Generator And Load Mismatches MCQ’s

Electronics & Communication Engineering RF & Microwave Circuit Design

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Generator And Load Mismatches”.

1. When a load ZL is matched to a line, the value of standing wave ratio is:
a) 1
b) 0
c) infinity
d) insufficient data to calculate SWR

2. The value of reflection co efficient when a transmission line is matched to the load is:
a) 1
b) 0
c) 0.707
d) cannot be determined

3. When a load is matched to a transmission line, the condition that is satisfied when matched is:
a) ZL=Z0
b) ZL=2Z00
c) ZL=Zin
d) ZL=2Zin

4. The value of transmission co efficient when a transmission line is matched to a load is:
a) 1
b) 0
c) 0.5
d) 0.707

5. If a transmission line is exited from a source of 4V at 1.2GHz frequency with a generator impedance of 4+j3 with a characteristic impedance of the transmission line 50Ω,then the power delivered to the load is:
a) 0.1 watt
b) 0.9 watt
c) 0.8 watt
d) 1watt

6. After conjugate impedance matching the input impedance used for matching after normalization was 1+j with the characteristic impedance of the transmission line being 100Ω, then the generator impedance must have been:
a) 100+100j
b) 1+j
c) 100-100j
d) 1-j

7. The expression for power delivered to a load , when a line is matched and supplied with a source of Vg with generator impedance Rg +jXg is:
a) 0.5*Vg2/Rg
b) 0.5*Vg2Rg/4(Rg2+ Xg2)
c) Rg/4(Rg2+ Xg2)
d) generator impedance does not cause any losses

8. If the generator impedance of a source connected to a transmission line is 50+j100Ω, then for conjugate matching to occur , the input impedance must be:
a) 50-j100 Ω
b) 50+100 Ω
c) 50 Ω
d) one of the mentioned

9. For a matched transmission line with a generator impedance of 50Ω and the source being 4V,1GHZ,then the maximum power delivered to the line is:
a) 0.4 watt
b) 0.04 watt
c) 0.5 watt
d) no power is delivered

10. If the power delivered to a load is 0.04w, then the normalized generator impedance if the source use is 4V at 2GHz and the generator impedance is real and characteristic impedance of the transmission line is 50Ω is:
a) 1 Ω
b) 1+j Ω
c) 1-j Ω
d) 50 Ω

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