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ER-2720 assignment

Description

Quiz on ER-2720, created by Kaitlyn Hickey on 03/02/2018.
Kaitlyn Hickey
Quiz by Kaitlyn Hickey, updated more than 1 year ago
Kaitlyn Hickey
Created by Kaitlyn Hickey about 6 years ago
30
3
0

Resource summary

Question 1

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

Question 2

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

Question 3

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

Question 4

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

Question 5

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

Question 6

Question
An example of a load device is
Answer
  • Thermostat
  • Limit switch
  • Fan switch
  • Gas valve

Question 7

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

Question 8

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

Question 9

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

Question 10

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

Question 11

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

Question 12

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

Question 13

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

Question 14

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

Question 15

Question
A thermocouple generates a typical voltage of?
Answer
  • 20mv
  • 30mv
  • 40mv
  • 50mv

Question 16

Question
A thermopile generates a typical voltage of up to
Answer
  • 500mv
  • 600mv
  • 700mv
  • 800mv

Question 17

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

Question 18

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

Question 19

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

Question 20

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

Question 21

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

Question 22

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

Question 23

Question
When not connected to the power supply, the position of the thermocouple relative to the pilot flame should be adjusted to read?
Answer
  • 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

Question 24

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

Question 25

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

Question 26

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

Question 27

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

Question 28

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

Question 29

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

Question 30

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