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1.What are the characteristics that keep solid and fluid different

When the force is applied tangentially on solid then it experiences a finite deformation and shear stress that is proportional to the deformation. Whereas, when the same shear stress is applied on the surface of fluid then it experiences continuous increasing deformation where, the shear stress is proportional to the rate of change of deformation The fluid dynamic is dividend in three different areas. They are as follows: Hydrodynamics (flow of liquids), Gas dynamics (flow of gases) and Aerodynamics (flow of air). Whereas, the state of, solid doesn’t represent any of the stages 

2.What are the objectives of Aerodynamics

Aerodynamics deals with the theory of flow of air and it has many practical applications in engineering. There are some objectives that are being used in aerodynamics and these are as follows 

It is used to predict the forces, moments and heat transfer from the bodies that is moving through the liquid It deals with the movement of wings or use of the wind force. This way it requires the calculations to be done for the aerodynamic heating of the flight vehicles and the hydrodynamic forces applied on the surface of the vehicle

It is used to determine the flows that are moving internally through ducts. This way it makes the calculations and measurement of the flow properties that is inside the rocket and jet engines 

3.What are the sources involved in aerodynamics

There are two sources that are involved in the case of aerodynamics forces and moments that are on the body. These forces are as follows 

Pressure distribution: this is the distribution that is over the body surface Shear stress distribution: this is the distribution that is over the body surface These sources are for the body shapes and it doesn’t matter how complex they are. The mechanism that is being used to communicate with the bodies that is moving through a fluid. Both the pressure (p) and shear stress (?) having the dimension force per unit area. This helps the movement of the body through the fluid 

4.What are the conditions given for the two flows to be dynamically similar To measure the dynamicity of the two flows consider two different flow fields over two different bodies. This way the conditions that get generated are as follows 

The streamlined pattern shouldn’t be geometrically similar The distribution of the volume over change in volume (V/V8), pressure over change in pressure (p/p8), and time over change in time (T/T8). These changes take place throughout the flow of the field and they remain the same against the common non-dimensional coordinates The force coefficient remains the same There is a similarity in both the flows like the solid boundaries are geometrically similar for both flows

5.What are the differences between continuum flow and free molecule flow 

The flow that is moving over the body i.e. in a circular cylinder of diameter d is the continuum flow, whereas the flow that consists of individual molecules moving in random motion is the free molecule flow The mean free path (?) defines the mean distance between the collisions of the molecule and if this path (?) is smaller than the scale of the body measured (d) then the flow of the body is considered as continuum flow

6.What are the differences between inviscid and viscous flow 

Viscous flow is the flow in which the molecule moves in random fashion and transfers their mass, momentum and energy from one place to another in fluid. Whereas, an inviscid flow is the flow in which there is no involvement of friction, thermal conduction or diffusion while the molecules are moving

Inviscid flow consists of the limited influence of friction, thermal conduction and diffusion that is limited to thin region that is limited to the body surface. Whereas, the viscous flows involve the flows that dominates the aerodynamics of the blunt bodies like cylinder. In this the flow expands around front face of cylinder and it separates from the rear surface of it 

7.What are the differences between incompressible and compressible flows 

Incompressible flows are the flows that have a constant density (?). Whereas, the compressible flows are those that consists of variable densities

The flows that exist are compressible in nature. Whereas, incompressible flows, doesn’t exist in nature or are very rare Incompressible flows are used to model aerodynamic problems without loosing any detrimental accuracy i.e. most problems that exist in hydrodynamics considers the density (?) = constant. Whereas, compressible flow is hardly used as a mathematical model to, represent the hydrodynamics

High speed flows are and must be treated as compressible, whereas incompressible flows are not considered for high speed flows 

8.What are the different speed types of flows used in identifying Mach number

There are four types of flows that consist of different speeds and can be identified using Mach number Subsonic flow where M<1 everywhere, this is a field that is defined as subsonic if it matches the Mach number that is less than 1 at every point. These are displayed by smooth streamlines that consists of no discontinuity in slope. The flow velocity is everywhere less than the speed of sound and the disturbances are all around the flow field Transonic flow, where mixed regions exist and M<1 or M>1, this is a flow field that defines that the M8 is increased just above the unity and it is formed in front of the body. These are the mixed subsonic and supersonic flows that are influenced by both the flows Supersonic flow where M>1 everywhere, this type is defined when Mach number is greater than 1 at every point. They are represented by the presence of shock waves across which the flow properties and streamlines changes discontinuously

Hypersonic flow where the speed is greater than supersonic, this is defined when the shock waves moves closer to the body surface and the strength of the shockwave increases leading to higher temperatures between the shock and body surface

9.What are the major sectors involved in aircraft maintenance There are two major sectors involved in aircraft maintenance and these are handled by certifying technician in the field of support and maintenance. These are divided into two sectors as 

