To construct a binary up-counter out of J-K flip-flops with a count sequence of 0-1-2-3-4-5-6, which gate must be used to reset all flip-flops?
A) a NAND gate connected to outputs 21 and 22
B) a NOR gate connected to outputs 21 and 22
C) a NAND gate connected to outputs 20, 21, and 22
D) a NAND gate connected to outputs 20 and 22
C
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Answer the following statement(s) true (T) or false (F)
1. Contacts must be selected according to the proper load. 2. Limit switches may be momentary contact or maintained contact types. 3. Capacitive proximity sensors are designed to detect only metallic targets. 4. Inductive proximity switches operate on the eddy current principle. 5. Some reflector units have a range of 2 feet or more.
Why are many capacitive proximity detectors being used to replace mechanical limit switches?
What will be an ideal response?
What percent of 30 is 45?
A. 45 B. 15 C. 66.67 D. 150
If the piping to be blocked is stainless steel connecting to carbon steel, the test blind should be _____.
a. aluminum b. stainless steel c. carbon steel d. moly steel