HVAC PLANT - Practice Mode

1) Which process increases the specific humidity of air at constant dry bulb temperature?

Humidification of air Sensible cooling of air Sensible heating of air Dehumidification of air

Correct Answer: Humidification of air

2) Which process decreases the dry bulb temperature of air at constant specific humidity?

Humidification of air Sensible cooling of air Sensible heating of air Dehumidification of air

Correct Answer: Sensible cooling of air

3) What is the direction of airflow delivered in a centrifugal blower?

Parallel to the shaft Perpendicular to the shaft Inclined throw of air vertically Inclined throw of air horizontally

Correct Answer: Perpendicular to the shaft

4) Which property is considered for a temperature range in selecting a lubricant oil?

Natural Artificial Viscosity Cost effective

Correct Answer: Viscosity

5) Which device controls the air flow in ducting system?

Grille Damper Register Diffuser

Correct Answer: Damper

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