A collection of one or more electronic devices or circuits that converts the original source information to a form more suitable for transmission over a particular transmission medium

Electronic communications was discovered in which century?

associated with the rapid and random movement of electrons within a conductor due to change in temperature

Polarization of an electromagnetic wave is

The main factor which differentiates a DE MOSFET from E-only MOSFET is the absence of:

recovering information from a carrier is known as

Another name for signals in the HF range is

Simultaneous two-way communicatipns is called

A modulation technique where the information signal is analog and the amplitude of the carrier is varied proportional to the information signal

GSM has a fixed bit rate of

A specific band of frequencies allocated to a particular service

Which stage of a DC power supply uses zener diode as the main component

Electromagnetic waves are refracted when they

Loudness of sound proportional to the square of

electromagnetic waves produced primarily by heat are called

If the power level of an amplifier reduces to one-half, the dB gain will fall by.

The _____ of a waveform consists of all the frequencies contain in the wave form and their respective amplitude plotted in the frequency domain

Signals in the 3 GHz to 30 GHz range and include the majority of the frequencies used for microwave and satellite radio communication systems.

The particle inside the nucleus is called

It is a solid transparent fiber of flass or polymer that carries an optical signal

It refers to a device that merely boosts a signal and passes it on

which of the following is a unit of information

If 1 g of matter could be converted entirely to energy, what would be the value of the energy to produce in kWh?

What is the maximum frequency which the human ear can hear

It is the high frequency sound that cannot be heard by human ear.

What do you call the nucleus a specific isotope of an element

bluetooth operates in what frequency

What is the light source typically used in multimode optical fiber

The absorption of radio waves by the atmosphere depends on which of the following

In a radio receiver, noise is generally developed at

Wave propagation in perfect dialectric occurs

Random interference to transmitted signals is called

In transmission line the ratio of reflected power to incident power is given by

The gate voltage in a FET at which the drain current Id becomes zero is called

The difference between the highest and lowest frequencies contain in the information

a signal that repeats at a uniform rate

A display of signal amplitude versus frequency is called

Steepness of the traveling waves in transmission line is attenuated by _____ of the line

If the amplitude of the modulating signal applied to a phase modulator is constant, the output signal will be

The operation of a fiber-optic cable is based on the principle of

What is the SI unit of thermodynamic temperature

The emission of electrons from matter by electromagnetic radiation of certain energy is

A form of amplitude modulation in which the carrier is transmitted at full power, but only one of the sidebands is transmitted

When the distance between two charges is doubled, the force between them will be equal to

The ____ occurs when oscillating mechanical stresses applied across a crystal lattice structure. Generated electrical oscillations in vice versa.

How many doped regions does a typical bipolar Junction transistor (BJT) have?

The process of translating a signal with or without modulation to a higher or lower frequency for processing is called

An amplifier with a feedback loop or path for energy to propagate from the output back to the input is.

Which of the following laws of electromagnetic theory is connected with the force experience by two loops of a wire carrying a current

Overmodulation results in

The process of changing one or more properties of the analog carrier in proportion with the information signal

Piezoelectricity principle is applied in one of the following

Are signals in the 0.3 THz to 300 THz range and are not generally referred to as radio waves. Used in heat seeking guidance systems, electronic photography, and astoronomy

The ratio of electric flux density to electric field intensity is called _____ of the medium

What is the most common fiber of the cable

what electrode in a junction transistor corresponds to the cathode in a vacuum tube?

The electromagnetic and electrostatic fields radiated by an antenna are out of phase by

Noise can be reduced by

What is the branch of physics that deals with the dynamic property of gases

Increasing the reverse bias on a varactor diode will cause its capacitance

For a perfect match between transmission line and load, the value of reflection coefficient should be

RJ45 is used for.

Any undesirable electrical energy that falls within the pass band of the signal

What is FTTH means

the most accurate type of test equipment used for measuring high power is the

MS-DOS is a/an ___ software

The first stage of the receiver of which primary functions are detecting, band limiting and amplifying the received RF signal

The basic reason why a full wave rectifier has twice the efficiency of a half wave rectifier is that

Which of the following is the usual geometric view factor for a black body

A plane electromagnetic wave travels in a dialectric medium of relative permitivity of 9. Relative to free space, what is the velocity of propagation in the dielectric?

Which of the following is NOT a non volatile memory

What is the function of a transducer

A modem converts

Is the depletion region in a junction died forms what part of capacitor

____ is a scaler quantity

Which color has the shortest wavelength of light

The electromagnetic waves produced primarily by heat are called

Half-duplex, one to many radios communication with two way no dial tone

Are voltage or current that change in discrete steps or levels

How many pins comprise the RS232C

A live room one whose interior finishing is such that reverbation time of sound is

The TV signal uses which type of modulation for picture and sound respectively?

What is NOT a programming language

Facebook, twitter, instagram and the like has web level of

which of the following logic circuits is the fastest

In 1885, he used a long wire as antenna and developed a practical radio system

the number of frames per second in the Philippine television system is

The physical relationship of gaseous system is treated by _______ of gases in which their properties are related to P, V and T of system

The polarization of dialectric materials results in

radio signals are made up of

Relative dialectic strength of gases tend with increasing molecular weight

The ratio of the peak modulating signal voltage to the peak carrier voltage is

The process of combining transmission from more than one source and then transmitting them over a common facility such as metallic or optical fiber cable or a radio frequency

Distortion of the modulating signal produces harmonics which cause an increase in the signal

Fundamental purpose is the transfer information from one electronic place to another

What does BIOS mean

Demodulation is done in

The core of the fiber-optic cable is surrounded by

The communication medium causes the signal to be