Explanation: Transit time is that time which is taken by the charge carriers to move from emitter to collector.

Explanation: Marconi is the first person who sent the first radio signal across the atlantic ocean. It was Maxwell who originated the theory of radio waves. After some years, it was Hertz who applied Maxwell theories to the production and reception of waves.

Explanation: A bypass capacitor is generally used to dampen the AC or noise present at all frequencies. In communication, it is used to remove RF from non-RF circuits.

Explanation: Agility is the process of changing operating frequency rapidly without a lot of returning.

Explanation: The quality factor Q, of a resonant circuit is a measure of a quality of resonant circuit, thus indicating the performance of the resonant circuit. Bandwidth can be seen as the ratio of the resonant frequency to quality factor. A higher value for Q means a more narrow bandwidth, which we want in many application.

Explanation: ALC stands for Automatic Level Control. It is a technology that is used for automatic control of output power.

Explanation: In amplitude modulated system, amplitude of the carrier wave is varied in proportion to the amplitude of the original message wave which is to be transmitted. For high level amplitude modulation, power amplifiers are not required and modulating amplifiers is used to give power to sidebands.

Explanation: Single side band suppressed carrier modulation technique suppresses the carrier and transmits either of the two sidebands. Thus, this not only reduces the power consumed but also reduces the bandwidth. SSB-SC technique requires a DSB-SC to be passed through a bandpass filter.

Explanation: Frequency modulated system can be produced either by direct ways or indirect ways. Armstrong method comes under indirect method. Direct FM modulator is generally used to vary the frequency of carrier oscillator, thus being known as frequency discrimination method, while indirect FM modulator varies the phase of carrier oscillator, thus being called phase discrimination method.

Explanation: Frequency modulated system can be produced either by direct ways or indirect ways. Armstrong method comes under indirect method. Direct FM modulator is generally used to vary the frequency of carrier oscillator, thus being known as frequency discrimination method, while indirect FM modulator varies the phase of carrier oscillator, thus being called phase discrimination method.