Steam And Hot Water Heating Review

Question 1

What is the energy required to raise the temperature of a liquid without changing its state known as?

Answer 1

Sensible heat

Question 2

What are the two variables which are shown on a pump curve?

Answer 2

Flow in US gallons per minute and pressure in feet and head

Question 3

If an in slab radiant heating system is required to produce for 45650 BTUs per hour with a temperature drop of 20°F. What would be the required flow rate through the tubing in the floor?

Answer 3

4.57 gallons per minute

Question 4

What is the temperature of the air surrounding the equipment known as?

Answer 4

Ambient temperature

Question 5

What is the term given to the flow of air or combustion products or both through an appliance and it’s venting system if it is unassisted by a fan?

Answer 5

Natural draft

Question 6

British thermal unit is defined as the amount of heat required to what

Answer 6

Raise lower the temperature of 1 pound of water 1°F

Question 7

What temperature and pressure are low temperature cast iron boilers limited to

Answer 7

250°F and 30 psi G

Question 8

What are the most common materials for boiler construction?

Answer 8

Cast-iron, copper and steel

Question 9

What are the most newer boilers that allow for gas to condense constructed of?

Answer 9

Stainless steel

Question 10

Which type of boiler can be dismantled to allow it to fit into a boiler rooms through normal doors

Answer 10

Cast-iron

Question 11

What is the name given to the control that shuts down the boilers energy source when temperature in the boiler rises above the normal operating temperature

Answer 11

High limit

Question 12

What are boilers with very little water content called

Answer 12

Low thermal mass boilers

Question 13

Which one of the following is defined as boiler input?
A. the amount of energy consumed by the heat transfer units

B.The amount of energy consumed by the transmission losses

C.The amount of energy consumed by the boiler

D.The amount of energy loss through stack and jacket losses

Answer 13

C. the amount of energy consumed by the boiler

Question 14

Which one of the following could be classified as a high mass boiler?
A. Copper tube boiler.
B. Steel water tube boiler.
C. Copper tub boiler used for domestic water heating
D. Cast-iron sectional boiler.

Answer 14

D. Cast iron sectional boiler

Question 15

Which of these hot water boilers can be used to heat domestic water.
A. Cast-iron sectional.
B. Steel fire tube.
C. Cast-iron condensing.
D. Copper tube.

Answer 15

D. Copper tube.

Question 16

What is the purpose of a boiler operating control?

Answer 16

To control the normal temperature range of the boiler

Question 17

What devices required on a low mass boiler over 400,000 BTUs

Answer 17

Flow control valve

Question 18

What device compensate for the normal expansion and contraction of the water in the system

Answer 18

Diaphragm tank

Question 19

What device is used to maintain a minimum pressure with an system

Answer 19

Pressure reducing valve

Question 20

What is the name of the piping system in which the heating transfer units are part of the piping main

Answer 20

One pipe series loop

Question 21

What is the name of the piping system in which the first heat transfer unit supplied is also the first return returned

Answer 21

Two pipe direct return

Question 22

What is the purpose of a balancing valve?

Answer 22

To adjust flow rates to each heat transfer unit

Question 23

What is the purpose of a “wild loop“

Answer 23

To prevent the pump from deadheading

Question 24

What is the purpose of a zone valve?

Answer 24

To allow control of heat in different sections of a heating system

Question 25

What are the preliminary considerations when locating air removal devices?

Answer 25

Temperature and pressure

Question 26

Why is it important to remove gases from the water in a hot water system?

Answer 26

To prevent air binding in the system

Question 27

Where should you locate air vents?

Answer 27

At all high points of the system

Question 28

What part of a circulator transfers energy to the water

Answer 28

The impeller

Question 29

What functions does a circulator provide in a hot water heating system?

Answer 29

It moves water within the system

Question 30

What is considered the best location for a circulator?

