NATE AC SERVICE CERTIFICATION UPDATED EXAMS
TEST PAPER QUESTIONS AND ANSWERS SURE A+
✔✔Will a Capacitor Start-Capacitor Run (CSCR) motor that has an open run capacitor
start?
A. No, it would be unable to start without the run capacitor
B. It may start, but it draws a higher than normal running current
C. Yes, it will start, but it will run backwards
D. It can only start if the voltage is higher - ✔✔*A
✔✔Which microfarad value indicates a good start capacitor rated at 145-175 mfd?
A. 130
B. 160
C. 180
D. 190 - ✔✔B. 160
✔✔What effect does insufficient voltage have on a solenoid valve?
A. It causes flash gas formation
B. The valve will operate normally
C. The valve will remain half open
, D. The valve will vibrate or chatter - ✔✔*D
✔✔What does a test of the compressor oil after a burnout indicate?
A. Acidity
B. Smoke
C. Viscosity
D. Alkalinity - ✔✔A. Acidity
✔✔A system with a reciprocating compressor is pumped down and the power is shut
off. If the suction pressure rises very rapidly, this is an indication that the:
A. system is overcharged.
B. system has a restriction in the refrigerant lines.
C. compressor valves are good.
D. compressor valves are defective. - ✔✔*D
✔✔Which one of the following conditions can cause a reduction from design capacity in
an air conditioner?
A. An undersized suction line
B. An oversized suction line
C. Heating elements that are open
D. A crankcase heater that is open - ✔✔A. An undersized suction line
✔✔What would cause a voltage reading accross a closed contact in a 24V control
circuit?
A. Can only be read with a true RMS meter
B. 24V is "sneaking" from another part of the circuit
C. Pitted or dirty contacts
D. Normal operation - ✔✔C. Pitted or dirty contacts
✔✔Which of the following are the first two checks typically made on an electronic
control?
A. Presence of proper input signals and proper output voltages
B. Presence of any on board transformer voltages and proper output voltages
C. Ohm check of all sensors and solder side continuity checks
D. Continuity of all terminals and component side checks - ✔✔A. Presence of proper
input signals and proper output voltages
✔✔How should a technician evaluate the circuitry when the wiring diagram is missing?
A. Use a diagram from a similar equipment model
TEST PAPER QUESTIONS AND ANSWERS SURE A+
✔✔Will a Capacitor Start-Capacitor Run (CSCR) motor that has an open run capacitor
start?
A. No, it would be unable to start without the run capacitor
B. It may start, but it draws a higher than normal running current
C. Yes, it will start, but it will run backwards
D. It can only start if the voltage is higher - ✔✔*A
✔✔Which microfarad value indicates a good start capacitor rated at 145-175 mfd?
A. 130
B. 160
C. 180
D. 190 - ✔✔B. 160
✔✔What effect does insufficient voltage have on a solenoid valve?
A. It causes flash gas formation
B. The valve will operate normally
C. The valve will remain half open
, D. The valve will vibrate or chatter - ✔✔*D
✔✔What does a test of the compressor oil after a burnout indicate?
A. Acidity
B. Smoke
C. Viscosity
D. Alkalinity - ✔✔A. Acidity
✔✔A system with a reciprocating compressor is pumped down and the power is shut
off. If the suction pressure rises very rapidly, this is an indication that the:
A. system is overcharged.
B. system has a restriction in the refrigerant lines.
C. compressor valves are good.
D. compressor valves are defective. - ✔✔*D
✔✔Which one of the following conditions can cause a reduction from design capacity in
an air conditioner?
A. An undersized suction line
B. An oversized suction line
C. Heating elements that are open
D. A crankcase heater that is open - ✔✔A. An undersized suction line
✔✔What would cause a voltage reading accross a closed contact in a 24V control
circuit?
A. Can only be read with a true RMS meter
B. 24V is "sneaking" from another part of the circuit
C. Pitted or dirty contacts
D. Normal operation - ✔✔C. Pitted or dirty contacts
✔✔Which of the following are the first two checks typically made on an electronic
control?
A. Presence of proper input signals and proper output voltages
B. Presence of any on board transformer voltages and proper output voltages
C. Ohm check of all sensors and solder side continuity checks
D. Continuity of all terminals and component side checks - ✔✔A. Presence of proper
input signals and proper output voltages
✔✔How should a technician evaluate the circuitry when the wiring diagram is missing?
A. Use a diagram from a similar equipment model
