ADVANCE COMMUNICATION SYSYTEM MCQ-3

1. Which of the following is most widely used streaming video file format ?

(A) H 261
(B) H 262
(C) H 264
(D) None of these

2. What is a pager in the paging system ?

(A) A transmitter
(B) A transceiver
(C) Both (a) and (b)
(D) A receiver

3. A wifi enabled device can be ______

(A) Pc
(B) Mobile phone
(C) Both (a) and (b)
(D) None of these

4. Which is thickest layer of lonosphere ?

(A) F1
(B) F2
(C) D
(D) E

5. Bandwidth of Amplitude modulated signal is given by ______

(A) 2f_m
(B) f_c+f_m-(f_c-f_m)
(C) f_m
(D) Both (a) and (b)

6. Armstrong method is used for generation of

(A) Direct F.M.
(B) Indireet F.M.
(C) SSB-SC
(D) DSB-SC

7. The mutual information is ______

(A) Symmetric
(B) Always non-negative
(C) Both (a) and (b)
(D) None of these

8. H(X,Y) = H(Y/X)+______

(A) H(X)
(B) H(Y)
(C) H(X/Y)
(D) H(X,Y)

9. Channel capacity in communication system depends on

(A) Bandwidth
(B) S/N ratio
(C) Both (a) and (b)
(D) None of these

10. Man made noise is usually from ______

(A) Sky-wave
(B) Space-wave
(C) Both (a) and (b)
(D) None of these

11. Noise due to random behavior of charge carrier is ______

(A) Shot noise
(B) Flicker noise
(C) Partition noise
(D) None of these

12. Noise equivalent temperature of a two stage cascade network is given by :

(A) T_e1+T_e1
(B) T_e1/T_e1
(C) T_e1+T_e2
(D) T_e1+T_e2/G1

13. Power density is defined as ______ power per unit area.

(A) Reflected
(B) Refracted
(C) Radiated
(D) Diffracted

14. Steradian is a measuring unit of ______

(A) Point angle
(B) Linear angle
(C) Plane angle
(D) Solid angle

15. In Radar system the change in observed frequency is called ______

(A) Doppler shift
(B) Delta effect
(C) Delta shift
(D) None of these

16. Frequency of Ku band for satellite communication is ______

(A) 6/4 GHz
(B) 14/11 GHz
(C) 12/14 GHz
(D) 4/8 GHz

17. INTELSAT stands for

(A) Intel satellite
(B) Internal telephone satellite
(C) Internal telecommunication satellite
(D) None of these

18. Multimode steps index fibre has a large core diameter of range ______

(A) 100 to 300 μm
(B) 100 to 300 nm
(C) 200 to 500 μm
(D) 200 to 500 nm

19. When the base of logarithm is ‘2’, the unit of information is

(A) Bytes
(B) Bits
(C) Nats
(D) None of these

20. Radar is used to find ______

(A) Location
(B) Movement
(C) Precipitation
(D) All of the above