20+ Multi Skill Technician Interview Questions and Answers

Different types of breakers with their ratings, applications, and working principles.

• Circuit Breaker: Used in electrical power systems to protect circuits from overloads and short circuits.

• Molded Case Circuit Breaker (MCCB): Rated up to 1,000 amps, commonly used in residential and commercial applications.

• Miniature Circuit Breaker (MCB): Rated up to 125 amps, used in low-voltage electrical systems.

• Air Circuit Breaker (ACB): Rated up to 6,000 amps, used in large-scale industria...read more

To maintain site electrical equipment like DG, Transformer, Ups, LT & HT panel, I have 5 years of experience.

• Regularly inspect and clean the equipment to ensure proper functioning.

• Perform preventive maintenance tasks such as lubrication, tightening connections, and checking for any signs of wear or damage.

• Conduct regular testing and calibration of equipment to ensure accuracy and efficiency.

• Monitor and record equipment performance, noting any abnormalities or deviations.

• Troub...read more

3-phase power supply has 3 alternating currents while 1-phase has only 1.

• 3-phase power supply is more efficient for high-power applications

• 1-phase power supply is commonly used for household appliances

• 3-phase power supply requires 3 wires while 1-phase requires only 2 wires

• 3-phase power supply is more expensive to install than 1-phase

Earthing and grounding are terms used interchangeably, but they have different meanings. Earthing refers to the connection of a conductor to the earth, while grounding refers to the connection of a conductor to a ground.

• Earthing is used to protect people and equipment from electrical shock by providing a low-impedance path for fault current to flow to the earth.

• Grounding is used to protect equipment from electrical noise and interference by providing a low-impedance path for ...read more

The single line diagram of MSEB power supply shows the electrical connections and components in a simplified manner.

• It displays the power system from the point of view of a single line

• It shows the distribution of power from the source to the load

• It includes transformers, circuit breakers, switches, and other components

• It helps in understanding the flow of electricity and identifying potential issues

• Example: The single line diagram of MSEB power supply may show a substation re...read more

In case of a battery blast in a UPS battery bank, it is important to follow safety protocols to prevent injuries and damage.

• Immediately evacuate the area to ensure safety of personnel

• Contact emergency services if necessary

• Do not attempt to handle the battery or extinguish the fire yourself

• Ensure proper ventilation to prevent toxic fumes from spreading

• Investigate the cause of the blast to prevent future incidents

Single phase has one alternating current waveform, while 3 phase has three alternating current waveforms.

• Single phase has two wires, while 3 phase has three or four wires

• Single phase is used for small household appliances, while 3 phase is used for heavy machinery

• Single phase has a lower power output compared to 3 phase

• Examples of single phase appliances include fans, refrigerators, and air conditioners, while examples of 3 phase machinery include pumps, compressors, and moto...read more

Technical knowledge refers to the understanding and proficiency in various technical skills and concepts.

• Technical knowledge encompasses a wide range of skills and expertise in a specific field or industry.

• It involves understanding and applying technical principles, theories, and concepts.

• Examples of technical knowledge can include programming languages, operating systems, troubleshooting techniques, and equipment maintenance.

• Technical knowledge is essential for performing ta...read more

Safety permits are documents that authorize specific activities or operations to ensure safety compliance. DG set is a diesel generator set. ETP stands for Effluent Treatment Plant. HVAC stands for Heating, Ventilation, and Air Conditioning.

• Safety permits are required for tasks like hot work, confined space entry, electrical work, etc.

• Examples of safety permits include hot work permit, confined space entry permit, electrical work permit, etc.

• DG set is a backup power source th...read more

Single phase supply has one live wire and one neutral wire, while 3 phase supply has three live wires and one neutral wire.

• Single phase supply is used for smaller loads like household appliances, while 3 phase supply is used for larger industrial equipment.

• Single phase supply has a sinusoidal waveform, while 3 phase supply has three overlapping sinusoidal waveforms with a phase difference of 120 degrees.

• Single phase supply is more common in residential areas, while 3 phase su...read more

There are several types of starters used to control motors, including direct-on-line starters, star-delta starters, and soft starters.

