Chapter 9 - Quiz

Questão 1 de 20

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 2 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 3 de 20

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 4 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 5 de 20

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 6 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 7 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 8 de 20

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 9 de 20

1

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

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 10 de 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.

Selecione uma das opções:

VERDADEIRO
FALSO

Explicação

Questão 11 de 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 __________.

Selecione uma das seguintes:

microprocessor
ladder diagram
designer spreadsheet
flow chart

Explicação

Questão 12 de 20

1

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

Selecione uma das seguintes:

control
modulating
operating
real-time

Explicação

Questão 13 de 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 __________.

Selecione uma das seguintes:

modulation
variability
machining
rangeability

Explicação

Questão 14 de 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.

Selecione uma das seguintes:

temperature
variable
proportional
reset

Explicação

Questão 15 de 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.

Selecione uma das seguintes:

poles
throws
contacts
wires

Explicação

Questão 16 de 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.

Selecione uma das seguintes:

Error
Priority
Systemic
Conditional

Explicação

Questão 17 de 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.

Selecione uma das seguintes:

proportional
on/off
multiple
hybrid

Explicação

Questão 18 de 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.

Selecione uma das seguintes:

reducing
resetting
increasing
stabilizing

Explicação

Questão 19 de 20

1

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

Selecione uma das seguintes:

coolant
air
hot water
mercury

Explicação

Questão 20 de 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.

Selecione uma das seguintes:

Web-enabled
electronic
electromechanical
fuzzy logic

	Criado por Neil Revollo aproximadamente 8 anos atrás

Control Strategies, Components, and Systems

Chapter 9 - Quiz

Questão 1 de 20

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

Selecione uma das opções:

Explicação

Questão 2 de 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.

Selecione uma das opções:

Explicação

Questão 3 de 20

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

Selecione uma das opções:

Explicação

Questão 4 de 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.

Selecione uma das opções:

Explicação

Questão 5 de 20

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

Selecione uma das opções:

Explicação

Questão 6 de 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.

Selecione uma das opções:

Explicação

Questão 7 de 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.

Selecione uma das opções:

Explicação

Questão 8 de 20

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

Selecione uma das opções:

Explicação

Questão 9 de 20

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

Selecione uma das opções:

Explicação

Questão 10 de 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.

Selecione uma das opções:

Explicação

Questão 11 de 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 __________.

Selecione uma das seguintes:

Explicação

Questão 12 de 20

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

Selecione uma das seguintes:

Explicação

Questão 13 de 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 __________.

Selecione uma das seguintes:

Explicação

Questão 14 de 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.

Selecione uma das seguintes:

Explicação

Questão 15 de 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.

Selecione uma das seguintes:

Explicação

Questão 16 de 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.

Selecione uma das seguintes:

Explicação

Questão 17 de 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.

Selecione uma das seguintes:

Explicação

Questão 18 de 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.

Selecione uma das seguintes:

Explicação

Questão 19 de 20

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

Selecione uma das seguintes:

Explicação

Questão 20 de 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.