Logic DiagramsDOE-HDBK-1016/2-93TRUTH TABLES AND EXERCISESRev. 0Page 15PR-051.Identify by number the following logic symbols:a. ANDb. ORc. Time delayd. Retentive-Memory2.How long must the safety signal be present before the time delay (1) will pass an output(on) signal to Gate 2?3.Under what conditions will Gate 2 turn on?4.Under what conditions will the low flow alarm (5) sound?5.Since the control switch is always in the AUTO position (due to the spring returnfeature), what logic gate keeps the continuous on signal that is generated by the controlswitch being in the AUTO position from starting the fan? What signal must also bepresent to allow the AUTO signal to start the fan?6.If 12 minutes after first receiving a safety signal, with the fan control switch in theAUTO position, the safety signal is removed (off), what will happen to the fan? Why?7.How many ways can the fan be started? How many ways can the fan be stopped?
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