all of them if u can please Which of the program segments is correct for the lad

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all of them if u can please

Which of the program segments is correct for the ladder diagram a) LODN 47. CR1 CR3 CR1 CR3 b) LOD AND CR2 CR4 CR2 CR4 ANDN c) LODN CR3 CR4 d) LOD CR1 CR2 OR OR 48. Why do we use mnemonic code for PLC programming? a) it is easier to use than ladder logic c) it works well with programmer units b) it uses less PLC memory d) it makes the PLC run faster When entering a rung of mnemonic code, the last item entered is always _-. a) the leftmost item in the rung c) the highest numbered contact 49. b) the rightmost branch d) the coil 50. If we enter the mnemonic code LOD LOD LOD OR CR1 CR2 CR3 the "OR LOD" will place a) CR1 in parallel with CR2 c) CR2 in parallel with CR3 b) CR1 in parallel with CR3 d) all three in parallel Chapter 6-Wiring Techniques pared to solid state outputs, one advantage in using relay outputs is that they a) have no moving parts c) can switch at high frequencies b) will never wear out d) can switch both ac and dc 52. The symbol to the right is a form relay contact. a) A b)B c)C d)D 54. NPN outputs are) sinking 55. One advantage in using form C relay outputs that have a single common, is Triac (thyristor) outputs are good for operating loads. 53. a) capacitiveb) battery operatedac a) inefficient a) the relays switch faster d) dc c) unreliable d) sourcing b) the wiring is simpler d) the relays last longer c) the relays have less contact bounce Form B relays have a) one NO contact c) one NC contact b) two NO contacts d) one NO and one NC contact

Explanation / Answer

51 . C ( by the simplicity in designing relays can be operated high frequency )

52 C

53 C

54 D

55 A

56 D

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