Most HVACR systems operate on:
A) Modulating current (MC). B) Direct current (DC).
C) Alternating current (AC). D) Natural current (NC).
C
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The type of high-intensity discharge (HID) lamp that has excellent color rendition is the _____.
a. metal halide lamp b. high-pressure sodium lamp c. mercury vapor lamp d. low-pressure sodium lamp
The roots from forests prevent _____ and help to provide clean water
A) soaking in B) runoff C) rain D) habitat
A farmer started irrigating a soil some 10 years ago, but in recent years, yields have declined, and the soil's physical condition has deteriorated. Which of the following most likely accounts for this situation?
A) high gypsum content in the soil B) high content of Ca and Mg in the irrigation water C) failure to use conservation tillage to reduce salt accumulation at the soil surface D) excessive drainage of the soil E) high SAR of the irrigation water
Which device protects the air pump from reverse exhaust pressure?
A) Check valve B) IAC valve C) PCV valve D) EGR valve