TOPIC: KNOWLEDGE: K1.01 [2.5/2.7] An atmospheric pressure of 15.0 psia is equivalent to... A psig. B psig. C psig.
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1 P73 An atmospheric pressure of 15.0 psia is equivalent to... A psig. B psig. C psig. D. 0.0 psig. ANSWER: D. P273 A pressure gauge on a condenser reads 27.0 inches Hg vacuum. What is the absolute pressure corresponding to this vacuum? (Assume a standard atmospheric pressure of 15.0 psia.) A psia B psia C. 1.5 psia D. 1.0 psia ANSWER: C. -1-
2 P473 Assuming a standard atmospheric pressure of 15.0 psia, 5.0 inches Hg vacuum is equivalent to... A. 2.5 psia. B. 5.0 psia. C psia. D psia. ANSWER: D. P873 If a main steam line pressure gauge reads 900 psig, what is the absolute pressure? A. 870 psia B. 885 psia C. 915 psia D. 930 psia ANSWER: C. -2-
3 P1173 Which one of the following is equivalent to 5 psia? A. 20 psig B. 10 psig C. 10 inches of mercury (Hg) vacuum D. 20 inches of mercury (Hg) vacuum ANSWER: D. P1273 Which one of the following is arranged from the lowest pressure to the highest pressure? A. 8 psia, 20 inches Hg absolute, 2 psig B. 8 psia, 2 psig, 20 inches Hg absolute C. 20 inches Hg absolute, 2 psig, 8 psia D. 20 inches Hg absolute, 8 psia, 2 psig ANSWER: A. -3-
4 P1573 Which one of the following is arranged from the highest pressure to the lowest pressure? A. 2 psig, 20 inches Hg absolute, 8 psia B. 2 psig, 8 psia, 20 inches Hg absolute C. 8 psia, 20 inches Hg absolute, 2 psig D. 8 psia, 2 psig, 20 inches Hg absolute ANSWER: A. P1773 Which one of the following is approximately equivalent to 2 psig? A. 11 psia B. 13 psia C. 15 psia D. 17 psia ANSWER: D. -4-
5 P2073 Which one of the following is arranged from the lowest pressure to the highest pressure? A. 2 psig, 12 inches Hg absolute, 8 psia B. 2 psig, 18 inches Hg absolute, 8 psia C. 12 psia, 20 inches Hg absolute, 2 psig D. 12 psia, 30 inches Hg absolute, 2 psig ANSWER: D. P2173 Which one of the following is the approximate condenser vacuum when condenser pressure is 16 inches Hg absolute? A. 4 inches Hg vacuum B. 8 inches Hg vacuum C. 12 inches Hg vacuum D. 14 inches Hg vacuum ANSWER: D. -5-
6 P2273 Which one of the following is arranged from the highest pressure to the lowest pressure? A. 2 psig, 12 inches Hg absolute, 8 psia B. 2 psig, 18 inches Hg absolute, 8 psia C. 12 psia, 20 inches Hg absolute, 2 psig D. 12 psia, 30 inches Hg absolute, 2 psig ANSWER: B. -6-
7 P374 (B373) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at the same constant water level with 17 psia gas pressure above the water. The tanks are surrounded by standard atmospheric pressure. The temperature of the water in the tanks and reference legs is 70 F. Which one of the level detectors is sensing the greatest D/P? A. No. 1 B. No. 2 C. No. 3 D. No. 4 ANSWER: B. -7-
8 P573 (B1873) An enclosed water storage tank is pressurized with nitrogen to prevent air inleakage. Tank pressure is allowed to vary as water level changes. A differential pressure detector is used to measure the tank level. To achieve the most accurate level measurement, the low pressure side of the detector should sense which one of the following? A. The pressure at the midline of the tank. B. The pressure of the atmosphere surrounding the tank. C. The pressure of a column of water external to the tank. D. The pressure of the gas space at the top of the tank. ANSWER: D. -8-
9 P709 (B710) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at 17 psia and 70 percent water level (calibration conditions). They are located in a building that is currently at atmospheric pressure. If the building ventilation system creates a vacuum in the building, which level detectors will provide the lowest level indications? A. 1 and 3 B. 1 and 4 C. 2 and 3 D. 2 and 4 ANSWER: B. -9-
10 P1673 (B1174) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at 2 psig overpressure, the same constant water level, and a temperature of 60 F. They are surrounded by atmospheric pressure. If a leak in the top of each tank causes a complete loss of overpressure, which detector(s) will produce a lower level indication? A. No. 1 only B. No. 2 only C. No. 1 and 4 D. No. 2 and 3 ANSWER: D. -10-
11 P2373 (B2373) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at 2 psig overpressure, 60 F, and the same constant water level. The tanks are located within a sealed containment structure that is being maintained at standard atmospheric pressure. All level detectors have been calibrated and are producing the same level indication. If a ventilation malfunction causes the containment structure pressure to decrease to 13 psia, which detectors will produce the lowest level indications? A. 1 and 3 B. 2 and 4 C. 1 and 4 D. 2 and 3 ANSWER: C. -11-
