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HVAC Gas Heat certification exam Questions & 100% Verified Answers Pack | Latest Update
HVAC Gas Heat certification exam Questions & 100% Verified Answers Pack | Latest Update
[Show more]HVAC Gas Heat certification exam Questions & 100% Verified Answers Pack | Latest Update
[Show more]Heat which causes a change in temperature of a substance is called; 
: Sensible Heat. 
heat added to substance without a rise in temperature; (example: liquid refrigerant to 
gas) this process is called? 
: Latent heat of vaporization. 
Heat added to the refrigerant in a vapor state after the evapo...
Preview 3 out of 16 pages
Add to cartHeat which causes a change in temperature of a substance is called; 
: Sensible Heat. 
heat added to substance without a rise in temperature; (example: liquid refrigerant to 
gas) this process is called? 
: Latent heat of vaporization. 
Heat added to the refrigerant in a vapor state after the evapo...
Upflow Furnace: 
: Is used to describe furnaces that stand upright and blow air upward. These 
systems are designed for first floor installation with attic ductwork or basement 
installation with ductwork positioned below the first floor. 
Low boy furnace: 
: Similar to Upflow except the furnace i...
Preview 2 out of 9 pages
Add to cartUpflow Furnace: 
: Is used to describe furnaces that stand upright and blow air upward. These 
systems are designed for first floor installation with attic ductwork or basement 
installation with ductwork positioned below the first floor. 
Low boy furnace: 
: Similar to Upflow except the furnace i...
Before working on an electric furnace the tech should 
: Review diagram, remove jewelry, and follow safety procedures. ALL OF THE 
ABOVE. 
A GFCI circuit breaker 
: detects current leaks to groound 
the conductor in an electric heat element is usually made of 
: Nichrome 
An example of resistive lo...
Preview 3 out of 17 pages
Add to cartBefore working on an electric furnace the tech should 
: Review diagram, remove jewelry, and follow safety procedures. ALL OF THE 
ABOVE. 
A GFCI circuit breaker 
: detects current leaks to groound 
the conductor in an electric heat element is usually made of 
: Nichrome 
An example of resistive lo...
The International Mechanical Code considers a "flammable Vapor" to be concentration 
of flammable constituents in the air which exceeds _____________ percent of its 
flammability limit. 
: 25% 
During installation or service of electrical controls, a digital multimeter set to voltage 
must be c...
Preview 3 out of 16 pages
Add to cartThe International Mechanical Code considers a "flammable Vapor" to be concentration 
of flammable constituents in the air which exceeds _____________ percent of its 
flammability limit. 
: 25% 
During installation or service of electrical controls, a digital multimeter set to voltage 
must be c...
using an ohmmeter, there is 120 VAC between high speed and ground wires, this 
indicates 
: open 
if temperature rise is too high... 
: increase fan speed 
how many of the 3 OSHA conditions defining confined spaces must be met 
: all 3 
what causes the temperature limit safety switch to shut off th...
Preview 2 out of 11 pages
Add to cartusing an ohmmeter, there is 120 VAC between high speed and ground wires, this 
indicates 
: open 
if temperature rise is too high... 
: increase fan speed 
how many of the 3 OSHA conditions defining confined spaces must be met 
: all 3 
what causes the temperature limit safety switch to shut off th...
Heat which causes a change in temperature of a substance is called 
: Sensible Heat 
Heat added to a substance without a rise in temperature is called 
: Latent Heat 
Heat added to refrigerant in a vapor state after the evaporation process is called 
: Superheat 
A scroll compressor moved refrigeran...
Preview 3 out of 16 pages
Add to cartHeat which causes a change in temperature of a substance is called 
: Sensible Heat 
Heat added to a substance without a rise in temperature is called 
: Latent Heat 
Heat added to refrigerant in a vapor state after the evaporation process is called 
: Superheat 
A scroll compressor moved refrigeran...
Can cause a packaged HVAC unit to run high head pressure? 
: The condenser coil is dirty. 
Condenser coil fins are often damaged by: 
: Hail storms. 
Frequent pressure washing. 
