Engineering Concepts Assessment

What are the key mechanical properties of materials?

• Thermal conductivity

• Tensile strength, compressive strength, shear strength, elasticity, plasticity, toughness, hardness, fatigue resistance.

• Electrical resistance

• Magnetic permeability

How does temperature affect the tensile strength of materials?

• Temperature affects tensile strength by decreasing it at high temperatures and potentially increasing it at low temperatures.

• Temperature has no effect on tensile strength.

• Tensile strength increases at high temperatures.

• Low temperatures always decrease tensile strength.

Explain the difference between static and dynamic control systems.

• Dynamic control systems have fixed parameters; static systems have changing parameters.

• Static control systems have fixed parameters; dynamic control systems have changing parameters.

• Static control systems can adapt to changes in real-time while dynamic systems cannot.

• Static control systems are always more efficient than dynamic systems.

What is the purpose of feedback in control systems?

• To eliminate the need for a desired input altogether.

• The purpose of feedback in control systems is to maintain stability and accuracy by adjusting the system's output based on the difference between the actual output and the desired input.

• To provide random variations in the system's performance.

• To increase the system's output without any adjustments.

Describe the finite element method in structural analysis.

• The finite element method is used exclusively for fluid dynamics analysis.

• The finite element method is a graphical technique for visualizing structures.

• The finite element method involves analyzing entire structures without dividing them into smaller parts.

• The finite element method is a numerical technique for structural analysis that divides a structure into smaller elements to analyze their behavior under loads.

What is the significance of load distribution in structural analysis?

• Load distribution is only important for aesthetic purposes.

• Load distribution is significant as it ensures safety, stability, and efficient material use in structures.

• Load distribution has no impact on the cost of materials.

• Load distribution is irrelevant in small structures.

How do you determine the yield strength of a material?

• The yield strength is calculated using the material's density.

• The yield strength is found by measuring the material's temperature.

• The yield strength is determined from the stress-strain curve during a tensile test, specifically at the point of permanent deformation.

• The yield strength is determined by the material's color.

What are the main components of a control system?

• Sensor, Controller, Actuator, Feedback Loop

• Sensor Array

• Data Logger

• Power Supply

Explain the concept of stress and strain in materials.

• Stress is the force per unit area, while strain is the deformation per unit length.

• Stress and strain are unrelated concepts in physics.

• Strain is the amount of force applied to a material.

• Stress is the total weight of a material.

What techniques are used to analyze the stability of structures?

• Static analysis, dynamic analysis, finite element analysis (FEA), modal analysis, limit equilibrium method.

• Geotechnical analysis

• Thermal analysis

• Hydraulic analysis