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EPRI Exam Study Guide New Latest Version with All Questions from Actual Past Exam Updated 2024/ 2025
Typology: Exams
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The component of a gauge which produces the movement which allows the indication of pressure is the... --------- Correct Answer --------- bourdon tube A transmission line is rated at 1000 MVA. The power flow is currently 0 MW and 1001 MVar. Is this transmission line overloaded? (EPRI Chapter 3 , number 4) a. Yes b. No c. Cannot be determined d. The line has no load ----------- Correct Answer ---------- a. Yes The Total Transfer Capability ( TTC ) limit has been determined to be 1000 MW from east to west for a transmission path. The operator sells 500 MW on this path. What is this path's Available Transfer Capability (ATC)? (EPRI Chapter 3 , number 5) a. 1000 MW b. 1500 MW c. 0 MW d. 500 MW ----------- Correct Answer ---------- d. 500 MW An absolute pressure gauge that has been properly calibrated at sea level will read ____________at an elevation of 5000 feet. --------- Correct Answer --------- 12.23 psi A primary standard used for the measurement of pressure would be... --------- Correct Answer --------- A manometer What magnitude of frequency change would cause a 5 % droop generator to move its generator from zero to full output in a 60.00 Hz system? (EPRI Chapter 4 , similar to number 13) a. 10 Hz b. 6 Hz c. 5 Hz d. 3 Hz ----------- Correct Answer ---------- d. 3 Hz What is the MVar production of a 50 MVar shunt capacitor that is energized at 90 % of its nominal voltage?
(EPRI Chapter 5 , number 1) a. 40. b. 45 c. 55. d. 61.7 ----------- Correct Answer ---------- a. 40. A 5 % change in voltage will typically lead to what change in the total load magnitude? (EPRI Chapter 5 , number 2) a. 2 % b. 3 % c. 5 % d. 10 % ----------- Correct Answer ---------- b. 3 %
a. Electrojets b. Geomagnetic induced currents c. Resonance d. Transient voltages ----------- Correct Answer ---------- b. Geomagnetic induced currents The currents induced by geomagnetic disturbances enter the power system through which path? (EPRI Chapter 9 , number 7) a. Series capacitors b. Shunt capacitors c. Transformer delta windings d. Transformer grounded neutrals ----------- Correct Answer ---------- d. Transformer grounded neutrals During a GMD event , harmonic currents may trip which device? (EPRI 9-60) a. Shunt capacitors b. HVDC c. Transformers d. Generators ----------- Correct Answer ---------- a. Shunt capacitors Why is shunt capacitor tripping a problem during geomagnetic disturbance ( GMD ) activity? (EPRI Chapter 9 , similar to number 9) a. High frequency geomagnetic induced currents ( GIC ) flow into the shunt capacitor b. Geomagnetic induced currents ( GIC ) saturate transformers which creates high frequency harmonics which cause the shunt capacitors to trip c. Geomagnetic induced currents ( GIC ) enter the power system through grounded neutrals of the shunt capacitors d. Shunt capacitors trip from high ESP ----------- Correct Answer ---------- b. Geomagnetic induced currents ( GIC ) saturate transformers which creates high frequency harmonics which cause the shunt capacitors to trip Why are high transmission system voltages problems more likely than low transmission system voltage problems during the initial stages of restoration? (EPRI Chapter 11 , similar to number 1) a. Excessive MVar supply from too many on-line generators b. Too much reactive power load c. Too much real power load
d. Excessive MVar supply from the energization of transmission lines ----------- Correct Answer ---------- d. Excessive MVar supply from the energization of transmission lines Early stages of system restoration with a frequency of 59.0 Hz The System Operator want to restore frequency to 60.0 Hz. What action should the System Operator take? (EPRI Chapter 11 , similar to number 7) a. Re - dispatch generation b. Re - configure the transmission system c. Shed 6 to 10 % of the connected load d. Shed 3 to 5 % of connected load ----------- Correct Answer ---------- c. Shed 6 to 10 % of the connected load You are in power system restoration mode , 500 MW of generation is synchronized with 300 MW of spinning reserve available. What is the largest load block that should be restored to maintain acceptable frequency control ?(EPRI Chapter 11, similar to number
a. 150 MW b. 50 MW c. 25 MW d. 10 MW ----------- Correct Answer ---------- c. 25 MW When is HVDC used? (EPRI 10-40) a. To connect two AC systems that operate at different frequencies b. Interconnect systems that operate asynchronously c. Transmission system losses are lower than AC transmission d. All of the above ----------- Correct Answer ---------- d. All of the above The simplest electrical temperature measurement device is a --------- Correct Answer --- ------ thermocouple The manipulated variable is the part of the process that is adjusted to close the gap between the set point and the value of the _____________ variable --------- Correct Answer --------- controlled To re-write the configuration information contained in a smart transmitter's EEPROM the ________________ command must be activated on the HART communicator. --------- Correct Answer --------- SEND On the Kelvin scale the freezing point of water is ... --------- Correct Answer --------- 273.15 deg. K
