A. Less power than
B. More power than
C. Same power as
D. Data insufficient to predict

742. Which of the fluid forces are not considered in the Reynold’s equation of flow ?
A. Viscous forces
B. Turbulent forces
C. Pressure forces
D. Compressibility forces

743. Rotary vacuum pumps can reduce the absolute pressure to as low as __________ mm Hg ?
A. 1
B. 0.1
C. 0.01
D. 0.001

744. A mono pump is a __________ pump ?
A. Centrifugal
B. Piston
C. Positive acting rotary
D. A group of vacuum

745. For a given Reynold number as d/D for an orifice increases, Cd will (where, d & D are orifice & pipe diameters respectively)?
A. Increase
B. Decrease
C. Remain constant
D. Either A. or B.; depends on other factors

746. Which of the following pipe bends will incur the largest head loss ?
A. U-bend
B. 30° bend
C. 45° bend
D. 90° bend

747. Pick out the Hagen-Poiseuille‟s equation ?
A. Δp/ρ = 4f (L/D) (V2/2gc)
B. Δp = 32 (μLV/gc. D2)
C. Δp/L = 150 [(1 – ε)/ε3]. (μ.V0
2/g2cD)
D. Δp/L = 1.75 [(1 – ε)/ε3]. (ρV0
2/gcDp)

748. Which of the following quantities are computed by using the hydraulic radius for noncircular ducts ?
A. Velocity and relative roughness