Olete.in – MCQs, Mock Tests & Government Job Prep | Electrical engineering Microwave Engineering MCQs Set-3

The dominant waveguide mode of a co axial line is:

1. TE11 mode
2. TE01 mode
3. TM01 mode
4. TEM mode

✅ Correct Answer: 1

In a co axial line with inner and outer diameters of 0.0645 and 0.0215 inches and a Teflon di electric with ∈r=2.2. The highest usable frequency before the TE11 waveguide mode starts to propagate is:

1. 16.8 GHz
2. 117.7 GHz
3. 15.3 GHz
4. 8.4 GHz

✅ Correct Answer: 1

If a wave guide has he inner and outer conductor diameters of 0.0645 and 0.0215 inches respectively for a co axial lines then the cut off wave number is:

1. 298
2. 300
3. 285
4. 123

✅ Correct Answer: 1

The commercially used co axial cable and connectors used has a characteristic impedance is:

1. 50Ω
2. 100Ω
3. 33.34Ω
4. 66.6Ω

✅ Correct Answer: 1

In television systems the characteristic impedance of the cables used is:

1. 75Ω
2. 150Ω
3. 100Ω
4. 50Ω

✅ Correct Answer: 1

SWR standing wave ratio has to be ________for co axial connector.

1. Low
2. High
3. Infinite
4. Cannot be calculated

✅ Correct Answer: 1

What are the connectors used in pairs called?

1. Jack and plug
2. Male and female connectors
3. Both the mentioned
4. None of the mentioned

✅ Correct Answer: 3

The frequency range for N type co axial connector is:

1. 8-12 GHz
2. 11-18 GHz
3. 14-20 GHz
4. 2-8 GHz

✅ Correct Answer: 2

The frequency range of SMA co-axial connector used most commonly is:

1. 18-25 GHz
2. 25-50 GHz
3. 11-18 GHz
4. 8-12 GHz

✅ Correct Answer: 1

Surface waves are typical by a field that decays ______away from the dielectric surface, with most of the field contained in or near the dielectric.

1. Linearly
2. Exponentially
3. Cubical
4. Field remains a constant

✅ Correct Answer: 2

Because of the presence of the dielectric, the phase velocity of a surface wave is:

1. Greater than that in vacuum
2. Lesser than that in vacuum
3. Independent of the presence of dielectric
4. Insufficient data

✅ Correct Answer: 2

The cutoff frequency in TM1 mode for the propagation of EM waves on dielectric slab of relative permittivity 2.6 and thickness 20 mm is:

1. 6.5 GHz
2. 5.92 GHz
3. 4 GHz
4. 2 GHz

✅ Correct Answer: 2

Cutoff frequency fC for TEM mode of propagation is:

1. Fc= (2n-1)c/4d√εr -1
2. Fc= (2n-c)/2d(√εr-1)
3. Fc= (2n-1)/4d(√εr)
4. Fc= (2n-1)/8d√εr – 1

✅ Correct Answer: 1

The first propagating mode on a grounded dielectric is:

1. TMO mode
2. TM1 mode
3. TM2 mode
4. TM3 mode

✅ Correct Answer: 2