Exam (elaborations) BOMA-HVAC 2107

The man whose work is considered the real beginning of the science of air-conditioning _____. - ANSWER Willis Carrier Psychrometry refers to the relationship between _____ and _____. - ANSWER Humidity; air The amount of moisture in the air compared to how much it can hold is _____. - ANSWER Relative humidity The human bodies well being depends upon the _____. - ANSWER Bodies metabolism The device used to determine the moisture content of air is the _____ - ANSWER psychrometer Of the fuels listed the one that is the most efficient is _____. - ANSWER Gas The effective temperature takes into consideration the effect of _____ and _____. - ANSWER Humidity; temperature Air conditioning is the control of the _____, _____, _____ and _____. - ANSWER Temperature, humidity, purity and distribution of air. The element that makes up the greatest percentage by volume of air is _____. - ANSWER Nitrogen Steam gives off a great amount of heat because of its _____. - ANSWER Specific heat The velocity of air moving thru a fan system is expressed in _____. - ANSWER Feet per minute What volume of air will move thru a duct 24x18 at velocity of 450 feet per minute? - ANSWER 1350 cfm The following types of fans are classified as centrifugal fans. - ANSWER Forward curved, radial and backward curved Select the statement that does not apply to backward inclined fans. - ANSWER Has an overloading BHP horse power curve. The quantity of air moving thru a fan system is expressed in _____. - ANSWER Cubic feet per minute The instrument used to measure air pressure in duct is the _____. - ANSWER Monometer Air flow thru a duct has the highest _____. - ANSWER Velocity near the center of the duct. Select the statement which does not apply to the fan laws. - ANSWER Static pressure in a duct increases as the velocity decreases. Variable air volume system feature is _____. - ANSWER Varies the volume of air with space temperature conditions Double duct systems are _____. - ANSWER ? The purpose of a primary control is to _____. - ANSWER Start or stop the system A pressurestat responds to _____. - ANSWER System pressure The oil safety switch is operated by _____. Oil pressure - ANSWER A low limit control _____. - ANSWER ? A high limit control _____. - ANSWER ? Limit controls _____. - ANSWER Are wired i