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This mock test of Waveguides - MCQ Test for Railways helps you for every Railways entrance exam.
This contains 20 Multiple Choice Questions for Railways Waveguides - MCQ Test (mcq) to study with solutions a complete question bank.
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QUESTION: 1

Consider a 150 m long air-filled hollow rectangular wave guide with cutoff frequency 6.5 GHz. If a shortpulse of 7.2 GHz is introduced into the input end of theguide, the time taken by the pulse to return the inputend is

Solution:

QUESTION: 2

In an air-filled rectangular waveguide the cutoff frequencies for TM_{11} and TE_{03} modes are both equal to 12 GHz.

Que: The dominant mode is

Solution:

QUESTION: 3

In an air-filled rectangular waveguide the cutoff frequencies for TM_{11} and TE_{03} modes are both equal to 12 GHz.

Que:At dominant mode the cutoff frequency is

Solution:

QUESTION: 4

For an air-filled rectangular waveguide given that

If the waveguide has cross-sectional dimension a = 6 cm and b = 3 cm, then the intrinsic impedance of this mode is

Solution:

QUESTION: 5

In an air-filled waveguide, a TE mode operating at 6 GHz has

Que: The cutoff frequency is

Solution:

QUESTION: 6

In an air-filled waveguide, a TE mode operating at 6 GHz has

Que: The intrinsic impedance is

Solution:

QUESTION: 7

Consider an air-filled rectangular wave guide with a = 2.286 cm and b = 1.016 cm. The y-component of the TE mode is

Que: The propagation constant γ is

Solution:

m = 2, n = 3

QUESTION: 8

Consider an air-filled rectangular wave guide with a = 2.286 cm and b = 1.016 cm. The y-component of the TE mode is

Que: The intrinsic impedance is

Solution:

QUESTION: 9

Consider a air-filled waveguide operating in the TE_{12} mode at a frequency 20% higher than the cutoff frequency.

Que: The phase velocity is

Solution:

v = c, f = 1.2 f_{c}

QUESTION: 10

Consider a air-filled waveguide operating in the TE_{12} mode at a frequency 20% higher than the cutoff frequency.

Que: The group velocity is

Solution:

QUESTION: 11

A rectangular waveguide is filled with a polyethylene ( ε_{r} = 2.25 ) and operates at 24 GHz. The cutoff frequency of a certain mode is 16 GHz. The intrinsic impedance of this mode is

Solution:

QUESTION: 12

own in fig. It has dielectric discontinuity as shown in fig. If the guide operate at 8 GHz in the dominant mode, the standing wave ratio is

Solution:

Since a > b, the dominant mode is TE_{10} .

QUESTION: 13

Consider the rectangular cavity as shown in fig.

Que: If a < b < c, the dominant mode is

Solution:

QUESTION: 14

Consider the rectangular cavity as shown in fig.

Que: If a > b > c, then the dominant mode is

Solution:

QUESTION: 15

Consider the rectangular cavity as shown in fig.

Que: If a = c > b, then the dominant mode is

Solution:

QUESTION: 16

The air filled cavity resonator has dimension a = 3 cm, b = 2 cm, c = 4 cm. The resonant frequency for the TM_{110 }mode is

Solution:

QUESTION: 17

A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25

Que: The range of frequencies over which single mode operation will occur is

Solution:

QUESTION: 18

A 6 cm x 4 cm rectangular wave guide is filled with dielectric of refractive index 1.25

Que: The range of frequencies, over which guide support both TE_{10 }and TE_{01} modes and no other, is

Solution:

3 GHz < f < 3.6 GHz

QUESTION: 19

Two identical rectangular waveguide are joined end to end where a = 2b. One guide is air filled and other is filled with a lossless dielectric of ε_{r}. it is found that up to a certain frequency single mode operation can be simultaneously ensured in both guide. For this frequency range, the maximum allowable value of ε_{r} is

Solution:

QUESTION: 20

A parallel-plate guide operates in the TEM mode only over the frequency range 0 < f < 3 GHz. The dielectric between the plates is teflon (ε_{r} = 2.1) .The maximum allowable plate separation b is

Solution:

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