_____________ photoelectric sensors place the transmitter and receiver in one assembly and often use something like a bicycle reflector to return the light.
A. Through-beam
B. Retroreflective
C. Diffuse
D. Light-level detection
Answer: B
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Many of the newer gas-operated appliances and heating systems use a(n) ____ to ignite the gas flame.
a. thermocouple b. electric arc c. fire eye d. pilot light
Soil test interpretations have been developed so that for most fields testing "low" in a nutrient, addition of that nutrient will increase yield enough to more than pay for the cost of applying the fertilizer
Indicate whether the statement is true or false
A contactor's LRA rating may be:
A) 4 to 5 times as high as its FLA rating. B) 3 to 4 times as high as its FLA rating. C) 8 to 10 times as high as its FLA rating. D) 2 to 3 times as high as its FLA rating.
How do rounded surfaces and circular holes appear in regular view versus auxiliary view?
What will be an ideal response?