Exam (elaborations)
CIH Ventilation Questions and Answers 100% Solved
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Exam of 10 pages for the course CIH at CIH (CIH Ventilation)
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CIH VentilationEnclosing hood - answer Surrounds contaminant, prevents from escaping
Backdraft hood - answer Draws air away from BZ towards equip rear
Rotating vane anemometer - answer Paint spray booth opening
Shake out hood baffles - answerProvide better air distribution
Double duct's airflow - answer Friction loss quadruples
Blast gates - answer Balance resistance to airflow in ducts
Dilution ventilation - answer Used for low toxicity vapors
Reynolds number - answer Describes flow (turbulent or laminar) in a duct
>4000 Re - answer Turbulent
<4000 Re - answer Laminar
Critical orifice - answerplate Measures flow inside duct
Slot hood - answerLocal exhaust electroplating tank
Central vacuum - answerRemoves material/aerosols from the area
General ventilation - answerNot for particulate or toxic gases/vapors
Hood static pressure - answerEnergy necessary to move and accelerate air
50 fpm - answerPossible face velocity due to natural factors
Balance with blast gate - answerBranches of duct balance differential >0.1
Determine variation in fan speed - answerFan size, duct system & air density
Greatest capture velocity - answerNeeded for grinding operations
Pitot traverse - answerSystematic equal area velocity measurements
, In IH air is considered - answerAn incompressible fluid
Canopy hoods - answerAllow contaminant to pass through worker's breathing zone
Round ducts are ______ than square ducts - answerStronger
Smoke tubes used in - answerWet air with velocities <150 fpm
Velometer - answerMeasures airflow rates
Measures static pressure - answerU tube manometer, magnehelic gauge & inclined
manameter
Propeller fan - answerA wide selection of quality; rugged
Aspect ratio of an exhaust hood - answerRatio of width to length
Local exhaust ventilation - answerRemove contaminants at their source
Independent of slot air velocity - answerCapture velocity
Function of slot in slot hood - answerObtain proper air distribution
Change in static pressure - answerCauses air to move (high ➡️
low)
G=M/T - answerSolvent generation rate equal to mass of solvent evaporated over
evaporation time
H=F x VP - answerEnergy loss = loss coefficient x velocity pressure
Pitot tube measures - answerTotal pressure and static pressure
Pitot tubes take measurements - answerInside of ducts
Velometers and thermoanemometers can measure vent systems - answerAt diffusers
and inlets
Center point velocity x ___ = average duct velocity - answer0.9 (rule of thumb)
Total pressure is - answerMeasured parallel to the axis of flow
Pitot tube - answerInstrument used to measure turbulent air
4000 feet/minute - answerVelocity recommended for an industrial duct
Straight blade fans - answerMedium speed and low particle buildup
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