Indian Oil Corporation Technician Interview Questions and Answers

Current is the flow of electric charge in a circuit.

• Current is measured in Amperes (A)

• It is the rate of flow of electric charge through a conductor

• There are two types of current - AC (alternating current) and DC (direct current)

• Examples of current include the flow of electrons in a wire when a light bulb is turned on

Voltage is the difference in electric potential between two points in a circuit, measured in volts.

• Voltage is the driving force that pushes electric current through a circuit

• It is measured in volts (V)

• Voltage can be positive or negative, depending on the direction of current flow

• Higher voltage means more potential energy available to move electrons

• Example: A battery provides voltage to power a light bulb

Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied across it, and inversely proportional to the resistance of the conductor.

• Ohm's law is expressed as V = I * R, where V is voltage, I is current, and R is resistance.

• It helps in calculating the current flowing through a circuit when the voltage and resistance are known.

• It can also be used to determine the resista...read more

Preventive and corrective maintenance of various electrical equipment including breakers, motors, transformers, and relays.

• Perform regular maintenance on high and low voltage breakers, motors, and transformers.

• Test and calibrate various protection relays for motors, transformers, and generators.

• Conduct transformer oil BDV test, thermal scanning, and earth fault and prediction tests.

• Terminate high voltage motors, instal...read more

Preventive and corrective maintenance of various electrical equipment including breakers, motors, transformers, and relays.

• Perform regular maintenance tasks on high and low voltage breakers, motors, and transformers.

• Test and calibrate protection relays for motors, transformers, and generators.

• Conduct transformer oil BDV tests, thermal scanning, and earth fault and prediction tests.

• Terminate high voltage motors, install...read more

Preventive and corrective maintenance of various electrical equipment including breakers, motors, transformers, switches, relays, and testing/calibration of protections.

• Preventive maintenance of H.V & LV breakers, motors, transformers, switches, etc.

• Corrective maintenance of HV/MV/LV switchgears, breakers, cubicles, etc.

• Testing and calibration of various protection relays for motors, transformers, generators.

• Transforme...read more

Instrumentation equipment refers to devices used to measure, control, and monitor various parameters in industrial processes.

• Instruments like pressure gauges, flow meters, and temperature sensors are commonly used in instrumentation.

• Control valves and actuators are used to regulate the flow of fluids or gases.

• Programmable Logic Controllers (PLCs) are used for automation and control of processes.

• Analytical instruments l...read more

A PLC panel wiring diagram is a visual representation of the electrical connections and components in a programmable logic controller panel.

• A PLC panel wiring diagram shows the layout and connections of various components such as power supplies, input/output modules, relays, and sensors.

• It helps technicians understand how the electrical signals flow within the panel and how different devices are interconnected.

• The diag...read more

A control valve is a device used to regulate the flow of fluid or gas in a process system.

• Control valves are commonly used in industries such as oil and gas, chemical, and power plants.

• They can be operated manually or automatically through an electrical or pneumatic signal.

• Control valves consist of a valve body, actuator, and positioner.

• They can control variables such as flow rate, pressure, temperature, and level.

• Exam...read more

A transmitter is a device used in instrumentation to convert a physical measurement into an electrical signal.

• Transmitters are commonly used in industries such as oil and gas, chemical, and power plants.

• They are used to measure variables such as pressure, temperature, flow rate, level, and pH.

• Transmitters typically consist of a sensing element, signal conditioning circuitry, and an output signal.

• The sensing element det...read more

Flow meters are devices used to measure the flow rate of a fluid or gas.

• Flow meters are commonly used in industries such as oil and gas, water treatment, and manufacturing.

• They can measure flow rates in various units such as liters per minute, cubic meters per hour, or gallons per minute.

• Different types of flow meters include electromagnetic, ultrasonic, turbine, and differential pressure flow meters.

• Flow meters can be...read more