Analog & Digital Modulation – 1 – 1

1. Which of the following modulating system is digital ?

(a) PPM
(b) PWM
(c) PCM
(d) PEM

ANSWER

EXPLANATION

2. In low level modulation system , the amplifiers following the modulated stage should be :

(a) Only class C amplifier
(b) Only harmonic generators
(c) Only linear amplifier
(d) Any of the above

ANSWER

EXPLANATION

3. In a low level amplitude modulation system, the amplifier following the modulated stage must be :

(a) A class C amplifier
(b) A linear device
(c) A non-linear device
(d) A harmonic device

ANSWER

EXPLANATION

4. PPM is :

(a) Digital modulating technique
(b) Analogue modulating technique
(c) Linear modulating technique
(d) Not a modulation technique

ANSWER

EXPLANATION

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