Analog Communications Mock Test 6

10%

Question 1 of 10

1. Which mathematically term is used for calculating FM bandwidth?

Bessel functions

Fractals

Trigonometry

Taylor series

Question 1 of 10

Question 2 of 10

2. Signal to noise ratio of a frequency modulated system is better than amplitude modulated system.

False

True

Question 2 of 10

Question 3 of 10

3. A resonant circuit is a simple form of bandpass filter.

False

True

Question 3 of 10

Question 4 of 10

4. Why AM stations has “low-fidelity”?

Commercial AM stations have a narrow bandwidth

AM is susceptible to noise

High quantization to noise ratio

Commercial AM stations use low power

Question 4 of 10

Question 5 of 10

5. What is the use of pre-emphasis?

to increase the signal to noise ratio for higher audio frequencies

to increase the signal to noise ratio for lower audio frequencies

to increase the signal to noise ratio for all audio frequencies

to allow stereo audio to be carried by FM stations

Question 5 of 10

Question 6 of 10

6. Which two networks can be used for impedance matching?

pi network and T network

bridge network and T network

pi network and omega network

pi network and bridge network

Question 6 of 10

Question 7 of 10

7. Which statement is true for low level amplitude modulation?

minimum RF power is required

all RF amplifiers can be linear

maximum RF power is required

all RF amplifiers are of class A

Question 7 of 10

Question 8 of 10

8. The modulation index can be derived from ________

time-domain signal

a highly modulated carrier wave

frequency-domain signal

both frequency and time domain signal

Question 8 of 10

Question 9 of 10

9. In high level amplitude modulation, power in the sidebands comes from _________

Driver stage

Modulating amplifier

RF amplifier

Carrier

Question 9 of 10

Question 10 of 10

10. What is the total sideband power if there is 100% modulation?

equal to the carrier wave

one-fourth of the carrier wave

twice the carrier wave

half the carrier wave

Question 10 of 10