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

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

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

which of the following logic circuits is the fastest

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

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

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

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

Piezoelectricity principle is applied in one of the following

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

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

RJ45 is used for.

What is the most common fiber of the cable

What is the function of a transducer

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

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

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

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

What is the SI unit of thermodynamic temperature

Relative dialectic strength of gases tend with increasing molecular weight

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

Loudness of sound proportional to the square of

What is the maximum frequency which the human ear can hear

Electromagnetic waves are refracted when they

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

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

Wave propagation in perfect dialectric occurs

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

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

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

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

The particle inside the nucleus is called

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

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

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

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

____ is a scaler quantity

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

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

The polarization of dialectric materials results in

Polarization of an electromagnetic wave is

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?

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

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

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

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

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

A specific band of frequencies allocated to a particular service

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 difference between the highest and lowest frequencies contain in the information

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

Noise can be reduced by

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

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

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

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

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

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

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

The core of the fiber-optic cable is surrounded by

The electromagnetic waves produced primarily by heat are called

Another name for signals in the HF range is

Which color has the shortest wavelength of light

Electronic communications was discovered in which century?

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

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

Random interference to transmitted signals is called

The communication medium causes the signal to be

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

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

How many pins comprise the RS232C

In a radio receiver, noise is generally developed at

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

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

What is the light source typically used in multimode optical fiber

which of the following is a unit of information

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

GSM has a fixed bit rate of

bluetooth operates in what frequency

Simultaneous two-way communicatipns is called

A display of signal amplitude versus frequency is called

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

a signal that repeats at a uniform rate

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

Are voltage or current that change in discrete steps or levels

A modem converts

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

Overmodulation results in

Demodulation is done in

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

recovering information from a carrier is known as

radio signals are made up of

electromagnetic waves produced primarily by heat are called

What does BIOS mean

What is FTTH means

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

Which of the following is NOT a non volatile memory

What is NOT a programming language

MS-DOS is a/an ___ software