ASCE Hydraulics and Fluid Mechanics 3

Question 1

The specific weight of water (γ) at standard conditions (68°F/20°C) is approximately:

Accepted Answer

62.4 lb/ft³ (9.81 kN/m³)

Answer

9.81 lb/ft³ (1.94 kN/m³)

Answer

1000 lb/ft³ (15.7 kN/m³)

Answer

32.2 lb/ft³ (5.05 kN/m³)

Question 2

The force exerted by a static fluid on a submerged flat surface acts at the:

Accepted Answer

Center of pressure, which is always at or below the centroid

Answer

Centroid of the submerged area

Answer

Top edge of the submerged surface

Answer

Midpoint of the fluid depth above the surface

Question 3

The Moody diagram is used to determine which parameter in the Darcy-Weisbach equation?

Accepted Answer

The Darcy-Weisbach friction factor (f)

Answer

The hydraulic radius

Answer

The kinematic viscosity of the fluid

Answer

The pipe flow velocity

Question 4

In the design of a spillway, the discharge coefficient (Cd) is used to account for:

Accepted Answer

Hydraulic losses and velocity of approach effects on actual flow

Answer

The unit weight of water over the spillway crest

Answer

The slope of the spillway chute downstream

Answer

Thermal stratification in the reservoir

Question 5

Which type of flow profile in open channels is classified as M1 (Mild slope, profile 1)?

Accepted Answer

Flow depth greater than normal depth on a mild slope

Answer

Flow depth less than critical depth on a mild slope

Answer

Flow depth between normal and critical depth on a mild slope

Answer

Flow depth equal to critical depth at all points

Question 6

The net positive suction head available (NPSHA) for a pump must be:

Accepted Answer

Greater than the net positive suction head required (NPSHR)

Answer

Equal to the net positive suction head required (NPSHR)

Answer

Less than the vapor pressure of the liquid

Answer

Independent of the suction pipe friction losses

Question 7

The orifice equation Q = Cd·A·√(2gh) relates flow through an orifice to:

Accepted Answer

The discharge coefficient, orifice area, and head above the orifice centerline

Answer

Pipe diameter, fluid density, and upstream Reynolds number

Answer

Wetted perimeter, channel slope, and Manning's n

Answer

Friction factor, pipe length, and velocity head