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Worksheetspost test physics part 2
Total questions: 10
Worksheet time: 10mins
Continuous wave Doppler is a modality of ultrasound that is best used for:
Generating high-resolution images
Measuring velocities of objects in motion
Measuring distances of far-away objects
Resolving issues with range ambiguity
Which of the following malfunctions causes the line isolation monitor to alarm?
Total electrical current exceeding circuit capacity
Interruption of current to electrical outlets caused by a circuit breaker
Surge of current in the main power supply
Flow of current to ground in the isolated circuit
Kinetic energy is a property only of the:
pressure
temperature
volume
density
The pressure and volume per minute delivered from the central hospital oxygen supply are
2100 psi and 650 L/min
75 psi and 100 L/min
50 psi and 50 L/min
1600 psi and 100 L/min
Appropriate definition: relationships between pressure, volume and area
pressure = volume/area
force =
pressure x area
area = pressure/force
pressure = area/force
During normal laminar airflow, resistance is dependent on which characteristic of oxygen?
Temperature
Density
Viscosity
Molecular weight
The reason a patient is not burned by the return of energy from the patient to the ESU (electrosurgical unit, Bovie) is that
The exit current density is much less than that at the hand piece
The coagulation side of this circuit is positive relative to the ground side
Resistance in the patient ’s body attenuates the energy
The exit current density is much less than 3 MHz
Regarding Diathermy safety
Bipolar diathermy requires a passive electrode (‘diathermy plate’)
Ohm’s law states that current = voltage x resistance
Diathermy works because there is a high current density at the active electrode
The heat energy produced by cautery is proportional to the current at the tip of the active electrode
Concerning humidity and humidification of gases
Relative humidity is the ratio of absolute humidity to saturated humidity at a specified temperature
Heat and moisture exchangers can't achieve 50% humidity
Operating theatre humidity should be maintained at no more than 30%
The pin-index safety system is designed to prevent the incorrect connection of what to the anesthesia machine?
Scavenger unit
Flow meter
Gas cylinder
Pipeline supply