• Direct-on-line starters provide full voltage to the motor, allowing it to start quickly.

• Star-delta starters initially connect the motor in a star configuration to reduce the starting current, and then switch to a delta configuration for normal operation.

• Soft starters gradually increase the voltage supplied to the motor, reducing the starting cu...read more

VFD stands for Variable Frequency Drive. Its purpose is to control the speed and torque of an electric motor.

• VFDs are used to save energy by adjusting the motor speed to match the load requirements.

• They provide smooth starting and stopping of motors, reducing mechanical stress.

• VFDs allow for precise control of motor speed, enabling better process control.

• They can be used to optimize motor performance and extend motor life.

• VFDs are commonly used in HVAC systems, pumps, fans, a...read more

HVAC stands for Heating, Ventilation, and Air Conditioning. It is a technology used for indoor and vehicular environmental comfort.

• HVAC systems regulate temperature, humidity, and air quality in buildings and vehicles.

• They consist of various components such as furnaces, air conditioners, heat pumps, ductwork, and thermostats.

• HVAC technicians install, maintain, and repair these systems.

• They also ensure that the systems are energy-efficient and comply with safety regulations.

• Ex...read more

DG stands for Diesel Generator. It is a type of generator that uses diesel fuel to produce electrical energy.

• DG is commonly used as a backup power source in case of power outages.

• It consists of an engine that runs on diesel fuel and a generator that converts mechanical energy into electrical energy.

• DGs are often used in industries, commercial buildings, hospitals, and residential areas.

• They are known for their reliability, durability, and ability to provide continuous power s...read more

Controlling refers to the process of regulating or managing the operation of a system or equipment.

• Controlling involves setting parameters and adjusting them as needed to achieve desired outcomes.

• In electrical systems, controlling may involve adjusting voltage, current, or frequency.

• Examples of controlling in electrical systems include using a thermostat to regulate temperature, or using a dimmer switch to adjust lighting levels.

• Controlling can also involve monitoring and adj...read more

Socket points are electrical outlets where plugs can be inserted to connect to a power source.

• Socket points are also known as electrical receptacles or power outlets.

• They are typically found on walls and provide a safe and convenient way to access electricity.

• Different countries may have different types of socket points, such as the Type A, B, C, D, E, F, G, H, I, J, K, L, M, and N.

• Examples of devices that can be plugged into socket points include lamps, chargers, and applian...read more

Maintenance of battery bank system involves regular inspections, testing, and cleaning to ensure optimal performance and longevity.

• Regularly inspect battery terminals for corrosion and clean if necessary

• Perform routine capacity testing to ensure batteries are functioning properly

• Check for any signs of leaks or damage and address promptly

• Monitor charging levels and adjust as needed to prevent overcharging or undercharging

• Keep detailed records of maintenance activities and batt...read more

There are several types of AC units commonly used, including window AC, split AC, central AC, portable AC, and ductless mini-split AC.

• Window AC

• Split AC

• Central AC

• Portable AC

• Ductless mini-split AC

Diesel generators come in various types based on their application and size.

• Types of diesel generators include standby, prime, and continuous duty

• Standby generators are used as backup power in case of outages

• Prime generators are used for extended periods of time

• Continuous duty generators are designed for continuous operation

• Examples of diesel generator brands include Cummins, Caterpillar, and Kohler

A star delta single line diagram is a graphical representation of the electrical connections and components in a star delta motor control circuit.

• A star delta single line diagram shows the power supply, motor, contactors, overload relays, and control circuit components.

• The diagram illustrates the switching between star and delta configurations for starting and running the motor.

• It helps in understanding the electrical connections and troubleshooting the circuit.

• Example: L1, L...read more

Handling all types of diesel generators (d.g.)

• Regular maintenance and servicing of d.g. sets

• Troubleshooting and repairing any issues with d.g. sets

• Knowledge of different types and models of d.g. sets

• Ensuring proper functioning of d.g. sets during power outages

• Following safety protocols while working with d.g. sets