ECE Board
Exam November 2000
Generally
referred to as the primary cause of atmospheric noise.
Lightning
ECE Board
Exam April 2000
Absence of
one of the following components in a parametric amplifier renders, this circuit
a low-noise amplifier.
Resistance
ECE Board
Exam November 1998
What is the
major cause of atmospheric or static noise?
Thunderstorm
ECE Board
Exacta April 1998
Where is the
noise generated that primarily determines the signal-to-noise ratio in a VHF
(150 MHz) marine-band receiver?
In the receiver front end
ECE Board
Exam November 1997
Extra-terrestrial
noise is observable at frequencies from
8 to 1.43 GHz.
ECE Board
Exam April 1997
________sets
a limit on the maximum capacity of a channel with a given noise level,
Shannon-Hartley theorem
ECE Board
Exam November 1996
Noise from
random acoustic or electric noise that has equal per cycle, over a specified
total frequency band.
Thermal noise White noise Gaussian noise
Board Exam
April 1998
Referred to
as the stage in the radio receiver that contributes most of the noise.
Mixer
Board Exam
November 1997
NOise caused
by the thermal agitation of electrons in resistance
Thermal noise
Johnson's noise
White noise
ECE Board
Exam April 1997
Industrial
noise frequency is between
5 to 160 MHz .
ECE Board
Exam March 1996
At what
power level does a I kHz tone cause zero interference (144 weighted)?
-90 dBm
ECE Board
Exam November 1997
Background
noise is the same as the following except
impulse noise.
ECE Board
Exam April 1997
Reference
noise temperature.
290 Kelvin
ECE board
exam November 1996
Noise
reduction system used for film sound in movie.
dolby
ECE Board
Exam March 1996
A receiver
connected to an antenna whose resistance is 50 ohms has an equivalent noise
resistance of 30 ohms. What is the receiver's noise temperature?
ECE Board
Exam April 1997
That is the
reference frequency of CCITT psophometric noise measurement?
800 Hz
ECE Board
Exam November 1997
atmospheric
noise is less severe at frequencies above audio level.
30 MHz
ECE Board
Exam November 1997
Two
resistors, 20 kilo ohms and 50 kilo ohms are at ambient temperature. Calculate
for bandwidth equal to 100 kHz, the thermal noise voltage for the two resistor
connected in parallel.
ECE Board
Exam March 1996
The
equivalent noise temperature of the amplifier is 25 K. What is the noise
figure?
ECE Board
Exam November 1997
nif stands
for..
noise improvement factor
ECE Board
Exam April 1997
Which does
not affect noise in a channel?
Quantizing level
ECE Board
Exam March 1996
The signal
in a channel is measured to be 23 dB while noise in the same channel is
measured to be 9 dB. The signal to noise
ratio therefore is
ECE Board Exam
March 1996 ..
What does
the noise weighting curve show?
The interfering effect of other frequencies
in a voice channel compared with a reference frequency of one kilohertz
ECE Board
Exam November 1997
The most
common unit of noise measurement in white noise voltage testing
NPR
ECE Board
Exam April 1997
The random
and unpredictable electric signals form natural causes, both internal and
external to the system is known as
Noise
ECE Board
Exam March 1996
The ratio of
the level of the modulated output of a transmitter under conditions of standard
test modulation to the level of the demodulated output with no modulation
applied both measured with the same bandwidth.
Residual noise level
ECE Board
Exam November 1997
A figure of
merit used to measure the performance of a radiation detector.
Noise equivalent power
ECE Board
Exam April 1997
The most
common unit of noise measurement in white noise testing
NPR
ECE Board
Exam March 1996
In
measuring noise in a voice channel at a -4 dB test point
level, the meter reads -70dBm (F1A weighted), convert the reading into pWp.
ECE Board
Exam April 1998
Considered
as the main source of an internal noise
Thermal agitation
ECE Board
Exam April 1997
Unit of
noise power of psophometer.
pWp
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