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Code No: 05412101 Set No. 1JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

IV B.Tech I-Sem I Mid-Term Examinations, Aug/Sept. 2009THEORY OF VIBRATIONS AND AEROELASTICITY

Objective ExamName: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.A

I. Choose the correct alternative:

1. In free vibrations, the acceleration vector leads the displacement vector by [ ]

a) b) /2 c) /3 d) 2/3

2. If the system vibrates normal to its axis the vibrations are [ ]

a) Longitudinal b) Torsional c) Transverse d) None

3. The vibration of beams is [ ]

a) Longitudinal b) Torsional c) Transverse d) None

4. The number of DOF of a beam vibration is [ ]

a) Single DOF b) Finite DOF c) Infinite DOF d) None

5. The Equivalent Stiffness of axial bar of length L , cross-sectional area A and Youngs

modulus E is [ ]

a) AL/E b) AE/L c) EL/A d) None6. If two springs are connected in parallel, the resultant stiffness will [ ]

a)Increase b) Decrease c) be Unaltered d) None

7. If two springs of equal stiffness are connected in series then the equivalent stiffness

[ ]

a) Is Same b) Doubles c) Becomes half d)None

8. For a spring of mass m, the equivalent mass at the end of the spring when vibrating is

[ ]

a) m/2 b) m/3 c) m/4 d) m

9. If the stiffness of the system is increased to 4 times of original value, then the frequency

becomes [ ]

a) Half b) Double c) 4times d) Unaltered

10. In a Vibration, kinetic energy at mean position is equal to the potential energy at extreme

position. This method is called [ ]

a) Newtons method b) Lagranges method c) Rayleighs method d) None

Contd2

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Code No: 05412101 : 2 : Set No. 1

II. Fill in the blanks:

11. A reduction in amplitude of successive oscillations without external disturbance indicates

____________________

12. The equivalent stiffness of cantilever beam is ________________

13. The unit of stiffness is ________________

14. The natural frequency of spring mass system is _______________

15. The maximum displacement of a vibrating system is called ____________

16. The vibration of a system under external force is called _________________ vibration

17. The elastic coupling is also known as __________________coupling

18. Damping coupling is also known as ____________________ Coupling

19. The natural frequency of a beam subjected to several point loads is given by an empirical

formula obtained by _________ method.

20. The lowest frequency of Multiple DOF is called ________________

-oOo-

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Code No: 05412101 Set No. 2JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

IV B.Tech I-Sem I Mid-Term Examinations, Aug/Sept. 2009THEORY OF VIBRATIONS AND AEROELASTICITY

Objective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.A

I. Choose the correct alternative:

1. The number of DOF of a beam vibration is [ ]

a) Single DOF b) Finite DOF c) Infinite DOF d) None

2. The Equivalent Stiffness of axial bar of length L , cross-sectional area A and Youngs

modulus E is [ ]

a) AL/E b) AE/L c) EL/A d) None

3. If two springs are connected in parallel, the resultant stiffness will [ ]

a)Increase b) Decrease c) be Unaltered d) None

4. If two springs of equal stiffness are connected in series then the equivalent stiffness

[ ]

a) Is Same b) Doubles c) Becomes half d)None

5. For a spring of mass m, the equivalent mass at the end of the spring when vibrating is

[ ]a) m/2 b) m/3 c) m/4 d) m

6. If the stiffness of the system is increased to 4 times of original value, then the frequency

becomes [ ]

a) Half b) Double c) 4times d) Unaltered

7. In a Vibration, kinetic energy at mean position is equal to the potential energy at extreme

position. This method is called [ ]

a) Newtons method b) Lagranges method c) Rayleighs method d) None8. In free vibrations, the acceleration vector leads the displacement vector by [ ] a) b) /2 c) /3 d) 2/3

9. If the system vibrates normal to its axis the vibrations are [ ]

a) Longitudinal b) Torsional c) Transverse d) None

10. The vibration of beams is [ ]

a) Longitudinal b) Torsional c) Transverse d) None

Contd.2

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Code No: 05412101 :2: Set No. 2

II. Fill in the blanks:

11. The natural frequency of spring mass system is _______________

12. The maximum displacement of a vibrating system is called ____________

13. The vibration of a system under external force is called _________________ vibration

14. The elastic coupling is also known as __________________coupling

15. Damping coupling is also known as ____________________ Coupling

16. The natural frequency of a beam subjected to several point loads is given by an empirical

formula obtained by _________ method.

