The ultrasonic leak detector uses a __________ to locate escaping refrigerant or nitrogen.
A. flame
B. light
C. microphone
D. pump
Answer: C
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In an insulated concrete block wall, a _____ should be applied to seal off the joint.
A. center bed joint B. head joint C. sled runner joint D. closure block
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The potential relay is easy to troubleshoot because only two parts of the relay must be checked.
Answer the following statement true (T) or false (F)
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Determine the reactions of the structure in P3.1.
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Fig. 10.136 shows a Hartley oscillator. Show that the frequency of oscillation is  FIGURE 1.png)
 FIGURE 1.png)
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