Q. If Pk be the probability of the message to be received or transmitted, then the amount of information (Ik) associated, in bits, will be

View solution

Q. The ratio given by below equation for 100% amplitude modulation with identical total transmitted power (mf is modulation index of FM) is

View solution

Q. The power density spectrum of noise voltage at the input of a network is Sni and that at the output of the network is Sno. If transfer function of network is H(ω), the corresponding noise figure is

View solution

Q. The modulation index of an AM wave is measured using a CRO. The waveform is as shown in figure, the modulation index is nearly

View solution

Q. On a smooth surface, the line of sight distance between transmitting antenna (height ht metres) and receiving antenna (height hr metres) is about

View solution

Q. Which stage generates RF carrier?

View solution

Q. If F(ω) is Fourier transform of f(t), then Fourier transform of f(t) cos² ωct is

View solution

Q. The circuit of figure give an output which is

View solution

Q. A carrier A cos ωct is modulated by a signal mt A cos ω₁t + m₂ A cos ω₂t + m₃ A cos ω₃t. The total modulated power is

View solution

Q. If an isotropic source is radiating power P in all directions, the electric field at a distance d from the source is proportional to

View solution

Q. Waveform shown in figure is that for

View solution

Q. Which of the following operation are performed on linear queues?

1. Testing a linear queue for underflow
2. Enqueue operation
3. Dequeue operation
4. Testing a linear queue for overflow

Select the correct answer using the codes given below the lists

View solution

Q. The colour subcarrier and sidebands produced by its modulation with the chrominance signals are accommodated in the standard channel width by the process of

View solution

Q. In FM signal with a modulation index mf is passed through a frequency tripler. The wave in the output of the tripler will have a modulation index of

View solution

Q. In colour TV receiver, varactor diode is used for

View solution

Q. The number of noise sources in a BJT are

View solution

Q. Energy content of atmospheric noise

View solution

Q. As the frequency increases, the absorption of ground wave by earth's surface

View solution

Q. The velocity of sound waves in air

View solution

Q. The range of a cordless telephone is about

View solution