Test: Noise


20 Questions MCQ Test GATE ECE (Electronics) 2023 Mock Test Series | Test: Noise


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Attempt Test: Noise | 20 questions in 60 minutes | Mock test for Electronics and Communication Engineering (ECE) preparation | Free important questions MCQ to study GATE ECE (Electronics) 2023 Mock Test Series for Electronics and Communication Engineering (ECE) Exam | Download free PDF with solutions
QUESTION: 1

An amplifier has a standard spot noise figure F0  = 6.31 (8.0 dB). The amplifier, that is used to amplify the output of an antenna have antenna temperature of Ta = 180 K

Que: The effective input noise temperature of this amplifier is

Solution:

QUESTION: 2

An amplifier has a standard spot noise figure F0  = 6.31 (8.0 dB). The amplifier, that is used to amplify the output of an antenna have antenna temperature of T= 180 K

Que: The operating spot noise figure is

Solution:

QUESTION: 3

An amplifier has three stages for which Te1 = 200 K (first stage), Te2  = 450 K, and Te3 = 1000K (last stage). If the available power gain of the second stage is 5, what gain must the first stage have to guarantee an effective input noise temperature of 250 K ?

Solution:

QUESTION: 4

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

Solution:

= 7.98 or 9.0 dB

QUESTION: 5

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 ?

Solution:

QUESTION: 6

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 ?

Solution:

QUESTION: 7

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
 

Solution:

QUESTION: 8

An amplifier has three stages for which Te1 = 150 K (first stage), Te3 = 350 K, and Te3 = 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

Solution:

QUESTION: 9

An amplifier has three stages for which Te1 = 150 K (first stage), Te3 = 350 K, and Te3 = 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

Solution:

QUESTION: 10

An amplifier has three stages for which Te1 = 150 K (first stage), Te3 = 350 K, and Te3 = 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

Solution:

QUESTION: 11

Three network are cascaded. Available power gains are G1 = 8, G2 = 6 and G3 = 20. Respective input effective spot noise temperature are Te1 = 40 K, Te2 = 100 K and Te3 =180 K.

Solution:

QUESTION: 12

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

Solution:

QUESTION: 13

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

Solution:

 Sequence Te

QUESTION: 14

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 ?

Solution:

QUESTION: 15

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 

Solution:

QUESTION: 16

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

Solution:

QUESTION: 17

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

Solution:

= 13.67 or 11.4 dB

QUESTION: 18

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

Solution:

QUESTION: 19

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

Solution:

QUESTION: 20

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

Solution:

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