A temperature transmitter that has a range of - 100 to +450 degrees F. What will be the output of the transmitter if the input is 137 degrees F? --------- Correct Answer --------- 237/550=.4309(16)+4=10.89mA A pressure switch, PSL1022, which has been calibrated with a set point of 14 psi has its normally closed contact connected in series with 120volt AC circuit. If the voltage measures across the contact is 0 volts it would be a an indication that the pressure applied to the switch is... --------- Correct Answer --------- Below 14 psi The simplest device for measuring pressure is the... --------- Correct Answer --------- Manometer A relay with 2 sets of contacts would be designated with the letters... --------- Correct Answer --------- DPST Atransmitter which produces an output of 4-20mA for an input of 75-275 degrees F would have a gain of... --------- Correct Answer --------- .08mA/uf What is the value of a resistor that is color coded, yellow - orange - oragne - silver? ------ --- Correct Answer --------- 43000ohms +/-10% An advantage to using a bubbler for level measuring applications would be that... --------
The temperature of a transmitter is 20-300 degrees F. The output signal is 3-15 psig. What would be the expected output signal for an input temperature of 175 degrees F? -- ------- Correct Answer --------- 195/320=.609(16)+3=9.64 psig Most flow measurements occur under __________________ conditions. --------- Correct Answer --------- turbulent Six cubic feet of a liquid is 400 pounds. the Specific Gravity of the liquid is... --------- Correct Answer --------- 400/(62.4306=374.58) = 1. Full compensation of a remote reading thermometer would typically be provided by... --- ------ Correct Answer --------- secondary capillary An increase in viscosity of a liquid will result in a ________ Reynolds number --------- Correct Answer --------- lower A tank contains 9 cubic feet of a liquid. The liquid weighs 470 pounds. The specific gravity of the liquid is... --------- Correct Answer --------- 470/(62.439=561.87)=.836inwc In most process control systems the process measurement is derived from a... --------- Correct Answer --------- sensor A type of OPEN CHANNEL flow meter which is typically used to measure WATER flow is the ... --------- Correct Answer --------- Parshall Flume when using a voltmeter without a reference junction to measure the out put of a thermocoulple it is necessary to... --------- Correct Answer --------- Subtract the reference junction millivolts from the instruments voltage reading A type of level transmitter which would require that the vessel containing the liquid was open to the atmosphere would be a... --------- Correct Answer --------- bubbler A bubbler has the following instruments connected as part of the control loop; FI1001, PCV1001, LIT1001, LIC1001. Which device would most commonly be used for the flow indicator? --------- Correct Answer --------- Rotameter The most common unit of measure for liquid pressure or level is... --------- Correct Answer --------- inches of water The temperature at which the moisture in the air will become saturated and begin to be deposited as condensation is... --------- Correct Answer --------- Dew Point a circuit having the resistance of 100 ohms and an applied voltage of 48 volts will consume ____________ of power. --------- Correct Answer --------- 48/100=.48(48)=23.04watts
When checking the calibration of a differential pressure transmitter you find that it renders readings at the 25%, 50%, and 75% test points which are substantially higher than anticipated. This would indicate that the instrument probably has... --------- Correct Answer --------- Square root extraction the symbol "TE1002" would most likely represent a... --------- Correct Answer --------- Thermocouple Loss of signal from a compensation lead of a smart temperature transmitter with a three wire RTD will usually cause an output condition which will be... --------- Correct Answer - -------- Dependent upon the setting of the failure mode. Temporary information storage is usually done in --------- Correct Answer --------- RAM A DC milivlt signal could be used to provide anINPUT to a(n) __________ transmitter --- ------ Correct Answer --------- PH The differential pressure produced across an orifice plate will be proportional to... --------
200 MW is scheduled to flow from Bus " X " to Bus " Y ". Transmission line " A - B " has a 10 % distribution factor for this schedule. How much of the 200 MW schedul will flow on transmission line A-B (EPRI Chapter 3 , number 10) a. 20 MW b. 40 MW c. 180 MW d. 200 MW ----------- Correct Answer ---------- a. 20 MW According to the load / frequency relationship , a 1 % change in frequency will lead to what approximate magnitude of load change in a typical 10,000 MW system? (EPRI Chapter 4 , number 1) a. 500 MW b. 1000 MW c. 200 MW d. 50 MW ----------- Correct Answer ---------- c. 200 MW A governor with a 0 % droop is called: (EPRI Chapter 4 , number 2) a. Flat frequency control b. Transient droop c. A blocked governor d. An isochronous governor ----------- Correct Answer ---------- d. An isochronous governor A Balancing Authority's frequency bias setting is equal to EPRI Chapter 4 , number 4 ) a. The control area's frequency response characteristics ( FRC ) b. The natural response of the balancing area c. The AGC system's bias value d. All of the above ----------- Correct Answer ---------- d. All of the above
