CDC 4b051 Practice Test
End Of Course Practice Test
- 1.(401) In ventilation work, what pressure is exerted outward against the interior surface of an enclosure?
- A.
Positive static
- B.
Negative static
- C.
Positive velocity
- D.
Negative velocity
- 2.(401) After the fan of a ventilation systemis turned on, there is a conversion of
- A.
Total pressure of static pressure
- B.
Total pressure to velocity pressure
- C.
Velocity pressure to static pressure
- D.
Static pressure to velocity pressure
- 3.(401) The value for velocity pressure in a ventilation system is
- A.
Always positive
- B.
Always negative
- C.
Negative on the blowing side
- D.
Negative on the exhausting side
- 4.(402) Friction losses in a ventilation system can be reduced by increasing the
- A.
Hood size
- B.
Duct length
- C.
Duct velocity
- D.
Duct diameter
- 5.(403) A density factor of one means that the air you are dealing with is at
- A.
A high altitude
- B.
Standard conditions
- C.
Elevated temperature
- D.
High barometric pressure
- 6.(403) which type of velocity refers to the ability of a ventilation system to remove contaminants from a work area?
- A.
Face velocity
- B.
Duct velocity
- C.
Capture velocity
- D.
Transport velocity
- 7.(404) What are two parameters at a given point in ventilation systems that are needed to calculate the air flow volume?
- A.
Area and pressure
- B.
Area and velocity
- C.
Velocity and pressure
- D.
Diameter and velocity
- 8.(404) Areas of ducts and hoods myst be expressed in
- A.
Inches
- B.
Linear feet
- C.
Square feet
- D.
Cubic feet per minute
- 9.(405) Which is the maximum amount of a certain chemical vapor that air can hold at a given temperature?
- A.
Vapor pressure
- B.
Explosive limit
- C.
Saturation concentration
- D.
Required air flow volumes
- 10.(406) Other than good contaminant control, what is the biggest advantage of local exhaust over dilution ventilation?
- A.
Less noise
- B.
Lower operating costs
- C.
Better protection for equipment
- D.
Easier worker access to the process
- 11.(407) Increasing the velocity of air through a slot hood without increasing the air flow volume most ofter results in
- A.
An increase in contaminant control
- B.
A decrease in contaminant control
- C.
An increase in system resistance
- D.
A decrease in system resiste
- 12.(408) What may be indicated by a very strong flow coming in an open door of a room containing a local exhaust system?
- A.
Adequate makeup air
- B.
Excessive crossdrafts
- C.
Inadequate makeup air
- D.
Proper discharge of airway wi
- 13.(409) The range of acceptable values for the air flow volume on routine tests is within what persentage of the baseline?
- A.
25%
- B.
20%
- C.
15%
- D.
10%
- 14.(410) At the beginning of a sound wave, the molecules near the source are drawn away from the surrounding air to form an area of lower atmospheric pressure. This process is known as
- A.
Resonance
- B.
Compression
- C.
Rarefaction
- D.
Amplification
- 15.(410) Which is a sound wave that can be characterized by a single frequency?
- A.
Pure Tone
- B.
White Noise
- C.
Complex sound
- D.
Reference sound
- 16.(411) What is the characteristic of sound that we measure and report when we quantify sound?
- A.
Wave
- B.
Intensity
- C.
Weighting
- D.
Power level
- 17.(412) What term would describe hearing loss due to an explosion?
- A.
Tinnitus
- B.
Acoustic Trauma
- C.
Threshold shift
- D.
Auditory Fatigue
- 18.(413) Identifying equipment that produces hazardous moise at the operator's position is the purpose of what?
- A.
C/T calculation
- B.
Noise dosimetry
- C.
Sound level meter survey
- D.
Hearing conservation program
- 19.(414) Assuming that altitude is not a factor, within what range should a sound level meter read when a 114 dB calibrator is placed over the microphone?
- A.
113.9-114.1
- B.
113.5-114.5
- C.
113-115
- D.
Exactly 114
- 20.(414) If the sound level readings during one measurement difer by more that 6 dB(A), record the result as
- A.
The maximum level
- B.
The minimun level
- C.
3 dB(A) less than the maximum level
- D.
3 dB(A) more than the minimum level
- 21.(415) What characteristic should a noise dosimeter have for measurements to be compared to Air Force standards?
- A.
Threshold of 85 dB(A)
- B.
Exchange rate of 3 dB
- C.
Criterion level of 90 dB(A)
- D.
Upper detection limit of a least 110 dB(A)
- 22.(415) When would be considered the most appropriate time to conduct a noise dosimetry survey?
- A.
Just before or after a weekend
- B.
During a workplace inspection
- C.
If the workload is temporarily increased
- D.
When workdays are representative of normal shifts
- 23.(416) How many meadurements do you take with an octave band analyzer during a survey?
- A.
5
- B.
7
- C.
10
- D.
12
- 24.(417) How often are audiometric test booths monitored?
- A.
Monthly
- B.
Annually
- C.
Quarterly
- D.
Bi-annually
- 25.(418) Noise dosimeters that indicate the daily dose as a percentage need to be converted to the
- A.
Compliance factor
- B.
Time weighted average
- C.
Average daily exposure
- D.
Daily equivalent sound level
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