GATE EC||ELCTROMAGNETIC FIELD THEORY|| TRANSMISSION LINE|| PYQS(2000-2025)

Last Updated :
Discuss
Comments

Question 1

Annotation-2025-09-20-014020


(GATE 2000|| EC || MCQ ||2 MARK)

  • Annotation-2025-09-20-014031


  • Annotation-2025-09-20-014042


  • Annotation-2025-09-20-014054


  • Annotation-2025-09-20-014105


Question 2

The magnitudes of the open-circuit and short-circuit input impedances of a transmission line are 100 Ω and 25 Ω, respectively. The characteristic impedance of the line is

(GATE 2000|| EC || MCQ ||1 MARK)

  • 25 Ω

  • 50 Ω

  • 75 Ω

  • 100 Ω

Question 3

A transmission line is distortionless if

(GATE 2001|| EC || MCQ ||1 MARK)


  • Annotation-2025-09-20-014739


  • RL = GC

  • LG = RC

  • RG = LC

Question 4

The VSWR can have any value between

(GATE 2002|| EC || MCQ ||1 MARK)

  • 0 and 1

  • —1 and +1

  • 0 and ∞

  • 1 and ∞

Question 5

In an impedance Smith chart, a clockwise movement along a constant resistance circle gives rise to

(GATE 2002|| EC || MCQ ||1 MARK)

  • a decrease in the value of reactance

  • an increase in the value of reactance

  • no change in the reactance value

  • no change in the impedance value

Question 6

A short-circuited stub is shunt connected to a transmission fine as shown in the figure. If Z 0 = 50 Ω, the admittance /seen at the junction of the stub and the transmission line is

Annotation-2025-09-20-032141


(GATE 2003|| EC || MCQ ||2 MARK)

  • (0.01–j0.02) mho

  • (0.02 –j0.01) mho

  • (0.04 –j0.02) mho

  • (0.02 - j0) mho

Question 7

Consider a 300 Ω, quarter-wave long (at 1 GHz) transmission line as shown in the figure. It is connected to a 10 V, 50 Ω source at one end and is left open circuited at the other end. The magnitude of the voltage at the open circuit end of the line is

Annotation-2025-09-20-032535

(GATE 2004|| EC || MCQ ||2 MARK)

  • 10 V

  • 5V

  • 60 V

  • 60/7 V

Question 8

A lossless transmission line is terminated in a load which reflects a part of the incident power. The measured VSWR is 2. The percentage of the power that is reflected back is

(GATE 2004|| EC || MCQ ||2 MARK)

  • 57.73

  • 33.33

  • 0.11

  • 11.11

Question 9

Consider an impedance Z = R + jX marked with point P in an impedance Smith chart as shown in the figure. The movement from point P along a constant resistance circle in the clockwise direction by an angle 45° is equivalent to

Annotation-2025-09-20-033214


(GATE 2004|| EC || MCQ ||2 MARK)

  • adding an inductance in series with Z

  • adding a capacitance in series with Z

  • adding an inductance in shunt across Z

  • adding a capacitance in shunt across Z

Question 10

Characteristic impedance of a transmission line is 50 Ω.Input impedance of the open-circuited line is 100 + j150Ω. When the transmission line is short-circuited, then value of the input impedance will be

(GATE 2005|| EC || MCQ ||2 MARK)

  • 50 Ω

  • 100 + j150 Ω

  • 7.69 + j11.54 Ω

  • 7.69 -j11.54 Ω

Tags:
GATE

There are 16 questions to complete.

Take a part in the ongoing discussion