In the feedback system in Figure E-4 
What range of real values of K makes this system stable?
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When used outdoors, photosensors should be aimed due _____.
a. north b. south c. east d. west
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When one side of the secondary winding of a control transformer is grounded, the control system is referred to as a(n) ____________________ system.
Fill in the blank(s) with the appropriate word(s).
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Two basic categories of chillers are the ____.
A. compression cycle and absorption B. purge and absorption C. absorption and lithium bromide D. purge and lithium bromide
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The purpose of an externally equalized thermostatic expansion valve is to ____.
A. compensate for excessive evaporator pressure drop B. allow system to equalize faster C. prevent the expansion valve from frosting up D. allow refrigerant to expand in the compressor
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