The motor-generator set has one inherent advantage over rectifier-type DC supplies, that is, ____.
a. the fact of being relocatable
b. being easy to replace when they fail
c. the ability to regenerate
d. being much less expensive
c. the ability to regenerate
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Grafting of plants was practiced as early as 1500 B.C
Indicate whether the statement is true or false
The partial pressure of oxygen in the atmosphere is 0.21 bar and that of nitrogen 0.78. Which of the following partial pressure levels would you expect to find in the pores of a moderately well-drained soil?
A) 0.15 (oxygen) B) 0.21 (oxygen) C) 0.50 (nitrogen) D) 0.30 (oxygen) E) 0.80 (nitrogen)
Draft curtains or curtain boards increase the effectiveness of smoke vents by:
A. reducing the dissipation of the heated air currents from a fire and reducing the speed of operation of the vents.
B. reducing the dissipation of the heated air currents from a fire and increasing the speed of operation of the vents.
C. increasing the circulation of the heated air currents from a fire, but decreasing the speed of operation of the vents.
D. increasing the circulation of the heated air currents from a fire and increasing the speed of operation of the vents.
The formula for ____ is the average annual heating divided by average annual power consumption.
A. AFUE B. HSPF C. SHF D. SEER