10+ Maintenance Executive Interview Questions and Answers for Freshers

Preventive maintenance schedule for transformers includes regular inspections, testing, cleaning, and servicing to ensure optimal performance and prevent breakdowns.

• Inspecting transformer oil levels and quality regularly

• Testing insulation resistance and conducting power factor tests

• Cleaning cooling fans and ensuring proper ventilation

• Checking for loose connections and signs of overheating

• Servicing bushings, tap changers, and other components as needed

Voltage and power are related as power is equal to voltage multiplied by current.

• Power is the rate at which energy is transferred or converted.

• Voltage is the electric potential difference between two points.

• Power is equal to voltage multiplied by current.

• Increasing voltage will increase power if current remains constant.

• Decreasing voltage will decrease power if current remains constant.

UPS works by converting AC power to DC power, storing it in batteries, and then converting it back to AC power when needed.

• UPS takes in AC power from the mains supply

• The AC power is converted to DC power using a rectifier

• The DC power is stored in batteries for backup power

• When there is a power outage, the DC power is converted back to AC power using an inverter

• The connected devices receive uninterrupted power during outages

Machine installation process involves planning, preparation, installation, testing, and commissioning.

• Plan the installation process including scheduling, resource allocation, and safety measures.

• Prepare the site by ensuring proper foundations, utilities connections, and space requirements.

• Install the machine components according to manufacturer's instructions and technical specifications.

• Test the machine for functionality, performance, and safety compliance.

• Commission the mac...read more

Common engine faults in HD trucks include overheating, oil leaks, and worn out components.

• Overheating due to coolant leaks or malfunctioning cooling system

• Oil leaks from gaskets, seals, or worn out components

• Worn out components such as piston rings, bearings, and valves

• Fuel system issues such as clogged filters or injectors

• Electrical problems with sensors, wiring, or ignition system

• Exhaust system problems such as clogged filters or damaged pipes

• Turbocharger issues such as wor...read more

Star delta starter is used to reduce the starting current of induction motors.

• Consists of three contactors and a timer

• During starting, motor is connected in star configuration to reduce current

• After a set time, contactors switch to delta configuration for normal operation

Fluorescent lamp connection involves a ballast, starter, and two pins on each end of the lamp.

• The ballast regulates the current and voltage to the lamp.

• The starter provides a high voltage to initiate the lamp's arc.

• The two pins on each end of the lamp connect to the lamp holder.

• The lamp holder provides power to the lamp and holds it in place.

• The wiring should be done according to the manufacturer's instructions.

Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points.

• Ohm's law is represented by the equation I = V/R, where I is the current, V is the voltage, and R is the resistance.

• It is named after Georg Simon Ohm, a German physicist who first formulated this law.

• This law is applicable to all types of circuits, including AC and DC circuits.

• It is used to calculate the current, voltage, or resistance in a ci...read more

AHU (Air Handling Unit) works by circulating and conditioning air within a building to maintain a comfortable environment.

• AHU draws in outside air through intake vents

• Air passes through filters to remove dust and particles

• Air is then heated or cooled by coils before being distributed through ducts

• Return air is recirculated to maintain temperature and humidity levels

• AHU may also include humidifiers, dehumidifiers, and air purifiers for additional conditioning

A line diagram of HVAC shows the flow of air and refrigerant through the system.

• Shows the components of the HVAC system such as air handler, ductwork, and condenser unit

• Illustrates the direction of airflow and refrigerant flow

• Helps in understanding how the system operates and how components are connected

PLC stands for Programmable Logic Controller and HMI stands for Human Machine Interface.

• PLC is a digital computer used for automation of electromechanical processes.

• It is designed to control machinery and perform various tasks based on input from sensors and other devices.

• PLCs are widely used in industrial applications such as manufacturing, power plants, and transportation systems.

• HMI is a graphical interface that allows humans to interact with machines or systems.

• It provide...read more