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The version of this CDC we have in the database is 1
1 . 59. (431) Use the following information to answer the next question: Controller = Barber Colman. ; Vcal = 7.5 VDC (at midpoint). ; Spanc = 3 VDC (6 – 9 direct current voltage (VDC). ; Tsp = 70° Fahrenheit. ; TRc = 4° Fahrenheit. ; Action = direct. What is the output voltage (Vout) at 72°F?
9 direct current voltage (VDC).
2 . 77. (624) As air flows from the discharge or intake of a fan to the ends of the duct runs, the gauge pressure
decreases to zero.
3 . 83. (045) Which of the following areas of preventive maintenance procedures are you following when you lubricate and tighten all linkages?
4 . 47. (023) The shape of the flame can be altered from short and bushy to long and narrow in a horizontal rotary burner by
interchangeable cups and air nozzles.
5 . What type of warm-air furnace is known as a high-boy furnace?
6 . 59. (224) What prevents boiler water carryover?
7 . 71. (622) The output capacity of a heat pump is strongly dependent on the
available source of heat.
8 . A single-duct system become a low-pressure reheat system when
heating coils are inserted into the duct system downstream of the cooling coils.
9 . 98. (055) In gas burners what is known as the principal reason for inefficient combustion?
Too much excess air.
10 . 31. (416) When calibrating a dual-input pneumatic controller, you adjust sensors one and two to the set point value. Your next step is to adjust the
output pressure to equal calibration pressure (Pcal).
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