Sterling & Wilson Interview Questions, Process, and Tips

Risk assessment is the process of identifying, evaluating, and prioritizing potential risks to determine appropriate control measures.

• Risk assessment involves identifying hazards and potential consequences.

• It evaluates the likelihood and severity of each risk.

• Prioritization helps in determining which risks require immediate attention.

• Control measures are implemented to mitigate or eliminate identified risks.

• Examples in...read more

Hazards refer to potential sources of harm or danger that can cause injury, illness, or damage to property.

• Hazards can be physical, chemical, biological, or psychological in nature.

• Examples of hazards include slippery floors, toxic chemicals, infectious diseases, and workplace stress.

• Identifying and assessing hazards is an important part of ensuring safety in any environment.

• Effective hazard control measures can help t...read more

A work permit is a document that authorizes a person to perform a specific job or task in a designated area.

• Work permits are used to ensure that work is carried out safely and efficiently.

• They are typically issued by a supervisor or manager and must be obtained before starting work.

• Work permits may include information such as the type of work to be performed, the hazards involved, and the safety precautions that must b...read more

MSDS stands for Material Safety Data Sheet.

• MSDS is a document that provides information about the hazards of a particular substance or product.

• It includes information on the chemical composition, physical properties, and safe handling procedures.

• MSDS is required by law for all hazardous substances and products.

• It is important for workers to have access to MSDS to ensure their safety in the workplace.

LTI stands for Lost Time Injury, which refers to a work-related injury or illness that results in time off from work.

• LTI is a common safety metric used in workplaces to track and analyze workplace injuries and illnesses.

• It is calculated by dividing the number of lost workdays by the total number of hours worked.

• LTI is an important indicator of workplace safety and can help identify areas for improvement.

• For example, if...read more

Hot work refers to any activity that involves open flames or generates heat and sparks.

• Examples include welding, cutting, brazing, soldering, grinding, and using a torch.

• Hot work requires a permit and must be conducted in a designated area with proper ventilation and fire safety measures.

• Workers must wear appropriate personal protective equipment (PPE) and be trained in hot work safety procedures.

• Hot work can pose a se...read more

Cold work refers to any work that is done on a metal at room temperature or below.

• Cold work can include processes like bending, punching, or rolling.

• It can increase the strength and hardness of the metal, but can also make it more brittle.

• Cold work is often used in the manufacturing of metal products like pipes, wires, and sheet metal.

• It is important to take safety precautions when performing cold work, as it can creat

Height work refers to any work that is performed at a height above ground level.

• Examples of height work include working on rooftops, climbing ladders, and working on scaffolding.

• Height work requires proper safety equipment such as harnesses, helmets, and safety ropes.

• Workers performing height work should be trained in proper safety procedures and should be aware of the risks involved.

• Height work can be dangerous and ca...read more

Excavation refers to the process of digging or removing earth or other materials from the ground.

• Excavation is commonly used in construction and mining industries.

• It involves the use of heavy machinery such as excavators, bulldozers, and backhoes.

• Excavation can be done for various purposes such as building foundations, laying pipelines, or creating underground tunnels.

• Safety measures such as shoring, sloping, and bench...read more

Transformer losses refer to the energy dissipated in a transformer during its operation.

• Transformer losses include copper losses and iron losses.

• Copper losses occur due to the resistance of the transformer windings.

• Iron losses, also known as core losses, occur due to hysteresis and eddy currents in the transformer core.

• Copper losses can be minimized by using larger conductor sizes and reducing the resistance of winding...read more

Neutral is grounded in star connected transformer for safety and to limit voltage rise.

• Grounding neutral limits voltage rise in case of unbalanced loads.

• It provides a path for fault current to flow, which helps in detecting and isolating faults.

• It reduces the risk of electric shock to personnel and damage to equipment.

• In some countries, it is a legal requirement to ground the neutral in electrical systems.

• Example: In a...read more

Power is the rate at which energy is transferred, while energy is the ability to do work.

• Power is measured in watts, while energy is measured in joules.

• Power is the rate at which energy is used or transferred, while energy is the capacity to do work.

• A light bulb may have a power rating of 60 watts, but the energy it consumes over time is measured in watt-hours.

• Energy can exist in different forms, such as kinetic, poten...read more

IGBT stands for Insulated Gate Bipolar Transistor, a power semiconductor device used for switching and amplification of electrical power.

• IGBT is a three-terminal device with a collector, emitter, and gate.

• It combines the advantages of MOSFET and BJT transistors.

• It is commonly used in high power applications such as motor drives, power supplies, and renewable energy systems.

• IGBTs have low on-state voltage drop and high ...read more

Relay is an electrically operated switch that uses an electromagnet to mechanically open or close a circuit.

• Relays are used to control high voltage or high current circuits with low voltage signals.

• They are commonly used in industrial automation, automotive applications, and household appliances.

• Relays can be classified into different types based on their construction and operation, such as electromagnetic relays, soli...read more

CT and PT are connected in circuit to measure current and voltage respectively.

• CT is connected in series with the load to measure current

• PT is connected in parallel with the load to measure voltage

• CT and PT are used together to measure power in a circuit

• The ratio of CT and PT is important for accurate measurement

Solar PV modules convert sunlight into electricity using photovoltaic effect.

• Solar PV modules consist of multiple solar cells connected in series and parallel.

• Each solar cell is made of semiconductor material, usually silicon.

• When sunlight hits the solar cell, it excites the electrons in the semiconductor material, creating a flow of electricity.

• The electricity generated by the solar cells is direct current (DC), which...read more

In Star connection, line voltage is equal to the square root of 3 times phase voltage.

• Line voltage is the voltage between any two line conductors in a three-phase system.

• Phase voltage is the voltage between any line conductor and the neutral point in a three-phase system.

• In a Star connection, all three phases are connected to a common neutral point.

• The relationship between line voltage and phase voltage in Star connect...read more