Chapter 9 - Quiz

Question 1 of 20

1

For current-generation hydronic heating systems, the controlled variable is usually indoor air temperature.

Select one of the following:

True
False

Explanation

Question 2 of 20

1

Most of the closed-loop control systems used for hydronic heating continually seek to eliminate any error that exists between the target value and measured value of the controlled variable.

Select one of the following:

True
False

Explanation

Question 3 of 20

1

Heat output from the heat emitter occurs whenever the supply water temperature equals the room air temperature.

Select one of the following:

True
False

Explanation

Question 4 of 20

1

The combination of near-continuous circulation and very gradual changes in water temperature tends to maximize expansion noises from the distribution piping and heat emitters.

Select one of the following:

True
False

Explanation

Question 5 of 20

1

Most heat source reset controllers have an adjustable minimum supply temperature.

Select one of the following:

True
False

Explanation

Question 6 of 20

1

Relay contacts are designated as normally open, or normally closed. In this context, the word "normally" means when the coil of the relay is not energized.

Select one of the following:

True
False

Explanation

Question 7 of 20

1

There are hydronic heating applications where control action is required based on the difference between two temperatures rather than the value of either temperature.

Select one of the following:

True
False

Explanation

Question 8 of 20

1

A multizone relay center is designed to isolate the wiring and control operation of several independent zone circulators or zone valves.

Select one of the following:

True
False

Explanation

Question 9 of 20

1

One purpose of mixing is to protect conventional boilers from operating at conditions that allow sustained flue gas condensation.

Select one of the following:

True
False

Explanation

Question 10 of 20

1

Direct injection mixing, whether accomplished using a two-way valve or variable-speed pump as the injection control device, provides the highest temperature difference between the supply and return injection risers.

Select one of the following:

True
False

Explanation

Question 11 of 20

1

The proper documentation of control systems is essential if they are to be expediently serviced in the future. A universally accepted tool for such documentation is the __________.

Select one of the following:

microprocessor
ladder diagram
designer spreadsheet
flow chart

Explanation

Question 12 of 20

1

The term __________ differential refers to the actual variation in the controlled variable as the system operates.

Select one of the following:

control
modulating
operating
real-time

Explanation

Question 13 of 20

1

To provide accurate control under low-load conditions, the controlled device must be able to maintain stable flow at very low flow rates. Such a device is said to have good __________.

Select one of the following:

modulation
variability
machining
rangeability

Explanation

Question 14 of 20

1

As outdoor temperature increases, and the heating load decreases, the water temperature supplied to the heat emitters also decreases as does their heat output. This concept is called outdoor __________ control.

Select one of the following:

temperature
variable
proportional
reset

Explanation

Question 15 of 20

1

Switches and relays are classified according to their poles and throws. The number of __________ is the number of independent and simultaneous electrical paths through the switch.

Select one of the following:

poles
throws
contacts
wires

Explanation

Question 16 of 20

1

__________ control is a planned strategy for shedding (e.g., temporarily turning off) one or more loads when a specific condition is detected in the system.

Select one of the following:

Error
Priority
Systemic
Conditional

Explanation

Question 17 of 20

1

In addition to equal run time rotation, there are other operating options available for staged/modulating heat sources. They are called series staging/modulation, parallel staging/modulation, and __________ staging/modulation.

Select one of the following:

proportional
on/off
multiple
hybrid

Explanation

Question 18 of 20

1

Boiler protection is accomplished by __________ the rate of heat flow from the boiler into the distribution system whenever the boiler temperature approaches or falls below a specified minimum operating temperature.

Select one of the following:

reducing
resetting
increasing
stabilizing

Explanation

Question 19 of 20

1

The term injection mixing applies to any mixing assembly in which __________ is pushed (e.g., injected) into a circulating distribution system.

Select one of the following:

coolant
air
hot water
mercury

Explanation

Question 20 of 20

1

A network control system without Internet access requires a person to be present to interrogate or adjust the system. This is unnecessary with a(n) __________ networked control system.

Select one of the following:

Web-enabled
electronic
electromechanical
fuzzy logic

	Created by Neil Revollo about 8 years ago

Control Strategies, Components, and Systems

Chapter 9 - Quiz

Question 1 of 20

For current-generation hydronic heating systems, the controlled variable is usually indoor air temperature.

Select one of the following:

Explanation

Question 2 of 20

Most of the closed-loop control systems used for hydronic heating continually seek to eliminate any error that exists between the target value and measured value of the controlled variable.

Select one of the following:

Explanation

Question 3 of 20

Heat output from the heat emitter occurs whenever the supply water temperature equals the room air temperature.

Select one of the following:

Explanation

Question 4 of 20

The combination of near-continuous circulation and very gradual changes in water temperature tends to maximize expansion noises from the distribution piping and heat emitters.

Select one of the following:

Explanation

Question 5 of 20

Most heat source reset controllers have an adjustable minimum supply temperature.

Select one of the following:

Explanation

Question 6 of 20

Relay contacts are designated as normally open, or normally closed. In this context, the word "normally" means when the coil of the relay is not energized.

Select one of the following:

Explanation

Question 7 of 20

There are hydronic heating applications where control action is required based on the difference between two temperatures rather than the value of either temperature.

Select one of the following:

Explanation

Question 8 of 20

A multizone relay center is designed to isolate the wiring and control operation of several independent zone circulators or zone valves.

Select one of the following:

Explanation

Question 9 of 20

One purpose of mixing is to protect conventional boilers from operating at conditions that allow sustained flue gas condensation.

Select one of the following:

Explanation

Question 10 of 20

Direct injection mixing, whether accomplished using a two-way valve or variable-speed pump as the injection control device, provides the highest temperature difference between the supply and return injection risers.

Select one of the following:

Explanation

Question 11 of 20

The proper documentation of control systems is essential if they are to be expediently serviced in the future. A universally accepted tool for such documentation is the __________.

Select one of the following:

Explanation

Question 12 of 20

The term __________ differential refers to the actual variation in the controlled variable as the system operates.

Select one of the following:

Explanation

Question 13 of 20

To provide accurate control under low-load conditions, the controlled device must be able to maintain stable flow at very low flow rates. Such a device is said to have good __________.

Select one of the following:

Explanation

Question 14 of 20

As outdoor temperature increases, and the heating load decreases, the water temperature supplied to the heat emitters also decreases as does their heat output. This concept is called outdoor __________ control.

Select one of the following:

Explanation

Question 15 of 20

Switches and relays are classified according to their poles and throws. The number of __________ is the number of independent and simultaneous electrical paths through the switch.

Select one of the following:

Explanation

Question 16 of 20

__________ control is a planned strategy for shedding (e.g., temporarily turning off) one or more loads when a specific condition is detected in the system.

Select one of the following:

Explanation

Question 17 of 20

In addition to equal run time rotation, there are other operating options available for staged/modulating heat sources. They are called series staging/modulation, parallel staging/modulation, and __________ staging/modulation.

Select one of the following:

Explanation

Question 18 of 20

Boiler protection is accomplished by __________ the rate of heat flow from the boiler into the distribution system whenever the boiler temperature approaches or falls below a specified minimum operating temperature.

Select one of the following:

Explanation

Question 19 of 20

The term injection mixing applies to any mixing assembly in which __________ is pushed (e.g., injected) into a circulating distribution system.

Select one of the following:

Explanation

Question 20 of 20

A network control system without Internet access requires a person to be present to interrogate or adjust the system. This is unnecessary with a(n) __________ networked control system.