Theory of Vibrations MCQ
What does jerk specify?
Answer
Correct Answer:
Time rate of change of acceleration
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What does an Integrator do?
Answer
Correct Answer:
Convert a vibratory acceleration signal to one whose amplitude is proportional to velocity or displacement
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What is an example of an electrical frequency filter?
Answer
Correct Answer:
Integrator
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Periodic impulse is repeated what?
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What is a characteristic of a periodic impulse?
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What is a term for well defined pulse?
Answer
Correct Answer:
Periodic impulse
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What is a force pulse used to excite structures?
Answer
Correct Answer:
E.g. using an Impact Hammer
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What is the most common use of an impact hammer?
Answer
Correct Answer:
Excitation of a structure
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What agency accelerates mass?
Answer
Correct Answer:
Retardation Agency
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What agency gives the mass an acceleration?
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What does the application of an external force to a system cause the system to do?
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Correct Answer:
Respond in same way
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An external force or motion applied to a system that causes the system to respond in same way is called what?
Answer
Correct Answer:
Excitation
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What is a type of modulus?
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What is a ratio that measures the stress in a material to the strain?
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What is the ratio of stress to strain under vibratory conditions?
Answer
Correct Answer:
Dynamic modulus
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What type of motion does the ratio of force to resulting acceleration describe?
Answer
Correct Answer:
Simple harmonic motion
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What is the result of applying a constant force to an object during simple harmonic motion?
Answer
Correct Answer:
Resulting acceleration
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A system that has a degree of freedom has how many co-ordinates?
Answer
Correct Answer:
Independent
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What is the minimum number of independent co-ordinates required to completely define the position of all parts of the system at any instant of time?
Answer
Correct Answer:
Degree of freedom
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What is the ratio between actual and critical damping?
Answer
Correct Answer:
Damping ratio
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What is the function of damping?
Answer
Correct Answer:
Any means of dissipating vibration energy
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What is done to vibration energy in a vibrating system?
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What is a vector quantity that specifies the change of position of a body?
Answer
Correct Answer:
Displacement
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What minimum amount of damping must the system have in order to return to its original position without oscillation?
Answer
Correct Answer:
The minimum viscous damping
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What term refers to the minimum amount of viscous damping required to maintain a system's original position?
Answer
Correct Answer:
Critical damping
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What is the reciprocal of stiffness?
Answer
Correct Answer:
Compliance
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The reciprocal of compliance is what?
Answer
Correct Answer:
Stiffness
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What is the advantage of a charge amp over a constant voltage amplifier?
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Correct Answer:
Voltage output is not affected by length of connecting cable from the transducer
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What type of transducer uses charge to produce voltage?
Answer
Correct Answer:
Piezoelectric
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What type of sensor is an accelerometer?
Answer
Correct Answer:
Electrical
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Each output from an accelerometer is proportional to what?
Answer
Correct Answer:
Acceleration
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What kind of change of velocity is specified by the term acceleration?
Answer
Correct Answer:
Rate of change
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What is a vector quantity that specifies rate of change of velocity?
Answer
Correct Answer:
Acceleration
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What is a system that includes mass, stiffness, and damping?
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Correct Answer:
Mechanical System
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What are the three components of a mechanical system?
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Correct Answer:
Mass, stiffness, and damping
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What does excessively large mean?
Answer
Correct Answer:
Resonance
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What does damping resist?
Answer
Correct Answer:
The motion of a vibrating body
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What is resistance to the motion of a vibrating body?
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What is the motion of the body to and fro about a fixed point?
Answer
Correct Answer:
Simple harmonic motion
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What type of motion is called simple harmonic motion?
Answer
Correct Answer:
The motion of the body to and fro about a fixed point
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What is the minimum number of independent coordinates required to specify the motion of a system at any instant?
Answer
Correct Answer:
Degree of Freedom
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When is the degree of freedom the minimum needed to specify the motion of a system?
Answer
Correct Answer:
Any instant
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What is the lowest natural frequency?
Answer
Correct Answer:
The fundamental mode of vibration
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The fundamental mode of vibration is the model having the lowest what?
Answer
Correct Answer:
Natural frequency
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What is the term for frequency that is not affected by outside forces?
Answer
Correct Answer:
Natural frequency
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When a system vibrates after being displaced, it is said to vibrate in what fashion?
Answer
Correct Answer:
Free vibration
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What is the maximum displacement of the vibrating body from its equilibrium position?
Answer
Correct Answer:
Amplitude
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What is another term for frequency?
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How many cycles describe in one second?
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What does a cycle usually last?
Answer
Correct Answer:
One time period
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What term is used to describe motion completed during one time period?
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Time is defined as how long one cycle is?
Answer
Correct Answer:
A Time period
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What is another name for a cycle?
Answer
Correct Answer:
Time period
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What kind of motion repeats itself after an equal interval of times?
Answer
Correct Answer:
Periodic Motion
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What does the motion repeat itself after?
Answer
Correct Answer:
Equal interval of times
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What is motion around an equilibrium point?
Answer
Correct Answer:
Mechanical motion
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What is the rate of change in position measured in?
