Microwave Engineering Questions and Answers – Circular Waveguide

This set of Microwave Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Circular Waveguide”.

1. In TE mode of a circular waveguide, E_Z=0. The wave equation is:
a) ∇²H_Z+k²H_Z=0
b) ∇²H_Z-k²H_Z=0
c) ∇²H_Z-H_Z=0
d) ∇²H_Z+H_Z=0
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2. Bessel’s differential equation for a circular waveguide is:
a) ρ²(d²R/ dρ²) + ρ(dR/dρ) + (ρ²kC²– n²) R=0
b) n²(d²R/ dρ²) + n(dR/dρ) + (ρ²kC²– n²) R=0
c) d²R/ dρ² + dR/dρ + (ρ²kC²– n²) R=0
d) None of the mentioned
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3. The lowest mode of TE mode propagation in a circular waveguide is:
a) TE10 mode
b) TE00 mode
c) TE01 mode
d) TE11 mode
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4. What is the cutoff frequency for TE₁₁ mode in a circular waveguide of radius 2 cm with P’₁₁= 1.841?
a) 5.5 GHz
b) 4.3 GHz
c) 7.7 GHz
d) 8.1 GHz
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5. In a circular waveguide, if the propagation is in TE21 mode with P₂₁=3.054, with a diameter of 60 mm, then the cutoff frequency for the mode is:
a) 5.6 GHz
b) 6.4 GHz
c) 3.5 GHz
d) 4.8 GHz
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6. For a circular waveguide in TM11 mode of propagation with inner radius of 30mm, and the phase constant being equal to 0.3, then the wave impedance is equal to:
a) 0.16 Ω
b) 0.15 Ω
c) 0.5 Ω
d) 0.4 Ω
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7. For TM mode. The wave equation in cylindrical co ordinates is:
a) (∂²/∂ρ²+1/ρ ∂/∂ρ + 1/ρ² (∂²/∂∅² + kc²) =0
b) ∂²E²/∂ρ² + 1/ρ ( ∂E/∂ρ)=0
c) ∂²E²/∂ρ² + 1/ρ² (∂²E²/∂∅² ) = 0
d) None of the mentioned
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8. In TM mode, what is the first propagating mode?
a) TM01 mode
b) TM11 mode
c) TM12 mode
d) TM10 mode
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9. For TM01 mode of propagation in a circular waveguide with P₀₁=2.405, with the inner diameter of the circular waveguide being equal to 25 mm. What is the cut off frequency for this mode of propagation?
a) 2.8 GHz
b) 6 GHz
c) 3.06 GHz
d) 4 GHz.
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10. If β is 0.3 for a circular wave guide operating in TM12 mode with P₂₁=5.315, with the radius of the circular waveguide being equal to 25 mm, then the intrinsic impedance of the wave is:
a) 0.55 Ω
b) 0.4 Ω
c) 0.3 Ω
d) 1.2 Ω
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11. The cutoff frequencies of the first two propagating modes of a Teflon on a filled circular waveguide with a=0.5 with ∈r=2.08 is:
a) 12.19 GHz, 15.92 GHz
b) 10 GHz, 12 GHz
c) 12 GHz, 15 GHz
d) 15 GHz, 12 GHz
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Sanfoundry Global Education & Learning Series – Microwave Engineering.
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