Official PYQ · 2014Set 4 · Q8Transmission LinesMCQ1 mark

GATE EC 2014 Set 4 Q8 — Transmission Lines

At $T=300 \:K$ , the band gap and the intrinsic carrier concentration of GaAs are $1.42$ eV and $10^6 \: cm^{-3}$ , respectively. In order to generate electron hole pairs in GaAs, which one of the wavelength $(\lambda_C)$ ranges of incident radiation, is most suitable? (Given that: Plank’s constant is $6.62 \times 10^{-34} \: J-s$ , velocity of light is $3 \times 10^{10} \: cm/s$ and charge of electron is $1.6 \times 10^{-19} \:C$ )

View answer

Answer: A

Worked explanation not available yet.

Free practice · Your answers on this page are not saved.

Published 10 Oct 2026

Report a correction

GATE EC · 2026Transmission Lines
Consider the Friis' transmission equation $P_{R}=\left(P_{T} G_{T} G_{R} \lambda^{2}\right) /(4 \pi D)^{2}$ , where $P_{R}$ and $P_{T}$ are the received and the transmitted powers, respectively. $G_{T}$ and $G_{R}$ are the gain of transmitting and receiving antennas, respectively, $D$ is the distance between the transmitting and receiving …
MCQ · 1 mark
GATE EC · 2026Transmission Lines
The cutoff frequency ( $\text{in GHz}$ ) for the dominant $\mathrm{TE}_{10}$ mode of an air-filled rectangular waveguide of inner dimension $0.28$ inch $\times 0.14$ inch is $\_\_\_\_$ . (rounded off to two decimal places).
NAT · 1 mark
GATE EC · 2026Transmission Lines
A complex load (in $\Omega$ ) is represented as $\Gamma_{L}=0.5 \angle 30^{\circ}$ on the Smith chart. A co-axial cable with a characteristic impedance of $50 ~\Omega$ is connected to the load. The new input impedance of the load now moves to a diametrically opposite point on the same $\Gamma$ circle on the Smith chart. Which option is the nearest …
MCQ · 2 marks
GATE EC · 2025Transmission Lines
A $50 \Omega$ lossless transmission line is terminated with a load $\mathrm{Z}_{\mathrm{L}}$ of $(50-\mathrm{j} 75) \Omega$ . If the average incident power on the line is $10 \: \mathrm{mW}$ , then the average power delivered to the load (in $\mathrm{mW}$ , rounded off to one decimal place) is $\_\_\_\_\_\_\_$ .
NAT · 2 marks
GATE EC · 2024Transmission Lines
Consider a lossless transmission line terminated with a short circuit as shown in the figure below. As one moves towards the generator from the load, the normalized impedances $z_{\text{inA }}, z_{i n B}, z_{i n C}$ , and $z_{i n D}$ (indicated in the figure) are $\_\_\_\_\_\_.$
MCQ · 1 mark
GATE EC · 2024Transmission Lines
A lossless transmission line with characteristic impedance $\mathrm{Z}_{0}=50 \Omega$ is terminated with an unknown load. The magnitude of the reflection co-efficient is $|\Gamma|=0.6$ . As one moves towards the generator from the load, the maximum value of the input impedance magnitude looking towards the load (in $\Omega$ ) is $\_\_\_\_\_\_.$
NAT · 2 marks

Browse this topic

More Transmission Lines questions

GATE EC 2014 Set 4 Q8 — Transmission Lines

Related questions