Description : The time it takes a light induced carrier travel across the depletion region of the semiconductor. ∙ A. dispersion ∙ B. response time ∙ C. irradiance ∙ D. transit time
Last Answer : D. transit time
Description : The modulated picture carrier wave includes the composite video signal as the:
Last Answer : Symmetric envelope of amplitude variations
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 : 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 bandwidth required for a modulated carrier depends on:
Last Answer : the baseband frequency range
Description : If the carrier of a 100 percent modulated AM wave is suppressed, the percentage power saving will be
Last Answer : 50
Description : A carrier recovery is needed with:
Last Answer : DPSK
Description : Inhibition of thromboxane synthesis by aspirin in platelets lasts for 5-7 days because: A. Aspirin persists in the body for 5-7 days B. Aspirin induced depletion of arachidonic acid lasts 5-7 ... 5-7 days D. Platelets cannot generate fresh thromboxane synthetase and their turnover time is 5-7 days
Last Answer : D. Platelets cannot generate fresh thromboxane synthetase and their turnover time is 5-7 days
Description : The time it takes to transmit one TDM frame is called ______
Last Answer : Frame time
Description : At what frequency compared to the cutoff frequency of a waveguide will the wavefronts be reflected back and forth across the guide (setting up standing waves) and no energy
Last Answer : UHF receiving antenna
Description : As EM waves travel in free space they get:
Last Answer : attenuated
Description : The potential difference set up across the depletion region is called (a) Absolute potential (b) neutral potential (c) reverse potential (d) potential barrier
Last Answer : (d) potential barrier
Description : It is a result of photons of light that are absorbed by the atoms of the glass core molecule
Last Answer : infrared absorption
Description : It is analogous to power dissipation to copper cables, impurities in the fiber absorb the light and covert it to heaT
Last Answer : absorption loss
Description : The maximum angle in which external light rays may strike the air/glass interface and still propagate down the fiber.
Last Answer : Acceptance cone half-angle
Description : Laser light is very bright because it is:
Last Answer : coherent
Description : Range of wavelength of visible light.
Last Answer : 390 nm to 770 nm
Description : A popular light wavelength fiber-optic cable is
Last Answer : 1.3 micrometer
Description : “When visible light of high frequency electromagnetic radiation illuminates a metallic surface, electrons are emitted”
Last Answer : Plank’s law
Description : The minimum optical power a light detector can receive and still produce a usable electrical output signal.
Last Answer : light sensitivity
Description : The term responsivity as it applies to a light detector is best described as.
Last Answer : the ratio of the diode output current to the input optical power
Description : As light is coupled in a multiport deflective device, the power is reduced by:
Last Answer : 0.5 dB
Description : They wrote a paper describing how it was possible to use stimulated emission for amplifying light waves (laser) as well as microwaves (maser).
Last Answer : Charles Townes and Arthur Schawlow
Description : They experimented with light transmission cables through bundle of fibers and lead to the development of flexible fiberscope
Last Answer : Van Heel, Hopkins and Kapany
Description : Of the following man-made disasters, which is socially induced? (1) Debris Avalanche (2) Salt Water Intrusion (3) Arson (4) Ozone depletion
Last Answer : (3) Arson Explanation: Arson is the crime of intentionally and maliciously setting lire to buildings, wild land areas, vehicles or other property with the intent to cause damage. Distinct from ... and natural wildfires, it is considered to be a man-made disaster which is socially induced.
Description : Of the following man-made disasters, which is socially induced ? (1) Debris Avalanche (2) Salt Water Intrusion (3) Arson (4) Ozone depletion
Last Answer : Arson
Description : Variation of biphase that is used for encoding SMPTE time code data and for recording on video tapes
Last Answer : Biphase – M
Description : The PCM code for each channel occupies a fixed time slot called:
Last Answer : Epoch
Description : It is the procedure used to decide which device has the permission to transmit at any given time.
Last Answer : Line control
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 : Used for transmission of PCM encoded time – division multiplexed digital signal.
Last Answer : T carriers
Description : Category of data transmission if the binary pulse is maintained for the entire bit time?
Last Answer : Return to zero
Description : In a ______ handoff, a mobile station can communicate with two base stations at the same time
Last Answer : . soft
Description : In the ________ traffic model, the rate of the data flow changes in time, with the changes smooth instead of sudden and sharp.
Last Answer : variable bit rate
Description : To prevent _________, we can timestamp the packets and separate the arrival time from the playback time
Last Answer : jitter
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