On some headers, evenly spaced ____ marks appear in the horizontal and vertical directions outside the border. This helps readers of the drawing locate areas on the sheet where specific features can be found.
A. border
B. header
C. title block
D. location grid
Answer: D
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Thermal overload units are widely used on both the fractional and integral horsepower manual starters for protection of motors from sustained electrical overcurrents that could result from overloading of the driven machine or from ____.
a. excessively low line voltage b. excessively low power load c. excessively high line voltage d. excessively high power load
________ dormancy combines physical and physiological dormancy that must be satisfied sequentially to permit germination.
Fill in the blank(s) with the appropriate word(s).
A refrigerator using a 0.5 hp motor has a coefficient of performance of 3.05. 2 gallons of tea (model as water) is placed into the refrigerator at 80oF. How long will it take for the refrigerator to cool the tea to 40oF, assuming that this is the only heat load to be considered. Does this seem realistic? If not, what assumptions were made which make the calculation appear unrealistic?
Given: ?= 3.05; W?= -0.5 hp = 0.3534 Btu/s; Water: V= 2 gal = 0.2674 ft3; T1 = 80oF; T2 = 40oF Assume: The refrigerator is operating in a cyclic fashion. The water behaves as an incompressible substance with constant specific heats: c = 1 Btu/lbm-RSolution: What will be an ideal response?
Due to very low current consumption by digital IC inputs, a pull-up resistor can provide a logic high with an open switch
Indicate whether the statement is true or false