4th Class Power Engineering Part 4A Unit 9 Plant Instrumentation and Controls 100% Pass

4th Class Power Engineering Part 4A Unit 9 Plant Instrumentation and Controls 100% Pass ---------- normally used periodically. a. Incremental backup b. Rom backup c. Full backup d. Differential backup c --------------- is a discrete input device. a. temperature alarm b. alarm horns c. level alarm d. warning light e. proximity switch e A "U" tube manometer may be filled with: a. a gaseous substance b. nitrogen c. a granular substance d. heavy oils e. light oils e A Bourdon tube may be manufactured in the shape of a helix so that _______________________ than a standard bourdon tube: a. It has enough power and rotation to move the pens of a recorder without the use of gears b. Higher pressures can be sensed c. They can fit in narrower enclosures d. Its final output has less travel a A circular chart recorder: a. may incorporate a bourdon tube b. is a later design than a strip chart c. is used on a computer screen d. does not provide a permanent record e. provides a different function to a strip chart a A common air pressure range for pneumatic control systems is: a. 3 to 15 kPa b. 40 to 60 psi c. 20 to 30 kPa d. 20 to 100 psi e. 20 to 100 kPa e A computer displays information to the operator via a. a CPU b. a CAD c. a monitor d. an icon c A control loop controller: a. Constantly compares a process variable to the set point b. Eliminates all setpoint deviation c. Measures the manipulated variable value, eliminating the need of a primary element d. Sends a signal to a primary element a A control loop controller: a. sends a signal to a primary element b. will always eliminate deviation c. constantly compares input signals to the set point d. does not require a set point value e. measures the manipulated variable value, eliminating the need of a primary element c A control valve that has one plug that moves upward to close the port is called: a. direct acting single ported b. reverse acting diaphragm actuated c. double seated direct acting d. electrically operated e. reverse acting single ported e