NAPT Fluid Mechanics and Hydraulics 2

Question 1

Laminar flow occurs when the Reynolds number is approximately:

Accepted Answer

Less than 2,300

Answer

Greater than 4,000

Answer

Between 2,300 and 4,000

Answer

Exactly 1,000

Question 2

Absolute pressure is related to gauge pressure by:

Accepted Answer

Absolute = Gauge + Atmospheric

Answer

Absolute = Gauge − Atmospheric

Answer

Absolute = Gauge × Atmospheric

Answer

Absolute = Atmospheric − Gauge

Question 3

Cavitation in a hydraulic system occurs when:

Accepted Answer

Local fluid pressure drops below the vapor pressure of the fluid

Answer

Fluid temperature drops below freezing

Answer

Flow velocity decreases below a critical threshold

Answer

System pressure exceeds the pump rating

Question 4

The specific gravity of a fluid is defined as:

Accepted Answer

The ratio of its density to the density of water at 4°C

Answer

Its density in kg/m³

Answer

Its weight per unit volume in Newtons

Answer

The ratio of its pressure to atmospheric pressure

Question 5

Head pressure in fluid systems refers to:

Accepted Answer

The equivalent height of fluid column that produces a given pressure

Answer

The pressure at the pump inlet only

Answer

The maximum rated pressure of a hydraulic component

Answer

The dynamic pressure due to fluid velocity

Question 6

Which type of pump uses meshing gears to move fluid and is commonly found in hydraulic systems?

Accepted Answer

Gear pump

Answer

Centrifugal pump

Answer

Axial flow pump

Answer

Diaphragm pump

Question 7

The Reynolds number is calculated using which set of variables?

Accepted Answer

Velocity, pipe diameter, density, and dynamic viscosity

Answer

Pressure, density, and viscosity

Answer

Flow rate, pipe length, and fluid temperature

Answer

Surface tension, gravity, and fluid depth