Commercial Hydronic Systems
Commercial Hydronic Systems
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Question 1 |
A hot-water boiler capable of working at water temperatures above 250°F would be classified as a
_____ boiler.
A | low-pressure |
B | medium- or high-pressure |
C | copper-finned tube |
D | cast-iron |
Question 2 |
A steel boiler design in which the flue gases are contained inside the tubes and the heated water is
circulated outside the tubes is called a _____ boiler.
A | cast-iron |
B | steel watertube |
C | copper-finned tube |
D | steel firetube |
Question 3 |
Electric boilers control heating capacity by _____.
A | reducing the water flow rate |
B | controlling how much of the heating element is immersed in the water |
C | varying the voltage to the heating elements |
D | activating or deactivating individual heating elements |
Question 4 |
Water flow switches are generally used on a(n) _____ boiler.
A | electric |
B | copper-finned tube |
C | cast-iron |
D | steel firetube |
Question 5 |
When an air elimination strategy is used for hydronic system air management, a _____ is used to
seperate the air cushion from the water.
A | purge reservoir |
B | commercial air separator |
C | bladder-type expansion tank |
D | compression tank |
Question 6 |
Centrifugal pumps are typically used for applications _____.
A | containing thick and heavy fluids |
B | that require large pressure differentials |
C | that do not require extreme pressure differentials |
D | other than commercial hydronic systems |
Question 7 |
A multistage centrifugal pump contains one or more _____.
A | discharge fittings |
B | pump drive shafts |
C | drive motors |
D | impellers |
Question 8 |
A valve commonly installed on the discharge side of a hydronic pump in a large system is the
_____ valve.
A | multi-purpose |
B | butterfly |
C | gate |
D | flow meter |
Question 9 |
Three-way valves are typically employed for _____.
A | mixing and draining |
B | mixing and diverting |
C | mixing and flow balancing |
D | diverting and flow balancing |
Question 10 |
The condenser in a chiller unit cools the _____.
A | water circulating through the cooling tower |
B | chilled water as it circulates through the building |
C | chiller system refrigerant |
D | system secondary coolant so that it condenses into a liquid |
Question 11 |
One style of chiller that is available in capacities as low as 5 tons is the _____ chiller.
A | absorption |
B | non-mechanical |
C | reciprocating |
D | centrifugal |
Question 12 |
A device used to remove unwanted air from the refrigerant circuit of a low-pressure chiller is the
_____.
A | air separator |
B | purge unit |
C | expansion tank |
D | air vent |
Question 13 |
In an induced-draft cooling tower, air _____.
A | is pushed through the tower horizontally |
B | is pushed through the tower by a fan |
C | circulates through the tower by natural thermal air currents |
D | is drawn through the tower by a fan |
Question 14 |
An air handling unit generally produces airflows in excess of _____ cfm.
A | 1,000 |
B | 500 |
C | 2,000 |
D | 100 |
Question 15 |
In a two-pipe, dual temperature hydronic system, changeover from the heating mode to the
cooling mode cannot occur until _____.
A | the boiler is sufficiently heated |
B | cooling is needed in every area of the building |
C | the outdoor temperatures are above 70°F |
D | the water temperature in the piping is cool enough to prevent over-pressurization or
overloading of the chiller |
Question 16 |
In a primary-secondary loop system, the transfer of water between the two loops occurs _____.
A | in the common pipe |
B | in the primary loop |
C | at the primary pump inlet |
D | in the secondary loop |
Question 17 |
In a primary-secondary loop chilled water system, each primary pump is sized to _____.
A | accommodate the flow requirements of the water-cooled condenser |
B | handle the flow through all connected chillers simultaneously |
C | handle only the head and flow rate of its related chiller |
D | also provide flow through the secondary loop at low cooling loads |
Question 18 |
Before attempting to balance a water system, you should _____.
A | ensure that none of the mechanical systems have been turned on yet |
B | ensure that the boiler and/or chiller have been started up per the manufacturer's instructions |
C | always ensure that air balancing has first been completed |
D | not allow circulating pumps to operate until the balancing procedure is completed |
Question 19 |
At the highest point in a piping system, static pressure is _____.
A | 0.433 psi |
B | at its maximum |
C | 0 psi |
D | 1 psi |
Question 20 |
One Bohp equals _____ watts.
A | 9.8 |
B | 200 |
C | 22.5 |
D | 433 |
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