What does the statement that the specific weight of water is 1000 kg/m” signify_________________?
Show answer Hide answer
Answer: D. all the above
Explanation
The specific weight of water is standardized under precise environmental reference conditions. Atmospheric pressure of 760 millimeters of mercury represents standard sea level pressure. Water reaches its maximum density and specific weight value at four degrees Celsius. Specific weight is defined as weight per unit volume of a substance. Water density changes slightly with temperature variations and ambient pressure changes. Standard engineering calculations reference water properties at these exact physical conditions.
Hydraulic engineers use standardized water properties for accurate pump and pipe sizing. Fluid mechanics experiments rely on these exact reference values for calibration purposes. Deviations from standard temperature and pressure require correction factors in calculations. Pressure alone is insufficient without specifying the correct temperature reference point. Temperature alone does not define specific weight without establishing atmospheric pressure. Mean sea level establishes the standard pressure baseline rather than complete conditions.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
Related questions
Q1. What are the standard shell dimensions (diameter and length) of a locomotive boiler_______________?
Show answer Hide answer
Answer: A. 1.5 m, 4 m
A standard locomotive boiler typically features a cylindrical shell with a diameter of about 1.5 meters and a length of 4 meters. These compact dimensions fit within the strict clearance gauge limits imposed by railway t...
Q2. In what direction does the resultant of all normal pressure forces act___________________?
Show answer Hide answer
Answer: C. vertically upwards
Archimedes principle dictates that buoyant forces equal the displaced fluid weight acting upwards. The resultant normal pressure forces integrate to a single net upward force vector. This net vertical force acts directly...
Q3. In a petrol engine, specific fuel consumption drops initially and then rises with an increasing air-fuel ratio; within what range does the minimum occur__________________?
Show answer Hide answer
Answer: A. lean mixture
Specific fuel consumption measures the mass of fuel consumed per unit of power output produced by an internal combustion engine. As the air-fuel ratio increases from rich toward lean, combustion becomes more complete and...
Q4. How does steam temperature respond to an increasing load in boilers equipped with radiation superheaters________________?
Show answer Hide answer
Answer: B. decreases
Radiation superheaters experience a decrease in steam temperature as the boiler load increases. Fuel firing rate increases less proportionally than steam flow at higher loads, reducing radiant heat absorption per unit ma...
Q5. How does the specific volume of steam vary as pressure rises_____________________?
Show answer Hide answer
Answer: C. rapidly first and then slowly
At low saturation pressures, steam expands enormously, causing very rapid changes in specific volume. At higher pressures, the vapor molecules are densely packed, making volume changes much smaller. This non-linear relat...
Q6. At what temperature does ferromagnetic alpha iron transition into paramagnetic alpha iron _______________?
Show answer Hide answer
Answer: A. 770°C
Ferromagnetic alpha iron, or ferrite, maintains strong magnetic attraction at ambient and moderate industrial temperatures. When heated to approximately 770 degrees Celsius, thermal energy disrupts the alignment of atomi...