10+ Repair Engineer Interview Questions and Answers

A tube light works by passing an electric current through a gas-filled tube, causing the gas to emit light.

• Tube light contains a gas-filled tube with electrodes at each end.

• When electricity is applied, the gas inside the tube becomes ionized and emits ultraviolet light.

• The ultraviolet light then interacts with the phosphor coating on the inside of the tube, producing visible light.

• Circuit diagram includes a ballast to regulate the current and a starter to initiate the flow of...read more

Basic components of electrical & electronics include resistors, capacitors, inductors, diodes, transistors, and integrated circuits.

• Resistors: limit current flow

• Capacitors: store and release electrical energy

• Inductors: store energy in a magnetic field

• Diodes: allow current to flow in one direction

• Transistors: amplify or switch electronic signals

• Integrated circuits: contain multiple components on a single chip

Star Delta Connection is a method used to connect electric motors for reducing starting current.

• Star Delta Connection involves connecting the motor windings in a star configuration during starting and then switching to a delta configuration once the motor reaches a certain speed.

• It is commonly used in applications where the starting current needs to be limited to prevent damage to the motor or the electrical system.

• This method is often used for large induction motors in indus...read more

I completed several college projects with diagrams showcasing my repair engineering skills.

• One project involved designing and repairing a circuit board with detailed diagrams of the components and connections.

• Another project focused on troubleshooting and fixing a malfunctioning electronic device, with before and after diagrams of the repair process.

• I also worked on a project where I analyzed and repaired mechanical systems, creating diagrams to illustrate the repair steps ta...read more

A contactor is an electrical device used to control the flow of electricity in a circuit by opening and closing contacts.

• Contactor is typically used in high-power applications to control motors, lighting, heating, and other electrical loads.

• It consists of a coil that when energized creates a magnetic field, pulling in contacts to make or break the circuit.

• Contactor can be controlled manually, automatically, or remotely depending on the application.

• Examples of contactors inclu...read more

Motherboard is the main circuit board of a computer that connects all the components together.

• It contains the CPU socket, RAM slots, expansion slots, and other connectors.

• It provides power to the components and allows communication between them.

• It determines the compatibility of the components that can be used with the computer.

• Examples of motherboard manufacturers are ASUS, Gigabyte, MSI, and ASRock.

A rectifier is an electrical device that converts alternating current (AC) to direct current (DC).

• Rectifiers are commonly used in power supplies to convert AC voltage to DC voltage.

• They are made up of diodes, which allow current to flow in only one direction.

• Rectifiers can be half-wave or full-wave, depending on the number of diodes used.

• Examples of rectifiers include bridge rectifiers, vacuum tube rectifiers, and solid-state rectifiers.

CMOS functions by using both NMOS and PMOS transistors to create logic gates and memory cells.

• CMOS stands for Complementary Metal-Oxide-Semiconductor

• It uses both NMOS (n-type) and PMOS (p-type) transistors to create logic gates and memory cells

• CMOS technology is widely used in digital integrated circuits due to its low power consumption and high noise immunity

A contactor is an electrical device used to control the flow of electricity in a circuit by opening and closing contacts.

• Contactor is typically used to control motors, lighting, heating, and other electrical loads.

• It consists of a coil, contacts, and an enclosure.

• Contactor contacts can be normally open (NO), normally closed (NC), or changeover.

• Examples of contactor brands include Siemens, Schneider Electric, and ABB.

Aero engines work by sucking in air, compressing it, adding fuel, igniting the mixture, and then exhausting the resulting gases to create thrust.

• Air is sucked in through the intake

• The air is compressed in the compressor section

• Fuel is added and ignited in the combustion chamber

• The resulting hot gases expand and pass through the turbine section

• The exhaust gases exit the engine, creating thrust

IGBT stands for Insulated Gate Bipolar Transistor, a type of power semiconductor device used in various electronic applications.

• IGBT is a three-terminal power semiconductor device that combines the high-speed switching capability of a MOSFET with the high-voltage and high-current handling capabilities of a bipolar transistor.

• It is commonly used in applications such as motor drives, inverters, power supplies, and electric vehicles.

• IGBTs are known for their efficiency, fast swi...read more

A MOSFET is a type of transistor used for amplifying or switching electronic signals.

• MOSFET stands for Metal-Oxide-Semiconductor Field-Effect Transistor.

• It is commonly used in electronic devices for power amplification and switching.

• MOSFETs have three terminals: gate, source, and drain.

• They are known for their high input impedance and fast switching speeds.

• Examples of MOSFET applications include power supplies, motor control, and audio amplifiers.

A half wave rectifier is a simple electronic circuit that converts AC voltage to pulsating DC voltage.

• Consists of a diode connected in series with a load resistor

• Allows only the positive half cycle of the input AC signal to pass through

• Output voltage is the same as the input voltage during the positive half cycle