Category B1 (mechanical)these are the maintenance technicians that have good knowledge regarding the working of airframe, engine, electrical power systems and equipment. It also requires additional knowledge of aircraft structures and materials Category B2 (avionic)this deals with the integrated knowledge of aircraft equipments, electrical, instrument and radar related systems. They undergo proper training to handle the aircraft equipments and gain practical experience to deal with day to day activities 

10.What are the operations performed by Category B technicians

Category B consists of two sectors in the field of maintenance and they are divided in B1 and B2 with certain roles. The operations performed by Category B technicians are as follows 

Activities related to scheduled on field inspections for aircraft maintenance Activities of complex rectification Fault diagnosis on aircraft systems and their equipments Modification and performing special instruction to monitor and manage the system Repairing of airframe and other aircrafts

Activities performed like removal of aircraft components and fitting the required parts Use of BITE (built-in test equipment) and diagnostic equipments to perform repair tasks Supervising and certifying the work of other technicians involved in it 

11.What is the main source of power in aircraft

The main source of power is the hydraulic motor that is provided by the scheduled service and involves operations that allow technicians to solve complex system problems. This setup required certifying the technician to operate all the system the same way as it is been done with one system. The hydraulic motor needs to be operated the same way and maintained in a proper way. The alignment need to in synchronization with the aircraft auxiliary power unity (APU) before anything is done with the aircraft positioning. A standard need to, be followed to maintain the aircrafts and its parts equipped and working

12.What are the differences in the job performed by line maintenance certifying staff and base maintenance certifying staff The difference that exists between the two is that line maintenance certifying staff has the responsibility to inspect, rectify and perform the related or associated maintenance activities on the aircraft on the airfield. Whereas, the base maintenance certifying staff, perform the maintenance activities away from the live aircraft areas. The maintenance that is being performed by the line maintenance staff is restricted to use limited tools, and equipments that are present on the site to perform the first line diagnostic maintenance. Whereas, Base maintenance certifying staff is associated with the line maintenance staff as it requires inspecting and performing complex modification in the aircraft carriers

13.What is the role performed by Category C personnel in maintenance of aircraft

Category C personnel are responsible for maintaining the management role of controlling the progress of the base maintenance inspections and seeing the work that is getting performed. These handle the category B and category A staff and monitor their work. They are responsible for ensuring the good work that will be carried out by providing the certification of maintenance. Category C personnel upon the completion of the maintenance job done by the base maintenance staff provides the certificate to allow the servicing of the aircraft to proceed. This way the people working in the staff become eligible to perform and provide services for flight

14.What are the safety recommendations required while maintaining aircraft The safety recommendations are required while dealing with the accidents and the inquiry of the aircrafts. The recommendations needed are as follows 

CAA (Civil aviation authority) examines the applicability of self-certification of aircraft engineering and verifies the criticality of the tasks that need to be performed on the system. They also check the system for further services without doing any functional checks Review of the system takes place to interpret the single components of the aircraft that is vital in its design Reviewing of the quality assurance system and the reporting methods take place to encourage more better designs to be provided for the use Reviewing the need to, introduce a format of job description and grades that is being provided to the engineers and managers Providing a mechanism for an independent assessment to carry out the work audit and operations can be performed smoothly 

15.What are the different stress types present in aircraft operations Stress is a result that is caused when a solid e.g. metal bar is subjected to an external force. Stress is defined as force per unit area and the basic unit includes MN/m2, N/mm2 and Pa. There are basically three types of stress 

Tensile stress: it is the stress that is setup when the force tries to pull the material apart Compressive stress: it is the stress that is produced by the force that is trying to crush the material Shear stress: is the stress that results from the force that tends to cut through the material i.e. tend to put one material slide over another one 

16.Why is strain a major factor in aircraft engineering

Strain is when a material is altered in shape, this happens due to the fact that the force is acting on the material. The body is strained internally as well as externally without having any differences of dimension but it just has the differences at the atomic level. It is the ratio of change in dimension over the original dimension. It is very important due to the fact that building an aircraft requires the knowledge of these factors and the formulas that are associated with it to successfully implementing the parts together. There are three types of strain 

Tensile strain

Compressive strain and

Shear strain

17.What are the different types of modulus involved in mechanics

Modulus of elasticity is given by the Hooke’s law that states that stress is directly proportional to strain, while the material remains elastic. The external forces that are acting on the material is just having the sufficient to stretch the atomic bonds this way the material can also return back to the original shape. The different types of modulus are as follows 

Modulus of rigidity: this defines the relationship between the shear stress (t ) and shear strain (? ) Bulk modulus: this defines that if a body volume v is subjected to an increase in an external pressure then the volume will be changed by dV, this deformation will be change in volume not in shape 

18.What are the mechanical properties required to know before performing maintenance

The mechanical properties provide the definition of the behavior of the material that is being put under the action of external forces. This is an important aspect to aeronautical engineering that is also used to gain knowledge for applications developed for aircrafts. This provides an overall view of the structure of the aircraft and the maintenance aspect of it. The properties used are as follows 



Specific strength and stiffness,



Malleability and elasticity

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