Which of the following statements is NOT true during a PLC scan?
A) The PLC uses the value in the input register to set the conditions for input logic symbols.
B) Input values are scanned first.
C) If the output symbol is active it turns on the output field device and then sets the corresponding bit in the output register to a one.
D) The voltage present at the input terminals determines the value of the input register.
E) If power flow is present in a contact, the contact is highlighted.
C
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Which of the following describes a retroreflective scan?
a. The scanning method in which the light beam transmitted from the transmitter is reflected back to the receiver by the target to be detected b. The scanning method in which the target to be detected passes between the transmitter and receiver, interrupting the light beam c. The scanning method in which the receiver responds only to depolarized light reflected from a corner cube reflector or polarized sensitive tape d. The scanning method in which a target is detected as it passes between a photoelectric sensor and a reflector
Which term means using techniques of soil preparation, planting, and cultivation that disturb the soil the least?
a. conservation tillage b. contour farming c. strip cropping d. crop rotation
Electric adjustable pedals operate _____________
A) Both the accelerator and brake pedal B) Brake pedal only C) Parking brake only D) Accelerator pedal only
Taper pins are used ____.
A. for parts that have to be taken apart frequently B. where removal of straight dowel pins can cause excess hole wear C. for applications that require perfect alignment of accurately constructed parts D. both a and b E. all of the above