A.B. Hopkins Generating StationCirculating Water System

July 6 2014Test Bank of Questions Unit 2 HPA

Test Bank of Questions

Circulating Water System
HOPKINS REPOWERING PROJECT
UNIT HP2A

1.TH-HOP-04 Close Cooling Water Pumps

What would be a possible cause of Low Suction Pressure to the Close Cooling Water Pumps?

  1. High Discharge Pressure/High Discharge Temperature
  2. Low Expansion Tank level/Restricted Coolers
  3. Low Suction Temperature/Low Discharge Pressure
  4. High Expansion Tank Level

2.TH-HOP-04 Close Cooling Water Pumps

Which of the following is a consequence of Low Suction Pressure to the Close Cooling Water Pumps?

  1. Loss of Cooling to subsystems
  2. High Expansion Tank Level
  3. Low Expansion Tank Level
  4. Loss of cooling across Plate Heat Exchangers

3. TH-HOP-04 Close Cooling Water Pumps

What is the Normal Operating Discharge pressure on the Close Cooling Water Pumps?

  1. 15 psig
  2. 30 PSIA.
  3. 10 psig
  4. 14.7 PSIA
  1. TH-HOP-04 Deaerator / LP Steam Drum

Which is not a function of the Expansion Tank?

  1. Preheat Demineralized Water Makeup.
  2. Provides NSPH.
  3. Provides capacity for heat induced water expansion.
  4. Provides surge capacity.
  1. TH-HOP-04Circulating Water Pumps

What is the function of the suction strainers?

a. Measure Differential Pressure

b. Controls Differential Flow

c. Provides NSPH.

d. Captures Particulates.

6. TH-HOP-04 Plate Heat Exchangers

What is the purpose of the Plate Heat Exchangers?

a. Throttle flow to coolers in the distribution system

b. Ensures pressure across coolers in the distribution system.

c. Maintains pressure on the closed circulating water system.

d. Removes heat from the Circulating Water loop.

7 TH-HOP-04Circulating Water Bypass Control Valve WCFCV033

Which of the following purpose of Control Valve FCV033?

  1. Back pressure control on Circulating Water Pumps
  2. Close Cooling Water Return Header Flow Controller.
  3. Common Suction Header pressure controller.
  4. Circulating Water Bypass minimum flow control valve.

8. TH-HOP-04Circulating Water System Chemical Addition

What is the reason for the Glycol addition to the Closed Cooling Addition?

  1. Increases boiling point.
  2. Decrease boiling point
  3. PH Buffer.
  4. Water softener

9. TH-HOP-04Circulating Water Pumps

How is the discharge header pressure controlled on the Circulating Water loop?

  1. Bypass Control Valve WCFCV033
  2. Throttling Valves On the Outlet of the Ct Generator Coolers
  3. Expansion Tank Head pressure

d. Varying the speed of Circulating Water Pumps

10. TH-HOP-04 Bypass Control Valve WCFCV033

Which of the following will cause Bypass Control Valve WCFCV033 to open?

  1. Based on flows down stream of the plate heat exchangers
  2. Based on the supply header flow
  3. Based on the return header temperature
  4. Based on flows down stream of the CT Generator and LCI Coolers

11. TH-HOP-04

What is the minimum flow required for stable operation of the Circulating Water Pumps

a. 958 GPM

b. 150 GPM

c. 860 GPM

d. 277 GPM

12. TH-HOP-04Circulating Water Flow

How is the flow controlled through the LF/AA Module Coolers.

a. By the variable frequency drive

b. By the discharge header pressure

c.By outlet Butterfly Valve WC088 LF/AA Module Coolers

d.By suction header pressure.

13. TH-HOP-04Plate Heat Exchangers

What is the cooling medium for the Plate Heat Exchangers?

  1. Auxilliary Cooling Water System.
  2. Glycol
  3. Chemical inhibitor
  4. Demineralized Water

14. TH-HOP-04Circulating Water System

From the choices Listed below, which is not a subsystem of the Circulating Water System?

  1. CT Generator Cooler
  2. Surface Condenser
  3. LF/AA Module
  4. Steam and water Analysis Panel
  1. TH-HOP-04 Close Cooler Water Pump

What flow streams provide suction to the Close Cooling Water Pump?

a. Circulating Water Return Header flow and Glycol Feed

b. Circulating Water Return Header flow and Demineralized water makeup

c. Low pressure feed water and Demineralized Water makeup

d. Demineralized Water makeup and Service Water

  1. TH-HOP-04Circulating Water Variable Frequency Drive

Which of the following statement is false?

  1. The variable frequency drive controls the speed of the pumps
  2. The Variable Frequency Drive control the discharge header pressure
  3. The Variable Frequency Drive operates as a feed forward control loop
  4. The control system (DCS) provides signals to the Variable Frequency Drive
  1. TH-HOP-04Circulating Water Pumps

Which of the following in not considered a functional subsystem/component of the Circulating Water System?

  1. Gas Turbine Base Coolers
  2. LCI Module Coolers
  3. LF/AA Module Cooler
  4. 4160 Volts Switchgear
  1. TH-HOP-04Circulating Water Pumps

Which of the following is a consequence of high discharge header pressure?

a. Temperature Increase across coolers

b. Temperature Decrease across coolers

c. Variable Frequency Drive Over speed

d. Variable Frequency Drive Amps low

  1. TH-HOP-04 Circulating Water System

Which of the following is a consequence of high discharge header flow?

  1. Temperature decrease across coolers.
  2. High discharge pressure
  3. Low pressure differential across suction strainers.

d. High discharge temperature

  1. TH-HOP-04Circulating Water Pumps

What is the solution mix for the chemical addition to the Circulating Water loop?

  1. 25% Glycol solution and Demineralized Water.
  2. 20% Glycol solution and Demineralized Water.
  3. 30% Glycol solution and Demineralized Water.

d. 40% Glycol solution and Demineralized Water.

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