10+ ABB Interview Questions and Answers for Freshers

Factors to consider for lighting calculation include type of space, desired lighting levels, fixture efficiency, and lighting layout.

• Type of space (office, warehouse, retail, etc.)

• Desired lighting levels (measured in lux or foot-candles)

• Fixture efficiency (lumens per watt)

• Lighting layout (spacing and placement of fixtures)

• Natural lighting sources (windows, skylights)

• Color rendering index (CRI) for accurate color representation

• Lighting controls (dimming, sensors)

• Energy efficie...read more

Environment conditions such as temperature, humidity, and cleanliness are crucial for panel installation.

• Temperature should be within specified range to prevent damage to components.

• Humidity levels should be controlled to avoid condensation and corrosion.

• Cleanliness is important to prevent dust and debris from affecting performance.

• Proper ventilation is necessary to prevent overheating.

• Avoid exposure to direct sunlight or extreme weather conditions.

• Consider environmental fact...read more

Voltage levels as per standards vary depending on the application and region, with common levels including 110V, 220V, and 415V.

• Voltage levels can vary depending on the application and region

• Common residential voltage levels include 110V and 220V

• Industrial voltage levels are typically higher, such as 415V

• International standards like IEC and ANSI provide guidelines for voltage levels

Restricted Earth Fault is a type of fault in electrical systems where the fault current is limited to a specific section of the system.

• Occurs when a fault current flows from a phase conductor to the earth through a restricted path

• Usually detected by a relay that monitors the current imbalance between the phase and neutral conductors

• Helps in quickly identifying and isolating the fault to prevent damage to equipment and ensure safety

• Commonly used in power distribution systems t...read more

Differential earth fault is a type of fault in electrical systems where the current flowing into and out of the system is not equal due to an earth fault.

• Differential earth fault protection is used to detect such faults by comparing the current entering and leaving the system.

• It is important for safety as it helps prevent damage to equipment and potential electric shocks.

• Examples of differential earth fault protection devices include differential relays and ground fault detec...read more

Implement a scheme using temperature sensors to detect transformer temperature.

• Install temperature sensors at key points on the transformer

• Set up a monitoring system to continuously track temperature readings

• Establish temperature thresholds for alerts and shutdowns

• Implement a cooling system to regulate temperature if needed

Molded Case Circuit Breakers (MCCBs) are types of circuit breakers that provide protection against overcurrents.

• Thermal-magnetic MCCB: Trips when a current overload or short circuit is detected.

• Electronic MCCB: Uses electronic components for more precise and adjustable protection.

• Compact MCCB: Smaller in size for limited space installations.

• Adjustable MCCB: Allows for manual adjustment of trip settings.

• Motor protection MCCB: Specifically designed for motor protection applicat...read more

Transformer insulation class indicates the temperature at which the insulation can operate safely.

• Transformer insulation class is denoted by a letter (e.g. A, B, F, H) which corresponds to a maximum allowable temperature rise above ambient.

• Higher insulation classes can withstand higher temperatures, providing better protection for the transformer.

• Common insulation classes include A (105°C), B (130°C), F (155°C), and H (180°C).

The cable length for PA cables varies depending on the specific application, while the diameter is typically determined by the current carrying capacity and voltage requirements.

• Cable length for PA cables can range from a few meters to several hundred meters, depending on the distance between the PA system and the speakers.

• The diameter of PA cables is usually determined by the current carrying capacity and voltage requirements of the system. Thicker cables are needed for high...read more

There are two main types of smoke detectors: ionization and photoelectric.

• Ionization smoke detectors use a small amount of radioactive material to ionize the air and detect smoke particles.

• Photoelectric smoke detectors use a light beam to detect smoke particles in the air.

• Dual sensor smoke detectors combine both ionization and photoelectric technologies for more comprehensive detection.

Quality points at the pouring time of concrete include proper mix proportions, correct placement, adequate compaction, and appropriate curing.

• Proper mix proportions ensure the desired strength and durability of the concrete.

• Correct placement involves placing the concrete in the designated location without segregation or excessive bleeding.

• Adequate compaction ensures that there are no voids or air pockets in the concrete, resulting in a dense and strong structure.

• Appropriate c...read more

The process of tower foundation involves several steps that are carried out day by day.

• Day 1: Site preparation and layout survey

• Day 2: Excavation for foundation

• Day 3: Reinforcement placement

• Day 4: Formwork installation

• Day 5: Concrete pouring

• Day 6: Curing of concrete

• Day 7: Removal of formwork

• Day 8: Quality inspection and testing

• Day 9: Backfilling around the foundation

• Day 10: Final inspection and documentation

Cube mould size refers to the dimensions of the mould used to cast concrete cubes for testing.

• Cube moulds are typically made of steel or cast iron.

• The most common cube mould size used in construction is 150mm x 150mm x 150mm.

• Other sizes like 100mm x 100mm x 100mm or 200mm x 200mm x 200mm may also be used depending on the requirements.

• Cube moulds have removable base plates to facilitate easy removal of the hardened concrete cubes.

• These cubes are then tested for compressive str...read more

Sloped cutting refers to the excavation of soil or rock at an inclined angle to create a slope or incline.

• Sloped cutting is commonly used in construction projects to create roadways, railways, or canals on hilly terrains.

• It involves removing the excess material from a higher elevation to a lower elevation, forming a sloping surface.

• The angle of the slope is determined based on factors such as soil stability, desired gradient, and project requirements.

• Sloped cutting may requir...read more

There are several popular pipe fitting companies in India.

• L&T

• Tata Pipes

• Jindal Pipes

• Ashirvad Pipes

• Finolex Pipes

Production requirement and work flow are essential for efficient product development.

• Production requirement involves identifying the necessary resources, materials, and equipment needed for the production process.

• Work flow refers to the sequence of tasks and activities involved in the production process.

• Efficient work flow ensures that each task is completed in a timely manner and that there are no bottlenecks in the process.

• Both production requirement and work flow are criti...read more