HVAC TEST Questions With 100% Correct Answers.

Humidity is expressed as - relative humidity or humidity ratio A grain is the unit of measure that equals______lb - 1/7000 Wet bulb temperature readings indicate the amount of - moisture in the air One pound of dry air and its associated moisture at standard conditions has a pressure of _____Hg - 29.92 Directly relates to the amount of pressure in the air - wet bulb temp humidity ratio relative humidity all the above A change in both dry bulb and wet bulb temperature affects - enthalpy Engineers and air conditioning technicians use_______ to define properties of moist air during process that changes the properties of air - psychrometric chart When moist air is heated, sensible heat is added and there is _______ change in humidity - no ____________is the point that represents the properties of air before it goes through a process - initial condition The properties of cool air are found by locating the______________ of air on the chart and identifying the appropriate properties of the air at each point -final condition and initial condition_____________ is the measurement of sensible heat - dry bulb temp Humidity can be measured with a - psychrometer or hygrometer If the dry bulb volume temp decreases, the specific volume will________________ - decrease Enthalpy is the sum of latent and _______heat - sensible ________ is the volume of a substance per unit of the substance - specific volume Enthably is expressed in - BTU per pound relative humidity is _________% at the saturation line - 100% Resistance (R-factor) in construction is defined as - index of material's tendency to impede heat flow The higher the "R" value - the lower the "U" value is the process of introducing fresh air into the building - ventilation