Analog Communications Mock Test 9

10%

Question 1 of 10

1. Bit is a unit of ________

Channel Capacity

Rate of information

Information

Entropy

Question 1 of 10

Question 2 of 10

2. Pick the odd one out.

Galactic noise

Atmospheric noise

Polar noise

Cosmic noise

Question 2 of 10

Question 3 of 10

3. What points must be important to remember, when we deal with random noise calculations?

calculations are based on quantised values

all calculations are based on peak to peak values

calculations are based on RMS values

calculations are based on average values

Question 3 of 10

Question 4 of 10

4. “Ground Effect” in antenna caused by ________

fading

faulty connection of the feed cable ground

radio signals reflecting off the ground

buildings and other structures on ground

Question 4 of 10

Question 5 of 10

5. Antennas are often tested in ________

a vacuum chamber

an anechoic chamber

an RF reflective chamber

atmosphere

Question 5 of 10

Question 6 of 10

6. A pre emphasis circuit provides extra noise immunity by __________

converting the phase modulation to FM

boosting the base frequencies

amplifying the whole audio band

amplifying the higher audio frequencies

Question 6 of 10

Question 7 of 10

7. Which of the following statement is true about a radio detector?

the linearity is worse than in phase discriminator

there is stabilization against signal strength variations

the circuit is same as in a discriminator, except that the diodes are reversed.

the final output is twice of that obtainable from a similar phase discriminator

Question 7 of 10

Question 8 of 10

8. The typical squelch circuit cuts off __________

RF interference when the signal is weak

An IF amplifier when Automatic Gain Control is minimum

An IF amplifier when Automatic Gain Control is maximum

An audio amplifier when the carrier is absent

Question 8 of 10

Question 9 of 10

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

Distance travelled

Gamma rays

Faraday rotation

Helical rotation

Question 9 of 10

Question 10 of 10

10. An ungrounded antenna near the ground ________

is unlikely to need a ground screen

must be horizontally polarized

acts as an antenna array

acts as a single antenna of twice the height

Question 10 of 10