Description : _______ is more prevalent in analog signals that have steep slopes or whose amplitudes vary rapidly. A. Peak limiting B. Quantization noise C. Granular noise D. Slope overload
Last Answer : D. Slope overload
Description : Define slope overload noise and granular noise.
Last Answer : Slope overload noise is introduced due to the use of a step size delta is too small To follow some portions of the waveform with a step size. Granular noise results from using a step size that is too large in parts of the waveform having a small slope.
Description : The bounded Quantization error is also called__________. A. overload error B. overload noise C. granular error D. All of above
Last Answer : C. granular error
Description : Describe slope overload and granular noise in DM system
Last Answer : SLOPE-OVERLOAD DISTORTION: If the slope of the analog signal x(t) is much higher (steep) than that of the approximated signal xq(t) over a long duration then xq(t) will not follow x(t) ... , the step size should be as small as possible. However, this will increase slope-overload distortion.
Description : What is the reason why companding is employed in PCM systems? A. To overcome impulse noise in PCM receivers B. To allow amplitude limiting in the receivers C. To solve quantizing noise problem D. To protect small signals in PCM from quantizing distortion
Last Answer : D. To protect small signals in PCM from quantizing distortion
Description : Which causes a quantization noise in PCM system? A. Serial transmission errors B. The approximation of the quantized signal C. The synchronization between encoder and decoder D. Binary coding techniques
Last Answer : B. The approximation of the quantized signal
Last Answer : The approximation of the quantized signal
Description : What is the quantization signal-to-noise ratio if an 8-bit PCM code is used? A. 40 dB B. 50 dB C. 60 dB D. 65 dB
Last Answer : B. 50 dB
Description : Quantization noise is caused by A. binary coding techniques B. serial transmission errors C. the synchronization between encoder and decoder D. the approximation of the quantized signal
Last Answer : D. the approximation of the quantized signal
Description : _________ is the random and unpredictable electric signals from natural causes, both internal and external to the system. A. Interference B. Attenuation C. Distortion D. Noise
Last Answer : D. Noise
Description : What is the mixing process? A. Distortion caused by auroral propagation B. The combination of two signals to produce sum and difference frequencies. C. The elimination of noise in wideband receiver by phase differentiation D. The elimination of noise in a wideband receiver by phase comparison
Last Answer : B. The combination of two signals to produce sum and difference frequencies.
Description : The random and unpredictable electric signal from natural causes, both internal and external to the system is know as ________. A. Distortion B. Noise C. Attenuation D. Interference
Last Answer : B. Noise
Description : External noise fields are measured in terms of _______. A. rms values B. dc values C. average values D. peak values
Last Answer : D. peak values
Description : Define quantization error.
Last Answer : In A/D converter the smallest digital step is due to the LSB and it can be made smaller only by increasing the number of bits in the digital representation. This error is called quantization error.
Description : Companding helps in reducing __________ with respect to signal: (A) Interference (B) Signal overloading (C) Non linearity (D) Quantization noise
Last Answer : (D) Quantization noise
Description : Quantization noise can be reduced by ________ the number of levels. a) Decreasing b) Increasing c) Doubling d) Squaring
Last Answer : b) Increasing
Description : In communication systems, noise due to quantization error is a) Linear and signal dependent b) Non-linear and signal dependent c) Linear and signal independent at low frequencies only d) non -linear and signal dependent at low frequencies only
Last Answer : In communication systems, noise due to quantization error is Linear and signal dependent
Description : Quantization noise occurs in
Last Answer : Quantization noise occurs in PCM
Description : In a PCM system of telemetry, the quantization noise depends on: (1) The sampling rate and quantization level (2) The sampling rate only (3) The number of quantization level (4) Information provided is not sufficient
Last Answer : In a PCM system of telemetry, the quantization noise depends on: The number of quantization level.
Description : Refraction is the a. Bending of light waves b. Reflection of light waves c. Distortion of light waves d. Diffusion of light waves
Last Answer : a. Bending of light waves
Description : What distortion is not caused by transmission line characteristics? A. Phase distortion B. Pulse shape distortion C. Spacing bias distortion D. Amplitude distortion
Last Answer : C. Spacing bias distortion
Description : Which of the following is NOT an acoustical defect to be avoided in acoustical designs? A. Reverberation B. Flutter echo C. Distortion D. Sound concentration
Last Answer : A. Reverberation
Description : This is referred to a product of simultaneous frequency and amplitude modulation or a carrier frequency variation which produces unwanted distortion. A. Absorption modulation B. Simultaneous modulation C. Dynamic instability D. Series modulation
Last Answer : C. Dynamic instability
Description : Which one is not the basic electrical protection measures in the Philippine Electronics Code? A. Voltage/ current limiting and interrupting B. Undergrounding C. Grounding and bonding D. Shielding
Last Answer : B. Undergrounding
Description : What is meant by current limiting?
Last Answer : Current limiting refers to the ability of a regulator to prevent the load current from increasing above a preset value.
