HCLTech Interview Questions and Answers

There are mainly two types of pumps used in a fire pump room: electric pumps and diesel pumps.

• Electric pumps are powered by electricity and are commonly used in buildings with access to a reliable power source.

• Diesel pumps are powered by diesel fuel and are used as a backup in case of power outages or emergencies.

• Some fire pump rooms may also have jockey pumps, which are small pumps used to maintain pressure in the system.

• Each type of pump serves a specific purpose in ensurin...read more

There are several types of filters used in STP plants, including sand filters, activated carbon filters, and membrane filters.

• Sand filters are used to remove suspended solids from wastewater.

• Activated carbon filters are used to remove organic compounds and odors from water.

• Membrane filters, such as ultrafiltration and reverse osmosis, are used for fine filtration and removal of contaminants.

• Other types of filters may include multimedia filters, cartridge filters, and bag filt...read more

STP typically uses technology such as biological treatment processes, filtration systems, and monitoring equipment.

• Biological treatment processes such as activated sludge, trickling filters, and sequencing batch reactors are commonly used in STPs.

• Filtration systems like sand filters, membrane bioreactors, and rotating biological contactors help remove solids and impurities from wastewater.

• Monitoring equipment such as SCADA systems, flow meters, and pH sensors are used to trac...read more

Various types of materials are used in FHC, including pipes, fittings, valves, pumps, and insulation.

• Pipes

• Fittings

• Valves

• Pumps

• Insulation

Moving Bed Biofilm Reactor

• MBBR stands for Moving Bed Biofilm Reactor

• It is a biological wastewater treatment process

• Uses plastic carriers with attached biofilm to treat wastewater

• Provides a large surface area for bacteria to grow and break down organic matter