Deck 6: Fluid Flow in Piping

Question 1

The equivalent hydraulic resistance of an entire assembly is always greater than the smallest individual hydraulic resistance.

Answer 1

False

Question 2

Using pressure gauges to detect changes in the head of a liquid is like using thermometers to detect changes in the thermal energy content of that liquid.

Answer 2

True

Question 3

The static pressure at a given depth below the surface of a liquid remains exactly the same regardless of the diameter of the pipe.

Answer 3

True

Question 4

Flow velocity is a measurement of the volume of fluid that passes a given location in a pipe in a given time.

Question 5

The term "flow velocity" is commonly understood to mean the ____ flow velocity of the fluid as it moves through a pipe.

A) pressurized
B) average
C) maximum
D) minimum

Question 6

Copper tubing is also subject to a condition called ____, which can literally scrub metal off the inside wall of a tube or fittings.

A) thermal rusting
B) frictional pressure
C) flow rasping
D) erosion corrosion

Question 7

After the hydraulic resistances of all devices in a piping assembly are determined, they can be combined into a(n) ____ resistance similar to how electrical resistances are combined in circuit analysis.

A) equivalent
B) combined
C) calculated
D) average

Question 8

Whenever a fluid flows, an energy dissipating effect called ____ develops both within the fluid stream and along any surfaces the fluid contacts.

A) viscous friction
B) thermal reduction
C) anti-flow
D) pressure inhibition

Question 9

Each component in a piping assembly or circuit has an associated hydraulic resistance that defines its ability to dissipate thermal energy from the fluid at any given flow rate.

Question 10

A pipe size should be selected that keeps the average flow velocity between ____ ft./sec.

A) .5 and .75
B) 1 and 2
C) 1 and 3
D) 2 and 4

Question 11

The piping paths that share common points of connection are said to be piped ____.

A) in parallel
B) in series
C) equivalently
D) co-operatively

Question 12

Use of pressure drop charts based on 60° F water will consistently overestimate the pressure drop in hydronic piping circuits because the water will usually be at higher temperatures.

Question 13

Fluids in a hydronic system contain both thermal and mechanical energy.The mechanical energy, or ____, present in a fluid depends on several factors including its pressure, density, elevation, and velocity at some point in the system.

A) flow
B) compression
C) head
D) pressure

Question 14

The simplest piping assemblies are formed by connecting piping components end to end.In some cases, the collection of tubing, fittings, valves, and other components closes on itself to form a ____.

A) multi-resistor system
B) radiant loop
C) series circuit
D) thermal compound

Question 15

Every piping system should be thought of as having an operating cost as well as an installation cost.

Question 16

In a purely technical sense, the word fluid can mean either a liquid, such as water, or a gas, such as air.

Question 17

The equivalent length of a component is the amount of tubing, of the same pipe size, that would produce the same head loss (or pressure drop), as the actual component, at the same flow rate.

Question 18

____ represents the relationship between flow rate and head loss for a given piping circuit using a specific fluid at a given temperature.

A) System heat loss coordination
B) System head loss curve
C) System flow equation
D) System flow/loss calculation

Question 19

A more efficient method can be used in the common situation where the piping circuit contains a(n) ____ of pipe, fittings, and valves.

A) wide variety
B) single size
C) industry standard amount
D) user maintainable

Question 20

Determining the flow rates in systems with several parallel branches does not require "number crunching."