10+ Mechanical Maintenance Officer Interview Questions and Answers

Various equipments handled, permissible leakage, oil used for vacuum pumps and reactor gear box, cooling tower water temperature, brine temperature

• Equipments handled include reactors, vacuum pumps, gear boxes

• Permissible leakage for reactor is typically around 1-2 liters for 15 minutes

• Toshniwal vacuum pumps use oil such as mineral oil or synthetic oil

• Reactor gear box may use gear oil or lubricating oil

• Cooling tower water temperature is usually maintained around 25-30 degrees C...read more

Alignment of pump coupling is done by using alignment tools and techniques to ensure proper alignment of the pump shaft and motor shaft.

• Use alignment tools such as dial indicators, laser alignment tools, or straight edges.

• Check and adjust the parallel and angular alignment between the pump shaft and motor shaft.

• Ensure that the coupling hubs are properly aligned and tightened to the shafts.

• Perform alignment checks after installation and periodically during maintenance.

• Proper a...read more

Boiler is used to generate steam while thermopack uses thermal energy to heat a fluid.

• Boiler produces high-pressure steam while thermopack heats a fluid at low pressure.

• Boiler is used in power plants and industrial processes while thermopack is used in small-scale industries.

• Boiler requires more maintenance and has a higher risk of explosion compared to thermopack.

• Boiler uses water as a working fluid while thermopack uses oil or other fluids.

• Boiler has a higher efficiency in ...read more

The maximum possible vacuum is determined by the pressure limit of the vacuum pump and the vapor pressure of the fluid being evacuated.

• The maximum vacuum achievable is limited by the pressure limit of the vacuum pump.

• The vapor pressure of the fluid being evacuated also limits the maximum vacuum.

• Vacuum levels are typically measured in torr or millibar units.

• The highest vacuum ever achieved in a laboratory is around 10^-13 torr.

• Vacuum technology is used in a variety of industri...read more

5S is a workplace organization method that improves efficiency and safety through five key principles.

• Sort: Remove unnecessary items from the workspace. Example: Discard old tools that are no longer used.

• Set in order: Organize tools and materials for easy access. Example: Label shelves and use shadow boards for tools.

• Shine: Clean the workspace regularly to maintain standards. Example: Schedule daily cleaning routines.

• Standardize: Create standardized work procedures and checkl...read more

Material manufacturing is the process of creating products from raw materials through various techniques and processes.

• Material manufacturing involves transforming raw materials into finished products

• It includes processes such as casting, molding, machining, and welding

• Materials can be metals, plastics, ceramics, or composites

• Quality control is crucial in material manufacturing to ensure product reliability

• Examples include manufacturing of car parts, electronic components, an...read more

pH range measures the acidity or alkalinity of a solution, typically from 0 (acidic) to 14 (alkaline).

• pH 0-6: Acidic solutions (e.g., hydrochloric acid).

• pH 7: Neutral solutions (e.g., pure water).

• pH 8-14: Alkaline solutions (e.g., sodium hydroxide).

• pH affects chemical reactions, biological processes, and material properties.

I have encountered various types of reactors, including nuclear, chemical, and biological reactors, each with unique operational principles.

• Nuclear reactors: Used for power generation and research, e.g., pressurized water reactors (PWR).

• Chemical reactors: Employed in the production of chemicals, e.g., batch reactors for pharmaceuticals.

• Biological reactors: Utilized in wastewater treatment, e.g., activated sludge systems.

Psi and kg/cm² are both units of pressure; 1 psi equals 0.070307 kg/cm².

• 1 psi is approximately equal to 0.070307 kg/cm².

• To convert psi to kg/cm², multiply by 0.070307.

• For example, 30 psi is about 2.109 kg/cm² (30 * 0.070307).

• Conversely, to convert kg/cm² to psi, multiply by 14.223.

• For instance, 1 kg/cm² equals approximately 14.223 psi.

Welding is a fabrication process that joins materials, typically metals, through heat and pressure.

• Arc Welding: Uses an electric arc to melt and join metals. Example: Shielded Metal Arc Welding (SMAW).

• MIG Welding: Metal Inert Gas welding, uses a continuous wire feed. Example: Gas Metal Arc Welding (GMAW).

• TIG Welding: Tungsten Inert Gas welding, uses a non-consumable tungsten electrode. Example: Gas Tungsten Arc Welding (GTAW).

• Oxy-Fuel Welding: Combines oxygen and fuel gas to ...read more