4b051 Bioenvironmental Engineering Journeyman CDC Ure Questions Vol. 5
- 1.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.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.
- 3.Less resistance and better contaminant capture in a ventilation system can be realized by using
- A.
An air cleaner.
- B.
Higher velocities.
- C.
Elbows in the ducting
- D.
A flange or tapered hood.
- 4.How can friction losses in a ventilation system be reduced?
- A.
Decrease the hood size.
- B.
Increase the duct length.
- C.
Increase the duct velocity.
- D.
Increase the duct diameter.
- 5.A density factor of one means that the air you are dealing with is at
- A.
A high altitude.
- B.
Elevated temperature.
- C.
High barometric pressure.
- D.
Standard temperature and pressure conditions.
- 6.Which type of velocity refers to the speed of air at a point in front of a hood that is needed to pull contaminants into the hood?
- A.
Face velocity.
- B.
Duct velocity.
- C.
Capture velocity.
- D.
Transport velocity.
- 7.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.Areas of ducts and hoods must be expressed in
- A.
Inches.
- B.
Linear feet.
- C.
Square feet.
- D.
Cubic feet per minute.
- 9.What circumstance would result in a high K factor?
- A.
Adequate mixing of air.
- B.
Higher contaminant toxicities.
- C.
An even evolution of contaminant.
- D.
A high occupational exposure limit.
- 10.What 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 volume.
- 11.A minimum K factor of four is used in dilution ventilation for fire and explosion control because
- A.
Very toxic chemicals are involved.
- B.
Good air distribution cannot be achieved.
- C.
Concentrations must be kept at or below 25% of the lower explosive limit (LEL).
- D.
Concentrations must be kept at or below 25% of the upper explosive limit(UEL).
- 12.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.
- 13.Two major advantages of local exhaust enclosures are that they provide
- A.
Better protection for the equipment and less noise.
- B.
The best contaminant control with the lowest air volume.
- C.
Better air distribution with the elimination of disturbances.
- D.
Easier worker access to the process and lower operating costs.
- 14.The purpose of using splitter vanes, multiple takeoffs, or baffles inside of a local exhaust hood is to provide
- A.
A reduction in system resistance.
- B.
An increase in hood static pressure.
- C.
Proper discharge of air away from inlets.
- D.
Uniform air distribution across the hood face.
- 15.Increasing the velocity of air through a slot hood without increasing the air flow volume most often 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 resistance.
- 16.What type of ventilation system survey would Bioenvironmental Engineering (BE) perform on a new ventilation system to verify it is operating properly before putting it into service?
- A.
Routine survey.
- B.
Baseline survey.
- C.
Initial acceptance survey
- D.
Contaminant source survey.
- 17.In a routine survey, ventilation system data collected during the routine assessment should be compared to
- A.
Key parameters.
- B.
Factory findings.
- C.
Previous routine survey data.
- D.
Data collected during the baseline survey.
- 18.When performing face velocity measurements, what must you do just before measuring the air flow of a ventilation system?
- A.
Calibrate the survey meter.
- B.
Take static pressure measurements.
- C.
Identify the key parameter for the system.
- D.
Measure out or mentally form a grid over the duct opening.
- 19.What important procedure must you follow to obtain accurate readings with a velometer?
- A.
Hold the probe parallel to the air flow.
- B.
Always make two traverses at right angles to one another.
- C.
Choose a section of the duct with smooth flow for measurement.
- D.
Hold tube so that the mark aligns with the side of the duct and point tube directly into the air stream.
- 20.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 cross drafts.
- C.
Inadequate makeup air.
- D.
Proper discharge of air away from inlets.
- 21.What is the purpose of the inner tube that makes up a pitot tube?
- A.
Detect total pressure.
- B.
Detect static pressure.
- C.
Determine the duct diameter.
- D.
Determine the density factor.
- 22.What can be said of velocity pressure when measured across the duct?
- A.
It is constant across the duct.
- B.
It is weak along the sides and becomes weaker as you near the center.
- C.
It is weaker along the sides and becomes stronger as you near the center.
- D.
It is stronger along the sides and becomes weaker as you near the center.
- 23.When evaluating ventilation systems using the pitot traverse method, what step is performed after balancing the system?
- A.
Prepare the equipment for use.
- B.
Find a suitable measurement point.
- C.
Take velocity pressure measurements.
- D.
Identify the key parameter for the system.
- 24.The range of acceptable values for the air flow volume on routine tests is within what percentage of the baseline value?
- A.
25%.
- B.
20%.
- C.
15%.
- D.
10%.
- 25.Two sources of indoor air contamination are interior air and
- A.
Volatile organic compounds (VOC).
- B.
Exterior air.
- C.
Inadequate ventilation.
- D.
Combustion contaminants.
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