Dark Bears Interview Questions and Answers

The 8 main pillars of engineering mechanics are statics, dynamics, mechanics of materials, fluid mechanics, thermodynamics, heat transfer, control theory, and biomechanics.

• Statics deals with forces and their effects on stationary objects.

• Dynamics deals with forces and their effects on moving objects.

• Mechanics of materials deals with the behavior of solid objects subjected to stresses and strains.

• Fluid mechanics deals with the behavior of fluids and gases in motion.

• Thermodynam...read more

The boundary conditions of my project are the limitations and constraints that define the scope of the project.

• Boundary conditions are the external factors that affect the project

• They define the limits of the project and what is within scope

• Examples include budget, time, resources, and legal requirements

• Boundary conditions must be considered when planning and executing the project

h-method uses hierarchical basis functions while p-method uses polynomial basis functions in FEA.

• h-method uses a fixed number of elements with varying degrees of freedom while p-method uses a fixed number of degrees of freedom with varying elements.

• h-method is suitable for problems with singularities while p-method is suitable for problems with smooth solutions.

• h-method is computationally efficient for problems with low regularity while p-method is computationally efficient f...read more

T-s diagram of reheating cycle

• Reheating cycle is a modification of the Rankine cycle

• It involves two turbines and one reheater

• The T-s diagram consists of four processes: 1-2, 2-3, 3-4, and 4-1

• The first turbine expands the steam from high pressure to intermediate pressure (process 1-2)

• The steam is then reheated in the reheater at constant pressure (process 2-3)

• The second turbine expands the steam from intermediate pressure to low pressure (process 3-4)

• The steam is then condense...read more

Centrifugal pump works on the principle of converting mechanical energy into hydraulic energy.

• The pump has an impeller that rotates and creates a centrifugal force to move the fluid.

• The fluid enters the pump through the suction nozzle and is accelerated by the impeller.

• The kinetic energy of the fluid is then converted into pressure energy as it passes through the volute casing.

• The pressure energy is then used to move the fluid through the discharge nozzle.

• Centrifugal pumps ar...read more

Machines are man-made devices that perform specific tasks, while structures are built to support loads and resist forces.

• Machines are designed to perform a specific function, such as a car engine or a washing machine.

• Structures are built to support loads and resist forces, such as bridges or buildings.

• Machines are typically made up of moving parts, while structures are typically made up of stationary parts.

• Machines require a power source to operate, while structures do not.

• Ex...read more

Regenerative cycle uses heat exchangers to recover heat from exhaust gases while reheating cycle reheats steam between turbine stages.

• Regenerative cycle improves efficiency by preheating the feedwater using exhaust gases.

• Reheating cycle reduces moisture content in steam and increases efficiency.

• Regenerative cycle is used in gas turbines while reheating cycle is used in steam turbines.

• Both cycles aim to increase the efficiency of power generation.

• Regenerative cycle is more eff...read more