Which instrument can be employed to determine the speed of a submerged submarine in deep water__________________?
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Answer: E. pitot tube
Explanation
A pitot tube measures fluid stagnation pressure and static pressure to determine local flow velocity. Submerged submarines move through water, so a pitot sensor measures relative water speed accurately. Bernoulli principle relates the pressure difference measured by the tube directly to the vehicle speed. Henri Pitot invented the pitot tube in the early eighteenth century to measure fluid flow velocity. Aircraft and submarines both rely on pitot static systems for measuring dynamic speed relative to fluids. The device converts kinetic energy of the moving fluid stream into measurable static pressure head.
Marine vessels use pitot logs to monitor navigation speed through deep water ocean environments. Aerodynamic testing wind tunnels utilize pitot tubes to map velocity profiles around scale models. Reliable speed measurement is essential for underwater navigation, depth control, and safety. Option A represents a venturimeter, which requires a restricted pipe section to measure internal flow rates. Option B uses an orifice plate inserted inside pipes, making it unsuitable for external submarine speeds. Option C is a hot wire anemometer used mainly for measuring gas turbulence and localized velocities.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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