Q3.

Consider the following statements regarding random variables :

1. A discrete random variable will have a countable number of distinct values.

2. Continuous random variable is defined for the system which generates a finite number of outcomes within a finite period of time.

Which of the above statements is/are correct?

Q4.

Consider the following statements regarding modulation :

1. Analog modulation requires lower bandwidth than that for the digital modulation methods.

2. Separation of signal from noise is not possible in analog modulation. Therefore, repeaters can be used.

3. FDM is used for multiplexing in analog modulation.

Which of the above statements are correct?

Q5.

Consider the following statements regarding modulation :

1. In low-level modulation, linear amplifiers are required in order to avoid any waveform distortion.

2. High-efficiency class B amplifiers are used in high-level modulation.

3. In high level, modulation takes place in the last RF amplifier stage of the transmitter.

Which of the above statements are correct?