Answer 30

Downstream from the compression tank

Question 31

What causes conventional currents

Answer 31

Different fluid densities

Question 32

What method of heat transfer is utilized by a brazed plate heat exchanger

Answer 32

Conduction

Question 33

Which of the following is a trim item which would never be seen as a steam boiler? Low water cut off Pressure relief valve Diaphragm tank Automatic water feeder

Answer 33

Diaphragm tank

Question 34

Where is in floor radiant heating not install installed

Answer 34

Under cabinetS

Question 35

How is find tube baseboard rated?

Answer 35

BTU per foot per hour based upon supply water temperature, flow rate and entrance air temperature of 65°F

Question 36

What length of fin would be required for a room with a heat loss of 11,000 BTUs per hour if the Finn had an I will put rating of 550 BTU per feet per hour

Answer 36

20 feet

Question 37

What is a way of reducing noise in a chilled water system?

Answer 37

Insulate the piping

Question 38

When installing heating runs in joint space run the tubing how

Answer 38

To the farthest point then provide coverage on the return

Question 39

The pressure relief valve on a boiler is leaking. What is the culprit?

Answer 39

Waterlogged expansion tank

Question 40

What is a consideration when sizing an expansion tank

Answer 40

Working temperature

Question 41

A mixed heating system is operating too hot. What is the best way of fixing it

Answer 41

Adjust the mixing valve

Question 42

What are the required fittings to properly isolate a heating/cooling emitter

Answer 42

Isolation valves, unions and air vents

Question 43

How is the water added to a cooling tower

Answer 43

Through an RPA and an air gap

Question 44

An up fed gas supply to a unit heater requires what

Answer 44

Shut off and a union

Question 45

What is the direction of unit heater should face when installed in a garage with an overhead door

Answer 45

Down toward the door from above and beside the door

Question 46

When installing a chiller, spring isolators would be used for

Answer 46

Vibration dampening

Question 47

The cushion tank in a hydronic heating system must be sized to allow for approximately what percent of water expansion

Answer 47

4% of expansion of water

Question 48

What is a cooling tower associated with?

Answer 48

A commercial building with a chilled water system

Question 49

What is the purpose of a pot feeder on a hot water heating system?

Answer 49

To prevent corrosion of the system components

Question 50

Where would type H copper tube be used?

Answer 50

Hydronic heating baseboard tubing

Question 51

The best location for an air scoop on a cooling system is the area of

Answer 51

Lowest pressure and highest temperature

Question 52

Where is the fan placed in relation to a cooling coil?

Answer 52

Upstream of the coil

Question 53

What would be the cause of a low mass boiler making noise during operation?

Answer 53

A low velocity of system fluid

Question 54

Large high amateur draw electric motors are typically what phase

Answer 54

Three phase motors

Question 55

What must be checked after a three phase pump is installed in a hot water heating system

Answer 55

The rotation of the pump

Question 56

A hot water heating system has three zones. Two of the zones are working fine, but when the third zone valve opens, the circulator does not start and the burners do not fire what is most likely the cause

Answer 56

A faulty end switch

Question 57

What part would need replacement if a pump was leaking between the motor shaft and the pump body?

Answer 57

The mechanical seal

Question 58

Where is the best location for hydronic heating baseboard wallfin

Answer 58

On the outside wall under your window

Question 59

Chrillers typically have what type of piping connections

Answer 59

Flange

Question 60

If a cooling coil is installed in a ducting system, what else would be required?

Answer 60

Access for servicing and condensate drain

Question 61

What is the purpose of an outdoor reset control

Answer 61

It reads the outdoor temperature and adjust the system water temperature automatically

Question 62

When are supplemental heating units installed in conjunction with radiant floor heating systems

Answer 62

When the radiant system can’t keep up with the heat loss

Question 63

👺How should a float switch be wired to a pump supplying water to a cooling tower?👺

Answer 63

In series with an upstream of the pump

Question 64

When replacing an electric boiler with a gas fire boiler what components would be necessary to add

Answer 64

An air supply

Question 65

What would be the most important as a consideration when determining the location of a boiler

Answer 65

The venting route

Question 66

Where should a flow switch be located on a hydronic heating system?

Answer 66

On the boiler supply

Question 67

How was the water level maintained in a cooling tower?

