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ER-2710 and 2720 block review

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Quiz on ER-2710 and 2720 block review , 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
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0

Resource summary

Question 1

Question
Which section of the CEC deals with installation of heating units
Answer
  • Section 12
  • Section 16
  • Section 46
  • Section 62

Question 2

Question
A BTU is
Answer
  • Heat energy required to raise the temperature of a litre of water 1F
  • Heat energy required to raise the temperature of a pound of water 1F
  • Heat energy required to raise the temperature of a pound of water 1C
  • Heat energy required to raise the temperature of a litre of water 1C

Question 3

Question
Heat transferred by electromagnetic wave motion by which we receive heat from the sun is through?
Answer
  • Conduction
  • Convection
  • Radiation
  • HVAC units

Question 4

Question
What is usually provided on the intake side of the fan in the return air system?
Answer
  • Supply plenum
  • Power supply filter
  • Filter
  • Flue or stack

Question 5

Question
A schematic diagram is used to
Answer
  • Demonstrate how electrical circuits work
  • Show the relative physical location of components
  • To wire a circuit
  • To find a control device

Question 6

Question
The function of the refrigeration cycle is to
Answer
  • Removes heat from low temperature body and delivers it to a high temperature body
  • Removes heat from a high temperature body and delivers it to a low temperature body
  • Rejects energy to low temperature body
  • None of the above

Question 7

Question
Which section of the CEC covers rules relating to disconnect switches for furnaces?
Answer
  • Section 12
  • Section 16
  • Section 28
  • Section 62

Question 8

Question
Which part of the HVAC system is responsible for compressing the Freon
Answer
  • Compressor
  • Condenser
  • Evaporator
  • TX valve

Question 9

Question
This type of compressor is completely sealed inside a metal housing and is not serviceable
Answer
  • Hermetic
  • Reciprocating
  • Scroll
  • Semi-hermetic

Question 10

Question
What substance is used in a heat cycle to transfer heat from one area, and remove it to another
Answer
  • Refrigerant
  • Neon
  • Vapor
  • Xenon

Question 11

Question
A conventional condenser unit requires a liquid refrigerant which is also called?
Answer
  • Freon
  • Hydrogen
  • Helium
  • Carbon dioxide

Question 12

Question
Which component pushes the hot gas to the finned condenser coil in the outdoor side of the air conditioner
Answer
  • Control valve
  • Evaporator thermal expansion valve
  • The receiver
  • The compressor

Question 13

Question
Two different pressures exist in the refrigeration cycle. Two components that separate the high-pressure side from the low-pressure side are:
Answer
  • Compressor and TRX valve
  • Evaporator coil and TRX valve
  • Condenser coil and compressor
  • Compressor and receiver

Question 14

Question
In the cooling mode, what component is located inside the building?
Answer
  • The condenser coils
  • The 4 way reversing valve
  • The compressor
  • The evaporator

Question 15

Question
To go from cooling source in a heat pump, what is required?
Answer
  • TRX valve
  • 4 way reversing valve
  • Double pole thermostat
  • A disconnect switch

Question 16

Question
The amount of heat added to the liquid to make it saturated and change states is called
Answer
  • Super heat
  • Heat energy
  • Latent heat
  • Transferred heat

Question 17

Question
Heat, that when added or removed, causes a change in temperature but not in state
Answer
  • Latent heat
  • Sensible heat
  • Low heat
  • Energy heat

Question 18

Question
Refrigerant lines are usually made from
Answer
  • Aluminum
  • Stainless steel
  • Copper
  • Either a or c

Question 19

Question
Which part of a cooling system absorbs heat from the air?
Answer
  • Condenser
  • Evaporator
  • Compressor
  • Accumulator

Question 20

Question
Why is it necessary to have a heating element in a heat pump?
Answer
  • To eliminate condenser freezing
  • To protect against high outside temperature
  • To protect against low outside temperature
  • To provide heat for the room

Question 21

Question
Which statement indicates an acceptable method of supplying power to a 65,000 BTU gas fired hot water furnace?
Answer
  • Supply furnace from basement lighting
  • Supply furnace from nearest receptacle
  • Supply furnace from smoke detector circuit
  • Supply from dedicated circuit

Question 22

Question
What describes heat transfer from one metal to another in a heating system?
Answer
  • Conduction
  • Radiation
  • Convection
  • Evaporator

Question 23

Question
What type of evaporator coil is used in a heat pump?
Answer
  • Fin tube
  • Helical tube
  • Plate tube
  • Air bay pass tube

Question 24

Question
What does a shop drawing show?
Answer
  • Cost of components
  • Elevation of components
  • Logical operation of components
  • Electrical rating of components

Question 25

Question
What if the minimum current rating for a disconnect serving a motor compressor?
Answer
  • 100% of the rate load current
  • 115% of the rated load current
  • 125% of the RLC
  • 140% of the RLC

Question 26

Question
A high limit control in a gas furnace control is switched with a fan limit control. What is the result?
Answer
  • The burner will not ignite
  • The fan will cycle on and off
  • The burner won’t turn off
  • The fan won’t run

Question 27

Question
Which calculation determines the size of the overload fuses for motor compressor appliances?
Answer
  • 100% of the rated load current
  • 115% of the rated load current
  • 125% of the RLC
  • 140% of the RLC
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