Answer
Correct Answer:
Distance per unit of time
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What does it mean for the mass centerline not to coincide with the rotation or geometric centerline?
Answer
Correct Answer:
Unbalance
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What is unbalance?
Answer
Correct Answer:
Unequal mass distribution on a rotor
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What axis is perpendicular to the mounting of the accelerometer?
Answer
Correct Answer:
Second horizontal axis
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What is the third vibration axis?
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For typical horizontal machines, what equals the horizontal axis?
Answer
Correct Answer:
Tangential
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What is the name of the third vibration axis?
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For typical horizontal machines, the tangential equals the what?
Answer
Correct Answer:
Horizontal axis
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What type of sensor has no moving parts?
Answer
Correct Answer:
Solid-state sensor
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What type of sensor does the Apple Watch use?
Answer
Correct Answer:
Solid-state
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Sensitivity is an example of what?
Answer
Correct Answer:
Electrical signal
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What is the ratio between electrical signal and mechanical quantity?
Answer
Correct Answer:
Sensitivity
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What is the name of the unit of measurement that describes the speed of a rotating machine?
Answer
Correct Answer:
Revolutions per minute
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What is the scientific method called?
Answer
Correct Answer:
Cause analysis
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What is the term for determining what actually caused a failure?
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Correct Answer:
Root cause analysis
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What does "resolution" mean?
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Correct Answer:
The smallest input change that produces a detectable change in an instrument's output
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What is the smallest input change that produces a detectable change in an instrument's output?
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Correct Answer:
Resolution
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What does the term replication mean?
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Correct Answer:
Testing that reproduces a specified desired history
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What does testing that reproduces a specified desired history mean?
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Correct Answer:
Replication
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What aspect of data points taken under identical conditions is referred to as repetition?
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Correct Answer:
The maximum deviation from the mean
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What does "maximum deviation from the mean" mean?
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Correct Answer:
Repeatability
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What is the direction from the transducer to the center of the shaft on rotating equipment?
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Pitch is the rotation in the plane of forward motion, about what axis?
Answer
Correct Answer:
Left-right
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Pitch is a rotation in the plane of what?
Answer
Correct Answer:
Forward motion
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What is associated with orders in the rotating machines?
Answer
Correct Answer:
Running speed
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What are multiples or harmonics of the running speed?
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What is an example of an associated reference component?
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What is the measure for non-repairable items?
Answer
Correct Answer:
Mean-Time-To-Failure
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What is the measurement of reliability for repairable items?
Answer
Correct Answer:
Mean-Time-Between-Failure
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What is the acronym for Mean-Time-Between-Failure?
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MTBF is a measurement of reliability for what?
Answer
Correct Answer:
Repairable items
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What can reduce motion severity?
Answer
Correct Answer:
Isolation
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Imbalance can cause what?
Answer
Correct Answer:
Undue machine vibration
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What condition can reduce bearing life on rotating equipment?
Answer
Correct Answer:
Imbalance
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What is the property of frequency?
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What is the symbol for Hertz?
Answer
Correct Answer:
The unit of frequency
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What is the abbreviation for Hertz?
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What kind of distortion can occur in an output signal?
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Distortion caused by the presence of frequencies not present in the input signal is known as what?
Answer
Correct Answer:
Harmonic Distortion
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What could an harmonic quantity be?
Answer
Correct Answer:
A sinusoidal quantity
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What is a harmonic quantity?
Answer
Correct Answer:
Sinusoidal
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What is the time domain representation of vibration?
Answer
Correct Answer:
A vibration signal is represented as a time wave form
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What is the number of events that occur within a fixed time period?
Answer
Correct Answer:
Frequency
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What type of frequency is expressed in cpm?
Answer
Correct Answer:
Cycles per minute
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What is the vibration of a machine caused by?
Answer
Correct Answer:
Some mechanical excitation
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What is the term for vibration of a machine caused by some mechanical excitation?
Answer
Correct Answer:
Forced vibration
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What kind of parts result in failure?
Answer
Correct Answer:
The mechanical or physical parts
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Failure is not a specification of what?
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Correct Answer:
Item or part of an item
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What is the failure state for an item or part of an item?
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Correct Answer:
Inoperable
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What does "mils" stand for?
Answer
Correct Answer:
Thousandths of an inch
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What does the measurement, recording and analysis of machinery parameters do?
Answer
Correct Answer:
Determine equipment health
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What does balancing a rotating element reduce?
Answer
Correct Answer:
Vibratory forces
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Along with radial and tangential, what type of vibration axis is the axial?
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What is the term for a vibration axis that is parallel to the centerline of a shaft or turning axis of a rotating part?
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What is the term for the adhesive used to mount the attachment pad to the machine?
Answer
Correct Answer:
Industrial
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What is the condition where components within a drivetrain are parallel or perpendicular according to design requirements?
Answer
Correct Answer:
Alignment
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What is the most used transducer for vibration measurements?
Answer
Correct Answer:
Accelerometer
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What do accelerometers typically cover?
Answer
Correct Answer:
A much wider frequency range
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What is the rate of change of velocity often depicted as?
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What term is used to describe the rate of change of velocity in the metric system?
Answer
Correct Answer:
Acceleration
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