Rheinmetall Automotive Interview Questions, Process, and Tips

Star delta starter is a type of reduced voltage starter used for starting high power motors.

• Consists of two contactors - one for star connection and one for delta connection

• Reduces starting current and torque to prevent damage to motor windings

• Commonly used for motors with high starting current requirements, such as induction motors

Hysteresis loss can be calculated using the area enclosed by the hysteresis loop on a B-H curve.

• Calculate the area enclosed by the hysteresis loop on a B-H curve

• Use the formula: Hysteresis Loss = ∮B.dH

• Consider the material's properties and operating conditions for accurate calculation

Skin effect is the tendency of alternating current to flow near the surface of a conductor, due to self-inductance.

• Skin effect is more prominent at higher frequencies.

• It causes the effective resistance of the conductor to increase.

• Skin effect can be reduced by using hollow conductors or by using stranded conductors.

• Example: Skin effect is a common phenomenon in high-frequency transmission lines.

Fluorescent effect is the emission of light by a substance that has absorbed light or other electromagnetic radiation.

• Fluorescent effect occurs when a substance absorbs light at a specific wavelength and then re-emits light at a longer wavelength.

• Common examples include fluorescent light bulbs, glow-in-the-dark materials, and certain minerals that glow under UV light.

• Fluorescent materials can be used in various applica...read more

In a parallel circuit, components are connected in separate branches, allowing current to flow through multiple paths. In a series circuit, components are connected in a single path, where current flows through each component in sequence.

• Parallel circuit allows current to flow through multiple paths, while series circuit has only one path for current.

• In a parallel circuit, voltage across each component is the same, whi...read more

Modal analysis is a technique used to study the dynamic behavior of structures by identifying their natural frequencies and mode shapes.

• Modal analysis helps in understanding how a structure will respond to dynamic loads.

• It involves calculating the natural frequencies and mode shapes of a structure.

• Modal analysis is commonly used in structural engineering, aerospace engineering, and mechanical engineering.

• The results of...read more

The number of frequencies should be chosen based on the complexity of the model and the desired level of accuracy.

• Consider the size and complexity of the model - more frequencies may be needed for intricate geometries

• Balance between computational time and accuracy - higher number of frequencies increases computation time

• Perform convergence studies to determine the minimum number of frequencies required for accurate res