Answer 67

By a float operated valve

Question 68

Where should a low water cut off Be installed for a water boiler

Answer 68

2 feet above the top of the boiler

Question 69

What is the minimum rating for a relief valve on a boiler?

Answer 69

100% of the rating input

Question 70

What is used to minimize vibration for a cooling tower to the building structure?

Answer 70

A spring loaded isolator

Question 71

What type of backflow preventer would be used on a make up water chiller?

Answer 71

RPBA

Question 72

What is the minimum recommended backflow protection for a cold water make up line to a boiler system that uses 50% water to 50% glycol mixture

Answer 72

RPBA

Question 73

What hot water heating system is easiest for flow balancing

Answer 73

2 pipe Reverse return

Question 74

Which of the following would not be important consideration when determining the placement of a boiler Venting location Floor drain Terminations Visibility from street

Answer 74

Visibility from the street

Question 75

Which piece of equipment must be installed if a space heating boiler is to be used to heat domestic water

Answer 75

Heat exchanger

Question 76

What would be the correct equipment to be installed on a heat transfer unit?

Answer 76

Ball valve, a globe valve, two unions, a vent and a drain

Question 77

What will be installed between a cooling fan coil and a fixed piping which is attached to the building structure?

Answer 77

Isolation and balancing valves and a flex connecter with unions

Question 78

What is necessary to be installed on a supply and return piping to a chiller that is mounted on rubber isolation pads

Answer 78

Flex connecters

Question 79

Where would the flow switch be installed in the hydronic heating system used on a low mass boiler?

Answer 79

On the supply piping from the boiler

Question 80

The purpose of a high limit on a boiler is to

Answer 80

Ensure the boilers safe operating temperature is not exceeded

Question 81

What is usually used to prove water circulation through a high mass boiler before the main ignites

Answer 81

Nothing

Question 82

How is the water level maintained in a reservoir cooling tower?

Answer 82

By a float switch

Question 83

When pouring concrete onto a radiant slab on grade floor panel what must be done

Answer 83

Maintain pressure in the pipe

Question 84

Where would low water cut off on a steam boiler system?

Answer 84

At the minimum safe water level of boiler

Question 85

What would be the probable cause of a relief valve on an RP discharging intermittently?

Answer 85

Upstream pressure fluctuations

Question 86

What could be the result of calcium buildup in a boiler?

Answer 86

Flow restrictions, reduced heat transfer, higher fuel bills

Question 87

What should be checked first if one zone of a radiant heated house wasn’t getting heat

Answer 87

The zone valve motor

Question 88

How is a steam main installed in a system?

Answer 88

Graded down and away from the boiler at 1 inch/20 feet Supply is graded down and away from boiler to drain codencate goes AWAY from boiler

Question 89

On what principle does a float trap in a steam system work

Answer 89

The difference in densities between the condensate and the steam

Question 90

How does a mechanical steam trap operate?

Answer 90

Senses is the difference in densities between water and steam

Question 91

Low pressure steam boiler has an operating pressure set at five psi G below the maximum allowed by the A.S.M.E code the pressure control has a differential of four psi G what is the cut in and cut out pressure?

Answer 91

Six PSig

Question 92

How are the different gasket rings used in a grooves identified in a piping system

Answer 92

By their colour

Question 93

What is the minimum size blowdown of a steam boiler?

Answer 93

Three-quarter inch

Question 94

What would be the flow rate for a hydronic heating zone that has a heat loss of 45,000 BTUH and will have a temperature differential of 10°F

Answer 94

Nine US gallons per minute

Question 95

A boiler was operating at 15 psi G but is now down to seven psi G what should be the first thing to be checked

Answer 95

The pressure relief valve

Question 96

This control used on a hot water heating system. Adjust the boiler water temperature by measuring the outside air temperature.

Answer 96

Outdoor reset control

Question 97

This valve can modulate water temperature in hydraulic heating systems

Answer 97

Mixing valve

Question 98

Where is the heating/cooling coil located in a relation to the fan of a fan coil?

Answer 98

Down stream

Question 99

Two low mass boilers have a common make up water feed, what is required

Answer 99

Isolating valves, union, and air vents