Which receiver function eliminates the weaker reflections?

1. Reducing a 30-dB compensation gain by one half would display a new gain setting of:

 

a. 10 dB

b. 15 dB

c. 24 dB

d. 27 dB

2. Reduction in the intensity of the sound wave is a result of:

a. heat, reflection, and, transmission

b. absorption, scattering, and reflection

c. scattering, refraction, and absorption

d. absorption, scattering, and transmission

3. Divergence of the sound beam is demonstrated in the:

a. focal zone

b. dead zone

c. Fresnel zone

d. Fraunhofer zone

4. The ability of a sonogram to identify the true absence of disease is a test’s:

a. accuracy

b. specificity

c. sensitivity

d. positive predictive value

5. There is no confirmed significant biological effect in mammalian tissue for exposures:

a. below 100 W/cm2 with unfocused and 1 W/cm2 with focused transducers

b. above 100 W/cm2 with unfocused and 1 W/cm2 with focused transducers

c. below 1 mW/cm2 with unfocused and 1 mW/cm2 with focused transducers

d. below 100 mW/cm2 with unfocused and 1 W/cm2 with focused transducers

6. List the intensity ranges from smallest to highest:

a. SPTP, SATP, SPTA, SATA

b. SATA, SATP, SPTA, SPTP

c. SATA, SPTA, SATP, SPTP

d. SATA, SATP, SPTP, SPTA

7. Diagnostic ultrasound transducers operate on which of the following theories?

a. Snell’s law

b. ALARA principle

c. Piezoelectric effect

d. Huygens principle

8. Uniform intensity of the sound beam is located in the:

a. far field

b. near field

c. focal point

d. center of the beam

9. The amplitude of the transmitted and received signals is the responsibility of the:

a. pulser

b. amplifier

c. transducer

d. system output

10. Which receiver function eliminates the weaker reflections?

a. threshold

b. compression

c. compensation

d. demodulation

find the cost of your paper

Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator

1. (a) Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator: (i) series-connected, (ii) shunt-connected and (iii) compound-connected.   (b) State one purpose for which….

what happens if the resistance in series with the shunt field of a DC motor is increased in value

1. Sparking at the trailing edges of the brushes in a DC machine is usually prevented by fitting   (a) copper gauze brushes (b) a compensating winding (c) a compound….

Calculate the synchronous speed of a 10-pole three-phase machine connected to a 50 Hz supply.

1. The generator characteristic shown in Figure 9.28 is for a   (a) shunt machine (b) series machine (c) differentially compounded machine (d) cumulatively compounded machine 2.The speed of a….