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WorksheetsMechanics of Machines - Undamped Vibration
Total questions: 17
Worksheet time: 9mins
What is not major component in vibration system?
damper
spring
mass
support
What is the different between free and forced vibrations?
only free vibration oscillates in natural frequency.
forced vibration frequency is natural frequency.
forced vibration is caused by external oscillating source.
free vibration has no external source of motion.
Which one is wrong
spring only produce force when there is displacement in it.
dashpot only produce force when there is velocity in it.
mass only produce force when there is acceleration in it.
spring also produce force when there is velocity in it.
Which of the following daily activity does not involve vibration
noise from highway
cooking dishes in pan
yoga exercise
empty glass on a table
Which of the following is example of free vibration
released ball bounces on floor
clock pendulum
windmill
idle car engine
Which of the following is example of forced vibration
bungee jumping of a mannequin
hydroelectric generator turbine
punching bag hit once
water ripple from falling stone
How to increase natural frequency of a system?
Increase the mass
Make the spring longer
Increase the strength of spring
Decrease spring stiffness
If the block is displaced to the right, what the free-body-diagram would be?
If the block is displaced to the right, what the kinetic diagram would be?
If the block is displaced to the right, what the free-body-diagram would be?
If the block is displaced to the right, what the kinetic diagram would be?
The solution for free vibration differential equation (left) is shown in diagram (right). Which of the following is correct?
amplitude = A2+B2
amplitude = (A+B)1/2
phase angle = tan-1(B/A)
phase angle = sin-1(B/A)
If the disc is displaced anti-clockwise (Ɵ), what the free-body-diagram would be?
anti-clockwise resultant torque
clockwise resultant torque
anti-clockwise restoring moment
clockwise restoring moment
If the disc is displaced anti-clockwise (Ɵ), what the kinetic diagram would be?
anti-clockwise resultant torque
clockwise resultant torque
anti-clockwise restoring moment
clockwise restoring moment
Which of the following component/s in forced vibration solution describe the free vibration behaviour?
1
1 & 2
2 & 3
3
Which of the following component/s in forced vibration solution describe the steady-state vibration behaviour?
1
1 & 2
2 & 3
3
The disc move anti-clockwise (Ɵ) due to the displacement of block, x. Which one is the kinetic diagram?