Description : ______ is a term in the test language for noise testing in telephone circuits that means a one-syllable word consisting of a consonant, a vowel, and another consonant. A. Logatom B. Nosfer C. Ore D. Belcore
Last Answer : A. Logatom
Description : What is meant by the term modulation index? A. The processor index. B. The ratio between the deviation of a frequency modulated signal and the modulating frequency. C. The FM signal-to-noise ratio. D. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency.
Last Answer : B. The ratio between the deviation of a frequency modulated signal and the modulating frequency.
Description : Alexander von Humboldt described for the first time (a) laws of limiting factor (b) species area relationships (c) population growth equation (d) ecological biodiversity.
Last Answer : (b) species area relationships
Description : Alexander Von Humbolt described for the first time: (1) Laws of limiting factor (2) Species area relationships (3) Population Growth equation (4) Ecological Biodiversity
Last Answer : (2) Species area relationships
Description : _________can impair a signal. A) Attenuation B) Distortion C) Noise D) All of theabove
Last Answer : All of theabove
Description : _______ is a typeof transmission impairment in which an outside sourcesuch as crosstalk corrupts asignal. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Noise
Description : ________ is a typeof transmission impairment in which the signal loses strength due to the different propagation speeds of each frequency that makes up the signal. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Distortion
Description : ________ is a typeof transmission impairment in which the signal loses strength due to theresistance of the transmission medium. A) Attenuation B) Distortion C) Noise D) Decibel
Last Answer : Attenuation
Description : Which of the following contributes to harmonics distortion in amplifiers? A) Positive feedback B) Presence of noise C) Defective active device D) Non linearity in active device.
Last Answer : D) Non linearity in active device.
Description : Popular measures of distortion is a. Squared error measure b. Absolute difference c. Noise d. Nats
Last Answer : a. Squared error measure
Description : The rate for a discrete source is simply the______. a. Entropy b. Loss c. Noise d. Distortion
Last Answer : a. Entropy
Description : ..................... is a type of transmission impairment in which the signal loses strength due to the resistance of the transmission medium. (A) Attenuation (B) Distortion (C) Noise (D) Decibel
Last Answer : (A) Attenuation
Description : A loud buzzing noise in an AC controller is probably caused by _____________. A. poor contact with the overload relay B. an incorrectly sized heater C. a broken shading coil D. abnormal starting current
Last Answer : Answer: C
Description : Which is the proper measurement of average power emitted by a pulsed laser? a. Energy x time b. Pulse energy x repetition rate c. Pulse energy / repetition rate d. Peak power x pulse length
Last Answer : b. Pulse energy x repetition rate
Description : In the American standard, the aural transmitter maximum radiated power is _____ of peak visual transmitter power. A. 10 % B. 30 % C. 20 % D. 40 %
Last Answer : C. 20 %
Description : In the European standard, the aurial transmitter maximum radiated power is ______ of peak visual transmitter power. A. 10% B. 30% C. 20% D. 40%
Last Answer : C. 20%
Description : Which of the following wavelengths where absorption of electromagnetic waves becomes peak due to vibrational resonances in the water vapor molecule? A. 1.35 cm and 1.7 mm B. 1.5 mm and 5 mm C. 1.35 dm and 1.7 cm D. 1.5 cm and 5mm
Last Answer : A. 1.35 cm and 1.7 mm
Description : Which of the following wavelengths where absorption of electromagnetic waves becomes peak due to vibrational resonances in the water vapor molecule? A. 1.35 cm and 1.7 mm B. 1.5 mm and 5mm C. 1.35 dm and 1.7cm D. 1.5 cm and 5 mm
Description : It is an average power of a radio transmitter supplied to the antenna transmission line taken during a long sufficient interval of time and compared with the lowest frequency encountered in the modulation ... operating conditions. A. Carrier power B. Rated power C. Mean power D. Peak envelop power
Last Answer : C. Mean power
Description : Referred to as an average power from the radio transmitter supplied to the antenna transmission line taken during one radio frequency cycle under no modulation. A. Carrier power B. Rated power C. Peak envelop power D. Mean power
Last Answer : A. Carrier power
Description : How does a SSB transmitter output power normally expressed? A. Average power B. In terms of peak envelop power C. In terms of peak-to-peak power D. Peak power
Last Answer : B. In terms of peak envelop power
Description : Average power of a radio transmitter supplied to the antenna transmission line by a transmitter during one radio frequency cycle taken under the condition of no modulation. A. Peak envelop power B. Rated power C. Carrier power D. Mean power
Last Answer : C. Carrier power
Description : Width measured in degrees of a major lobes between end of the love at which the relative power is one half (-3dB) its value from the peak of the lobe. A. Bandwidth B. Wavelength C. Radiation D. Beamwidth
Last Answer : D. Beamwidth
Description : The product of the power supplied to the antenna and its gain relative to a half-wave dipole in a given direction. A. Peak envelope power B. ERP C. Rated power D. Carrier power’
Last Answer : B. ERP
Description : A carrier signal has ______. A. Constant peak amplitude B. The information C. Frequency range 20-20000 Hz D. A varying amplitude
Last Answer : A. Constant peak amplitude