CGI Group Interview Questions and Answers

The primary side of a transformer can be found by checking the voltage rating on the nameplate.

• Check the nameplate for voltage rating

• The higher voltage rating is usually the primary side

• Use a multimeter to confirm the primary side

Calculate the volume of concrete in a pile with a height of 12 meters and a diameter of 350 mm.

• Calculate the radius of the pile by dividing the diameter by 2 (175 mm)

• Calculate the volume of the pile using the formula V = πr^2h

• Convert the diameter and height to meters for consistent units

• Substitute the values into the formula to find the volume of concrete in the pile

The current carrying capacity of Rabbit conductor depends on various factors such as material, size, and temperature.

• Current carrying capacity is influenced by the material of the conductor (e.g. copper, aluminum).

• The size of the conductor (gauge or diameter) also plays a role in determining its current carrying capacity.

• Temperature affects the current carrying capacity of a conductor, with higher temperatures reducing the capacity.

• For Rabbit conductor, the current carrying c...read more

GI material is used for its corrosion resistance and durability in electrical engineering applications.

• GI material (Galvanized Iron) is coated with a layer of zinc to protect against corrosion, making it ideal for outdoor applications.

• It has high durability and can withstand harsh environmental conditions, making it suitable for long-term use.

• GI material is cost-effective compared to other corrosion-resistant materials like stainless steel.

• It is easy to work with and can be w...read more

Generation is the process of producing electricity, transmission is the movement of electricity over long distances, and distribution is the delivery of electricity to consumers.

• Generation involves converting energy sources such as coal, natural gas, or wind into electricity.

• Transmission involves high voltage power lines that transport electricity over long distances from power plants to substations.

• Distribution involves lower voltage power lines that deliver electricity from...read more

Corona effect is the phenomenon of ionization and luminous discharge around a conductor carrying high voltage in air.

• Occurs when the electric field strength around a conductor exceeds the breakdown strength of air

• Results in ionization of air molecules and formation of a luminous discharge or corona

• Can cause power loss, radio interference, and damage to equipment

• Examples include the hissing sound from high voltage power lines and the glow around lightning rods

Mixing ratio of concrete refers to the proportion of cement, sand, and aggregate used in the concrete mix.

• The most common mixing ratio for concrete is 1:2:4, which means 1 part cement, 2 parts sand, and 4 parts aggregate.

• Other ratios like 1:1.5:3 and 1:3:6 are also used depending on the strength and durability requirements of the concrete.

• Water is added to the mix to achieve the desired consistency and workability.

• Proper mixing of the ingredients is crucial to ensure the stre...read more

MCB stands for Miniature Circuit Breaker. It is a device designed to protect electrical circuits from overloads and short circuits.

• MCB ratings are typically in multiples of 6, such as 6A, 10A, 16A, 20A, etc.

• The rating of an MCB should be selected based on the maximum current that the circuit can safely handle.

• For example, a lighting circuit may use a 6A MCB, while a power socket circuit may use a 16A MCB.

• MCBs have a breaking capacity, which indicates the maximum fault current...read more