Neil Revollo
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Distribution Piping Systems

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Neil Revollo
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Chapter 11 - Quiz

Question 1 of 20

1

A zone is any area of a building for which indoor air temperature is controlled by a single thermostat (or other type of temperature controller).

Select one of the following:

  • True
  • False

Explanation

Question 2 of 20

1

Different rooms within a single zone (e.g., controlled by a single thermostat) and supplied with the same water temperature cannot be maintained at different temperatures by adjusting the flow rate through individual heat emitters.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 20

1

If the heat emitters are connected in series , the system flow rate will pass through each heat emitter. If the heat emitters are connected in parallel, the flow rate through each heat emitter can be proportioned based on load using an equation.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 20

1

Given the surface area of their bodies, hydraulic separators should be insulated to minimize heat loss to their surroundings.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 20

1

Designers should think of hydraulic separation as a physical concept that must be accomplished as an all-or-nothing condition.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 20

1

When a circulator with the flat curve is used, the differential pressure across the circulator changes dramatically as zone circuits turn on and off.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 20

1

The electronically commutated motors and improved hydrodynamic design of current generation variable-speed pressure-regulated circulators provide wire-to-water efficiencies that are approximately double those of standard wet-rotor circulators with permanent split capacity.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 20

1

If a fixed-speed circulator is selected, a differential pressure bypass valve should be installed to reduce the potential for flow noise when only one or two zones are active.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 20

1

Over the last two decades, many heating professionals have come to recognize the failure of PEX and PEX-AL-PEX tubing as universal piping materials for residential and light commercial hydronic systems.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 20

1

Primary/secondary (P/S) piping is the only way to achieve hydraulic separation between simultaneously operating circulators.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 20

1

The time required to cool down or warm up a zone is significantly affected by the __________ of the heat emitter(s), and the building itself.

Select one of the following:

  • thermal envelope

  • thermal mass

  • ambient temperature

  • setpoint temperature

Explanation

Question 12 of 20

1

All hydronic systems, regardless of how they are designed or installed, attempt to simultaneously stabilize at two unique operating conditions called thermal equilibrium and __________ equilibrium.

Select one of the following:

  • spatial

  • hydraulic

  • zoning

  • R-value

Explanation

Question 13 of 20

1

In a technique known as __________, the designer repeatedly analyzes both the hydraulic and thermal performance of a system using "candidate" hardware options and operating conditions, until a combination is found that yields acceptable heat distribution.

Select one of the following:

  • trial and error

  • selective pairing

  • elimination

  • iteration

Explanation

Question 14 of 20

1

Ideally, each circulator in a system will establish a differential pressure and flow rates that is unaffected by the presence of another operating circulator within the system. This very desirable condition is called __________.

Select one of the following:

  • hydraulic equilibrium

  • hydraulic separation

  • the pump curve

  • ideal circulation

Explanation

Question 15 of 20

1

The degree to which two operating circulators interact with each other depends on the head loss of the piping path they have in common. This piping path is called the __________ piping.

Select one of the following:

  • circulatory

  • serpentine

  • head loss

  • common

Explanation

Question 16 of 20

1

The purpose of differential pressure bypass valves (DPBV) is to _________ the differential pressure imposed on the distribution system by a fixed-speed circulator as the system flow rate decreases due to closing zone valves.

Select one of the following:

  • accelerate

  • equalize

  • limit

  • increase

Explanation

Question 17 of 20

1

One approach that takes advantage of the flexibility of PEX or PEX-AL-PEX tubing is called a __________ distribution system.

Select one of the following:

  • hydroplastic

  • home run

  • hybrid

  • green

Explanation

Question 18 of 20

1

The closely spaced tees connecting a secondary circuit to the primary circuit are __________ when air is being purged from the system.

Select one of the following:

  • counterproductive

  • instrumental

  • essential

  • irrelevant

Explanation

Question 19 of 20

1

The concept of __________ provides a means by which the electrical energy consumption of a distribution system, per unit of heat delivery capacity, can be calculated and compared.

Select one of the following:

  • hydraulic separation

  • hydraulic equilibrium

  • thermal envelope

  • distribution efficiency

Explanation

Question 20 of 20

1

The diverse loads served by many modern residential and light commercial systems often dictate that the distribution system contains elements from __________ of the basic distribution systems discussed in this chapter.

Select one of the following:

  • one specific

  • two or more

  • at least three

  • possibly none

Explanation

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