Basic Loop checking Interview Questions Leave a Comment / By Sivaranjith / March 13, 2018 Welcome to your Quiz.This quiz is about Loop checking. it contains 20 questions 1. In a pneumatic loop diagram, tube and bundle numbers appear in rectangles are written on or near the signal line appear in the notes section are connected with a curved arrow to the signal line 2. To change the 4 to 20 mA analog signal from a transmitter to the signal required by a digital controller, a (an)______ must be a part of the instrument signal loop. I/PTransducer Signal Conditioner D/P Transmitter A/D Converter 3. A typical process control loop component would be which of the following? sensor controller final control device all of the above 4. A diamond on an instrumentation diagram endoses information about: calibration. The setpoint controller action the power source 5. A process is _____ if heat input is required to produce a reaction. endothermic continuous intermittent exothermic 6. A process is ______if heat is produced by a reaction. endothermic continuous intermittent exothermic 7. A control valve with a direct acting actuator and is air to close will: fail closed maintain position fail open fail indeterminate 8. A pneumatic valve actuator that operates over an instrument signal range of 9-15 psi is referred to as: split range fail safe air to close fuli range 9. Process instrument connection lines are indicated on an instrumentation diagram by: bold solid lines fine solid lines. bold broken lines. fine broken lines. 10. The transmission signais considered standard for most instrument systems are: 4 to 20 psi and 3to15 mA. O to 24 volts and O to 20 psig. 3 to 15 psig and 4 to 20 mA. O to 20 mA and O to 15 psig 11. In most process control systems the final control element is a: transmitter sensor controller valve 12. The statement; “Thermocouple extension wires must have the same thermoelectric properties as the thermocouple that they are used with,” is: true, if the extension wires are submerged in the process fluid true in all installations. false. Extension wires must be made from either copper or brass. false. The type of extension wire makes no difference 13. To convert the output from a thermocouple to a standard 4 to 20 mA instrument signal, a(n) with cold junction compensation would be used. I/PTransducer P/I Transducer D/A Converter mV/I Transducer 14. Central connection points for signal lines are called: instrument ports. junction boxes input/output junctions field ports 15. A pneumatic control valve, without a positioner, is the final control element in an instrument loop. The transmitter and controller are both electronic. In order for this control system to operate, a(an) must be installed in the instrument signal line between the controller and the control valve. I/P Transducer MV/I Transducer D/A Converter P/I Transducer 16. In an electronic loop diagram, junction box connections are represented by: circles diamonds ellipses squares 17. On an instrumentation diagram, the loop identification: consists of two, three, or four letters. is the same for all instruments in a specific loop. identifies the measured or initiating variable appears in the upper portion of the instrument balloon 18. A device that changes a voltage signal to a current signal is normally referred to as a(an): P/I Transducer E/I Transducer D/P Transmitter V/C Converter 19. Iron constantan thermocouples are designated by the letter: T J B S 20. The thermostat for a central air conditioning system is set at 68°F. This value is an example of the: manipulated variable. deviation. set point controlled variable For more Knowledge please visit: Automationforum.in Automationforum.co Time's up
