Noise & Vibration Control MCQs
Noise & Vibration Control MCQs
Answer these Noise & Vibration Control MCQs and assess your grip on the subject of Noise & Vibration Control.
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1: How do 6DOF machines produce vibration?
A. Repetitive shock
B. They use air-driven impact hammers to excite a vibrating plate or table
C. They use a vibrating plate or table to excite air-driven impact hammers
D. They use air-driven impact hammers to excite another 6DOF machine
2: What does the term "absolute" refer to in calibration?
A. A type of rock music
B. The furthest extent
C. A figure of speech
D. Calibration based on the primary standards of mass, length, and time
3: What is an absorber?
A. A device that produces heat
B. A device that produces light
C. A device capable of reducing or attenuating vibration
D. A device that amplifies sound
4: How does an absorber work?
A. By amplifying vibration
B. By cancelling out vibration
C. By reflecting vibration
D. By converting vibration to heat
5: What is the rate of change of velocity with time called?
A. Time
B. Force
C. Velocity
D. Acceleration
6: What is acceleration?
A. The rate of change of velocity with distance
B. The rate of change of time with space
C. The rate of change of velocity with time
D. The rate of change of distance with space
7: What is the relationship between accuracy and inaccuracy?
A. Accuracy is related to inaccuracy.
B. Accuracy is the same as inaccuracy.
C. Accuracy is the inverse of inaccuracy.
D. Accuracy is not related to inaccuracy.
8: What is the desired machinery condition when the axes of a machine's components are adjusted to be colinear, parallel or perpendicular?
A. Camber
B. Toe
C. Alignment
D. Scrub
9: Which of the following is NOT a desired machinery condition of alignment?
A. Parallel
B. Perpendicular
C. Least vibration
D. Colinear
10: What is the torsional vibration frequency in radians per second?
A. Seconds
B. Frequency
C. Radian
D. Angular frequency
11: What is the frequency in Hz of a 10 rad/s angular frequency?
A. 80 Hz
B. 16 Hz
C. 160 Hz
D. 8 Hz
12: What does ASD stand for?
A. Amplitude Spectral Deviation
B. Acceleration Standard Deviation
C. Acceleration Square Deviation
D. Spectral Density
13: What is the square root of the area under the ASD curve defined as?
A. The measure of acceleration power per Hz of analysis bandwidth
B. Power Spectral Density
C. The sum of the areas under the ASD curve
D. G RMS of acceleration
14: What does auto-ranging refer to?
A. The capability of an instrument to switch ranges automatically.
B. The capability of an instrument to calibrate itself automatically.
C. The capability of an instrument to take readings in multiple units.
D. The use of multiple instruments to take readings simultaneously.
15: Auto-ranging is the capability of an instrument to switch ranges automatically. True or False?
A. True
B. False
16: What is the average responding proportional to?
A. The average of the absolute values of all input waveforms outside a specified frequency range
B. The average of the absolute values of all input waveforms
C. The average of the absolute values of all input waveforms within a specified frequency range
D. The average of all input waveforms
17: What is another name for average responding?
A. Mode responding
B. Median responding
C. Geometric mean responding
D. Mean responding
18: What is the axial position?
A. The change in a rotor's position or displacement along its axis and relative to a fixed point nearby.
B. The change in a rotor's position or displacement along its axis and relative to a moving point far away.
C. The change in a rotor's position or displacement along its axis and relative to a moving point nearby.
D. The change in a rotor's position or displacement along its axis and relative to a fixed point far away.
19: What is the goal of equalization?
A. To amplify the sound
B. To make the sound clearer
C. To get rid of background noise
D. To compensate for the non-flat frequency response of human hearing
20: What is the meaning of traceable to NJST?
A. There is no such thing as NJST
B. NJST is an acronym for National Joseph Stalin tracing
C. A measure of the uncertainty of an instrument reading compared to that of a primary standard
D. The primary standard is located in NJST
21: What is the purpose of accelerated life testing?
A. To identify failure-prone, marginally strong elements by causing them to fail.
B. To test the product at levels much higher than those anticipated in the field.
C. To find the weakest point in the product.
D. To stress test the product.
22: What are the two common types of accelerometers?
A. Pneumatic and Hydraulic
B. Piezoresistive and Piezoelectric
C. Capacitive and Inductive
D. Thermocouple and RTD
23: What is an accelerometer?
A. A device that measures distance
B. A device that measures acceleration
C. A sensor, transducer, or pickup that converts acceleration into an electrical signal.
D. A device that measures speed
24: What is the purpose of an aggravated test?
A. To make the test item more stressed
B. To provide a margin of safety
C. To increase test time
D. To reduce test time or assure a margin of safety.
25: What is the ambient environment?
A. The conditions that characterize the material
B. The material itself
C. The process of surrounding the material.
D. The conditions that characterize the air or other medium that surrounds the material.
26: What does an angular rate sensor measure?
A. Rotational velocity (degrees or radians per second) around its sensitive axis.
B. Distance
C. Mass
D. Time
27: What is the degree to which an item is in an operable and committable state at the start of a mission called?