Phase Shifting Transformers are used for what? (EPRI 10-40) a. Tool for controlling the flow of MW b. Control impedance c. To consume MVAR from the system d. Control voltage level ----------- Correct Answer ---------- a. Tool for controlling the flow of MW What is the primary safety concern for nuclear power plant operations? ---------- Correct Answer --------- Preventing significant radiation exposure to the public during routine and accident conditions. How is the primary safety concern for nuclear power plant operations achieved? ---------- Correct Answer --------- Employing fission product barriers and engineered safety features. Identify ways a core can fail ---------- Correct Answer --------- Any loss of core geometry, particularly into a configuration where cooling becomes impractical, is considered a core failure List three ways that the core has an inability to fully remove the heat created by the fuel ---------- Correct Answer --------- 1. A failure of the heat removal systems
Defined as hypothesized events that affect one or more of the radioactive material barriers and that are not expected during plant operations ---------- Correct Answer ------- -- Accidents What are two accident types that are considered? ---------- Correct Answer --------- 1. Mechanical failure of a single component leading to the release of radioactive material from one or more barriers
Emergency Operating Procedure / Operator Action Tech Spec Limit Design / Test Limit Break Point List some safety limits for a BWR: ---------- Correct Answer --------- - Maintain thermal power less than some maximum Reactor Thermal Power (RTP) with low reactor coolant system pressure and low core flow.
if the condition doesn't improve, it could perform the other. ---------- Correct Answer ------ --- Automatic trips / relief The operators are scanning the safety significant parameters to make sure they are not moving too far out of the setpoints without action being taken. If the parameters asses the point where and automatic trip or relief should have taken place, operating procedures will have the operators take action. ---------- Correct Answer --------- Emergency operating procedures / Operator action All alarms or actions taken before this point should prevent the equipment from reaching the tech spec limit. The plant is analyzed to survive a design basis accident with the parameter less than that value. This is the plant's licensing basis. ---------- Correct Answer --------- Tech Spec Limit This is the highest value fro a specified parameter that a piece of equipment is designed to survive and remain operational. In some cases, this is the value where the equipment was tested ---------- Correct Answer --------- Design/ Test Limit The point where the equipment actually fails is somewhere above the design limit. There is no way to know this value without an actual failure ---------- Correct Answer ----- ---- Break point In a pressurized water reactor, the core is cooled while at power by which of the following mechanisms? ---------- Correct Answer --------- Thermal energy from the fuel is transferred to the reactor coolant that then flows out of the reactor vessel to the steam generator, where the thermal energy is used to produce steam. In a boiling water reactor, the core is cooled while at power by which one of the following mechanisms? ---------- Correct Answer --------- Thermal energy from the fuel is transferred to the reactor coolant to produce steam in the reactor vessel. What system in a PWR is normally used immediately after a unit shutdown to remove decay heat? ---------- Correct Answer --------- Reactor Coolant System, Natural Circulation Which of the following are other options to remove decay heat when primary fluid temperatures are too low to support adequate steam formation in the steam generators? ---------- Correct Answer --------- Residual Heat Removal System What four conditions must be present for natural circulation to occur? ---------- Correct Answer --------- 1. A heat source (the reactor core)
Which of the following is an indication that natural circulation is occurring? ---------- Correct Answer --------- A RCS core exit thermocouple temperatures are stable or decreasing Method for injecting large amounts of makeup water into the reactor core during accident / emergency conditions, when the normal method of core heat removal is insufficient or unavailable ---------- Correct Answer --------- Safety Injection (SI) List the four Emergency Core Cooling Systems in a BWR ---------- Correct Answer ------- -- - High pressure core spray
Identify the critical parameters monitored during accident conditions in a PWR ---------- Correct Answer --------- - RCS Wide range Thot & Tcold Temperatures