17. The lowest frequency of Multiple DOF is called ________________

18. A reduction in amplitude of successive oscillations without external disturbance indicates

____________________

19. The equivalent stiffness of cantilever beam is ________________

20. The unit of stiffness is ________________

-oOo-

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Code No: 05412101 Set No. 3JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

IV B.Tech I-Sem I Mid-Term Examinations, Aug/Sept. 2009THEORY OF VIBRATIONS AND AEROELASTICITY

Objective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.A

I Choose the correct alternative:

1. If two springs are connected in parallel, the resultant stiffness will [ ]

a)Increase b) Decrease c) be Unaltered d) None

2. If two springs of equal stiffness are connected in series then the equivalent stiffness

[ ]

a) Is Same b) Doubles c) Becomes half d)None

3. For a spring of mass m, the equivalent mass at the end of the spring when vibrating is

[ ]

a) m/2 b) m/3 c) m/4 d) m

4. If the stiffness of the system is increased to 4 times of original value, then the frequency

becomes [ ]

a) Half b) Double c) 4times d) Unaltered

5. In a Vibration, kinetic energy at mean position is equal to the potential energy at extreme

position. This method is called [ ]a) Newtons method b) Lagranges method c) Rayleighs method d) None

6. In free vibrations, the acceleration vector leads the displacement vector by [ ]

a) b) /2 c) /3 d) 2/3

7. If the system vibrates normal to its axis the vibrations are [ ]

a) Longitudinal b) Torsional c) Transverse d) None

8. The vibration of beams is [ ]

a) Longitudinal b) Torsional c) Transverse d) None

9. The number of DOF of a beam vibration is [ ]

a) Single DOF b) Finite DOF c) Infinite DOF d) None

10. The Equivalent Stiffness of axial bar of length L , cross-sectional area A and Youngs

modulus E is [ ]

a) AL/E b) AE/L c) EL/A d) NoneContd2

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Code No: 05412101 :2: Set No. 3

II. Fill in the blanks:

11. The vibration of a system under external force is called _________________ vibration

12. The elastic coupling is also known as __________________coupling

13. Damping coupling is also known as ____________________ Coupling

14. The natural frequency of a beam subjected to several point loads is given by an empirical

formula obtained by _________ method.

15. The lowest frequency of Multiple DOF is called ________________

16. A reduction in amplitude of successive oscillations without external disturbance indicates____________________

17. The equivalent stiffness of cantilever beam is ________________

18. The unit of stiffness is ________________

19. The natural frequency of spring mass system is _______________

20. The maximum displacement of a vibrating system is called ____________

-oOo-

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Code No: 05412101 Set No. 4JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

IV B.Tech I-Sem I Mid-Term Examinations, Aug/Sept. 2009THEORY OF VIBRATIONS AND AEROELASTICITY

Objective Exam

Name: ______________________________ Hall Ticket No.

Answer All Questions. All Questions Carry Equal Marks.Time: 20 Min. Marks: 20.A

I. Choose the correct alternative:

1. For a spring of mass m, the equivalent mass at the end of the spring when vibrating is

[ ]

a) m/2 b) m/3 c) m/4 d) m

2. If the stiffness of the system is increased to 4 times of original value, then the frequency

becomes [ ]a) Half b) Double c) 4times d) Unaltered

3. In a Vibration, kinetic energy at mean position is equal to the potential energy at extreme

position. This method is called [ ]

a) Newtons method b) Lagranges method c) Rayleighs method d) None4. In free vibrations, the acceleration vector leads the displacement vector by [ ]

a) b) /2 c) /3 d) 2/3

5. If the system vibrates normal to its axis the vibrations are [ ]

a) Longitudinal b) Torsional c) Transverse d) None

6. The vibration of beams is [ ]

a) Longitudinal b) Torsional c) Transverse d) None

7. The number of DOF of a beam vibration is [ ]

a) Single DOF b) Finite DOF c) Infinite DOF d) None

8. The Equivalent Stiffness of axial bar of length L , cross-sectional area A and Youngs

modulus E is [ ]

a) AL/E b) AE/L c) EL/A d) None9. If two springs are connected in parallel, the resultant stiffness will [ ]

a) Increase b) Decrease c) be Unaltered d) None

10. If two springs of equal stiffness are connected in series then the equivalent stiffness

[ ]

a) Is Same b) Doubles c) Becomes half d)None

Contd...2

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Code No: 05412101 :2: Set No. 4

II. Fill in the blanks:

11. Damping coupling is also known as ____________________ Coupling

12. The natural frequency of a beam subjected to several point loads is given by an empirical

formula obtained by _________ method.

13. The lowest frequency of Multiple DOF is called ________________

14. A reduction in amplitude of successive oscillations without external disturbance indicates

____________________

15. The equivalent stiffness of cantilever beam is ________________

16. The unit of stiffness is ________________

17. The natural frequency of spring mass system is _______________

18. The maximum displacement of a vibrating system is called ____________

19. The vibration of a system under external force is called _________________ vibration

20. The elastic coupling is also known as __________________coupling

-o0o-