Engine : Steam Plants - 299/811
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| Which of the following statements concerning the design of balanced throttle valves is correct? |
| A) The ahead throttle valve normally utilizes a guarding valve. |
| B) Both ahead and astern valves normally have a positive opening tendency. |
| C) They commonly use a conventional valve disc and a balance piston. |
| D) They commonly use two parallel seats and a balance cylinder. |
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