WorksheetsEST 12
Total questions: 50
Worksheet time: 25mins
What is the period of a wave?
The number of degrees in tone cycle
The number of zero crossing in one cycle
The amplitude of the wave
The time required to complete one cycle
Is the total useful information processed or communicated over a specific amount of time
Baud rate
Bit rate
Information theory
Throughput
What is the approximate percentage of earth coverage of a geostationary satellite at zero degree elevation?
33.3%
45.2%
42.5%
30.5%
This refers to an area in the memory used for temporary storage of information on the basis of “Last in First out”.
Core
Register
Flag
Stack
What is a driven element of an antenna?
Always the rearmost element
Always the forward most element
The element fed by the transmission line
The element connected to the rotator
Which of the following term best described the overload distortion?
Peak limiting
Quantization noise
Granular noise
Slope distortion
What do you mean by the outward flow of and energy from any source in the form of radio waves?
Radiation
Emission
Encoding
Tracking
Refer to the deviation of the operating frequency of a crystal oscillator from its nominal value due to temperature variations.
Drift
Flash over
Frequency deviation
Deviation ratio
Find the product of the following binary number 100 to 101.
11000
10100
10010
11100
Which of the following is and impedance matching ration of coax balun?
2:8
1:2
4:1
2:1
Quantity that do not change when a beam of light enters on e medium to another.
Frequency
Wavelength
Direction
Speed
Which of the following described the very early standard that defines binary digits as space/mark line condition and voltage levels?
V.4
V.2
V.1
V.5
A form of single sideband emission where the degree of carrier suppression enable the carrier to be reconstituted and be used for demodulation.
Half carrier single sideband emission
Full carrier single sideband emission
Reduced carrier single sideband emission
Double sideband emission
An instrument for recording waveforms of audio frequency.
Oscilloscope
Phonoscope
Radioscope
Audioscope
How much is the required minimum power output of an international AM BC stations?
5 kW
30 kW
10 kW
50 kW
What is the equivalent of decimal 51 in binary?
111011
110011
111001
100011
100011
Iridium system
Plutonium system
Indium system
Gallium system
What do you call a circuit that controls the magnetron output?
Inverter
Impeller
Modulator
Converter
Known as the satellite transmitted signal form a satellite transponder to earth’s station.
Uplink
Down link
RHCP
Vertically polarized
Which of the following colors of light rays has the shortest wavelength?
Yellow
Violet
Red
Blue
Antenna which is not properly terminated
Isotropic
Non-resonant
Whip
Resonant
Term in communication which is referred, “to send out in all direction”.
Announce
Broadcast
Transmit
Media
At the ends of a half-wave antenna, what values of current and voltage exist compared to the remainder of the antenna?
Minimum voltage and minimum current
Equal voltage and current
Minimum voltage and maximum current
Maximum voltage and minimum current.
One of the following stands for SONET acronym in telecommunication
System optical network
Simple operation network
Synchronous optical network
System operating network
How can intermodulation interference between two transmitters in close proximity reduced or eliminated?
Through installing a band-pass filter in the antenna feed line
Through installing terminated circulator or ferrite isolator in the feed line of the transmitter and duplexer
By using a class C final amplifier with high driving power
By installing a low-pass filter in the antenna feed line
What propagation condition is usually indicated when a VHF signal is received from a station over 5000 miles away?
Moonbounce
D-layer absorption
Tropospheric ducting
Faraday rotation
In radio High frequency communications the higher the radio frequency the ______.
A. Higher it can
Higher it can reach
Shorter it can reach
Effect is null
Longer it can reach
The signal to noise ratio that is required for a satisfactory television reception.
. 30 dB
40 dB
10 dB
20 dB
What is meant by referring to electromagnetic waves as horizontally polarized?
The electric field is parallel to the earth
Both the electric and magnetic fields are vertical
Both the electric and magnetic fields are horizontal
The magnetic fields is parallel to the earth
What is emission F3F?
Facsimile
Modulated CW
RTTY
Television
How can receiver desensitizing be reduced?
Increase the receiver bandwidth
Ensure good RF shielding between the transmitter and receiver
Increase the transmitter audio gain
Decrease the receiver squelch, gain.
Circuit used to amplify the optical signal in fiber optics communications links.
Attenuator
Optical repeater
Optical amplifier
Generator
What do you call the single booster installed on the antenna dish of satellite receiver?
Low noise amplifier
Single amplifier
Noise amplifier
Rectifier
Term for the transmission of printed pictures by radio?
Facsimile
ACSSB
Xerography
Television
An interfering current in a telegraph or signaling channel due to telegraph or signaling current by another channel.
Crosstalk
Noise current
Crossfire
Intermodulation
Where is the noise generated that primarily determines the signal-to-noise ratio in a VHF (150 MHz) marine-band receiver?
In the ionosphere
In the receiver rear end
In the receiver front end
In the atmosphere
Known as the data transfer scheme that used handmaking principle.
Synchronous data transfer scheme
DMA data transfer scheme
Asynchronous data transfer scheme
Uninterrupted data transfer scheme
Type of modulation used in TV broadcast visual transmitter.
Pulse modulation
DSBFC
Vestigial sideband
SSBFC
A transmitter supplies 8 kW to the antenna when it is unmodulated, determine the total radiated power when modulated at 30%.
5 kW
20 kW
15 kW
8.36 kW
Best describe as an amplifier used in radio telephony.
Magnifier
Class B
Class C
Class A
The latest government regulation in the telecommunication which provides policy for the provision of local exchange carrier service.
E.O. 546
E.O. 109
Act 3948
E.O. 59
Referred to as the stage in the radio receiver that contributes most of the noise.
IF amplifier
Supply stage
Speaker
Mixer
The frequency tolerance of an AM radio broadcast station
200 Hz
2000 Hz
20 Hz
2 Hz
What are electromagnetic waves?
A wave consisting of two magnetic fields at right angles to each other
A wave consisting of an electric field and a magnetic field at right angles to each other.
Alternating currents in the core of an electromagnet
A wave consisting of two electric fields at right angles to each other
What is the frequency range of C-band?
10.95 to 14.5 GHz
27.5 to 31 GHz
3.4 to 6.424 GHz
1.53 to 2.7 GHz
Determine from the following the basic mode of transmission system in the public data network in which data are transferred from the source to the network and from the network to the destination in the frame format.
Voice mode
Asynchronous mode
Synchronous mode
Packet mode
Refers to a type of beam antenna which uses two or more straight elements arranged in line with each other.
Dipole antenna
Yagi antenna
Whip antenna
Rhombic antenna
What is a frequency discriminator?
A circuit for filtering two closely adjacent signals
A circuit for detecting FM signals
An FM generator
An automatic bandswitching circuit.
These are used to connect non-ISDN equipment of ISDN line.
Digipeaters
Terminal adapters
Local repeaters
Terminal repeaters
The executive branch of government in charge of policy making in the telecommunications.
National telecommunications commission
Telecommunications control bureau
Department of transportation and communications
Bureau of telecommunications
