c.
thermal agitation of the electrons in the resistive device.
d.
inconsistencies in the composition of the resistive device.
7.
When comparing noise temperature measurements, it is necessary to use a standard noise temperature
reference. The standard noise temperature reference in Fahrenheit is
a.
17,.
c.
273.7,.
b.
62.6,.
d.
290.
8.
If the noise temperature of a resistor is measured on a centigrade scale, the temperature value must be
converted to the Kelvin scale before it can be used in the noise power formula. If a 35,, centigrade
measurement is converted to the Kelvin scale, the temperature becomes
a.
95 Kelvin.
c.
290, Kelvin.
b.
275 Kelvin.
d.
308, Kelvin.
9.
The noise power that is available across a resistor is determined by the
a.
frequency of the signal and the resistance of the resistor.
b.
temperature of the resistor and the frequency of the signal.
c.
bandwidth of the measuring system and the temperature of the resistor.
d.
resistance of the resistor and the bandwidth of the measuring system.
10.
Which of the following is the best receiver noise figure?
a.
3 db
c.
7 db
b.
5 db
d.
10 db
11.
If the noise output of a certain device is equal to the noise applied to the device, what is the device's noise
figure?
a.
1
c.
3
b.
2
d.
4
12.
When the noise contribution of a receiver is determined by the Y factor method, the Y factor is expressed
in
a.
volts.
c.
milliamperes.
b.
decibels.
d.
degrees Kelvin.
344 L4
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