Of What Potential Significance Is the Beam Non-Uniformity Ratio (BNR)

question 21

Multiple Choice

Of what potential significance is the beam non-uniformity ratio (BNR) of an ultrasound transducer?

• A)It is the ratio of the power of the ultrasound to the duty factor of the ultrasound.
• B)It is the ratio of the peak power to the average power in the cross section of the transducer.
• C)It is the ratio to the surface area of the transducer in square centimeters to measurable acoustical energy leaving the crystal in Watts.
• D)It is a ratio of the surface area of the transducer and how pulsed the energy is over the average area.

---

Definitions:

Overrunning Clutch

A drive-protection mechanism that prevents a drive member from being driven; for instance, after a starter motor has started the engine, the overrunning clutch prevents the engine from driving the starter and damaging it.

Flex Plate

A metal disc that connects the engine to the torque converter in automatic transmissions, allowing power transfer.

Driven Member

A component in a mechanical system that receives motion or power from another component, rather than generating it.

Centrifugal Lock-up

A mechanism in torque converters that locks the turbine to the pump when sufficient speed is achieved, improving fuel efficiency by eliminating slip.