Test: Electromagnetics - 1 - Electronics and Communication Engineering (ECE) MCQ

# Test: Electromagnetics - 1 - Electronics and Communication Engineering (ECE) MCQ

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## 15 Questions MCQ Test GATE ECE (Electronics) Mock Test Series 2025 - Test: Electromagnetics - 1

Test: Electromagnetics - 1 for Electronics and Communication Engineering (ECE) 2024 is part of GATE ECE (Electronics) Mock Test Series 2025 preparation. The Test: Electromagnetics - 1 questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Electromagnetics - 1 MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Electromagnetics - 1 below.
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Test: Electromagnetics - 1 - Question 1

### Assertion (A) : Smith chart is designed for λ/2length only. Reason (R) : For every λ/2 length, the load impedance appears to be same as Zin.

Test: Electromagnetics - 1 - Question 2

### Stub matching is used to match the load to characteristic impedance. Stub should be placed such that the admittance value at that point is

Detailed Solution for Test: Electromagnetics - 1 - Question 2

Stub matching is an effective technique in order to cancel out the reflectors when placed such that its reactive admittance value at the location of the stub is '0'. [Then it minimize losses]

Test: Electromagnetics - 1 - Question 3

### Match the following

Detailed Solution for Test: Electromagnetics - 1 - Question 3

Test: Electromagnetics - 1 - Question 4

The characteristic impedance of a lossless transmission line at is _________________ (ohms)

Detailed Solution for Test: Electromagnetics - 1 - Question 4

Test: Electromagnetics - 1 - Question 5

Assertion (A)    :    Magnetic field is continuous and always rotational.
Reason (R)    :

Detailed Solution for Test: Electromagnetics - 1 - Question 5

So assertion and reason both are correct and reason is the correct explanation for assertion.

Test: Electromagnetics - 1 - Question 6

An electric wave propagating through a lossless medium  is given by    :the phase constant β is given by

Detailed Solution for Test: Electromagnetics - 1 - Question 6

Test: Electromagnetics - 1 - Question 7

Assertion (A)    :    Polarization is always defined in terms of electric field orientation.
Reason (R)    :    Magnetic field is due to induced effect of electric field so we cannot measure it directly.

Detailed Solution for Test: Electromagnetics - 1 - Question 7

Assertion and reason are correct and reason is the correct explanation for assertion

Test: Electromagnetics - 1 - Question 8

Consider a wave which is having a phase velocity of 3x108m/s .Find the group ✓elocitv and the medium in which it is travelling

Detailed Solution for Test: Electromagnetics - 1 - Question 8

Test: Electromagnetics - 1 - Question 9

Phase difference between E and H in a high loss medium is _______________ (Degrees)

Detailed Solution for Test: Electromagnetics - 1 - Question 9

Test: Electromagnetics - 1 - Question 10

On the smith chart the location of the normalized load point is at 0.15λ, with reference to wavelength towards generator (WTG), scale operating wavelength is 4 cm. The location of first vmax from load is

Detailed Solution for Test: Electromagnetics - 1 - Question 10

Test: Electromagnetics - 1 - Question 11

Which of the following statements on a smith chart are correct?
1.    Moving in clockwise direction is analogous to moving towards generator.
2.    VSWR circles can be plotted on a smith chart.
3.    Smith chart is the superposition of locus of VSWR and reflection coefficients.
4.    To complete a distance of 0.75λ. it's enough to move 0.5λ. towards aenerator.

Detailed Solution for Test: Electromagnetics - 1 - Question 11

Smith chart is superposition of locus of resistance and reactance circles.

Test: Electromagnetics - 1 - Question 12

S-matrix for two port transmission line is given by  . The reflection
coefficient and the transmission power through port 1 for input power of 5 mW is

Detailed Solution for Test: Electromagnetics - 1 - Question 12

Test: Electromagnetics - 1 - Question 13

Match the following

Test: Electromagnetics - 1 - Question 14

For a waveguide component whose VSWR is 1.4 when the component is terminated with a matched load. The power to the matched load is 25 mW for an input power of 100 mW. The same results are obtained when component is reversed, then the S-matrix is

Detailed Solution for Test: Electromagnetics - 1 - Question 14

Test: Electromagnetics - 1 - Question 15

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

Detailed Solution for Test: Electromagnetics - 1 - Question 15

The propagation constant is given by γ = √(ZY), where Z is given by 9 and Y is 16. On substituting the given values, the propagation constant will be γ = √(ZY) = √(9 x 16) = 12 units.

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