Appendix 1: Self-Test Answer Keys
Competency F1
Self Test 1
- b. Respiration
- a. 48
- d. “Cold 70”
- b. The ideal heat curve
- c. The intensity of heat present
- a. Mass (weight in pounds) × ΔT (in degrees F) × S.H. (specific heat)
- c. 20°F
- d. 140°F
- a. Zoning
- d. 0.045 (1 ÷ 22)
- a. 704150 ft² × (1 ÷ 14) × (72 – 5) = 150 × 0.07 × 67 = 703.5 (round to 704)
- d. The outdoor design temperature
- d. 68°F
- b. 18°C (64°F)
- d. Transmission
- b. Infiltration
- a. 0.04
Outside air film = 0.17;
4″ brick = 0.44; ½″ plywood sheathing = 0.63;
FG insulation = 3.72 × 5.5″ = 20.46;
vapour barrier = 0; ½″ GWB = 0.45;
inside air film = 0.68
Aggregate “R” value = 22.83 “U” value = 1 ÷ 22.83 = 0.04 - d. Low “E” – argon-filled
- c. Thermal bridging
- b. 1,930 BTUH(20 × 15 × 8) ft³ × (2/3 ACH × 0.018) × (72 – 5) = 2400 × 0.012 × 67 = 1,930 BTUH
- c. The rate would double
- a. The rate would be halved
- d. The ODT for the two houses will be different.
- c. 1 ACH
- b. 0.06
- a. 15.0(3 × 5.0/inch)
- a. 1/3 ACH
- c. 22°F
- Windows: (2) × 3′ × 5′ × 0.59 × (72 – -16) = 1,558 BTUH
Net walls: ((11 × 8) + (12 × 8)) – 30 = 154 ft²
154 × 0.05 × 88 = 678 BTUH
Ceiling: (12′ × 11′) × 0.03 × 88 = 348 BTUH
Floor: (12′ × 11′) × 0.05 × 88 = 581 BTUH
Infiltration: (12′ × 11′ × 8′) × (2/3 × 0.018) × 88 = 1,115 BTUH
Total heat loss: 4,280 BTUH - a. 1,164 BTUH(17.5′ × 33.25′) × 0.04 × (65 – 15) = 1,164 BTUH
Competency F2
Self Test 2
- a. PeX “A”
- d. all varieties need oxygen-barrier, whether in wet or dry systems
- c. 2 ½″ polystyrene
- a. in the ceiling below
- a. to give the wall more stability
- c. a heat exchanger
- b. dry systems
- a. reflective foil
- b. they operate at low temperatures is a false statement
- c. make a first pass 6 inches from the outside walls, then turn 180° with another 6-inch pass, then resume normal loop layout
- b. 9″ o.c. from Table (2.2A?)
- c. 40 btuh/ft²
- b. 300 feet is the norm although there may be some manufacturers who differ
- d. 200 ft² – 84.5 ft² = 115.5 ft² of available area. 3050 btuh ÷ 115.5 ft² = 26.41 btuh/ft² of floor output. From Table (2.2A?), this is 9″ o.c. tube spacing. 115.5 × 1.3 (tube spacing factor for 9″ o.c.) = 150 feet of tubing
- b. infra-red thermometer
- c. 2:1
- b. 100 psi for 30 minutes
- b. its output
- a. the single circuit with the highest head loss served by the pump
- c. flow rate and feet of head
- b. #4
- a. 19.2 GPM 48,000 ÷ (5 × 60 × 8.33)
- d. 12,000 12 inches × 1,000 millinches/inch
- d. 9 feet of head 180 measured feet × 1.5 (fitting allowance) = 270 equivalent feet. Under the 400 millinch column, 270 equivalent feet = 9 ft. head
- c. globe
- a. reset control
- c. hydraulic separation
- b. its inner plate surface area
- c. 3.12 feet of head 37,000 btuh ÷ 10,000 btuh/USGPM = 3.7 GPM
(3.7 ÷ 3.2)² = 1.156 1.156² = 1.3369 psi
1.3369 psi × 2.31 ft hd/psi = 3.088 (3.09) feet head - c. a differential bypass valve
- a. flow rate
- a. 17.56 29 feet × .433 psi/ft = 12.56 12.56 + 5 = 17.56 psi
- c. 2.02 USG (45,000 ÷ 59,500) × 2 gal = 1.51 USG 1.51 × 1.34 (temp. adj.) = 2.02
- a. boiler operation
- c. 1 ¼″ 65,000 BTUH on Table 2.8 = 1 ¼″ pipe
Competency F3
Self Test 3
- d. a pole
- c. a throw
- a. by their number of poles and throws
- c. a momentary switch
- b. open on rise
- d. aquastats
- c. a pressure switch
- d. an end switch
- b. 24V AC
- b. 24V AC
- b. the hot leg
- d. EMR
- b. 24V AC
- d. 120V AC
- c. when the coil is energized, the contact positions will reverse
- d. a SPDT switch
- b. a low water cutoff
- c. a DPDT switch
- c. a pressure switch
- d. an SSR
Competency F4
Self Test 4
- d. lowering the aquastat setting on a non-condensing boiler
- b. a secondary heat exchanger
- c. hydraulic separation
- c. 4 diameters apart
- c. 10,000 8.33 lbs/USG x 60 min/hr x 20°FΔT
- a. an end switch
- b. cold start
- d. the lines that represent wires won’t cross each other
- c. on the face of the transformer
- a. “C”
- b. “R”
- d. “Y” and “W”
- a. at the mixing point
- b. in the boiler return piping
- c. a diverting valve has less head loss than a mixing valve
- a. it needs a remote sensor
- b. 1 inlet and 2 outlets
- d. a 4-way mixing valve
- c. outdoor reset
- c (design supply temp – room temp) ÷ (room temp – outdoor design temp)
- a. warm weather shutdown point (WWSD)
- d. a cooling thermostat
- a. a DPDT switch
- a. a normally closed relay contact
- c. the zone valve opens
- c. the pump turns on and the burner fires
- a. 140°F
- d. 2 N.O. contacts
- a. loads
- a. in series, in the burner circuit
- d. 20
- b. near the draft hood
- c. a hot water tank
- c. 2.50 60VA ÷ 24VAC = 2.50A
- b. only the extra thermostats and zone valve motors
- c. the DHW zone valve
- d. none
- b. in parallel
- a. in series
- a. 1
- b. make sure the circuit isn’t powered
- d. turn the adjusting screw so that the pointer is directly over “0”
Competency F5
Self Test 5
- b. wiring that is not factory installed
- c. cable consists of individual wires
- a. to prevent abrasion of the wire insulation
- d. Canadian Electrical Code
- a. metal
- a. gang-able
- d. through knockouts on the box wall
- a. 1.5 m
- b. “Teck” is waterproof; “BX” isn’t
- b. a threaded adapter
- d. galvanized Schedule 40 pipe
- c. a raceway
- d. 100 Watts
- a. maintain at least 2 inches physical distance between them
- b. solderless-type
- c. [latex]\dfrac{5}{8}[/latex]″ – ¾″
- d. a terminal strip
- b. ¼″ – [latex]\dfrac{3}{8}[/latex]″
- d. two bonding wires
- b. a heat sink
