MCQs on Impedance
Q: What is the value of negative sequence impedance?
- 1
- Z
- Same as positive sequence
- infinity
Answer: (3) Same as positive sequence
Q: The standing wave ratio is 4 for a transmission line of 75 ohms. What is the value of the minimum impedance?
- 75
- 300
- 18.75
- 150
Answer: (3) 18.75
Q: A transmission line has a voltage of 24 V and a conduction current of 1.2 A. What will its receiving impedance?
- 25.2
- 22.8
- 28.8
- 20
Answer: (4) 20
Q: What is the value of the characteristic impedance of a transmission line with impedance and admittance of 16 and 9?
- 25
- 1.33
- 0.75
- 7
Answer: (2) 1.33
Q: The propagation constant of a transmission line with impedance and admittance of 9 and 16, respectively is
- 25
- 144
- 12
- 7
Answer: (c) 12
Q: What is the value of input impedance of a quarter-wave line 50 ohm and the load impedance of 20 ohms?
- 50
- 20
- 1000
- 125
Answer: (4) 125
Q: The value of input impedance for a matched line will be equal to
- Load impedance
- Characteristic impedance
- Output impedance
- Zero
Answer: (2) Characteristic impedance
Q: 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
- ⅕
- 5
- 10
- 25
Answer: (2) 5
Q: The maximum impedance of a transmission line 50 ohm and the standing wave ratio of 2.5 is
- 20
- 125
- 200
- 75
Answer: (3) 125
Q: What is the normally chosen value of the characteristic impedance of a transmission line?
- 50
- 75
- 50 or 75
- 100
Answer: (3) 50 or 75