A. Availability
B. Suitability
C. Mutability
D. Reliability
28: What is the process of summing and dividing several like measurements to improve accuracy or lessen the effect of any asynchronous components called?
A. Addition
B. Division
C. Averaging
D. Multiplication
29: What is an analog signal?
A. A signal that remains constant in voltage or current
B. A signal that changes in voltage or current
C. A device that changes a digital signal into an analog signal
D. A digital signal
30: What changes an analog signal into a digital signal?
A. A speakers
B. An amplifier
C. A voltage regulator
D. A digital converter
31: What is absolute vibration?
A. Vibration of an object that is not periodic.
B. Vibration of an object relative to a fixed point in space.
C. Vibration of an object relative to another object.
D. Vibration of an object that is not fixed in space.
32: Seismic sensors measure _____ vibration.
A. Relative
B. Absolute
C. Mixed
D. Vibrant
33: What is the main purpose of accelerated stress testing?
A. To precipitation hidden or latent failures.
B. To assess the quality of a product.
C. To find out the average lifespan of a product.
D. To prevent units from reaching the next level of assembly.
34: What is accelerated stress testing?
A. A process on a sample of units to find hidden or latent failures after production.
B. A post-production process on a sample of units to precipitate hidden or latent failures.
C. A post-production process on a sample of units to find hidden or latent failures.
D. A process on a sample of units to find hidden or latent failures before production.
35: Accessibility is the related ease of what to various portions of an item?
A. Maintenance
B. Ease of access
C. Access
D. Operation
36: What is accessibility?
A. Accessibility measures the related ease of access to various portions of an item for operation or maintenance.
B. The ability to walk and talk
C. The ability to read and write
D. The ability to see and hear
37: What is aliasing?
A. A condition that causes low-frequency signals to appear in a spectrum at high frequencies.
B. A spectrum analysis problem that results from sampling data at too high a sampling frequency.
C. A spectrum analysis problem that results from sampling data at too low a sampling frequency.
D. The process of converting a signal from one form to another.
38: What causes aliasing in a spectrum?
A. Not following the Nyquist theorem
B. Sampling data at too high a frequency
C. Sampling data at too low a sampling frequency
D. Using an analog input
39: What is amplitude?
A. The magnitude of a quantity
B. The sum of a quantity and its zero value
C. The zero value of a quantity
D. The magnitude of a quantity's variation from its zero value
40: What does Amplitude refer to?
A. Time
B. Displacement, velocity, acceleration, voltage, current, force, or pressure.
C. Temperature
D. Mass
41: What is an anti-aliasing filter?
A. A low-pass filter designed to stop frequencies higher than some fraction of the sample rate to minimize aliasing.
B. Notch filter
C. A band-pass filter design
D. A high-pass filter design
42: What does an anti-aliasing filter do?
A. It boosts frequencies higher than some fraction of the sample rate to maximize aliasing.
B. It does nothing to stop aliasing.
C. It stops frequencies higher than some fraction of the sample rate to minimize aliasing.
D. It randomly changes frequencies to create aliasing.
43: What does a power spectral density plot show?
A. The average power at each frequency
B. A spectral display of the power (voltage squared) at each frequency.
C. The power at each frequency over time
D. The power at each frequency over voltage
44: What is the average value of a pure sine wave?
A. Two
B. One
C. Zero
D. Three
45: What is the meaning of "Axial?"
A. A type of plane
B. Perpendicular to the longitudinal axis of a member
C. The force exerted by one object on another
D. The direction along the centerline of a shaft.
46: What is balancing?
A. The process of adjusting the distribution of mass in a rotating element to increase vibratory forces generated by rotation.
B. The process of adjusting the distribution of mass in a non-rotating element to increase vibratory forces generated by rotation.
C. The process of adjusting the distribution of mass in a non-rotating element to reduce vibratory forces generated by rotation.
D. The process of adjusting the distribution of mass in a rotating element to reduce vibratory forces generated by rotation.
47: What is the term for the process of adjusting the distribution of mass in a rotating element to reduce vibratory forces generated by rotation?
A. Weighting
B. Spinning
C. Balancing
D. Off-balancing
48: What is a baseline spectrum?
A. A vibration spectrum that is recorded when a machine is turned off.
B. A vibration spectrum that is recorded when a machine is in bad working condition.
C. A vibration spectrum that is recorded when a machine is turned on.
D. A vibration spectrum that is recorded when a machine is in good working condition.
49: What is a bode plot?
A. A graph of position and speed plotted against time.
B. A graph of magnitude and phase plotted against time.
C. A graph of magnitude and phase plotted against speed.
D. A graph of acceleration and speed plotted against time.
50: What does a bode plot display?
A. Magnitude of vibration at 1x the shaft speed and its amplitude relative to the shaft position
B. Phase of vibration at 1x the shaft speed and its frequency relative to the shaft position
C. Frequency of vibration at 1x the shaft speed and its amplitude relative to the shaft position
D. Magnitude of vibration at 1x the shaft speed and its phase relative to the shaft position
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