?The use of technology to reduce production time, increase output, and reduce costs began as early as the ______________.
A. ?1920s
B. ?1940s
C. ?1960s
D. ?1980s
Answer: A
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An IR autofocus system has emitter and detector apertures separated by 1cm and modeled as pin holes. The light reflected from an object at range r casts a spot that is detected at a displacement of 0.1mm from the detector axis. The detector lies 0.5cm behind the pin hole. The value of r equals _____ (x.x m)
Fill in the blank(s) with the appropriate word(s).
What is the step-down turns ratio of a transformer with 200 turns in the primary and 100 turns in the secondary?
a. 1:2 b. 2:1 c. 2:2 d. 3:4
Which of the following is the most commonly used lumber grade for framing materials?
A) #2 B) #1 C) Utility grade D) SS
Which of the following is not true regarding assembly drawings?
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