Hydronics

Question 1

What are the three functions of a triple duty valve?

Answer 1

Pressure reducing, check valve, balance in valve

Question 2

What are three devices that would be included in a makeup water system?

Answer 2

Prv, backflow preventer, isolation valve

Question 3

What does lwco stand for?

Answer 3

Low water caught off

Question 4

How many BTUs are required to heat one pound of water from 32° to 212° f?

Answer 4

180

Question 5

How many BTUs are required to change 1 lb of water at 212° f to steam?

Answer 5

970

Question 6

What valve would you choose to regulate flow through a coil?

Answer 6

Pressure reducing valve

Question 7

What device is used to protect potable water systems from cross-contamination?

Answer 7

Backflow preventer

Question 8

What device protects the boiler from pressure above maximum design pressure?

Answer 8

Pressure relief valve

Question 9

What does asme boiler code require if the output of a boiler is 400,000 BTU or more?

Answer 9

Low water cutoff

Question 10

The BTU rating of a boiler is how much heat the boiler will create and how long?

Answer 10

1 hour

Question 11

When a heat pump is in heating mode what is the operating mode of the outdoor device?

Answer 11

Evaporator

Question 12

In a coil what type of flow has the best heat transfer?

Answer 12

Counterflow

Question 13

True or false. You need 10 pipe diameters of straight pipe between the y strainer and the suction for the pump.

Answer 13

False

Question 14

When connecting the makeup water fill line, what is the best location for installation?

Answer 14

Point of no pressure change

Question 15

When a pump is subject to a lift what must be done to the pump before you start the motor?

Answer 15

Prime it

Question 16

Which term describes a hydronic system that is sealed to prevent entrance of air from the atmosphere?

Answer 16

Closed

Question 17

Why is glycol not used at 100% concentration?

Answer 17

Viscosity is too high

Question 18

Which pump is used most often for a closed hydronic piping system

Answer 18

Centrifugal

Question 19

In a primary - secondary pumping arrangement where is the largest circulator installed?

Answer 19

Primary

Question 20

Where would you install a triple duty valve

Answer 20

Discharge of the pump

Question 21

What is the maximum spacing recommended for the closely space tees on a primary - secondary system?

Answer 21

Four pipe diameters

Question 22

What are the two types of pump misalignment that must be checked?

Answer 22

Angular and parallel

Question 23

What is the violent action of vapor bubbles in a centrifugal pump?

Answer 23

Cavitation

Question 24

What is the maximum theoretical lift of a pump?

Answer 24

34 ft of head

Question 25

If you are going to convert PSI to foot head what is the equation that you would use, and if you were going to convert foot head to psi what equation would you do.

Answer 25

Psi to ft of head = x.433 | Ft of head to psi = x2.32

Question 26

Which piping system is identified by first supplied last to connect in the return?

Answer 26

Direct return

Question 27

Which system has separate heating and cooling functions with dedicated supply and return piping?

Answer 27

For pipe

Question 28

Which piping designs are two pipe systems?

Answer 28

Direct return and reverse return

Question 29

Which type of hydronic system would use gravity flow

Answer 29

Low temperature heating

Question 30

Brian or water/glycol mixture is commonly referred to as?

Answer 30

HTF

Question 31

In order to provide accurate indoor temperatures the heat supply to the building must be equal to?

Answer 31

Heat loss of the building

Question 32

What are the four types of heat transfer?

Answer 32

Conduction, convection, radiation, evaporation

Question 33

Which type of heat, when added or removed from a substance creates a change of state?

Answer 33

Latent heat

Question 34

Define humidity

Answer 34

The amount of moisture in the air

Question 35

What is dry bowl temperature?

Answer 35

Temperature of air taken with a standard thermometer

Question 36

How is rate of flow measured?

Answer 36

Gallons per minute

Question 37

Which tool is used to determine relative humidity?

Answer 37

Sling psychometer

Question 38

Which heat transfer describes the condition when a body loses heat to cooler surfaces?

Answer 38

Radiation

Question 39

Pressure, according to the height of a liquid is called?

Answer 39

Static head

Question 40

What is atmospheric pressure at sea level?

Answer 40

14.7 psia

Question 41

Temperature comfort is accomplished by controlling

Answer 41

Temperature and humidity

Question 42

Describe enthalpy

Answer 42

Total amount of energy of a substance

Question 43

What is another term for pump capacity?

Answer 43

Head pressure

Question 44

Evaporation occurs when water absorbs _____ heat

Answer 44

Latent

Question 45

What is maximum design pressure for a low temperature boiler?

Answer 45

160 PSIG

Question 46

A condenser acts as a type of?

Answer 46

Heat exchanger

Question 47

Low pressure boilers are classified by?

Answer 47

15 PSIG steam and 160 PSIG water

Question 48

Which type of device is attached to a boiler to assist in the management of air in a hydronic system?

Answer 48

Boiler fitting

Question 49

Which impeller is most efficient for pumping clear liquids?

Answer 49

Vane and pedal

Question 50

which term describes an impeller that has vanes attached to a hub that is not enclosed or supported by a shroud on either side?

Answer 50

Open impeller

Question 51

The best place for air separation is at the boiler why?

Answer 51

HTF is at a high temperature and low velocity

Question 52

A typical pressure at the top of a hydronic system with the pumps off would be?

Answer 52

4 PSIG

Question 53

Select three ways air can exist within a hydronic system?

Answer 53

Air pockets, entrained air bubbles, dissolved gases

Question 54

Which flow rate is best for air removal?

Answer 54

2 fps

Question 55

A properly installed closed loop hydronic system that has been filled and properly maintained, needs ______ additional HTF

Answer 55

Rarely

Question 56

2 types of 1 pipe systems

Answer 56

Series loop and single main