Question 271General Subjects - Assistant Engineer

70% to pass

Referring to the illustrated impulse steam trap, what would be the effect of threading the control cylinder "E" downward further into the trap body? Illustration GS-0002

Diagram for USCG General Subjects Assistant: Referring to the illustrated impulse steam trap, what would be the effect of...

AThe clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk will decrease, and as a result, the pressure drop across the periphery of the valve disk will decrease.

BThe clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk will decrease, and as a result, the pressure drop across the periphery of the valve disk will increase.

CThe clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk will increase, and as a result, the pressure drop across the periphery of the valve disk will increase.

DThe clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk will increase, and as a result, the pressure drop across the periphery of the valve disk will decrease.

AI Explanation

The correct answer is D. Explanation: Threading the control cylinder "E" downward further into the trap body will increase the clearance between the reverse taper of the control cylinder's inner wall and the periphery of the valve disk. This increased clearance will result in a decrease in the pressure drop across the periphery of the valve disk. The other options are incorrect because: A and B describe the opposite effect, where the clearance would decrease, leading to an increase or decrease in pressure drop, respectively. C describes an increase in clearance, which would lead to an increase in pressure drop, contrary to the correct answer.