Description : The width of the vertical sync pulse in the Philippine TV system is
Last Answer : 3H
Description : The number of frames per second in the Philippine TV system is
Last Answer : 30
Last Answer : . 30
Description : Pulse width modulation may be generated:
Last Answer : with a monostable multivibrator
Description : A pulse modulation technique as the width of a constant amplitude pulse is varied proportional to the amplitude of the analog signal at the time the signal is sampled.
Last Answer : PWM, PLM, PDM
Description : In the Philippine color television system, the intercarrier frequency, in MHz, is
Last Answer : 4.5
Description : The channel spacing in the Philippine FM broadcast standards
Last Answer : 800 kHz
Description : The channel spacing in the Philippine FM broadcast standards.
Description : The hue of color sync phase is:
Last Answer : yellow green
Description : The upper pulse rate and information carrying capacity of a cable is limited by:
Last Answer : modal dispersion
Description : Pulse – amplitude modulation signals are multiplexed by using
Last Answer : FET switches
Description : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : The vertical field-scanning frequency is ______ Hz
Last Answer : 60
Description : What circuit in the TV receiver is used to develop the high voltage needed to operate the picture tube?
Last Answer : Horizontal output
Description : A 4.5-MHz signal which is equal to the difference between the picture and sound RF carrier frequencies in a 6-MHz TV channel.
Last Answer : Intercarrier frequencY
Description : The total bandwidth of an NTSC TV signal is:
Last Answer : . 6 MHz
Description : The sound IF in a TV receiver is
Last Answer : 41.25 MHz
Last Answer : 6 MHz
Description : In a TV receiver the raster is normal but there is no sound and quality of picture is poor. The defective part is
Last Answer : AGC, video IF amplifier, RF amplifier
Description : To avoid objectionable noise in a microwave TV link, the SNR should be about:
Last Answer : 25 or more
Description : In a TV studio the illuminance is about:
Last Answer : 1000 lux
Description : A system where the modulated RF picture and sound carrier signals are distributed in a cable network, instead of wireless system.
Last Answer : CATV
Description : What distinguishes digital radio systems from conventional analog communications system?
Last Answer : the nature of the modulating signal
Description : For the 16-PSK and a transmission system with a 10kHz bandwidth, determine the maximum bit rate
Last Answer : 40,000 bps
Description : It is a system where the digital signals are placed directly on the coaxial cable.
Last Answer : Baseband
Description : Ethernet is baseband transmission system designed by _____
Last Answer : Robert Metcalfe and David Boggs
Description : It is the symmetrical expectation of the bit error rate in the system.
Last Answer : probability of errors
Description : The magnetic field of an antenna is perpendicular to the earth. The antenna’s polarization ___
Last Answer : is horizontal
Description : It is the ratio of the power density radiated in a particular direction to the power density radiated to the same point by a reference antenna, assuming both antennas are radiating the same amount of power
Last Answer : directive gain
Description : The property of interchangeability for the transmitting and receiving operations is known as ____
Last Answer : reciprocity
Description : The fields surrounding the antenna do not collapse their energy back into the antenna but rather radiate it out in space
Last Answer : radiation field
Description : It is the ratio of the radiated to the reflected energy:
Last Answer : Radiation efficiency
Description : It is the resistance that, if it replaced the antenna, would dissipate exactly the same amount of power that the antenna radiates
Last Answer : . Radiation resistance
Description : Plots of field strength or power density with respect to the value at a reference point.
Last Answer : relative radiation pattern
Description : The radiation pattern plotted in terms of electric field strength or power density
Last Answer : absolute radiation pattern
Description : The line bisecting the major lobe, or pointing from the center of the antenna in the direction of maximum radiation is called _____
Last Answer : line of shoot
Description : A special type of transmission line that consist of conducting metallic tube through which high frequency electromagnetic energy is propagated
Last Answer : waveguide
Description : If energy is applied at the geometrical center of antenna, the antenna is said to be ___
Last Answer : center-fed
Description : The radiation pattern of collinear and a broadside antenna is __
Last Answer : bidirectional
Description : Hertz antenna are predominantly used with frequencies above
Last Answer : 2MHz
Description : The point on the antenna where the transmission line is connected is called _____
Last Answer : feedpoint
Description : The discone antenna is
Last Answer : useful as a UHF receiving antenna
Description : It is the same with directive gain except that the total power fed to the antenna is used and the antenna efficiency is taken into account.
Last Answer : power gain
Description : ____ is a process-to-process protocol that adds only port addresses, checksum error control, and length information to the data from the upper layer.
Last Answer : UDP
Description : ______ are special-interest groups that quickly test, evaluate, and standardize new technologies
Last Answer : Forums
Description : _______ refers to the structure or format of the data, meaning the order in which they are presented.
Last Answer : Semantics
Description : ________ defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation.
Last Answer : syntax
Description : The effect of a large magnitude of the numerical aperture.
Last Answer : The amount of external light the fiber will accept is greater