AE1005 Wind Tunnel Techniques B.E Question Bank : sriengg.com

Name of the College : Srinivasan Engineering College
University : Anna University
Department : Aeronautical Engineering
Degree : B.E
Subject Code/Name : AE1005 Wind Tunnel Techniques
Year : 3rd
Semester : 6th
Document Type : Question Bank
Website : sriengg.com

Download Model/Sample Question Paper :
Part-A : https://www.pdfquestion.in/uploads/sr…WT-2-MARKS.pdf
Part-B : https://www.pdfquestion.in/uploads/sr…T-16-MARKS.pdf

Sri Engg Wind Tunnel Techniques Question Paper

UNIT – 1

1. Define Mach Number? :
It’s defined as the square root of the ratio of the inertia force of a flowing fluid
to the elastic force.

Related : Srinivasan Engineering College AE2253 Production Technology B.E Question Bank : www.pdfquestion.in/3211.html 

2. Define Reynolds No? :
It’s defined as the ratio of an inertia force of the flowing fluid and the viscous force of the fluid

3. Define Euler’s No? :
It’s defined as the square root of the ratio of the inertia force of a flowing fluid
to the pressure force

4. Define Weber’s No? :
It’s defined as the square root of the ratio of the inertia force of a flowing fluid
to surface tension force

5. Define Froude’s No? :
It’s defined as the square root of the ratio of the inertia force of a flowing fluid
to the gravity force

6. Define Buckinghams ? : Theorem?:
If there are n variables in a physical phenomenon and if this variables contain m fundamental dimension (M, L, T) then the variables are arranged to (n-m) dimensionless terms, each term is called ? :-term

7. What Is Meant By Similarities? :
Model and prototype have similar properties or model and prototype are similar

8. Write Down The Types Of Similarities? :
** Geometric similarity
** Kinematic similarity
** Dynamic similarity

UNIT – 2

1. What Are The Classifications Of Wind Tunnel? :
** Low speed wind tunnel,
** High speed wind tunnel,
** Special type tunnel.

2. What Is Function Of Effuser? :
It converts available pressure energy into kinetic energy and its located upstream of the test section.

3. What Is Function Of Diffuser? :
It converts the kinetic energy to pressure energy and it’s downstream of the test section.

4. What Is Breather? :
It is attached with an one way valve so that it take the air and by propeller suction, flow is maintained inside the return type.

5. What Are The Merits And Demerits Of Open Circuit? :
** Construction cost less,
** It no surging problem is open to the free atm.

Demerits :
** Tunnels much noisy,
** Make cost environment problem.

6. Define Energy Ratio :
It is defined as the ratio between the total kinetic energy of the flow to the energy loss. ER = 1/K0

7. What Are The Advantages Of Blow Down Type Wind Tunnel? :
** This is the simplest among the supersonic tunnel and most economic to build.
** Constant blowing press can be maintaining for considerable running by throttle valve.

8. What Are The Application Of Vertical Wind Tunnel? :
** It is used to study the spinning motion of the aircraft,
** Ejection of pilots from seats,
** Parachute flying,
** Helicopter operation.

9. What Are The Losses In Supersonic Tunnel? :
** Friction losses,
** Expansion losses,
** Losses in the contraction cone and test section,
** Losses in guide vanes,
** Losses in cooling system.

UNIT – 3

1. WHAT ARE THE TYPES OF FLOW ANGULARITIES?
Sphere type yaw meter,
Claw type yaw meter.

2. WHAT ARE THE TURBULENT MEASUREMENTS?
Turbulence sphere,
Pressure sphere,
Hot wire anemometer.

3. WHAT ARE THE METHODS TO REDUCE TURBULENCE INSIDE W/T.
Using max. no of fan blades,
Using a very long and gradual nacelle,
Anti swirl vanes,
Providing max. Possible distance between propellers and test section.

4. PRINCIPLE OF HOT WIRE ANEMOMETER.
The rate of heat from an electrical heated wire and placed in an airstream is proportional to the velocity.

UNIT – 4

1. DEFINE WIND TUNNEL BALANCE?
Wind tunnel balance is a device to measure the actual forces &moments acting on a model placed in the test section stream

2. WHAT ARE THE CLASSIFICATIONS OF WIND TUNNEL BALANCE?
Wire type balance
Strut type balance
Platform type balance
Yoke type balance
Strain gauge type balance

3. WHAT DO YOU MEAN BY WIRE BALANCE?
In wire type wind tunnel balances only wires are used to support the model. All the load components are transmitted to the measuring device by these wires.

4. WHAT ARE THE CLASSIFICATIONS OF STRUT TYPE BALANCES?
Yoke type
Platform type
Pyramid type

5. WHAT ARE THE TYPES OF STRAIN GAUGE BALANCE?
Internal balance
Semi internal balance
External balance

6. WHAT IS THE PRINCIPLE OF LIQUID MANOMETER?
The principle is that the pressure is balanced by the weight of a liquid column.

7. WHAT ARE THE TYPES OF BAROMETERS?
Syphon barometer
Fortin barometer
Aneroid barometer

8. GIVE SOME DISADVANTAGES OF DIAL TYPE PRESSURE GAUGE?
They must be calibrated periodically to ensure that they continue to read correctly
The manometers are less expensive when there is a large number of pressures to be read
Like manometers, they cannot be easily read electronically

9. WHAT ARE THE TYPES OF PRESSURE TRANSDUCERS?
They are classified as mechanical, electrical & optical type

10. LIST OUT SOME ADVANTAGES OF PRESSURE TRANSDUCERS?
They provide signal proportional to the applied pressure which can be automatically recorded by acquisition system
They are relatively low volume devices & consequently respond more rapidly to pressure changes