1) Internal pressure of 2.5 Mpa acts on a pressure vessel of thickness 15 mm and internal diameter of 1500 mm. What is the stress induced in longitudinal direction?
a. 36.63 N/mm 2
b. 59.13 N/mm 2
c. 65.62 N/mm 2
d. 131.25 N/mm 2
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Answer
Explanation
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ANSWER: 65.62 N/mm2
Explanation:
No explanation is available for this question!
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2) Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm2 to 1.5 N/mm2?
a. Plain formed head
b. Torispherical dished head
c. Semi-elliptical dished head
d. All of the above
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Answer
Explanation
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ANSWER: Torispherical dished head
Explanation:
No explanation is available for this question!
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3) Design pressure for unfired pressure vessels is 1.05 times of _______
a. minimum working pressure
b. maximum working pressure
c. hydrostatic test pressure
d. none of the above
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Answer
Explanation
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ANSWER: maximum working pressure
Explanation:
No explanation is available for this question!
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4) Class 3 pressure vessels having welded joints are __________
a. fully radio-graphed
b. partially radio-graphed
c. spot radio-graphed
d. not radio-graphed
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Answer
Explanation
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ANSWER: not radio-graphed
Explanation:
No explanation is available for this question!
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5) Which type of welded joints are not included in class 3 pressure vessels?
a. Double welded butt joint with full penetration
b. Single welded but joint with back strip
c. Single full fillet lap joints
d. None of the above
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Answer
Explanation
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ANSWER: Single full fillet lap joints
Explanation:
No explanation is available for this question!
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6) In unfired pressure vessels, category A consists of _________
a. joints connecting flanges and flat heads
b. welded joints connecting nozzles with main shell
c. circumferential welded joints joints
d. longitudinal welded joints
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Answer
Explanation
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ANSWER: longitudinal welded joints
Explanation:
No explanation is available for this question!
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7) Which of the following is not an unfired pressure vessel?
a. Heat exchanger
b. Storage vessels
c. Steam boilers
d. None of the above
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Answer
Explanation
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ANSWER: Steam boilers
Explanation:
No explanation is available for this question!
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8) What is the weld joint efficiency if pressure vessel is fabricated with single full fillet lap joint?
a. 1.0
b. 0.55
c. 0.65
d. 0.85
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Answer
Explanation
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ANSWER: 0.55
Explanation:
No explanation is available for this question!
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9) A cylindrical pressure vessel is subjected to an internal pressure of 3 Mpa on internal diameter of 1000 mm. The vessel is fabricated with single weld butt joint with back strip and is not radio-graphed. What is the thickness of flat head, if head made of alloy steel has an ultimate tensile strength of 400 N/mm2 ? (corrosion allowance = 2)
a. 110 mm
b. 120 mm
c. 150.23 mm
d. 152.13 mm
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Answer
Explanation
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ANSWER: 110 mm
Explanation:
No explanation is available for this question!
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10) A cylindrical pressure vessel is subjected to operating pressure of 0.55 Mpa and corrosion allowance of 2. What is the thickness of pressure vessel shell if its internal diameter is 2000 mm? (σall = 120 N/mm2 & ηl = 0.75)
a. 6.5 mm
b. 7 mm
c. 9 mm
d. 9.5 mm
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Answer
Explanation
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ANSWER: 9 mm
Explanation:
No explanation is available for this question!
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