Salt spray. 
Insufficient rinsing after cleaning coils with strong acids and bases. 
Water cooled air conditioning systems...
Preview 1 out of 2 pages
Add to cartCan cause a packaged HVAC unit to run high head pressure? 
: The condenser coil is dirty. 
Condenser coil fins are often damaged by: 
: Hail storms. 
Frequent pressure washing. 
Salt spray. 
Insufficient rinsing after cleaning coils with strong acids and bases. 
Water cooled air conditioning systems...
Current flow is 
: the flow of electrons in the circuit 
impedance is 
: opposition to alternating current flow 
like charges 
: repel each other 
Any material that will readily release electrons is called 
: a conductor 
the symbol for current is 
: I 
Which of the following materials would best be...
Preview 3 out of 16 pages
Add to cartCurrent flow is 
: the flow of electrons in the circuit 
impedance is 
: opposition to alternating current flow 
like charges 
: repel each other 
Any material that will readily release electrons is called 
: a conductor 
the symbol for current is 
: I 
Which of the following materials would best be...
Propane and Butane are _______ than air: 
: Heavier 
What will be the resistance in the circuit if the supply voltage is 30V and current flowing 
through the circuit is 5A 
: 6 ohms 
Temperature at which oil starts to produce a waxy substance that may interfere with the 
refrigeration system 
: Fl...
Preview 1 out of 3 pages
Add to cartPropane and Butane are _______ than air: 
: Heavier 
What will be the resistance in the circuit if the supply voltage is 30V and current flowing 
through the circuit is 5A 
: 6 ohms 
Temperature at which oil starts to produce a waxy substance that may interfere with the 
refrigeration system 
: Fl...
An instrument that measures potential differences between 2 points in an electrical 
circuit is called? 
A. potentiometer 
B. thermistor 
C. ohmeter 
D. voltmeter 
: voltmeter 
This device uses a thermal sensing bulb at the outlet of the evaporator to sense 
temperature and control superheat 
A. a...
Preview 4 out of 33 pages
Add to cartAn instrument that measures potential differences between 2 points in an electrical 
circuit is called? 
A. potentiometer 
B. thermistor 
C. ohmeter 
D. voltmeter 
: voltmeter 
This device uses a thermal sensing bulb at the outlet of the evaporator to sense 
temperature and control superheat 
A. a...
What is an SSU and what does it do? 
: It is a unit located on the side of the first which receives power (120 volts) before 
anything located within the furnace itself. It primarily consists of a switch and a fuse, and 
it is what allows for power to flow to the door switch. Opening the switch on...
Preview 2 out of 5 pages
Add to cartWhat is an SSU and what does it do? 
: It is a unit located on the side of the first which receives power (120 volts) before 
anything located within the furnace itself. It primarily consists of a switch and a fuse, and 
it is what allows for power to flow to the door switch. Opening the switch on...
A gas furnace is to be installed in a garage. The national standards require that the 
burners and ignition sources must be located ______ above the floor 
: 18 inches 
A good description of how a bi-metal fan switch operates the blower motor on a gas 
furnace is 
: Temperature on- temperature off...
Preview 3 out of 17 pages
Add to cartA gas furnace is to be installed in a garage. The national standards require that the 
burners and ignition sources must be located ______ above the floor 
: 18 inches 
A good description of how a bi-metal fan switch operates the blower motor on a gas 
furnace is 
: Temperature on- temperature off...
A separate and distinct ventilation or exhaust system shall be provided for _____? 
(A)noxious gases (B) corrosive fumes (C)flammable vapors (D) incompatible materials. 
: D. 505.1.2 In systems conveying flammable vapors, gases, or mists, the 
concentration shall not exceed 25 percent of the lower...
Preview 3 out of 22 pages
Add to cartA separate and distinct ventilation or exhaust system shall be provided for _____? 
(A)noxious gases (B) corrosive fumes (C)flammable vapors (D) incompatible materials. 
: D. 505.1.2 In systems conveying flammable vapors, gases, or mists, the 
concentration shall not exceed 25 percent of the lower...
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