Digital Modulation Techniques – 1 – 1

1. Frequency shift keying is used mostly in :

(a) Telephony
(b) Telegraphy
(c) Radio transmission
(d) None of the above

ANSWER

EXPLANATION

2. Which of the following gives maximum probability of error ?

(a) ASK
(b) BFSK
(c) BPSK
(d) DPSK

ANSWER

EXPLANATION

3. Which of the following gives minimum probability of error ?

(a) ASK
(b) BFSK
(c) BPSK
(d) DPSK

ANSWER

EXPLANATION

4. ASK, BPSK, QPSK and DPSK are examples of following encoding :

(a) Digital to analog
(b) Digital to digital
(c) Analog to digital
(d) Analog to analog

ANSWER

EXPLANATION

5. The main circuit used in DPSK modulator is :

(a) NOR gate
(b) NAND gate
(c) XNOR gate
(d) OR gate

ANSWER

EXPLANATION

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