Modulating valve - Study guides, Class notes & Summaries

4th Class Power Engineering Unit A9: Energy Plant Instrumentation and Controls Questions with Verified Solutions A _________ controls the flow of air through ducts or wall openings: Select one: a. damper b. control valve c. fan d. pilot a In a simple control system a process variable is measured and: Select one: a. compared with a set point value b. compared with normal operating trends c. charted in a graph d. charted in the CPU a This type of PLC cannot be expanded: ...

Cause of most freeze up problems in steam coils? 1) Coils handling 100% outside air OR 2) An incorrect blend of outside air and return air. Coil tube length where danger of freeze-up is minimal? 1.1 meters or less. Tube length is negligible as long as the steam trap is properly chosen and the coil is properly piped to ensure proper drainage of the condensate. Freezing occurs in coils with long tube lengths at what temperatures? why? Around -2, -1 degrees C because this situation leads...

Green Awareness Final Test Review UPDATED ACTUAL Exam Questions and CORRECT Answers A fossil fuel furnace that varies it? 's capacity - CORRECT ANSWER- Uses a modulating control valve Energy Management is - CORRECT ANSWER- the monitoring and controlling of energy consuming devices The Coefficient of Performance decreases as the outdoor temperature drops - CORRECT ANSWER- Tru

AN ENGINE BRAKE (JACOBS BRAKE) A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MODULATOR VALVE. (NOT CORRECT AWNSER) D. A RELAY VALVE. ...

AN ENGINE BRAKE (JACOBS BRAKE) A. IS A SELF-ENERGIZING SERVO TYPE. B. IS NORMALLY USED IN PLACE OF A SPRING BRAKE. C. RESTRICTS THE INTAKE PORT AND CAUSES A BUILD UP OF 30-45 LBS OF PRESSURE. D. OPENS THE EXHAUST VALVES NEAR THE TOP OF THE COMPRESSION STROKE TO RELEASE THE COMPRESSED AIR. (CORRECT AWNSER) IN THE SYSTEM SHOWN BELOW, THE PART AT C IS: A. AN INVERSION VALVE. (POSSIBLE CORRECT AWNSER) B. A SAFETY VALVE. C. A MODULATOR VALVE. (NOT CORRECT AWNSER) D. A RELAY VALVE. ...

A fossil fuel furnace that varies it? 's capacity - Uses a modulating control valve Energy Management is - the monitoring and controlling of energy consuming devices The Coefficient of Performance decreases as the outdoor temperature drops - True Photovoltaic panels are used to power - almost everything, including street lighting, NASA satellite equipment and even the grid In order to determine the required capacity of heating and cooling equipment for a structure - a "Heat Load Calculat...

A fossil fuel furnace that varies it? 's capacity - Uses a modulating control valve Energy Management is - the monitoring and controlling of energy consuming devices The Coefficient of Performance decreases as the outdoor temperature drops - True Photovoltaic panels are used to power - almost everything, including street lighting, NASA satellite equipment and even the grid In order to determine the required capacity of heating and cooling equipment for a structure - a "Heat Load Calculat...

Engineers License Study Guide with 100% Complete Solutions secondary - Correct Answer ️️ -What winding is connected to the load? Modulating pressure control - Correct Answer ️️ -Regulates the steam pressure? when there is no pressure on the boiler - Correct Answer ️️ -When can you blow down a water wall? purge - Correct Answer ️️ -What must be done to prevent flashback? kinetic energy - Correct Answer ️️ -Steam at a high velocity is converted into _ _ _ _ _ _ _ _ _ _en...

overheating (low water) or thermal shock What is the maximum size of safety valve permitted on a heating boiler? - Answer-4 1/2 inches What is the function of a boiler vent? - Answer-It is used to vent air from the boiler when filling with water or warming the boiler, and to prevent vacuum from forming when taking the boiler offline. What is the function of low water fuel cut-off? - Answer-It shuts off the boiler burner in the event of a low water What is the function of the operatin...

HVAC Metering Devices Exam Questions with A The piping between the condenser and the metering device is called? A Suction line B Discharge line C Expansion line D Liquid line - Answer-D Liquid line Which component is NOT a type of metering device? A Capillary tube B Bare tube C Automatic expansion valve D Thermostatic expansion valve - Answer-B Bare tube The diagram of an automatic expansion valve separates the atmospheric pressure and the system pressure. A True B False - Ans...