GATE Communication and Optical Instrumentation: Optical sources and detectors – Previous Year Questions
7 GATE previous year questions on Optical sources and detectors (Communication and Optical Instrumentation, Instrumentation Engineering) with answers and explanations, from every paper.
- GATE 2021 IN Q44 – A laser pulse travels normally from ground level to the bottom of a concrete water tank and returns to a detector at ground level in 100 ns. Water…
- GATE 2022 IN Q27 – A photodiode is made from a semiconductor of bandgap 1.42 eV. Given Planck’s constant 6.62610-34 J·s, vacuum light speed 3108 m/s, and 1 eV =1.610-19…
- GATE 2022 IN Q51 – Monochromatic light of wavelength 532 nm is used to measure the absorption coefficient of a material in a UV-Visible Spectrophotometer. The measured…
- GATE 2023 IN Q18 – An LED emits light when it is biased. A photodiode provides maximum light sensitivity when it is biased.
- GATE 2023 IN Q38 – A p-i-n photodiode receives a light pulse containing 81012 photons at wavelength 0=1.55 μm. An average of 41012 electrons is collected at its…
- GATE 2026 IN Q28 – The slope efficiency of a laser diode is 0.5\ W/A, and the output optical power at a current of 100 mA is 30 mW. Assuming piecewise-linear…
- GATE 2026 IN Q65 – A photodiode has a responsivity of 0.8\ A/W. If the input optical power to the photodiode is 2 mW, the power delivered to a 50\ load is μW. (Rounded…