NATE A/C Exam #1
A 3ton residential cut up machine ought to flow approximately how many CFM general?
A: 800 CFM
B: a thousand CFM
C: 1200 CFM
D: 1500 CFM - ANS-C: 1200 CFM
Rule of thumb, tonnage x 400 = cfm; three x four hundred = 1,200cfm
A compressor is brief biking. Which of the subsequent might now not be the motive?
A: Low strain controller differential set too close
B: Automatic reset excessive strain manage differential set too near
C: Low refrigerant rate
D: Leaking compressor suction valve - ANS-D: Leaking compressor suction valve
A double suction riser is used to
A: Help improve refrigerant return
B: Allow the compressor to pump at a more potential
C: Decrease suction line resistance
D: Improve oil return as device potential modifications - ANS-D: Improve oil return as device
capability modifications
A completely hermetic compressor on a three ton residential split machine has 3 electrical
terminals at the side of the compressor. An ohmmeter reads the subsequent: terminal A to B =
20 ohms, A to C = 15 ohms and B to C = 5 ohms. There became a reading of infinity among all
3 terminals to floor. Which terminal is the common terminal?
A: Terminal A is common
, B: Terminal B is common
C: Terminal C is commonplace
D: There is no common terminal on this type compressor - ANS-C: Terminal C is common
To decide the common terminal, locate the to terminals with the best analyzing. The terminal left
over is the not unusual terminal. Put the probe at the common terminal and both of the other
terminals, highest analyzing is the Start terminal, and the other is the run terminal.
A grille ready with a damper control is known as
A: A vane
B: A sign in
C: A louver
D: A damper - ANS-B: A sign in
A warm liquid line with a low to normal high facet stress is an indication of
A: An overcharged device
B: An undercharged device
C: Air within the machine
D: A confined filterdrier - ANS-B: An undercharged system
A hot timber stove offers up warmth to the room by using
A: Conduction
B: Convection
C: Radiation
D: All 3 on the equal time - ANS-D: All three at the same time
A lockout relay may be reset by
A: De-energizing the principle strength
A 3ton residential cut up machine ought to flow approximately how many CFM general?
A: 800 CFM
B: a thousand CFM
C: 1200 CFM
D: 1500 CFM - ANS-C: 1200 CFM
Rule of thumb, tonnage x 400 = cfm; three x four hundred = 1,200cfm
A compressor is brief biking. Which of the subsequent might now not be the motive?
A: Low strain controller differential set too close
B: Automatic reset excessive strain manage differential set too near
C: Low refrigerant rate
D: Leaking compressor suction valve - ANS-D: Leaking compressor suction valve
A double suction riser is used to
A: Help improve refrigerant return
B: Allow the compressor to pump at a more potential
C: Decrease suction line resistance
D: Improve oil return as device potential modifications - ANS-D: Improve oil return as device
capability modifications
A completely hermetic compressor on a three ton residential split machine has 3 electrical
terminals at the side of the compressor. An ohmmeter reads the subsequent: terminal A to B =
20 ohms, A to C = 15 ohms and B to C = 5 ohms. There became a reading of infinity among all
3 terminals to floor. Which terminal is the common terminal?
A: Terminal A is common
, B: Terminal B is common
C: Terminal C is commonplace
D: There is no common terminal on this type compressor - ANS-C: Terminal C is common
To decide the common terminal, locate the to terminals with the best analyzing. The terminal left
over is the not unusual terminal. Put the probe at the common terminal and both of the other
terminals, highest analyzing is the Start terminal, and the other is the run terminal.
A grille ready with a damper control is known as
A: A vane
B: A sign in
C: A louver
D: A damper - ANS-B: A sign in
A warm liquid line with a low to normal high facet stress is an indication of
A: An overcharged device
B: An undercharged device
C: Air within the machine
D: A confined filterdrier - ANS-B: An undercharged system
A hot timber stove offers up warmth to the room by using
A: Conduction
B: Convection
C: Radiation
D: All 3 on the equal time - ANS-D: All three at the same time
A lockout relay may be reset by
A: De-energizing the principle strength
