Book 2 Unit 1 Flashcards
The __________ filter is the best filter available for the removal of fine dust, smoke, and fumes.
A) Electronic
B) Electrostatic
C) Mechanical
D) Viscous impingement
E) Dry
B) Electrostatic
The presence of air in a steam heating system is undesirable since it will:
A) Reduce the heat transfer
B) Reduce the operating pressure
C) Decrease the condensate flow
D) Increase the steam flow
E) Cause the relief valve to fail
A) Reduce the heat transfer
Steam in a two-pipe, vacuum return system is supplied pressures up to:
A) 75 kPa (10psi)
B) 103 kPa (15 psi)
C) 15 kPa (2 psi)
D) 50 kPa (7 psi)
E) 200 kPa (30 psi)
B) 103 kPa (15 psi)
Building air infiltration should be kept to a minimum a certain amount of fresh air is required to provide ___________ within the building.
A) Cooling
B) Ventilation
C) Heating
D) Humidification
E) Dust control
B) Ventilation
Thermal resistance (R) is the:
A) Thermal heat flow through a unit area of a non-uniform, composite material when a unit average temperature difference is established between the surfaces (W/m2ºC)(Btu/hr/ft2ºF)
B) Thermal heat flow, by conduction only, through a unit area of a single uniform type of material (W/mºC)(Btu/hr/ft2ºF)
C) Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m2ºC/W)(ft2ºF/Btu/hr)
D) Thermal heat flow (transmission) through unit areas of a wall, door, window, etc. for every degree temperature difference between the air/fluid inside and the air/fluid outside. (W/m2K or W/m2ºC)(Btu/hr/ft2R or Btu/hr/ft2ºF)
E) Quantity of heat flow from all mechanisms, in unit time, under the conditions prevailing at that time (Q or W)
C) Reciprocal of thermal conductance, it is the value of a given material’s ability to resist heat transfer or flow (m2ºC/W)(ft2ºF/Btu/hr)
With a warm air heating system if there is insufficient heat throughout the building the trouble could be:
A) Air filters are dirty
B) The bonnet temperature is at least 65ºC (150ºF)
C) An adequate amount of air is supplied to all rooms and to provide good air distribution
D) The thermostat is accurate
E) Occupied and unoccupied areas receiving adequate heat
A) Air filters are dirty
An advantage of the forced circulation hot water heating system is:
A) The response to changes in heating load is more rapid
B) Positive circulation can not be established to all heating units
C) Increased power and maintenance
D) Noisier operation
E) Larger pipes must be used
A) The response to changes in heating load is more rapid
In the electrostatic precipitator the positively charged dust particles are attracted to the metal ________ plates.
A) Neutral
B) Collector
C) Ionizing
D) Grounded
E) Parallel
B) Collector
The rooftop heating unit is basically a ____________ air heater mounted on the roof.
A) Duct
B) Lowboy
C) Horizontal
D) Vertical
E) Highboy
C) Horizontal
One of the ways that heat is transmitted is by:
A) Conservation
B) Convection
C) Insulation
D) Construction
E) Occupation
B) Convection
Which of the following should not be included in the routine operation of a hot water heating system?
A) Keeping the boiler room and boiler clean and tidy
B) Test the controls on regular basis
C) Keep covers on all controls
D) Make sure that the air supply to the boiler room is closed
E) Test the safety relief valve on a regular basis
D) Make sure that the or supply to the boiler room is closed
The purpose of the heat exchanger in a forced warm-air furnace is to exchange.
A) Combustion gas heat with air
B) Hot water heat with air
C) Steam heat with air
D) Air heat with combustion gases
E) Air heat with air
A) Combustion gas heat with air
The piping and heating units of a steam heating system must be so arranged that:
A) Steam can flow in sufficient quantities to all heating units
B) The condensate can flow freely from the boiler
C) The condensate can be returned freely to these units
D) The air can be contained in the heating units piping
E) Steam can flow freely from all heating units
A) Steam can flow in sufficient quantities to all heating units
If there is restricted air flow through a heating unit the operator should check all but:
A) Air passages are not restricted
B) Damper plates are fully closed
C) A carpet is not restricting the air flow
D) Curtains are restricting the air flow
E) The filter is not plugged
B) Damper plate are fully closed
Calculate the relative humidity of a sample of air that at 21ºC (70ºF) holds 0.01 kg (0.022 lb) of moisture if the maximum that it can hold at this temperature is 0.015 kg (0.033 lb)
A) 25.8%
B) 0.33%
C) 93.3%
D) 10.7%
E) 66.7%
E) 66.7%
