Hydraulics And Fluid Mechanics In Me - Study Mode
[#366] The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
Correct Answer
(D) 21,000
[#367] Head developed by a centrifugal pump depends on
Correct Answer
(D) Both (A) and (B) above
Explanation
Solution: Impeller Diameter (A): A larger impeller diameter means the fluid travels a greater distance while being pushed outwards. This results in a higher velocity of the fluid leaving the impeller and consequently, a higher head (pressure) developed. Speed (B): The faster the impeller rotates (higher speed), the more kinetic energy is imparted to the fluid. This increased kinetic energy translates into a higher velocity and a greater head being developed by the pump. Fluid Density (C): While fluid density does affect the power required to pump the fluid, it does not directly influence the head developed by a centrifugal pump for a given impeller diameter and speed. The head is primarily determined by the velocity imparted to the fluid. Therefore, the head developed by a centrifugal pump is directly related to both the impeller diameter and the speed of rotation .
[#368] If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm", the pressure at a depth of 50 m below the oil surface will be
Correct Answer
(D) 6 meters of water Column
[#369] The pressure in the air space above an oil (sp. gr. 0.8) surface in a tank is 0.1 kg/cm". The pressure at 2.5 m below the oil surface will be
Correct Answer
(B) 3 metres of water column
[#370] If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
Correct Answer
(C) Lower than the surface of liquid