CMA CGM Interview Questions and Answers

Corona loss in electrical network is the loss of power due to the ionization of air surrounding high voltage conductors.

• Corona loss occurs when the electric field around a conductor is high enough to ionize the air, creating a conductive path and causing power loss.

• It is more prominent at high voltages and frequencies, leading to audible noise, radio interference, and power loss.

• Corona loss can be reduced by increasing conductor size, spacing between conductors, or using coro...read more

Circuit is a closed loop of components while network is a collection of interconnected circuits.

• Circuit is a closed loop of components while network is a collection of interconnected circuits

• Circuits have a specific function or purpose, while networks can be used for various purposes

• Examples of circuits include a simple light bulb circuit, while examples of networks include the internet or a power grid

Earthing is the process of connecting the non-current carrying part of the equipment to the earth, while grounding is the process of connecting the current carrying part of the equipment to the earth.

• Earthing is used to protect against fault currents and lightning strikes.

• Grounding is used to provide a path for fault currents to flow safely to the earth.

• Earthing is typically done by connecting the metal casing of electrical equipment to the earth using a wire or rod.

• Grounding...read more

Transformers work on the principle of electromagnetic induction, with losses including copper losses and core losses.

• Transformers work on the principle of electromagnetic induction, where a changing magnetic field induces a voltage in a coil.

• Copper losses occur due to resistance in the windings, leading to heat generation.

• Core losses include hysteresis losses (energy lost due to magnetization and demagnetization of the core material) and eddy current losses (energy lost due t...read more

Transformers are devices that transfer electrical energy between two or more circuits through electromagnetic induction.

• Transformers consist of two coils of wire, known as the primary and secondary coils, wrapped around a core typically made of iron or steel.

• When an alternating current flows through the primary coil, it creates a changing magnetic field which induces a voltage in the secondary coil.

• The ratio of the number of turns in the primary coil to the number of turns in...read more

An oscillator circuit generates a continuous output signal without any input signal.

• An oscillator typically consists of an amplifier and a feedback network.

• Common types of oscillators include LC oscillators, crystal oscillators, and relaxation oscillators.

• Example: A simple LC oscillator circuit consists of an inductor and a capacitor connected in parallel with an amplifier.

A synchronous motor is a type of AC motor in which the rotation of the shaft is synchronized with the frequency of the supply current.

• Synchronous motors operate at a constant speed determined by the frequency of the electrical supply.

• They are used in applications where precise speed control is required, such as in industrial processes and power generation.

• Synchronous motors are more efficient than induction motors at higher speeds.

• Examples of synchronous motors include brushl...read more

A motor converts electrical energy into mechanical energy, while a generator converts mechanical energy into electrical energy.

• Motor uses electricity to produce motion, while generator uses motion to produce electricity

• Motors are used in appliances like fans and refrigerators, generators are used in power plants

• Motors have a rotor that spins inside a stator, generators have a stator that surrounds a rotor