NATE A/C Exam 2 QUESTIONS AND ANSWERS 100% ACCURATE.
Which of the following components is energized first after an intermittent ignition gas furnace
calls for heat?
A: Induced draft motor
B: Pilot valve
C: Blower motor
D: Gas valve - A
To have a system automatically switch to heating or cooling as the load changes, the thermostat:
A: System switch should be in auto
B: System switch should be in off
C: System switch should be on
D: Fan switch should be in auto - A
A typical heat pump uses a high-pressure control to shut off the compressor if the condensing
pressure becomes excessive. The control uses a switch that makes the compressor contact on a
pressure:
A: Rise at the compressor discharge
B: Fall at the compressor discharge
C: Difference between the high and low side
D: Combination of the high and low side - B
The number 3,412 btu is equal to:
A: 1 watt
B: 3.4 watts
C: 1 kilowatt
D: 3.4 kilowatts - C
,Gas heating systems on roofs or other elevated locations shall be accessible by way of the
building if the building is taller than:
A: 10 feet
B: 15 feet
C: 20 feet
D: 25 feet - B
Which of the following is typically covered by local codes?
A: Minimum cfm per outlet
B: Maximum length of a trunk
C: Termination of condensate line
D: Refrigerant charge - C
What is the difference between the wiring of an electromechanical thermostat and an electronic
thermostat?
A: Both the hot leg and the common of a 120-volt supply must be run to the electronic
thermostat.
B: Typically there is no difference, they are designed to be interchangeable.
C: Wire size used on the electronic thermostat must be larger.
D: Both the low voltage hot and common must be run to the electronic thermostat. - B
A secondary drain pan is used when an air conditioning system is located:
A: Above a ceiling
B: In a closet
C: Below grade
D: More than 30 feet from a useable drain - A
A person is sitting near a cold window on a winter day. They are losing heat to the cold window
by:
, A: Conduction
B: Convection
C: Radiation
D: Evaporation - C
In electrical wiring, the black conductor usually indicates:
A: The hot conductor
B: The neutral conductor
C: The ground wire
D: The safety wire - A
Which of the following is the correct equation for determining wattage in an electrical circuit?
A: W = P x I
B: W = E x I
C: W = I x R
D: W = E x R - B
The rpm of a motor is determined by:
A: The motor's voltage
B: The motor's amperage
C: The number of poles
D: The size of the motor windings - C
An ohmmeter reading of infinity across a switch means:
A: The switch is open
B: The switch is closed
C: The switch is good
Which of the following components is energized first after an intermittent ignition gas furnace
calls for heat?
A: Induced draft motor
B: Pilot valve
C: Blower motor
D: Gas valve - A
To have a system automatically switch to heating or cooling as the load changes, the thermostat:
A: System switch should be in auto
B: System switch should be in off
C: System switch should be on
D: Fan switch should be in auto - A
A typical heat pump uses a high-pressure control to shut off the compressor if the condensing
pressure becomes excessive. The control uses a switch that makes the compressor contact on a
pressure:
A: Rise at the compressor discharge
B: Fall at the compressor discharge
C: Difference between the high and low side
D: Combination of the high and low side - B
The number 3,412 btu is equal to:
A: 1 watt
B: 3.4 watts
C: 1 kilowatt
D: 3.4 kilowatts - C
,Gas heating systems on roofs or other elevated locations shall be accessible by way of the
building if the building is taller than:
A: 10 feet
B: 15 feet
C: 20 feet
D: 25 feet - B
Which of the following is typically covered by local codes?
A: Minimum cfm per outlet
B: Maximum length of a trunk
C: Termination of condensate line
D: Refrigerant charge - C
What is the difference between the wiring of an electromechanical thermostat and an electronic
thermostat?
A: Both the hot leg and the common of a 120-volt supply must be run to the electronic
thermostat.
B: Typically there is no difference, they are designed to be interchangeable.
C: Wire size used on the electronic thermostat must be larger.
D: Both the low voltage hot and common must be run to the electronic thermostat. - B
A secondary drain pan is used when an air conditioning system is located:
A: Above a ceiling
B: In a closet
C: Below grade
D: More than 30 feet from a useable drain - A
A person is sitting near a cold window on a winter day. They are losing heat to the cold window
by:
, A: Conduction
B: Convection
C: Radiation
D: Evaporation - C
In electrical wiring, the black conductor usually indicates:
A: The hot conductor
B: The neutral conductor
C: The ground wire
D: The safety wire - A
Which of the following is the correct equation for determining wattage in an electrical circuit?
A: W = P x I
B: W = E x I
C: W = I x R
D: W = E x R - B
The rpm of a motor is determined by:
A: The motor's voltage
B: The motor's amperage
C: The number of poles
D: The size of the motor windings - C
An ohmmeter reading of infinity across a switch means:
A: The switch is open
B: The switch is closed
C: The switch is good
