What information is necessary to determine a system balance point?
A) The manufacturer's installation instructions, which publish the equipment balance point
B) The balance point is determined as part of the heat load study before the equipment is chosen.
C) A heat load calculation and the system capacity at two operating conditions
D) The balance point for all AHRI rated heat pumps is 35°F.
C
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Three alternatives identified as X, Y, and Z were evaluated by the B/C method. The analyst calculated project B/C values of 0.92, 1.34, and 1.29. The alternatives are listed in the order of increasing equivalent total costs. The analyst is not sure whether an incremental analysis
(a) What do you think? If no incremental analysis is needed, why not; if so, which alternatives must be compared incrementally? (b) For what type of projects is incremental analysis never necessary? If X, Y, and Z are all this type of project, which alternatives should be selected based on the calculated B/C values? What will be an ideal response?
Refer to Figure 1. A multi-tap transformer has 1,620 turns in the primary. There are 40 turns between each tap. Taps 6 and 3 are connected. Which taps must be connected to reduce output voltage by 5%?
a. 5 and 4
b. 6 and 2
c. 7 and 4
d. 7 and 2
The electricity in our homes and offices is largely due to the work of Benjamin Franklin.
Answer the following statement true (T) or false (F)
Which lumber is classified as both hard and soft?
a. oak c. willow b. ash d. maple