Microwave Technology

Level I

1. The microwave electromagnetic signal will not propagate through which medium between the probe and the part being tested?

a. A dielectric plastic.

b. A vacuum.

c. A thin metal foil.

d. Air.


2. In standing wave microwave interferometry, how is the electromagnetic signal transmitted and received?

a. The signal is transmitted from an emitter through the part and received in a separate receiver on the opposite side.

b. The signal is generated in an emitter, transmitted past the receiver to the part, and reflected back to the receiver from the part.

c. The signal is generated in an emitter and reflected from the part back to a separate receiver.

d. The signal is generated in an emitter, which receives the reflected signal from the part.


3. When microwave energy is reflected and refracted within the volume of the part there is:

a. a change in dielectric constant in the part.

b. a change in frequency.

c. an elastic energy loss.

d. a conductive surface in the part.

Level Il

1. The approximate wavelength of the microwave electromagnetic signal at 10 GHz in a material with e= 4.0 is:

a. 7mm

b. 23 mm

c. 15 mm

d. 24 mm


2. The least microwave energy penetration (in depth) would be achieved in material with which properties?

a. nitrile rubber: e = 2.5, tan o = 0.05

b. sapphire: e= 9.0, tan o= 0.0004

c. teflon: e= 2.1, tan o= 0.0002

d. natural rubber: e= 2.1, tan o= 0.005


3. The mechanism of microwave wave interaction with matter to create images is:

a. ionic conduction in conductive materials.

b. molecular dipole interactions and ionic conduction.

c. nuclear scattering.

d. electron excitation.