railway RRB JE (CBT I + CBT II) Mock Test 2024 Communication Systems Noise in Analog Communication System Noise Temperature and Noise Figure
Two resistors R1 and R2 (in ohms) at temperatures T1K and T2K respectively, are connected in series.
Their equivalent noise temperature is
1
T1 + T2
2
R1T1 + R2T2
3
(R1T1 + R2T2) / (R1R2)
4
(R1T1 + R2T2) / (R1 + R2)