TMC NBRC MOCK EXAM QUESTIONS WITH 100%
CORRECT ANSWERS 2025-2026 A+ GRADE
A patient is receiving O2 from an E cylinder at 4 L/min through a nasal cannula. The cylinder
pressure is 1900 psig. How long will the cylinder run until it is empty?
47 min
1.7 h
2.2 h
3.6 h - CORRECT ->>E cylinder = 0.28 1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
After the Respiratory Therapist sets up a nonrebreathing mask on a patient at a flow rate of 10
L/min, the reservoir bag collapses before the patient finishes inspiring. The RT should do which
of the following?
Change to a simple mask at a flow rate of 10 L/min
Remove the one-way valve from the exhalation port.
Place the patient on continuous positive airway pressure (CPAP)
Increase the flow rate to 15 L/min - CORRECT ->>D. Increase the flow rate to 15 L/min
A patient with carbon monoxide (CO) poisoning can best be treated with which of the following
therapies?
Nasal Cannula at 6 L/min
Simple O2 mask at 10 L/min
CPAP and 60% O2
Nonrebreathing mask - CORRECT ->>D. Nonrebreathing mask
The following blood gas levels have been obtained from a patient using a 60% aerosol mask.
pH: 7.47
PaCO2: 31 mmHg
PaO2: 58 mmHg
What should the RT recommend at this time?
Place the patient on CPAP
Increase the O2 to 70%
Intubate and place the patient on mechanical ventilation
Change to a nonrebreathing mask - CORRECT ->>A. Place the patient on CPAP
Given the following data, what is the patient's total arterial O2 content?
pH: 7.41
PaCO2: 37 mmHg
PaO2: 88 mmHg
HCO3: 26 mEq/L
, SaO2: 95%
Hb: 14 g/dL
12 mL/dL
14 mL/dL
16 mL/dL
18 mL/dL - CORRECT ->>(Hb x 1.36 x SaO2) + (0.003 x PaO2) (14 x 1.36 x 0.95) + (0.003 x
88)
18.088 + 0.264
= 18.352
Answer: D. 18 mL/dL
The respiratory therapist receives an order to set up a moderate level of O2 on a patient who
arrives in the ED breathing at a rate of 35 breaths/min. Which of the following O2 delivery
devices is most appropriate to use in this situation?
Simple O2 mask at 10 L/min
Nasal cannula at 4 L/min
NRB Mask at 15 L/min
Air-entrainment mask at 40% O2 - CORRECT ->>D. Air-entrainment mask at 40% O2
A severe COPD patient arrives in the emergency department on a 2 L/min nasal cannula.
Arterial blood gas results follow:
pH: 7.32
PaCO2: 67 mmHg
PaO2: 62 mmHg
HCO3: 38 mEq/L
Which of the following is the most appropriate recommendation?
Increase the liter flow to 4 L/min
Maintain the current O2 level
Institute noninvasive positive pressure ventilation (NPPV)
Place on a NRB mask at 12 L/min - CORRECT ->>B. Maintain the current O2 level
CORRECT ANSWERS 2025-2026 A+ GRADE
A patient is receiving O2 from an E cylinder at 4 L/min through a nasal cannula. The cylinder
pressure is 1900 psig. How long will the cylinder run until it is empty?
47 min
1.7 h
2.2 h
3.6 h - CORRECT ->>E cylinder = 0.28 1900x0.28/4 = 133/60 = 2.21
Answer: C. 2 hours, 21 minutes
After the Respiratory Therapist sets up a nonrebreathing mask on a patient at a flow rate of 10
L/min, the reservoir bag collapses before the patient finishes inspiring. The RT should do which
of the following?
Change to a simple mask at a flow rate of 10 L/min
Remove the one-way valve from the exhalation port.
Place the patient on continuous positive airway pressure (CPAP)
Increase the flow rate to 15 L/min - CORRECT ->>D. Increase the flow rate to 15 L/min
A patient with carbon monoxide (CO) poisoning can best be treated with which of the following
therapies?
Nasal Cannula at 6 L/min
Simple O2 mask at 10 L/min
CPAP and 60% O2
Nonrebreathing mask - CORRECT ->>D. Nonrebreathing mask
The following blood gas levels have been obtained from a patient using a 60% aerosol mask.
pH: 7.47
PaCO2: 31 mmHg
PaO2: 58 mmHg
What should the RT recommend at this time?
Place the patient on CPAP
Increase the O2 to 70%
Intubate and place the patient on mechanical ventilation
Change to a nonrebreathing mask - CORRECT ->>A. Place the patient on CPAP
Given the following data, what is the patient's total arterial O2 content?
pH: 7.41
PaCO2: 37 mmHg
PaO2: 88 mmHg
HCO3: 26 mEq/L
, SaO2: 95%
Hb: 14 g/dL
12 mL/dL
14 mL/dL
16 mL/dL
18 mL/dL - CORRECT ->>(Hb x 1.36 x SaO2) + (0.003 x PaO2) (14 x 1.36 x 0.95) + (0.003 x
88)
18.088 + 0.264
= 18.352
Answer: D. 18 mL/dL
The respiratory therapist receives an order to set up a moderate level of O2 on a patient who
arrives in the ED breathing at a rate of 35 breaths/min. Which of the following O2 delivery
devices is most appropriate to use in this situation?
Simple O2 mask at 10 L/min
Nasal cannula at 4 L/min
NRB Mask at 15 L/min
Air-entrainment mask at 40% O2 - CORRECT ->>D. Air-entrainment mask at 40% O2
A severe COPD patient arrives in the emergency department on a 2 L/min nasal cannula.
Arterial blood gas results follow:
pH: 7.32
PaCO2: 67 mmHg
PaO2: 62 mmHg
HCO3: 38 mEq/L
Which of the following is the most appropriate recommendation?
Increase the liter flow to 4 L/min
Maintain the current O2 level
Institute noninvasive positive pressure ventilation (NPPV)
Place on a NRB mask at 12 L/min - CORRECT ->>B. Maintain the current O2 level
