# Electromagnetics & Transmission Lines - Electronic Engineering (MCQ) questions & answers

Dear Readers, Welcome to Electromagnetics & Transmission Lines multiple choice questions and answers with explanation. These objective type Electromagnetics & Transmission Lines questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma.

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1)   The constant x-circles of Smith chart becomes smaller due to increase in the value of 'x' from ______
- Published on 05 Oct 15

a. 0 to π
b. 0 to 2π
c. 0 to π /2
d. 0 to ∞
 Answer  Explanation  Related Ques ANSWER: 0 to ∞ Explanation: No explanation is available for this question!

2)   According to Smith diagram, where should be the position of reflection coefficient value for a unity circle with unity radius?
- Published on 05 Oct 15

a. On or inside the circle
b. Outside the circle
c. Both a and b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: On or inside the circle Explanation: No explanation is available for this question!

3)   If the quarter line is short-circuited, then it acts as _______
- Published on 05 Oct 15

a. Conductor
b. Insulator
c. Semiconductor
d. Power regulator
 Answer  Explanation  Related Ques ANSWER: Insulator Explanation: No explanation is available for this question!

4)   After what wavelength does the nature of graph get reversed for the input impedance of open-circuited line?
- Published on 05 Oct 15

a. λ/2
b. λ/4
c. λ/8
d. λ/16
 Answer  Explanation  Related Ques ANSWER: λ/4 Explanation: No explanation is available for this question!

5)   What is the phase variation range for reflection coefficient in the transmission lines?
- Published on 05 Oct 15

a. 0° to 90°
b. 90° to 150°
c. 0° to 180°
d. 90° to 360°
 Answer  Explanation  Related Ques ANSWER: 0° to 180° Explanation: No explanation is available for this question!

6)   Which lossless element is inserted between source and load in addition to an ideal transformer in order to reduce the effect of reflection loss phenomenon by image matching?
- Published on 05 Oct 15

a. Amplitude shifter
b. Phase shifter
c. Frequency divider
d. Voltage divider
 Answer  Explanation  Related Ques ANSWER: Phase shifter Explanation: No explanation is available for this question!

7)   For a transmission line with propagation constant γ = 0.650 + j 2.55, what will be the value of phase velocity for 1 kHz frequency?
- Published on 05 Oct 15

a. 1.18 x 103 km/sec
b. 1.50 x 103 km/sec
c. 2.46 x 103 km/sec
d. 4.58 x 103 km/sec
 Answer  Explanation  Related Ques ANSWER: 2.46 x 103 km/sec Explanation: No explanation is available for this question!

8)   What would be the depth of penetration for copper at 2 MHz frequency with σ = 5.8 x 107?
- Published on 05 Oct 15

a. 46.72 μm
b. 56.90 μm
c. 66.08 μm
d. 76.34 μm
 Answer  Explanation  Related Ques ANSWER: 46.72 μm Explanation: No explanation is available for this question!

9)   The ratio of magnitudes of electric field intensity to the magnetic field intensity is regarded as ________
- Published on 05 Oct 15

a. Intrinsic Impedance
b. Characteristic Impedance
c. Both a and b
d. None of the above
 Answer  Explanation  Related Ques ANSWER: Both a and b Explanation: No explanation is available for this question!

10)   How is the relation between energy transfer and the electric and magnetic fields specified?
- Published on 05 Oct 15

a. By Poynting theorem
b. By Stoke's theorem
c. By Helmholtz theorem
d. By Lagrange's theorem
 Answer  Explanation  Related Ques ANSWER: By Poynting theorem Explanation: No explanation is available for this question!

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