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In the inclined manometer shown in the figure below, the reservoir is large. Its surface may be assumed to remain at a fixed elevation. A is connected to a gas pipeline and the deflection noted on the inclined glass tube is 100 mm. Assuming q = 30° and the manometric fluid as oil with specific gravity of 0.86, the pressure at A is
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- 43 mm water (vacuum)
- 43 mm water
- 86 mm water
- 100 mm water
Correct Option: B
Pressure at A = Poil. g. hoil
= Poil g. (l. × sinθ)
= (0.86 × 1000) × 9.81 × (0.1 × sin 30°)
= 421.83 N/m2
Also, Pressure at A = Pw .g.hw
⇒ 421.83 = 1000 × 9.81 × hw = 43 mm of water
