**1. What are the parameters of a dissipation-less line at radio frequencies?**

a) Resistance and capacitance

b) Inductance and conductance

c) Resistance and inductance

d) Capacitance and conductance

**Answer: b) Inductance and conductance**

Explanation: A dissipation-less line at radio frequencies primarily exhibits inductance (L) and conductance (G), with negligible resistance and capacitance.

**2. What are the characteristics of voltage and current on a dissipation-less line?**

a) Voltage and current are in phase

b) Voltage leads current by 90 degrees

c) Voltage lags current by 90 degrees

d) Voltage and current are out of phase randomly

**Answer: a) Voltage and current are in phase**

Explanation: In a dissipation-less line, voltage and current are in phase with each other due to the absence of resistive losses.

**3. What is the Standing Wave Ratio (SWR) a measure of?**

a) Efficiency of a transmission line

b) Propagation speed of electromagnetic waves

c) Mismatch in a transmission line

d) Signal attenuation in a transmission line

**Answer: c) Mismatch in a transmission line**

Explanation: SWR measures the degree of mismatch between the transmission line and the load impedance.

**4. What is the input impedance of an open circuit termination on a transmission line?**

a) Zero

b) Infinity

c) Depends on the frequency

d) Depends on the length of the line

**Answer: b) Infinity**

Explanation: An open circuit termination results in an infinite input impedance due to the absence of a current path.

**5. How is power measured on transmission lines?**

a) Directly by voltmeter and ammeter

b) By calculating the product of voltage and current

c) Through impedance matching

d) By measuring the phase angle between voltage and current

**Answer: b) By calculating the product of voltage and current**

Explanation: Power on transmission lines is calculated by multiplying the voltage and current, typically using a wattmeter.

**6. What type of transmission line is an eighth-wave line?**

a) Short-circuited line

b) Open-circuited line

c) Quarter-wave line

d) Half-wave line

**Answer: b) Open-circuited line**

Explanation: An eighth-wave line is an open-circuited transmission line that is a multiple of one-eighth wavelength long.

**7. What is the Smith chart used for in radio frequency engineering?**

a) Power measurement

b) Impedance matching

c) Wave propagation analysis

d) Voltage measurement

**Answer: b) Impedance matching**

Explanation: The Smith chart is a graphical tool used for impedance matching and analyzing transmission line problems.

**8. How can the Smith chart be utilized to solve transmission line problems?**

a) By directly measuring voltage and current

b) By plotting impedance values and performing calculations

c) By analyzing wave propagation speed

d) By calculating standing wave ratios

**Answer: b) By plotting impedance values and performing calculations**

Explanation: The Smith chart allows engineers to plot complex impedance values and perform calculations to solve transmission line problems.

**9. What is single stub matching used for in transmission lines?**

a) Impedance transformation

b) Voltage measurement

c) Power distribution

d) Current measurement

**Answer: a) Impedance transformation**

Explanation: Single stub matching is a technique used to transform the impedance seen at one point along a transmission line to a desired value.

**10. What is the purpose of double stub matching in radio frequency engineering?**

a) To increase power transmission efficiency

b) To decrease standing wave ratio

c) To achieve impedance matching

d) To eliminate voltage fluctuations

**Answer: c) To achieve impedance matching**

Explanation: Double stub matching is a method used to achieve impedance matching in transmission lines by adjusting the positions and lengths of two stubs.

**11. What is the primary characteristic of a quarter-wave line?**

a) Open circuit at one end

b) Short circuit at one end

c) Half the length of a half-wave line

d) Double the length of an eighth-wave line

**Answer: b) Short circuit at one end**

Explanation: A quarter-wave line is characterized by a short circuit at one end and an open circuit at the other end.

**12. In microstrip lines, where are the conductive traces usually located?**

a) Between two dielectric layers

b) Embedded within a dielectric substrate

c) Above a dielectric substrate

d) Below a dielectric substrate

**Answer: c) Above a dielectric substrate**

Explanation: In microstrip lines, the conductive traces are typically located above a dielectric substrate.

**13. What is the analysis method often used for microstrip lines?**

a) Transmission matrix analysis

b) Finite element method

c) Smith chart analysis

d) Moment method

**Answer: b) Finite element method**

Explanation: The finite element method is commonly used for the analysis of microstrip lines due to its versatility and accuracy.

**14. What does a half-wave line typically require at its termination points?**

a) Open circuit

b) Short circuit

c) Matching network

d) Variable resistor

**Answer: a) Open circuit**

Explanation: A half-wave line typically requires an open circuit at its termination points for proper operation.

**15. What property distinguishes a dissipation-less line from a typical transmission line?**

a) Higher power handling capacity

b) Lower propagation speed

c) Absence of resistive losses

d) Higher standing wave ratio

**Answer: c) Absence of resistive losses**

Explanation: The primary distinction of a dissipation-less line is the absence of resistive losses, leading to theoretically infinite propagation of signals without attenuation.