20+ Wipro Interview Questions and Answers

I have purchased a wide range of commodities including raw materials, equipment, and services.

• Raw materials such as steel, aluminum, and plastics

• Equipment like machinery, vehicles, and computers

• Services such as transportation, maintenance, and consulting

• Office supplies and consumables

• Packaging materials

• Electronics and electrical components

The number of circuit breakers used in an electrical system varies depending on the size and complexity of the system.

• The number of circuit breakers used in an electrical system depends on factors such as the size of the system, the number of circuits, and the specific requirements of the building or facility.

• Residential electrical systems typically have a main circuit breaker at the electrical panel, along with individual circuit breakers for each circuit in the house.

• Commer...read more

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The single line diagram for HY to LT Panel diagram is a visual representation of the electrical connections and components in the system.

• The single line diagram shows the flow of electrical power from the HY (High Voltage) side to the LT (Low Tension) side.

• It includes the main components such as transformers, circuit breakers, switches, and control devices.

• The diagram also indicates the interconnections between different panels and equipment.

• Symbols and labels are used to rep...read more

Current transformer secondary is open to prevent damage to the transformer and connected equipment.

• An open secondary circuit prevents excessive current flow and protects the transformer from damage.

• It allows for safe measurement and monitoring of current without risk of short circuits.

• An open secondary also prevents damage to connected equipment by isolating it from high currents.

• In case of a fault or overload, an open secondary circuit ensures the safety of personnel working...read more

In a power failure situation, effective management involves ensuring safety, communication, and contingency planning.

• Ensure the safety of employees and customers by providing emergency lighting and clear evacuation procedures.

• Maintain open lines of communication with staff, customers, and relevant authorities to provide updates and coordinate actions.

• Implement contingency plans such as backup power sources, alternative work locations, or temporary shutdowns.

• Train employees on...read more

A good quality of the purchase is reliability.

• Reliability ensures that the purchased products or services consistently meet the required standards.

• It reduces the risk of product failure or service disruption.

• Reliable purchases contribute to customer satisfaction and trust in the organization.

• For example, purchasing high-quality equipment from a trusted supplier ensures its reliability in the long run.

Vendor rating can be given based on various factors such as quality, delivery, price, and customer service.

• Evaluate the vendor's quality of products or services

• Assess the vendor's ability to meet delivery deadlines

• Consider the vendor's pricing competitiveness

• Take into account the vendor's customer service and responsiveness

• Assign ratings or scores to each factor and calculate an overall vendor rating

CT and PT are both electrical devices used in power systems, but they have different functions and applications.

• CT stands for Current Transformer, while PT stands for Potential Transformer.

• CTs are used to measure and transform high currents into manageable levels for instruments and protective relays.

• PTs are used to measure and transform high voltages into low voltages for instruments and protective relays.

• CTs are typically used in conjunction with ammeters and relays to moni...read more

B check in a generator refers to a comprehensive inspection and maintenance procedure to ensure its proper functioning.

• B check involves a thorough examination of the generator's components, including the engine, fuel system, cooling system, electrical system, and control panel.

• It includes tasks such as checking for leaks, inspecting belts and hoses, testing the battery, cleaning or replacing filters, and verifying proper voltage and frequency output.

• B checks are typically per...read more

Coordination with clients requires effective communication, understanding of their needs, and timely delivery of work.

• Establish clear communication channels

• Understand client's requirements and expectations

• Provide regular updates on project progress

• Address any concerns or issues promptly

• Deliver work on time and within budget

• Maintain a professional and respectful attitude

• Build a positive and long-lasting relationship

CVT stands for Continuously Variable Transmission. CB testing procedures involve measuring the performance of circuit breakers.

• CVT is a type of transmission that allows for seamless gear shifting

• To shutdown a line, the power source must be disconnected and all equipment turned off

• CB testing procedures involve measuring the insulation resistance, contact resistance, and timing of circuit breakers

• CB testing values vary depending on the specific breaker being tested

• Tan delta tes...read more

Differential protection is a type of transformer protection that compares the currents entering and leaving the transformer.

• Differential protection is based on Kirchhoff's current law.

• If the difference between the currents is greater than a set threshold, the protection system will trip.

• This type of protection is used to detect internal faults in the transformer.

• Differential protection can be applied to both power and distribution transformers.

PPE required for TL and substation include hard hats, safety glasses, gloves, and high visibility clothing.

• Hard hats to protect from falling objects

• Safety glasses to protect eyes from debris

• Gloves to protect hands from electrical shock and burns

• High visibility clothing to increase visibility and safety

• Additional PPE may be required depending on specific tasks and hazards

The rating of a transformer refers to its power capacity and voltage levels.

• Transformer rating is typically given in kVA (kilovolt-amperes) or MVA (megavolt-amperes).

• It indicates the maximum power that the transformer can handle without overheating.

• The rating also includes the primary and secondary voltage levels of the transformer.

• For example, a transformer may be rated as 500 kVA, 11 kV/415 V.

• Properly sizing the transformer rating is crucial for efficient operation and safe...read more

One Bay Shutdown process involves isolating a single bay for maintenance while keeping the rest of the system operational.

• Isolate the bay by closing necessary valves and disconnecting equipment

• Ensure proper tagging and lockout procedures are followed

• Implement safety measures to prevent accidents

• Coordinate with other departments to minimize impact on operations

• Perform necessary maintenance work efficiently and safely

• Test the bay before bringing it back online

A substation is a facility that transforms high voltage electricity to lower voltage for distribution to consumers.

• Substations play a crucial role in the power grid by facilitating the transmission and distribution of electricity.

• They receive electricity from power plants or transmission lines and transform it to a lower voltage suitable for distribution.

• Substations contain various equipment such as transformers, circuit breakers, switches, and protective devices.

• They may be ...read more

Buchholz relay is a protective device used in oil-filled transformers to detect and prevent faults.

• It is installed in the oil-filled transformer tank.

• It detects the presence of gas or oil flow in the transformer oil.

• It trips the transformer if any fault is detected.

• It is a type of gas actuated relay.

• It is named after its inventor Max Buchholz.

Parts of a transformer include core, windings, insulation, tap changer, bushings, and cooling system.

• Core: Provides a path for magnetic flux

• Windings: Primary and secondary coils for transferring energy

• Insulation: Prevents short circuits

• Tap changer: Adjusts the turns ratio

• Bushings: Insulated devices for connecting external circuits

• Cooling system: Keeps the transformer from overheating

A scheme of a substation refers to the layout and configuration of the various components within the substation.

• The scheme includes the arrangement of transformers, circuit breakers, busbars, and other equipment.

• It also shows the connections between different components and how power flows through the substation.

• The scheme is essential for understanding the overall operation and maintenance of the substation.

• Examples of substation schemes include single line diagrams, three-l...read more

Shutting down a process involves terminating a program or application running on a computer system.

• Use task manager or command line to end the process

• Ensure all unsaved work is saved before shutting down

• Consider any dependencies or impact on other processes

Recent tax amendments include changes in tax rates, deductions, and compliance requirements.

• Introduction of new tax slabs under the new optional tax regime

• Increase in TDS rates for non-salaried payments

• Extension of deadlines for various tax compliances

• Changes in tax audit limits for businesses