NATE AC SERVICE REVIEW EXAMS ACTUAL
QUESTIONS AND ANSWERS SURE A+
✔✔Which of the following should be done to reduce vibration noise transmission in
sheet metal ductwork?
A. Decrease fan speed to boost CFM
B. Rigidly anchor ductwork to the structure
C. Add isolation collars
D. Externally insulate both supply and return ductwork - ✔✔*C
✔✔What is the recommended maximum external static pressure used for heating and
cooling equipment with blowers for 5 tons of cooling or less (excluding high velocity)?
A. 1.0 IWC
B. 0.5 IWC
C. 0.3 IWC
D. 0.1 IWC - ✔✔D. 0.1 IWC
✔✔How would the technician check a three phase blower motor to determine that it is
rotating in the proper direction?
A. Start the motor briefly using the disconnect and verify proper rotation
, B. Check the direction in which the blower vanes are sloped
C. Look for a directional arrow on the side of the blower wheel
D. Start the motor and use hand to detect the presence of air flow - ✔✔*A
✔✔After startup, a technician finds a noise problem caused by a metal supply register
with several severely bent vanes. What repairs should be made to eliminate the noise?
A. Cover the backside of the misaligned vanes with ducts tape
B. None, the entire register should be replaced
C. Reduce airflow to the noisy register
D. Realign the misaligned van with pliers - ✔✔*B
✔✔The technician has determined a supply in a flexible duct system is leaking. Which
of the following should be checked?
A. All connections and outer layers of duct only
B. All take-off connections and outer layers of duct only
C. All connections and longitudinal seams
D. All connections including inner and outer layers - ✔✔D. All connections including
inner and outer layers
✔✔How would a technician repair a 1" hole in a section of duct board?
A. Cut out the hole, and fabricate, staple and tape a plug in place to fill the hole
B. Cut out the hole and fabricate and tape a plug in place to fill the hole
C. Cut out the hole and seal over the location with foil tape and mastic
D. Replace the entire section of duct board - ✔✔*C
✔✔Service site conditions are:
*House feels "drafty" in cooling,
*Properly sized 3-1/2 ton split system,
*High supply face velocities
*Ductwork is properly sized,
*Total CFM 1400
What do these readings indicate?
A. The system is operating normally and there is nothing wrong
B. The returns are undersized
C. The system is operating normally but the supply registers are too restrictive
D. The blower is set at too high CFM - ✔✔C. The system is operating normally but the
supply registers are too restrictive
✔✔In a simple refrigeration system, the refrigerant boils in the:
A. metering device.
QUESTIONS AND ANSWERS SURE A+
✔✔Which of the following should be done to reduce vibration noise transmission in
sheet metal ductwork?
A. Decrease fan speed to boost CFM
B. Rigidly anchor ductwork to the structure
C. Add isolation collars
D. Externally insulate both supply and return ductwork - ✔✔*C
✔✔What is the recommended maximum external static pressure used for heating and
cooling equipment with blowers for 5 tons of cooling or less (excluding high velocity)?
A. 1.0 IWC
B. 0.5 IWC
C. 0.3 IWC
D. 0.1 IWC - ✔✔D. 0.1 IWC
✔✔How would the technician check a three phase blower motor to determine that it is
rotating in the proper direction?
A. Start the motor briefly using the disconnect and verify proper rotation
, B. Check the direction in which the blower vanes are sloped
C. Look for a directional arrow on the side of the blower wheel
D. Start the motor and use hand to detect the presence of air flow - ✔✔*A
✔✔After startup, a technician finds a noise problem caused by a metal supply register
with several severely bent vanes. What repairs should be made to eliminate the noise?
A. Cover the backside of the misaligned vanes with ducts tape
B. None, the entire register should be replaced
C. Reduce airflow to the noisy register
D. Realign the misaligned van with pliers - ✔✔*B
✔✔The technician has determined a supply in a flexible duct system is leaking. Which
of the following should be checked?
A. All connections and outer layers of duct only
B. All take-off connections and outer layers of duct only
C. All connections and longitudinal seams
D. All connections including inner and outer layers - ✔✔D. All connections including
inner and outer layers
✔✔How would a technician repair a 1" hole in a section of duct board?
A. Cut out the hole, and fabricate, staple and tape a plug in place to fill the hole
B. Cut out the hole and fabricate and tape a plug in place to fill the hole
C. Cut out the hole and seal over the location with foil tape and mastic
D. Replace the entire section of duct board - ✔✔*C
✔✔Service site conditions are:
*House feels "drafty" in cooling,
*Properly sized 3-1/2 ton split system,
*High supply face velocities
*Ductwork is properly sized,
*Total CFM 1400
What do these readings indicate?
A. The system is operating normally and there is nothing wrong
B. The returns are undersized
C. The system is operating normally but the supply registers are too restrictive
D. The blower is set at too high CFM - ✔✔C. The system is operating normally but the
supply registers are too restrictive
✔✔In a simple refrigeration system, the refrigerant boils in the:
A. metering device.
