i.The spin rate of a pump increases by a factor of 2. Under these conditions, its Power output increases by a factor of 4 b. Power output increases by a

factor of 8 c. Volume flow rate increases by a factor of 2 d. Volume flow rate increases by a factor of 4 ii.The principles of working behind axial flow pumps is: a. Poiseuille law b. Generation of lift-force in airfoil shapes c. Surface tension d. Downwash generated by airfoil shapes iii.In a well-designed propeller, the blade angle at the root is higher than that at the tip because a good design requires the angle of attack to be the same at any radial location b. a good design requires the angle of attack to be variable at all radial locations so that the amount of thrust can be controlled.c. the tangential speed of the blade increases with radius d. the relative velocity of the fluid with respect to the blades is identical to the absolute velocity of the fluid. iv.A combination of rotors and stators is designed in axial flow turbo machines so that: a. The incoming fluid has no turbulence b. The outgoing fluid has lower axial velocities c. The swirl introduced by one is cancelled by the other d. The outgoing fluid has no swirl v.The power coefficient and head coefficients for a turbine operation are 9216 and 16,respectively. Which type of turbine(s) would you recommend for this application a. Positive displacement turbine. b. Francis turbine. c. Kaplan turbine. d. Propeller type turbine. vi.Which of the following are true about Rayleigh flow: a. The entropy may decrease with heating. b. The temperature always increases with heating. c. The stagnation temperature always increases with heating. d. The product of density and velocities remains constant. vii.For isentropic compressible flow which of the following are true a. When a fluid is brought to rest, its temperature decreases b. When a fluid is brought to rest, its temperature increases c. Across all states the product p^k-1. T^-1 remains constant d. Across all states the product p^k-1.T remains constant Which of the following quantities encountered in Compressible flow are dimensionless (symbols have their usual meaning):viii. а. Ма b. k с. Ср d. p*RT* ix.In a converging-diverging nozzle, it is found that the flow is sonic at the throat. What can be said about the flow at the exit of the diverging section: a. It could be supersonic b. It could be subsonic c. It is necessarily supersonic d. It is necessarily subsonic х.Consider two identical converging-diverging nozzles with different gases (properties denoted by subscripts 1 and 2). The in let flow conditions are identical for the two nozzles. The gas constant in the first nozzle is k, = k while that in the second is k, =2k. Which of the following are true? \text { a. } \frac{T_{1}^{*}}{T_{2}^{*}}=\frac{2 k+1}{k+1} \text { b. } \frac{T_{1}^{*}}{T_{2}^{*}}=\frac{k+1}{2 k+1} \text { c. } \frac{P_{1}^{*}}{P_{2}^{*}}=\left(\frac{2}{k+1}\right)^{\frac{k}{k-1}}\left(\frac{2}{2 k+1}\right)^{\frac{-2 k}{2 k-1}} \text { d. } \frac{P_{1}^{*}}{P_{2}^{*}}=\left(\frac{2}{2 k+1}\right)^{\frac{k}{k-1}}\left(\frac{2 k}{k+1}\right)^{\frac{2 k}{2 k-1}}