully extracting the seal components.

• Disassemble the equipment to access the mechanical seal

• Carefully remove the seal components without causing damage

• Inspect the seal faces for wear or damage

• Replace the mechanical seal if necessary

• Reassemble the equipment properly

Gearbox overhauling involves disassembly, inspection, replacement of worn parts, reassembly, and testing.

• Start by thoroughly cleaning the gearbox and surrounding area

• Carefully disassemble the gearbox, taking note of the position of each component

• Inspect all parts for wear, damage, or signs of failure

• Replace any worn or damaged parts with new ones

• Reassemble the gearbox following the manufacturer's specifications

• Perform testing to ensure proper functioning before putting the ge...read more

To calculate pressure drop in a pipe, use the Darcy-Weisbach equation or the Hazen-Williams equation.

• Use the Darcy-Weisbach equation: ΔP = f * (L/D) * (ρ * V^2) / 2

• Use the Hazen-Williams equation: ΔP = 10.67 * Q^1.85 / (C^1.85 * D^4.87)

• Where ΔP is the pressure drop, f is the Darcy friction factor, L is the pipe length, D is the pipe diameter, ρ is the fluid density, V is the fluid velocity, Q is the flow rate, and C is the Hazen-Williams coefficient.

• Consider factors such as p...read more

Bearing problems can occur due to various reasons such as lack of lubrication, misalignment, contamination, or wear and tear.

• Lack of lubrication can lead to increased friction and heat generation, causing premature bearing failure.

• Misalignment of shafts can put additional stress on the bearings, leading to wear and eventual failure.

• Contamination from dirt, dust, or moisture can accelerate wear and corrosion of the bearings.

• Normal wear and tear over time can also contribute to...read more

Inspection spare parts are crucial for ensuring equipment reliability and minimizing downtime.

• Inspection spare parts should be readily available in case replacements are needed during routine maintenance checks.

• Regularly inspecting spare parts for wear and tear can help prevent unexpected failures.

• Properly labeling and organizing spare parts can streamline the inspection process and ensure efficiency.

• Maintaining an inventory of spare parts and tracking usage can help in plann...read more

Impeller clearance is the distance between the impeller and the pump casing.

• Impeller clearance is crucial for the efficient operation of rotating equipment.

• It is typically measured using feeler gauges or dial indicators.

• Proper impeller clearance ensures optimal performance and prevents damage to the equipment.

• Clearance adjustments may be necessary during maintenance or troubleshooting.

• Incorrect impeller clearance can lead to reduced efficiency, increased vibration, and potent...read more

Fixing a mechanical seal involves identifying the issue, disassembling the equipment, replacing the seal components, and reassembling the equipment.

• Identify the issue with the mechanical seal, such as leakage or wear

• Disassemble the equipment to access the seal components

• Replace the damaged or worn seal components with new ones

• Ensure proper alignment and installation of the new seal components

• Reassemble the equipment and test for proper functioning

Check weight capacity of lifting equipment, secure machinery properly, inspect for any damage or leaks

• Check weight capacity of lifting equipment before attempting to lift machinery

• Secure machinery properly with appropriate straps or chains

• Inspect machinery for any damage or leaks before lifting to prevent accidents

• Ensure proper training and certification for operators handling the lifting equipment

Calibration of instruments inside furnace is crucial for accurate readings and safe operation.

• Calibration should be done regularly to ensure accuracy

• Instruments should be calibrated according to manufacturer's instructions

• Calibration should be done in a controlled environment to minimize errors

• Examples of instruments inside furnace that need calibration include temperature sensors, pressure gauges, and flow meters

The number of points that need inspection varies depending on the specific context and requirements.

• The number of points needing inspection can be determined by the scope of the analysis or evaluation.

• Factors such as the size of the dataset, complexity of the data, and specific objectives of the analysis can influence the number of points to inspect.

• For example, in a quality control process, a certain percentage of products may need to be inspected to ensure compliance with s...read more

Yes, Total Maintenance Loss (TML) is important for maintenance as it helps in identifying critical equipment and prioritizing maintenance activities.

• TML is a key performance indicator used to measure the overall maintenance effectiveness of a system or equipment.

• It helps in identifying equipment that is causing the most downtime or losses in production.

• By analyzing TML, maintenance teams can prioritize their efforts on critical equipment to minimize downtime and improve overa...read more

Le Chatelier's principle states that a system at equilibrium will respond to a stress by shifting to counteract the stress and restore equilibrium.

• If a stress is applied to a system at equilibrium, the system will adjust to minimize the effect of the stress.

• Changes in concentration, pressure, or temperature can cause a shift in equilibrium.

• For example, if more reactants are added to a system at equilibrium, the system will shift towards the products to counteract the increase...read more