CGI Group 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

VFD stands for Variable Frequency Drive. It is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the motor.

• VFDs are used to control the speed and torque of AC motors in various applications.

• They work by converting fixed frequency and voltage AC power to adjustable frequency and voltage output.

• VFDs can help save energy by matching motor speed to the actual load requirements.

• Common applications of VFDs include HVAC systems...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 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.