2025 NBRC TMC MOCK ACTUAL EXAM COMPLETE
FULL LENGTH EXAM 50 QUESTION CORRECTLY
ANSWERED
A patient breathing 50% oxygen has a PaO2 of 248 torr. Which of the following should the RT
recommend?
A. Discontinue O2 therapy
B. Decrease the oxygen to 30%
C. Titrate oxygen to maintain an SpO2 > 93%
D. Repeat the blood gases because the PaO2 is not possible on this FiO2.
C. Titrate oxygen to maintain an SpO2 > 93%
Explanation: A PaO2 of 250 torr is normal on 50% O2. Remember, to determine the normal PaO2 on any
given O2%, multiply the O2% by 5. This is an approximation. If titrate was not a choice, then you would
discontinue the oxygen.
A patient is receiving 30% oxygen via an air-entrainment mask at a flow of 5 L/min. The total flow
delivered by this device is which of the following?
A. 36 L/min
B. 45 L/min
C. 54 L/min
D. 60 L/min
(*Use 21 with O2 % less than 40%)
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
B. 45 L/min
, Secretions tend to become thicker if the inspired air has which of the following characteristics?
A. A relative humidity of 100% at body temperature
B. 32 mg H2O per liter of gas
C. A water vapor pressure of 47 mmHg
D. 48 mg H2O per liter of gas
B. 32 mg H2O per liter of gas
A patient receiving 38 mg H2O per liter of gas from a nebulizer has a humidity deficit of which of the
following?
A. 6 mg/L
B. 9 mg/L
C. 12 mg/L
D. 18 mg/L
44-38= 6
A. 6 mg/L
After connecting a nasal cannula to the humidifier outlet, you kink the tubing and hear a whistling
noise coming from the humidifier. Which of the following most likely has caused this?
A. The humidifier jar is cracked
B. The capillary tube in the humidifier is disconnected
C. The humidifier has no leaks
D. The top of the humidifier is not screwed on tightly
C. The humidifier has no leaks
You notice that the patient's secretions have become thicker and more difficult to suction since the
ventilator humidifier was replaced with an HME. The RT should recommend which of the following?
A. Increase inspiratory flow
B. Decrease the temperature to the HME
C. Replace with a new HME
D. Replace the HME with a conventional heated humidifier
D. Replace the HME with a conventional heated humidifier
FULL LENGTH EXAM 50 QUESTION CORRECTLY
ANSWERED
A patient breathing 50% oxygen has a PaO2 of 248 torr. Which of the following should the RT
recommend?
A. Discontinue O2 therapy
B. Decrease the oxygen to 30%
C. Titrate oxygen to maintain an SpO2 > 93%
D. Repeat the blood gases because the PaO2 is not possible on this FiO2.
C. Titrate oxygen to maintain an SpO2 > 93%
Explanation: A PaO2 of 250 torr is normal on 50% O2. Remember, to determine the normal PaO2 on any
given O2%, multiply the O2% by 5. This is an approximation. If titrate was not a choice, then you would
discontinue the oxygen.
A patient is receiving 30% oxygen via an air-entrainment mask at a flow of 5 L/min. The total flow
delivered by this device is which of the following?
A. 36 L/min
B. 45 L/min
C. 54 L/min
D. 60 L/min
(*Use 21 with O2 % less than 40%)
(100- 30%)/ (30%-*21) = 70/9 = 8/1 or 8:1 ratio
8+1= 9
9x5 = 45 L/min
B. 45 L/min
, Secretions tend to become thicker if the inspired air has which of the following characteristics?
A. A relative humidity of 100% at body temperature
B. 32 mg H2O per liter of gas
C. A water vapor pressure of 47 mmHg
D. 48 mg H2O per liter of gas
B. 32 mg H2O per liter of gas
A patient receiving 38 mg H2O per liter of gas from a nebulizer has a humidity deficit of which of the
following?
A. 6 mg/L
B. 9 mg/L
C. 12 mg/L
D. 18 mg/L
44-38= 6
A. 6 mg/L
After connecting a nasal cannula to the humidifier outlet, you kink the tubing and hear a whistling
noise coming from the humidifier. Which of the following most likely has caused this?
A. The humidifier jar is cracked
B. The capillary tube in the humidifier is disconnected
C. The humidifier has no leaks
D. The top of the humidifier is not screwed on tightly
C. The humidifier has no leaks
You notice that the patient's secretions have become thicker and more difficult to suction since the
ventilator humidifier was replaced with an HME. The RT should recommend which of the following?
A. Increase inspiratory flow
B. Decrease the temperature to the HME
C. Replace with a new HME
D. Replace the HME with a conventional heated humidifier
D. Replace the HME with a conventional heated humidifier
