Analog Communications Mock Test 9

10%

Question 1 of 10

1. What is the auto correction function of white noise?

Parabolic Function

Step Function

Ramp Function

Impulse Function

Question 1 of 10

Question 2 of 10

2. Frequency components of an AM wave are?

Upper side band (ω_c - ω_m) having amplitude ^mA⁄₄

Lower side band (ω_c + ω_m) having amplitude ^mA⁄₄

Carrier frequency (ω_c) with amplitude A

Carrier frequency (ω_c) with amplitude ^A⁄₂

Question 2 of 10

Question 3 of 10

3. What is the probability density function of thermal noise?

Poisson

Gaussian

Binomial

Bessel

Question 3 of 10

Question 4 of 10

4. An antenna’s beamwidth is measured ________

from +90° to -90°

between the major side lobes

between the minor side lobes

between half power points

Question 4 of 10

Question 5 of 10

5. Measured on the ground, the field strength of a horizontally polarized half wave dipole antenna is strongest ________

in one direction

in two directions

depends on the number of elements

depends on the shape of antenna

Question 5 of 10

Question 6 of 10

6. The typical antenna in an AM radio is a ________

helical

loop dipole

dipole

ferrite “loop-stick”

Question 6 of 10

Question 7 of 10

7. The end-to-end length of a half wave dipole antenna is actually ________

lambda wavelength

half lambda wavelength

slightly shorter than a half wavelength

slightly longer than a half wavelength

Question 7 of 10

Question 8 of 10

8. AM waves is represented by E_t cos⁡ ω_c t. What does E_t denotes?

amplitude of modulated wave

amplitude of carrier signal

amplitude of message signal

amplitude of modulating signal

Question 8 of 10

Question 9 of 10

9. The polarization of plane waves received from satellite is changed by ________

Faraday rotation

Distance travelled

Gamma rays

Helical rotation

Question 9 of 10

Question 10 of 10

10. Which one of the following is not an omnidirectional antenna?

Marconi

Log-periodic

Discone

Half-wave dipole

Question 10 of 10