CDC 4b051 Practice Test

30 Questions | Total Attempts: 310

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CDC Quizzes & Trivia

End Of Course Practice Test


Questions and Answers
  • 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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