The CDC 4B051 Practice Test assesses knowledge in ventilation systems, focusing on mechanics like static and velocity pressures, duct sizing, and air quality control. It is crucial for professionals ensuring safe and efficient environmental conditions.
Face velocity
Duct velocity
Capture velocity
Transport velocity
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Just before or after a weekend
During a workplace inspection
If the workload is temporarily increased
When workdays are representative of normal shifts
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25%
20%
15%
10%
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Tinnitus
Acoustic Trauma
Threshold shift
Auditory Fatigue
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Monthly
Annually
Quarterly
Bi-annually
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A high altitude
Standard conditions
Elevated temperature
High barometric pressure
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Positive static
Negative static
Positive velocity
Negative velocity
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Always positive
Always negative
Negative on the blowing side
Negative on the exhausting side
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Vapor pressure
Explosive limit
Saturation concentration
Required air flow volumes
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Hood size
Duct length
Duct velocity
Duct diameter
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Area and pressure
Area and velocity
Velocity and pressure
Diameter and velocity
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Less noise
Lower operating costs
Better protection for equipment
Easier worker access to the process
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Adequate makeup air
Excessive crossdrafts
Inadequate makeup air
Proper discharge of airway wi
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Inches
Linear feet
Square feet
Cubic feet per minute
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Total pressure of static pressure
Total pressure to velocity pressure
Velocity pressure to static pressure
Static pressure to velocity pressure
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An increase in contaminant control
A decrease in contaminant control
An increase in system resistance
A decrease in system resiste
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Wave
Intensity
Weighting
Power level
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C/T calculation
Noise dosimetry
Sound level meter survey
Hearing conservation program
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Noise dosimetry
Sound level meter survey
Audiometric booth testing
Impulse noise measurements
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Reduce the driving force
Isolate the source from the structure
Use damping to reduce surface response
Build a barrier wall to enclose the source
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113.9-114.1
113.5-114.5
113-115
Exactly 114
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Resonance
Compression
Rarefaction
Amplification
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Threshold of 85 dB(A)
Exchange rate of 3 dB
Criterion level of 90 dB(A)
Upper detection limit of a least 110 dB(A)
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5
7
10
12
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Every 60 seconds
Every 45 seconds
Every 20 seconds
Every 10 seconds
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Octave band
Noise dosimetry
C-A calculation method
Noise reduction rating method
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50-60 dB(A)
45-50 dB(A)
40-45 dB(A)
30-40 dB(A)
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Compliance factor
Time weighted average
Average daily exposure
Daily equivalent sound level
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The maximum level
The minimun level
3 dB(A) less than the maximum level
3 dB(A) more than the minimum level
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Quiz Review Timeline (Updated): Mar 21, 2023 +
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