Wapcos Interview Questions, Process, and Tips

COD stands for Chemical Oxygen Demand, which is a measure of the amount of organic matter in water.

• COD is a water quality parameter used to determine the amount of organic pollutants in water.

• It measures the amount of oxygen required to oxidize the organic matter in water.

• COD is often used as an indicator of water pollution and the effectiveness of wastewater treatment.

• High COD levels can indicate the presence of harmf...read more

The limit of hardness in the outlet of waste water depends on the regulatory standards and the intended use of the water.

• The limit of hardness is usually expressed in terms of milligrams per liter (mg/L) of calcium carbonate.

• Regulatory standards vary by country and region.

• The intended use of the water also affects the limit of hardness. For example, water used for irrigation may have a higher limit than water used for ...read more

The limit of hardness is 300ppm in water.

• Hardness refers to the amount of dissolved minerals in water.

• The limit of 300ppm is set to ensure the water is safe for consumption and does not cause damage to pipes and appliances.

• Common minerals that contribute to hardness include calcium and magnesium.

• Water softeners can be used to reduce hardness levels.

• Testing for hardness can be done using a water testing kit or by sendin

The current carrying capacity of conductors varies depending on their material and size.

• The current carrying capacity of a conductor is determined by its cross-sectional area.

• Conductors with larger cross-sectional areas can carry more current.

• The material of the conductor also affects its current carrying capacity.

• Copper is a commonly used conductor material with high current carrying capacity.

• Aluminum is another condu...read more

SLD of 132/33kV & 33/11kV substations

• SLD stands for Single Line Diagram

• 132/33kV substation SLD shows the transmission line, transformer, circuit breaker, isolator, etc.

• 33/11kV substation SLD shows the distribution line, transformer, circuit breaker, isolator, etc.

Field tests required before commissioning of power transformers include insulation resistance test, turns ratio test, and polarity test.

• Insulation resistance test is conducted to ensure the insulation system is intact and can withstand the operating voltage.

• Turns ratio test is performed to verify the turns ratio of the transformer and ensure it meets the design specifications.

• Polarity test is carried out to confirm the...read more

Finalizing a JMC involves several steps to ensure its accuracy and completeness.

• Review and verify all data and calculations

• Ensure compliance with all relevant regulations and standards

• Obtain necessary approvals and signatures

• Prepare final report or documentation

• Archive all relevant documents for future reference

Necessary steps before commissioning a substation

• Performing insulation resistance tests

• Checking the grounding system

• Verifying the correct functioning of protection relays

• Testing the transformer and circuit breakers

• Ensuring proper labeling and documentation

• Conducting a thorough safety inspection