The process of increasing the strength of a signal using an electric circuit is called ________________.

Modulation is the process of superposing _______________.

The device which is a combination of a receiver and a transmitter is ___________________.

The maximum carrier swing allowed in frequency modulation is ________________.

The resting frequency of the FM transmitter is 98.5MHz. The allowed minimum and maximum frequency on either side of the center frequency are respectively_____________.

Assertion: Television signals are received through sky-wave propagation.
Reason: The ionosphere reflects electromagnetic waves of frequencies greater then a certain critical frequency.
Codes:
(a) Assertion and Reason are correct and Reason is the correct explanation of Assertion.
(b) Assertion and Reason are true but Reason is the false explanation of the Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is false

(a) Ground wave propagation - Surface waves
(b) Sky wave propagation - Antenna
(c) Space wave propagation - 50 MHz
(d) Skip distance - No reception

Choose the correct statements
I) Carrier signal does not have information.
II) Carrier wave usually have a much higher frequency.
III) Carrier signal is used ot carry the baseband signal.
IV) Carrier signal cannot be transmuted to long distance with less attenuation.
(a) I, II and III only
(b) I and II only
(c) I and III only
(d) I, II, III and IV

Choose the Incorrect statements
(a) Input transducer converts variations in physical quantity.
(b) The electrical equivalent of the original information is called the baseband signal
(c) Transducer converts electrical energy into sound energy
(d) Microphone is an example of transducer.

Give the factors that are responsible for transmission impairments.

Distinguish between wireline and wireless communication? Specify the range of electromagnetic waves in which it is used.

Write the advantages of PM?

Define bandwidth of transmission system.

What is transducer?

Write the function of Repeater.

A transmitting antenna has a height of 40 m and the height of the receiving antenna is 30 m. What is the maximum distance between them for line-of-sight communication? The radius of the earth is 6.4 × 10⁶ m.

Explain the ampitude modulation with necessary diagrams.

Explain the basic elements of communication system with the necessary block diagram.

What are the advantages and Limitations of FM?

What is RADAR? Explain its function. State its applications