Test
ER-2720 assignment
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Preguntas del test (30)
1Which schematic diagram represents a heating thermostat?
- ANC temperature-actuated switch
- BNO temperature-actuated
- CNC liquid level-actuated switch
- DNO liquid level-actuated switch
2What are the two types of electrical diagrams used in the heating and cooling industry?
- APower and control
- BSchematic and wiring
- CPower and wiring
- DControl and power
3What is best use to demonstrate how electrical circuits works?
- ASchematic diagram
- BWiring diagram
- CPower source diagram
- DControl diagram
4Which diagram is used to find the physical location of a component?
- ASchematic diagram
- BWiring diagram
- CPower source diagram
- DControl diagram
5A device that reacts to changes in a variable-condition is referred to as?
- AA relay device
- BAn igniting device
- CA load device
- DA controlling device
6An example of a load device is
- AThermostat
- BLimit switch
- CFan switch
- DGas valve
7What is an example of a limit safety control device?
- AHigh limit switch
- BHigh temperature switches
- CLow-pressure switch
- DAll the above
8Power supplies if 24 volts, are used to operate what part of the system?
- AThe power circuit
- BThe control circuit
- CThe protection circuit
- DThe thermocouple circuit
9When does a gas fired furnace in a single-dwelling require a disconnect switch?
- AAlways
- BNot required
- CAs required by section 26 in the CEC
- DAs required by section 16 in the CEC
10Is a residential furnace allowed to have a light in the furnace room on its supply circuit?
- AYes
- BNo
11What section of the CEC deals with the control circuit wiring?
- ASection 16
- BSection 26
- CSection 28
- DSection 32
12What are the most commonly used types of temperature-sensing devices?
- ABimetal temperature-sensing elements
- Bthermistors
- CRDT’s
- DPyrometer’s
13Which type of temperature-sensing device is best used to operate large snap action contacts such as line voltage thermostats?
- AStrip type bimetal temperature-sensing element
- BSpiral type bimetal-sensing device
- CLiquid bulb type
- DBellows type temperature-sensing devices
14What type of temperature sensing device is especially suitable for pipes or tanks
- ABellows type
- BLiquid bulb type
- CThermocouple
- DThermistor
15A thermocouple generates a typical voltage of?
- A20mv
- B30mv
- C40mv
- D50mv
16A thermopile generates a typical voltage of up to
- A500mv
- B600mv
- C700mv
- D800mv
17Which of these two devices has a constant temperature to resistance ratio?
- ARTD
- BThermistor
18The types of contacts used in thermostats are?
- AMercury
- BSpring activated, snap-action, exposed
- CGlass-enclosed, magnet and armature snap-action
- DAll the above
19In a heating thermostat the anticipator has what type of connection with the contacts?
- ASeries connection
- BParallel connection
- CCombination connection
- DCompound connection
20In a cooling thermostat the anticipator has what type of connection with the contacts?
- ASeries connection
- BParallel connection
- CCombination connection
- DCompound connection
21Where is the best location for a thermostat?
- AOn an inside wall
- BOn an outside wall
- CUnder the HVAC
- DDirectly opposite the heat flow
22The usual setting of a high limit switch for a furnace is?
- A70-80 degrees C
- B80-100 degrees C
- C90-130 degrees C
- D80-120 degrees C
23When not connected to the power supply, the position of the thermocouple relative to the pilot flame should be adjusted to read?
- AOpen circuit test of 26-32 mv
- BClosed circuit test of 26-32 mv
- COpen circuit test of 7.5-15 mv
- DClosed circuit test of 7.5-15 mv
24What type of control switch resets when the temperature drops 11 degrees below the set point?
- AHigh limit/ fan control switch
- BThermostat actuator switch
- CHigh limit main gas valve switch
- DSummer switch
25What device is represented by the words COMP in a legend?
- AContactor
- BCompressor motor
- CCondenser fan motor
- DIndoor fan motor
26What type of thermostat is used for a basic heating system?
- ATwo wire
- BThree wire
- CFive wire
- DSeven wire
27Which type of thermostat will have an on-off-auto switch?
- ATwo wire
- BThree wire
- CFive wire
- DSeven wire
28Which type of thermostat is used for combination heating and cooling units?
- ATwo wire
- BThree wire
- CFive wire
- DSeven wire
29Which type of thermostat is required for two stage heat and two stage cooling?
- ATwo wire
- BThree wire
- CFive wire
- DSeven wire
30When do you connect RH and RC together in a five wire thermostat
- AWhen one control transformer is used
- BWhen two or more control transformers are used
Información
- Descripción
- Quiz on ER-2720, created by Kaitlyn Hickey on 03/02/2018.
- Autor
- Kaitlyn Hickey
- Idioma
- English
- Visitas
- 44
- Etiquetas
- Valoración
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