Test: Noise - Electronics and Communication Engineering (ECE) MCQ

An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.

Que: The standard spot noise figure of amplifier is

An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.

Que: If a matched attenuator with a loss of 3.2 dB isplaced between the source and the amplifier's input,what is the operating spot noise figure of the attenuator's amplifier cascade if the attenuator's physicaltemperature is 290 K ?

An amplifier has an operating spot noise figure of 10 dB when driven by a source of effective noise temperature 225 K.

Que: In previous question what is the standard spot noisefigure of the cascade ?

Omega Electronics sells a microwave receiver

(A) having an operating spot noise figure of 10 dB when driven by a source with effective noise temperature 130 K Digilink

(B) sells a receiver with a standard spot noise figure of 6 dB. Microtronics

(C) sells a receiver with standard spot noise figure of 8 dB when driven by a source with effective noise temperature 190 K. The best receiver to purchase is
 

An amplifier has three stages for which T_e1 = 150 K (first stage), T_e3 = 350 K, and T_e3 = 600 K (output stage). Available power gain of the first stage is 10 and overall input effective noise temperature is 190 K

Que: The available power gain of the second stage is

An amplifier has three stages for which T_e1 = 150 K (first stage), T_e3 = 350 K, and T_e3 = 600 K (output stage). Available power gain of the first stage is 10 and overall input effective noise temperature is 190 K

Que: The cascade's standard spot noise figure is

An amplifier has three stages for which T_e1 = 150 K (first stage), T_e3 = 350 K, and T_e3 = 600 K (output stage). Available power gain of the first stage is 10 and overall input effective noise temperature is 190 K

Que: What is the cascade's operating spot noise figure when used with a source of noise temperature Ts = 50 K

Three network are cascaded. Available power gains are G₁ = 8, G₂ = 6 and G₃ = 20. Respective input effective spot noise temperature are T_e1 = 40 K, T_e2 = 100 K and T_e3 =180 K.

Three identical amplifier, each having a spot effective input noise temperature of 125 K and available power G are cascaded. The overall spot effective input noise temperature of the cascade is 155 K. The G is

Three amplifier that may be connected in any order in a cascade are defined as follows:

The sequence of connection that will give the lowest overall effective input noise temperature for the cascade is

What is the maximum average effective input noise temperature that an amplifier can have if its average standard noise figure is to not exceed 1.7 ?

An amplifier has an average standard noise figure of 2.0 dB and an average operating noise figure of 6.5 dB when used with a source of average effective source temperature     The   is 

An antenna with average noise temperature 60 K connects to a receiver through various microwave elements that can be modeled as an impedance matched attenuator with an overall loss of 2.4 dB and a physical temperatures of 275 K. The overall system noise temperature of the receiver 

Que: The average effective input noise temperature of the receiver is

An antenna with average noise temperature 60 K connects to a receiver through various microwave elements that can be modeled as an impedance matched attenuator with an overall loss of 2.4 dB and a physical temperatures of 275 K. The overall system noise temperature of the receiver  

Que: The average operating noise figure of the attenuator-receiver cascade is

If receiver has an available power gain of 110 dB and a noise band width of 10 MHz, the available output noise power of receiver is

If antenna attenuator cascade is considered as a noise source, its average effective noise temperature is

An amplifier when used with a source of average oise temperature 60 K, has an average operating noise figure of 5.
Que: The T_e is