1.

Which formula will you use to calculate the wavelength of an RF wave whose frequency is f and that is traveling through free space?

1. ?= f/c

2. ?= fc

3. ?= c/2f

4. ?= c/f

2.

RFID systems typically use the transmission line with the following impedance:

1. 10 ?

2. 50 ?

3. 100 ?

4. 70 ?

3.

Which characteristic of an RF wave affects the performance of an RFID system in the vicinity of metal cans?

1. Reflection

2. Refraction

3. Diffraction

4. Absorption

4.

For signal strength V _s and noise strength V _n, the signal to noise ratio, SNR, can be calculated in decibels by using the following formula:

1. SNR= 20 log (V _s/V _n)

2. SNR= 10 log (V _s/V _n)

3. SNR = V _s/V _n

4. log(V _s/V _n)

5.

Which of the following is not the characteristic that affects the propagation of an RF wave through imperfect free space?

1. Reflection

2. Absorption

3. Diffraction

4. ERP

6.

Which of the following antenna types are typically not used in RFID systems?

1. Isotropic

2. Directional

3. Dipole

4. Monostatic

7.

Frequency shift keying is an example of which of the following? (Choose two.)

1. Digital modulation

2. Amplitude modulation

3. Phase modulation

4. Frequency modulation

8.

Which of the following generates a standing wave?

1. Impedance mismatch between antenna and transmission line

2. Water or products with water content

3. Metals

4. Objects with sharp edges

9.

In an environment of poor directivity, a reader might end up reading a tag outside its zone. This is...