Power Engineering 4a - Unit 9 - Plant Instrumentation Questions and Answers Already Passed

Power Engineering 4a - Unit 9 - Plant Instrumentation Questions and Answers Already Passed Automatic systems which can make decisions are termed A) annunciation systems. B) logic systems. C) indicating systems. D) open loop systems. E) cascading systems. B In an automatic control system, the controller output signal manipulates the A) transmitter. B) sensing element. C) recorder. D) control valve. E) primary element. D The second from last step in an automatic boiler programmed shutdown sequence is A) timer motor stops. B) flame failure relay opens. C) post purge completes. D) operating control switch contacts close. E) flame failure switch contacts open. C Analog inputs provided to PLC are typically variable _________ or variable voltage signals from pressure, level, temperature, flow or other transmitters. A) current B) inductance C) resistance D) capacitance E) frequency A During the housekeeping scan, the PLC A) energizes or de-energizes output devices B) communicates with other network devices and programming devices C) executes its programmed logic D) checks the state of all the input devices E) checks the state of all the output devices B ______________ are designed for technical applications. A) Workstations B) Personal computers C) Controllers D) Servers E) Technical laptops A The type of air damper to provide with a much more precise air flow control, especially at small openings, is A) parallel blade damper B) opposed blade damper C) variable outlet vane damper D) variable inlet vane damper B The Chromel-Alumel (Type K) thermocouple can be used in the temperature range of A) -184 oC to 371oC