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This mock test of Electromagnetics - MCQ Test 2 for Electronics and Communication Engineering (ECE) helps you for every Electronics and Communication Engineering (ECE) entrance exam.
This contains 20 Multiple Choice Questions for Electronics and Communication Engineering (ECE) Electromagnetics - MCQ Test 2 (mcq) to study with solutions a complete question bank.
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QUESTION: 1

The locus of the resistance 50 Q such that Zo=50Ω for a constructing a smith chart is

Solution:

Radius of the normalized resistance, Centre =

Radius = 1/2 and Centre = (1/2, 0)

QUESTION: 2

A distortion less transmission line hasZ_{0} = 50Ω,α = 10mNP/m,u = 0.167C (C = 3x 10^{8}m/s'), then R and L of transmission line are

Solution:

QUESTION: 3

If PSWR is power standing wave ratio, then VSWR and PSWR corresponding to r = 0.5∠45^{0} is

Solution:

QUESTION: 4

Z_{0} = 600Ω, VSWR = 1.5, the distance at which first maximum occurs is 20cm from the load. If the operating frequency of the transmission line is 300 MHz, then the reflection coefficient is given by

Solution:

For first maximum, n = 0

QUESTION: 5

For the transmission line shown below, the voltage which appears at the load

Solution:

All appears at the load. Including this there will some part which is reflected back From the load we should include thisf.

appears at load.

QUESTION: 6

A transmission line having a characteristic impedance of 300fl is feeding a dipole antenna. Frequency of operation is 100 MHz and length of dipole antenna is 1.5m.

Q.

Magnitude of reflection coefficient on the line is

Solution:

QUESTION: 7

A transmission line having a characteristic impedance of 300fl is feeding a dipole antenna. Frequency of operation is 100 MHz and length of dipole antenna is 1.5m.

Q.

If Pout from the transmission line is 100 watts, then the power tramsmitted by the antenna is

Solution:

QUESTION: 8

Consider the impedance matching series

Q.

The load impedance Z_{L} is given by

Solution:

QUESTION: 9

Consider the impedance matching series

Q.

The reflection coefficient at the load end is

Solution:

QUESTION: 10

A uniform plane wave is incident normally on a dielectric interface with the current reflection coefficient, current transmission, current standing wave ration (ISWR) are

Solution:

QUESTION: 11

Match the following

Solution:

If the amplitudes are equal, then it is circularly polarized otherwise elliptical polarization.

QUESTION: 12

In air, a loss less transmission line of length 50 cm with L=10μH/mand C=40 pF/m is operated at 25 MHz. Its electrical path length is

Solution:

QUESTION: 13

A transmission line is lossless and is 25 m long. It is terminated with a load of z_{L} =40+j30Ω at a frequency of 10 MHz. The inductance and capacitance of the line are L - 300nH/m, C = 40pF/m.

Q.

Find β

Solution:

QUESTION: 14

A transmission line is lossless and is 25 m long. It is terminated with a load of z_{L} =40+j30Ω at a frequency of 10 MHz. The inductance and capacitance of the line are L - 300nH/m, C = 40pF/m.

Q.

Find the input impedance at the mid-point of the line.

Solution:

QUESTION: 15

then wave is said to be which one of the following,

Solution:

QUESTION: 16

An air filled rectangular wave guide has dimensions a = 2, b = 1 cm, the range of frequencies over which guide will operate in single mode is given by:

Solution:

single mode propagation means only TE|0 mode will propagate.

QUESTION: 17

For a rectangular waveguide of dimensions: a √3 × a (in cm) , if cut-off frequency of TE_{10} mode is 2GHz. What is the cut-off frequency for TM_{11} in waveguide?

Solution:

QUESTION: 18

If skin depth at 10 MHz for a conductor is 1/2 π meter then what is the phase velocity for this EM wave?

Solution:

QUESTION: 19

The potential distribution is given by V = 10y^{4} + 2x^{3}. If ε0 is permittivity of free space what is charge density (ρ) at (2, 0)

Solution:

QUESTION: 20

A short vertical grounded antenna is required to radiate at 1 MHz. The effective height of antenna is 302 meter then value of radiation resistance (approximately) is

Solution:

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