![]() ![]() What adjustment must be made to the temperature value taken from the conversion tables to calculate the actual temperature at the measuring tip of the thermocouple? Room temperature surrounding the panel is 80☏. The actual reference junction is located in a panel that is maintained at 120☏. The tables are based on a thermocouple reference junction temperature of 32☏. If the RTD develops an open circuit (bridge circuit remains intact), temperature indication will failīecause of a thermocouple temperature display failure, the millivolt output of a thermocouple circuit is being converted to a temperature value using conversion tables. Question 11:Ī resistance temperature detector (RTD) is used in a balanced bridge circuit to indicate temperature. What effect does the leak have on the affected flow indication?Ī) The measured ΔP will increase, causing indicated flow to decrease.ī) The measured ΔP will decrease, causing indicated flow to increase.Ĭ) The measured ΔP will decrease, causing indicated flow to decrease.ĭ) The measured ΔP will increase, causing indicated flow to increase. If the pressure sensed by a bourdon tube increases, the curvature of the detector will _ because the greater force is being applied to the _ curve of the detector.Ī leak develops in the high-pressure side of a flow detector. If the temperature of the extension wires increases, the electrical resistance of the extension wires will _ and the temperature indication will _ unless temperature compensation is provided. Question 8:Ī simple two-wire resistance temperature detector ( RTD) is being used to measure the temperature in a water system.Ĭopper extension wires run from the RTD to a temperature measuring instrument 40 feet away. If the valve is subsequently closed, flow indication willĪ) increase and stabilize at the actual flow rate.ī) increase and stabilize above the actual flow rateĭ) decrease and stabilize at 0 gpm. If shorting occurs within a resistance temperature detector, the associated indication will failĪ flow instrument for an operating cooling water system was calibrated with the differential pressure flow detector equalizing valve slightly open. ![]() The purpose of the condensing chamber is toĪ) prevent reference leg flashing during a rapid depressurization of the reactor vessel.ī) ensure the reference leg temperature remains near the temperature of the water in the reactor vessel.Ĭ) provide a source of makeup water to the reference leg during normal operations.ĭ) provide reference leg compensation for the reactor pressure exerted on the variable leg. ![]() Many reactor vessel water level instruments are designed with a condensing chamber in the reference leg. If cooling water flow rate is increased to 1,000 gpm, differential pressure across the flow transmitter venturi will be… In contrast to a thermocouple, a resistance temperature detectorĪ) uses a single type of metal or alloy in the sensing element.ī) is commonly placed in direct contact with the monitored substance.Ĭ) does not require an external power supply for temperature indication.ĭ) is used in high temperature applications Question 3:Īs water flows through a venturi flow element, the _ pressure and the _ velocity of the fluid occurs at the throat of the venturi.Ī cooling water system is operating at a steady-state flow rate of 700 gpm with 60 psid across the flow transmitter venturi. The cooling water system surge tank level is being measured using a differential pressure level detector that has been calibrated at the current water temperature in the tank.Ī leak in the heat exchanger results in lube oil collecting in the surge tank.Īssuming that the temperature of the contents in the surge tank does not change, the indicated surge tank level will be _ than actual surge tank level because lube oil is _ than water. Question 1:Ī cooling water system is cooling a lube oil heat exchanger. Click on the below start button to get complete 150+ questions with answers. Measuring Instrumentsįind the sample 25 questions from the measuring instruments quiz. Check out the 150+ measuring instruments questions and answers for instrumentation engineers and technicians.
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