12095803
Descripción
Test por Kaitlyn Hickey, actualizado hace más de 1 año
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Creado por Kaitlyn Hickey
hace más de 8 años
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Pregunta 1
Pregunta
Which schematic diagram represents a heating thermostat?
Respuesta
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NC temperature-actuated switch
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NO temperature-actuated
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NC liquid level-actuated switch
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NO liquid level-actuated switch
Pregunta 2
Pregunta
What are the two types of electrical diagrams used in the heating and cooling industry?
Respuesta
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Power and control
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Schematic and wiring
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Power and wiring
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Control and power
Pregunta 3
Pregunta
What is best use to demonstrate how electrical circuits works?
Respuesta
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Schematic diagram
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Wiring diagram
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Power source diagram
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Control diagram
Pregunta 4
Pregunta
Which diagram is used to find the physical location of a component?
Respuesta
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Schematic diagram
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Wiring diagram
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Power source diagram
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Control diagram
Pregunta 5
Pregunta
A device that reacts to changes in a variable-condition is referred to as?
Respuesta
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A relay device
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An igniting device
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A load device
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A controlling device
Pregunta 6
Pregunta
An example of a load device is
Respuesta
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Thermostat
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Limit switch
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Fan switch
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Gas valve
Pregunta 7
Pregunta
What is an example of a limit safety control device?
Respuesta
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High limit switch
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High temperature switches
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Low-pressure switch
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All the above
Pregunta 8
Pregunta
Power supplies if 24 volts, are used to operate what part of the system?
Respuesta
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The power circuit
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The control circuit
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The protection circuit
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The thermocouple circuit
Pregunta 9
Pregunta
When does a gas fired furnace in a single-dwelling require a disconnect switch?
Respuesta
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Always
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Not required
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As required by section 26 in the CEC
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As required by section 16 in the CEC
Pregunta 10
Pregunta
Is a residential furnace allowed to have a light in the furnace room on its supply circuit?
Respuesta
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Yes
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No
Pregunta 11
Pregunta
What section of the CEC deals with the control circuit wiring?
Respuesta
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Section 16
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Section 26
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Section 28
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Section 32
Pregunta 12
Pregunta
What are the most commonly used types of temperature-sensing devices?
Respuesta
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Bimetal temperature-sensing elements
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thermistors
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RDT’s
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Pyrometer’s
Pregunta 13
Pregunta
Which type of temperature-sensing device is best used to operate large snap action contacts such as line voltage thermostats?
Respuesta
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Strip type bimetal temperature-sensing element
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Spiral type bimetal-sensing device
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Liquid bulb type
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Bellows type temperature-sensing devices
Pregunta 14
Pregunta
What type of temperature sensing device is especially suitable for pipes or tanks
Respuesta
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Bellows type
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Liquid bulb type
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Thermocouple
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Thermistor
Pregunta 15
Pregunta
A thermocouple generates a typical voltage of?
Respuesta
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20mv
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30mv
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40mv
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50mv
Pregunta 16
Pregunta
A thermopile generates a typical voltage of up to
Respuesta
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500mv
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600mv
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700mv
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800mv
Pregunta 17
Pregunta
Which of these two devices has a constant temperature to resistance ratio?
Respuesta
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RTD
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Thermistor
Pregunta 18
Pregunta
The types of contacts used in thermostats are?
Respuesta
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Mercury
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Spring activated, snap-action, exposed
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Glass-enclosed, magnet and armature snap-action
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All the above
Pregunta 19
Pregunta
In a heating thermostat the anticipator has what type of connection with the contacts?
Respuesta
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Series connection
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Parallel connection
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Combination connection
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Compound connection
Pregunta 20
Pregunta
In a cooling thermostat the anticipator has what type of connection with the contacts?
Respuesta
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Series connection
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Parallel connection
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Combination connection
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Compound connection
Pregunta 21
Pregunta
Where is the best location for a thermostat?
Respuesta
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On an inside wall
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On an outside wall
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Under the HVAC
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Directly opposite the heat flow
Pregunta 22
Pregunta
The usual setting of a high limit switch for a furnace is?
Respuesta
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70-80 degrees C
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80-100 degrees C
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90-130 degrees C
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80-120 degrees C
Pregunta 23
Pregunta
When not connected to the power supply, the position of the thermocouple relative to the pilot flame should be adjusted to read?
Respuesta
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Open circuit test of 26-32 mv
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Closed circuit test of 26-32 mv
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Open circuit test of 7.5-15 mv
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Closed circuit test of 7.5-15 mv
Pregunta 24
Pregunta
What type of control switch resets when the temperature drops 11 degrees below the set point?
Respuesta
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High limit/ fan control switch
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Thermostat actuator switch
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High limit main gas valve switch
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Summer switch
Pregunta 25
Pregunta
What device is represented by the words COMP in a legend?
Respuesta
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Contactor
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Compressor motor
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Condenser fan motor
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Indoor fan motor
Pregunta 26
Pregunta
What type of thermostat is used for a basic heating system?
Respuesta
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Two wire
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Three wire
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Five wire
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Seven wire
Pregunta 27
Pregunta
Which type of thermostat will have an on-off-auto switch?
Respuesta
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Two wire
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Three wire
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Five wire
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Seven wire
Pregunta 28
Pregunta
Which type of thermostat is used for combination heating and cooling units?
Respuesta
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Two wire
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Three wire
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Five wire
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Seven wire
Pregunta 29
Pregunta
Which type of thermostat is required for two stage heat and two stage cooling?
Respuesta
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Two wire
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Three wire
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Five wire
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Seven wire
Pregunta 30
Pregunta
When do you connect RH and RC together in a five wire thermostat
Respuesta
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When one control transformer is used
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When two or more control transformers are used
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