Which phase angle is generated by a three-phase motor?
A. 30
B. 90
C. 120
D. 180
Answer: C
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Adequate ____________________ will reduce the presence of air contaminants such as dust, molds, and irritating gases from decomposing manure that can cause respiratory problems.
Fill in the blank(s) with the appropriate word(s).
Which of the following has not been an effect of the intensified agriculture of the past 40 years?
A) reduced need to cultivate fragile lands to produce the food required by the world B) imbalanced human nutrition due to decreased production of edible legume crops C) increased use of chemical pesticides D) increased micronutrient levels in the soil E) decreased biological diversity in soil systems
Air in the brake hydraulic system can cause all EXCEPT ________
A) Spongy brake pedal B) May require the driver to "pump up" the brakes before they will stop the vehicle C) Lower than normal brake pedal D) Hard brake pedal
What effect do noncondensable gases have on a refrigeration system?
A) They increase evaporator pressure and decrease compression ratio. B) They create bubbles in the liquid refrigerant stream leaving the compressor. C) They increase condenser pressure and compression ratio. D) They decrease the compression ratio and condenser pressure.