12 P2574 (B2573) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at 2 psig overpressure, 60 F, and the same constant water level. The tanks are located within a sealed containment structure that is being maintained at standard atmospheric pressure. All level detectors have been calibrated and are producing the same level indication. If a ventilation malfunction causes the containment structure pressure to decrease to 13 psia, which detectors will produce the highest level indications? A. 1 and 2 B. 3 and 4 C. 1 and 4 D. 2 and 3 ANSWER: D. -12-
13 P2673 (B73) Refer to the drawing of a water-filled manometer (see figure below). The manometer is installed across an orifice in a ventilation duct to determine the direction of airflow. With the manometer conditions as shown, the pressure at P1 is than P2; and the direction of airflow is. A. greater; left to right B. greater; right to left C. less; left to right D. less; right to left ANSWER: A. -13-
14 P2873 (B1073) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical with equal water levels and 20 psia gas pressure above the water. The tanks are surrounded by standard atmospheric pressure. The temperature of the water in the tanks and reference legs is 70 F. If each detector experiences a ruptured diaphragm, which detector(s) will produce a lower level indication? (Assume that actual tank and reference leg water levels do not change.) A. No. 1 only B. No. 2 only C. No. 1, 2, and 3 D. No. 2, 3, and 4 ANSWER: D. -14-
15 P2973 (B673) Refer to the drawing of a water-filled manometer (see figure below). The manometer is installed across an orifice in a ventilation duct to determine the direction of airflow. With the manometer conditions as shown, the pressure at P1 is than P2; and the direction of airflow is. A. less; right to left B. less; left to right C. greater; right to left D. greater; left to right ANSWER: A. -15-
16 P3173 (B3173) A water storage tank is vented to atmosphere. The tank is located at sea level and contains 100,000 gallons of 80 F water. A pressure gauge at the bottom of the tank reads 5.6 psig. What is the approximate water level in the tank? A. 13 feet B. 17 feet C. 21 feet D. 25 feet ANSWER: A. -16-
17 P3673 (B3673) Refer to the drawing of a tank with a differential pressure (D/P) level detector (see figure below). If the tank contains 30 feet of water at 60 F, what is the approximate D/P sensed by the detector? A. 7 psid B. 13 psid C. 20 psid D. 28 psid ANSWER: B. -17-
18 P3873 (B3873) A water storage tank is vented to atmosphere. The tank is located at sea level and contains 100,000 gallons of water at 80 F. A pressure gauge at the bottom of the tank reads 7.3 psig. What is the approximate water level in the tank? A. 13 feet B. 17 feet C. 21 feet D. 25 feet ANSWER: B. P4537 (B4537) A water storage tank is vented to atmosphere. The tank is located at sea level and contains 100,000 gallons of water at 80 F. A pressure gauge at the bottom of the tank reads 9.0 psig. What is the approximate water level in the tank? A. 13 feet B. 17 feet C. 21 feet D. 25 feet ANSWER: C. -18-
19 P4837 (B4837) Refer to the drawing of two water storage tanks with four differential pressure (D/P) level detectors (see figure below). The tanks are identical and are being maintained at 2 psig overpressure, the same constant water level, and a temperature of 60 F. The tanks are surrounded by atmospheric pressure. All level detectors have been calibrated and are producing the same level indication. If a leak in the top of each tank causes a complete loss of overpressure in both tanks, which detector(s) will produce the highest level indication(s)? A. No. 1 only B. No. 2 only C. No. 1 and 4 D. No. 2 and 3 ANSWER: C. -19-
20 P5837 (B5837) Refer to the drawing of an open water storage tank with a differential pressure (D/P) level indicator that is vented to atmosphere (see figure below). Both the tank and the level indicator are surrounded by standard atmospheric pressure. Tank water temperature is 70 F. The D/P level indicator is sensing a differential pressure of 4.0 psi. What is the water level in the tank above the instrument penetration? A. 9.2 feet B feet C feet D feet ANSWER: A. -20-
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