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b) On the past output as well as present inputs
c) Only on past inputs
d) Only on present outputs

16. A pulse train can be delayed by a finite number of periods using clocks in
a) PISO b) SIPO c) PIPO d) SISO

17. A 1000 KHz carrier is simultaneously modulated with 300 Hz and 200 Hz audio sine waves. The
frequency which will not be present in output is

a) 998 KHz b) 999.7 KHz c) 1000.3 KHz d)700 KHz

18. If modulation index of AM wave is changed from 0 to 1, the transmitted power
a) Increases by 50% b) Increases by 75%
c) Increases by 100% d) Remains unaffected

19. In a superheterodyne receiver IF is 455KHz ,if it is tuned to 1200KHz,the image frequency will be
a) 1655 KHz b)745 KHz c)2110KHz 0) 910 KHz

20. In the generation of a modulated signal, a varactor diode can be used for
a) FM generation only. %) AM generation only.
c) PM generation only. d) Both (b) and (c).

21. Which of the following statements 15 NOT correct regarding the signal x(t) = 5 sin(2a x
10°t)sin(2x x 100) ?
a) Upper sideband frequency is 1001000.
b) Lower sideband frequency is 999000.
€) x(t) 15 a DSB-SC signal.
d) x(t) 15 an AM signal.

22. If an angle modulated signal is given by fa(t) = cos(2 x 10470 + 75 sin 2 x 10° x t) then peak
frequency deviation of the carrier is

a) 1 KHz b) 7.5 KHz c) 75 KHz d) 100 MHz
23. The fundamental period of the signal °° is
a) 1/0೦ b) 2700 €) 27/00 6) 2

24. Energy ofa signal Ad[n] + Ad[n-1] is

a) 2A? b) ൧/2 c) &2/4 9) A?
25. | = sim(t)6(t) is equal to
8) ०० b) 2 ०)0 d) 1/2

26. The Nyquist sampling rate of the continuous time signal Sinc(S00t) is

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