# MCQs on Impedance

MCQs on Impedance

Q1: What is the value of input impedance of a quarter-wave line 50 ohm and the load impedance of 20 ohms?

1. 50
2. 20
3. 1000
4. 125

Q2: The value of input impedance for a matched line will be equal to

2. Characteristic impedance
3. Output impedance
4. Zero

Q3: What is the ratio of  characteristic impedance to the input impedance if the ratio of load voltage to the input voltage is given as 5

1. 5
2. 10
3. 25

Q4: The maximum impedance of a transmission line 50 ohm and the standing wave ratio of 2.5 is

1. 20
2. 125
3. 200
4. 75

Q5: What is the normally chosen value of the characteristic impedance of a transmission line?

1. 50
2. 75
3. 50 or 75
4. 100

Q6: What is the value of negative sequence impedance?

1. 1
2. Z
3. Same as positive sequence
4. infinity

Answer: (c) Same as positive sequence

Q7: The standing wave ratio is 4 for a transmission line of 75 ohms. What is the value of the minimum impedance?

1. 75
2. 300
3. 18.75
4. 150

Q8: A transmission line has a voltage of 24 V and a conduction current of 1.2 A. What will its receiving impedance?

1. 25.2
2. 22.8
3. 28.8
4. 20

Q9: What is the value of the characteristic impedance of a transmission line with impedance and admittance of 16 and 9?

1. 25
2. 1.33
3. 0.75
4. 7

Q10: The propagation constant of a transmission line with impedance and admittance of 9 and 16, respectively is

1. 25
2. 144
3. 12
4. 7