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Consider the following statements pertaining to centrifugal pumps: 1. The inlet to the impeller of a centrifugal pump is always axial, while the outlet may be radial or inclined. 2. The impeller may be shrouded on both sides with an eye at the center and vanes curved backward. 3. Impeller of double-entry type has a balanced radial thrust. 4. Un-shrouded and part-shrouded impeller are used only where high efficiency is unimportant. Which of these statements are correct?
For centrifugal pump impeller, the maximum value of the vane exit angle is
The optimum value of vane exit angle for a centrifugal pump impeller is
Consider a centrifugal pump having a specific impeller diameter, fixed impeller speed pumping a liquid of constant density at a particular discharge capacity. With decrease in the capacity of the pump, the __________ decreases.
S1:This weather-vane often tops a church spire, tower or high building.
P :They are only wind-vanes.
Q :Neither alone can tell us what the weather will be.
R :They are designed to point to direction from which the wind is coming.
S :Just as the barometer only tells us the pressure of air, the weather-vane tells us the direction of wind.
S6:The weather-vane can, however give us some indication of other.

The Proper sequence should be:
A centrifugal pump which circulates a hot liquid metal at 500 degree Celsius is driven by a 3600 rpm electric motor. The motor is coupled to the pump impeller by a horizontal steel shaft of dia 25 mm. Let us assume the motor temperature as 60 degree Celsius with the ambient air at 25 degree Celsius, what length of shaft should be specified between the motor and the pump? It may be presumed that the thermal conductivity of the shaft material is 35W/m K and that the convective film coefficient between the steel shaft and the ambient air is 15.7W/square m K
The figure given below shows the relationship between power (P) and discharge (Q) for different vane exit angels of centrifugal pump. In the figure given below, curve C holds good for.
Consider the following statements in connection with hydraulic turbines: 1. The Kaplan turbine is a radial flow turbine in which the guide vane angles as well as the runner vane angles are adjustable. 2. Francis and Kaplan turbines are provided with draft tubes which carry water from exit of runner to tail water to increase the gross head across the turbine. 3. The parts of turbines susceptible to cavitation are the guide vanes and runner vanes – drastically reducing the turbine efficiency. 4. The specific speed of a 4-jet Pelton turbine will be 28 if the specific speed of a single-jet Pelton turbine is 14. Which of the above statements are correct?
Discharge (Q) of a centrifugal pump is given by (where D = Diameter of impeller at inlet, b = Width of impeller at inlet, and Vf = Velocity of flow at inlet)
N.P.S.H. requirements could be _________ by utilizing an inducer, a low head, axial flow impeller utilized in front of the impeller of a centrifugal pump.