Quizlet
Bifilar Suspension System
1. What is the principle of a bifilar suspension system?
- To calculate torque and rotational speed
- To measure air resistance on rotating objects
- To calculate the moment of inertia and the acceleration due to gravity (g)
- To determine angular displacement
2. How is the bifilar suspension system used in aviation?
- To enhance fuel efficiency
- To monitor cabin pressure and air flow
- To reduce vibration and measure the aircraft’s mass moment of inertia
- To calculate wind resistance at high altitudes
3. Why is it called a 'bifilar' suspension system?
- Because it uses two parallel threads or wires for support
- Because it uses two springs to hold the mass
- Because it consists of a bilateral force system
- Because it involves bi-directional oscillation
4. Which of the following is a correct application of a bifilar suspension system?
- Calculating moment of inertia in drones and suspension bridges
- Detecting electrical conductivity
- Stabilizing magnetic fields
- Controlling altitude in spacecraft
5. What is torsion?
- The motion of an object along a circular path
- The action of twisting one end of an object while the other end is fixed
- The motion of an object in free fall
- The vibration of particles in a transverse wave
6. What are torsional oscillations?
- Oscillations of objects suspended by a spring
- Back-and-forth rotations around an axis due to restoring torque after twisting
- Oscillations involving linear displacement along an axis
- Oscillations caused by a force acting vertically
7. What is the working principle of a torsional pendulum?
- Linear momentum conservation
- Gravitational pull and mass displacement
- Restoring torque and rotational inertia causing angular SHM
- Air resistance and pendulum length
8. In a torsional pendulum, what provides the restoring force for the oscillation?
- Gravity
- Elastic string tension
- Magnetic repulsion
- Twisting of the wire or string
9. What is the moment of inertia?
- The property by which a body resists changes in its rotational motion about an axis
- The distance from the center of mass to the pivot point
- The force required to stop a rotating object
- The speed of rotation of an object
10. Which of the following expressions correctly defines the moment of inertia?
- I = F × r
- I = mv²
- I = mr
- I = ∑miri²
11. What is the radius of gyration?
- The distance from the axis where all mass can be concentrated to produce the same moment of inertia
- The radius of a disc spinning at maximum velocity
- The radius of a circle with the same area as the object
- The maximum radius of the object
12. Which of the following best defines the Theorem of Parallel Axes?
- I = Icm + Ma², where Icm is moment of inertia about center of mass axis
- The moment of inertia of any axis is the difference between two perpendicular axes
- I = Icm − Ma²
- I = M × r × v
13. What does the Theorem of Perpendicular Axes state?
- Iz = Ix + Iy for a 3D body
- Iz = Ix + Iy for a planar body
- Iz = Ix − Iy for a solid sphere
- Ix = Iy = 0 for symmetric objects
14. What is the purpose of a plumb line?
- To determine vertical alignment using gravity
- To measure horizontal displacement
- To mark reference points for electrical wiring
- To suspend rotating machinery
15. Why does a plumb bob point directly toward the Earth's center of gravity?
- Due to gravitational pull acting vertically downward
- Because of wind resistance acting on the weight
- Because it is magnetized
- Because it is aligned with magnetic north