ER-2720 assignment

Descrição

Quiz on ER-2720, created by Kaitlyn Hickey on 03/02/2018.
Kaitlyn Hickey
Quiz por Kaitlyn Hickey, atualizado more than 1 year ago
Kaitlyn Hickey
Criado por Kaitlyn Hickey mais de 6 anos atrás
30
3

Resumo de Recurso

Questão 1

Questão
Which schematic diagram represents a heating thermostat?
Responda
  • NC temperature-actuated switch
  • NO temperature-actuated
  • NC liquid level-actuated switch
  • NO liquid level-actuated switch

Questão 2

Questão
What are the two types of electrical diagrams used in the heating and cooling industry?
Responda
  • Power and control
  • Schematic and wiring
  • Power and wiring
  • Control and power

Questão 3

Questão
What is best use to demonstrate how electrical circuits works?
Responda
  • Schematic diagram
  • Wiring diagram
  • Power source diagram
  • Control diagram

Questão 4

Questão
Which diagram is used to find the physical location of a component?
Responda
  • Schematic diagram
  • Wiring diagram
  • Power source diagram
  • Control diagram

Questão 5

Questão
A device that reacts to changes in a variable-condition is referred to as?
Responda
  • A relay device
  • An igniting device
  • A load device
  • A controlling device

Questão 6

Questão
An example of a load device is
Responda
  • Thermostat
  • Limit switch
  • Fan switch
  • Gas valve

Questão 7

Questão
What is an example of a limit safety control device?
Responda
  • High limit switch
  • High temperature switches
  • Low-pressure switch
  • All the above

Questão 8

Questão
Power supplies if 24 volts, are used to operate what part of the system?
Responda
  • The power circuit
  • The control circuit
  • The protection circuit
  • The thermocouple circuit

Questão 9

Questão
When does a gas fired furnace in a single-dwelling require a disconnect switch?
Responda
  • Always
  • Not required
  • As required by section 26 in the CEC
  • As required by section 16 in the CEC

Questão 10

Questão
Is a residential furnace allowed to have a light in the furnace room on its supply circuit?
Responda
  • Yes
  • No

Questão 11

Questão
What section of the CEC deals with the control circuit wiring?
Responda
  • Section 16
  • Section 26
  • Section 28
  • Section 32

Questão 12

Questão
What are the most commonly used types of temperature-sensing devices?
Responda
  • Bimetal temperature-sensing elements
  • thermistors
  • RDT’s
  • Pyrometer’s

Questão 13

Questão
Which type of temperature-sensing device is best used to operate large snap action contacts such as line voltage thermostats?
Responda
  • Strip type bimetal temperature-sensing element
  • Spiral type bimetal-sensing device
  • Liquid bulb type
  • Bellows type temperature-sensing devices

Questão 14

Questão
What type of temperature sensing device is especially suitable for pipes or tanks
Responda
  • Bellows type
  • Liquid bulb type
  • Thermocouple
  • Thermistor

Questão 15

Questão
A thermocouple generates a typical voltage of?
Responda
  • 20mv
  • 30mv
  • 40mv
  • 50mv

Questão 16

Questão
A thermopile generates a typical voltage of up to
Responda
  • 500mv
  • 600mv
  • 700mv
  • 800mv

Questão 17

Questão
Which of these two devices has a constant temperature to resistance ratio?
Responda
  • RTD
  • Thermistor

Questão 18

Questão
The types of contacts used in thermostats are?
Responda
  • Mercury
  • Spring activated, snap-action, exposed
  • Glass-enclosed, magnet and armature snap-action
  • All the above

Questão 19

Questão
In a heating thermostat the anticipator has what type of connection with the contacts?
Responda
  • Series connection
  • Parallel connection
  • Combination connection
  • Compound connection

Questão 20

Questão
In a cooling thermostat the anticipator has what type of connection with the contacts?
Responda
  • Series connection
  • Parallel connection
  • Combination connection
  • Compound connection

Questão 21

Questão
Where is the best location for a thermostat?
Responda
  • On an inside wall
  • On an outside wall
  • Under the HVAC
  • Directly opposite the heat flow

Questão 22

Questão
The usual setting of a high limit switch for a furnace is?
Responda
  • 70-80 degrees C
  • 80-100 degrees C
  • 90-130 degrees C
  • 80-120 degrees C

Questão 23

Questão
When not connected to the power supply, the position of the thermocouple relative to the pilot flame should be adjusted to read?
Responda
  • Open circuit test of 26-32 mv
  • Closed circuit test of 26-32 mv
  • Open circuit test of 7.5-15 mv
  • Closed circuit test of 7.5-15 mv

Questão 24

Questão
What type of control switch resets when the temperature drops 11 degrees below the set point?
Responda
  • High limit/ fan control switch
  • Thermostat actuator switch
  • High limit main gas valve switch
  • Summer switch

Questão 25

Questão
What device is represented by the words COMP in a legend?
Responda
  • Contactor
  • Compressor motor
  • Condenser fan motor
  • Indoor fan motor

Questão 26

Questão
What type of thermostat is used for a basic heating system?
Responda
  • Two wire
  • Three wire
  • Five wire
  • Seven wire

Questão 27

Questão
Which type of thermostat will have an on-off-auto switch?
Responda
  • Two wire
  • Three wire
  • Five wire
  • Seven wire

Questão 28

Questão
Which type of thermostat is used for combination heating and cooling units?
Responda
  • Two wire
  • Three wire
  • Five wire
  • Seven wire

Questão 29

Questão
Which type of thermostat is required for two stage heat and two stage cooling?
Responda
  • Two wire
  • Three wire
  • Five wire
  • Seven wire

Questão 30

Questão
When do you connect RH and RC together in a five wire thermostat
Responda
  • When one control transformer is used
  • When two or more control transformers are used

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