GATE General Engineering: Thermal and Fluids Engineering – Previous Year Questions
22 GATE previous year questions on Thermal and Fluids Engineering (General Engineering, Production and Industrial Engineering) with answers and explanations, from every paper.
- GATE 2021 PI Q26 – Which dimensionless number is the ratio of inertial to viscous force?
- GATE 2021 PI Q27 – A capillary tube of 3 mm inner diameter is inserted into fluid of density 900 kg/m³, surface tension 0.1 N/m and contact angle 30°. Find capillary…
- GATE 2021 PI Q32 – A refrigerator removes heat at 300 kJ/min to maintain its inside at 2°C. Input power is 2 kW. Find COP to one decimal.
- GATE 2021 PI Q33 – An ideal Otto cycle receives 800 kJ/kg during constant-volume heat addition and rejects 381 kJ/kg during constant-volume cooling. Find thermal…
- GATE 2021 PI Q46 – A circular tank of diameter 4 m holds water to depth 3 m. Assuming almost steady flow and no losses, find time to empty through a 5 cm diameter…
- GATE 2021 PI Q62 – Fluid of dynamic viscosity 1 Pa·s and density 1000 kg/m³ flows at 0.2 litre/s through a 1 cm circular pipe. Assuming fully developed flow, find…
- GATE 2021 PI Q64 – A sphere has radius 1 m, centered at the origin, and thermal conductivity K = 50 W/(m·K). Its temperature field is T=100-70x+51y-80z-10x2-20y2-20z2.…
- GATE 2022 PI Q27 – Water of kinematic viscosity 1 × 10⁻⁶ m²/s flows through an 8 mm horizontal circular pipe. Flow is fully developed and laminar, with maximum axial…
- GATE 2022 PI Q48 – Air initially at 15°C, 1 bar is heated irreversibly to 303°C, 2 bar. Treat it as calorically perfect, R = 287 J/(kg·K), γ = 1.4. Find entropy change…
- GATE 2023 PI Q15 – Two infinite plane parallel black surfaces exchange thermal radiation. A black radiation shield is inserted midway between them. Find the ratio of…
- GATE 2023 PI Q31 – A wooden cube of side 0.1 m and specific gravity 0.75 is held submerged by a massless rigid wire in the shown oil–water pool. Oil SG = 0.7; oil depth…
- GATE 2023 PI Q32 – Steam steadily enters a turbine at h₁ = 3200 kJ/kg and exits wet at 0.1 bar. Heat loss is 100 kJ/kg and work output 1000 kJ/kg; neglect…
- GATE 2023 PI Q60 – Water flows in a 0.02 m diameter pipe at Reynolds number 1000. The pipe is heated externally at uniform heat flux; steady flow and heat transfer are…
- GATE 2023 PI Q61 – In an ideal air-standard Brayton cycle, compressor inlet is 100 kPa and 300 K. Thermal efficiency is 50%; heat addition is 1000 kJ/kg. Air has…
- GATE 2024 PI Q14 – An electrically heated thin copper wire is covered with insulation thickness t. Under steady conditions heat loss per unit length is Q. Which…
- GATE 2024 PI Q48 – A pump draws pond water. A 5.05 cm hose connects at its outlet 1.02 m below surface level. Just after the pump, gauge pressure is 50 kPa and mass flow…
- GATE 2024 PI Q49 – An air-standard Otto cycle starts compression at 200 kPa and 26.85°C. Constant-volume heat addition is 1.02 MJ/kg and efficiency is 50%. Assume ideal…
- GATE 2025 PI Q28 – Heat addition in an ideal Diesel cycle is .
- GATE 2025 PI Q64 – Water flows steadily, fully developed and laminar through a smooth circular pipe of diameter 10 cm and length 10 m. Pressure drop is 0.2 Pa; kinematic…
- GATE 2025 PI Q65 – A 20 cm wall has left face held at 25°C and right face exposed to 50°C air. There is no internal heat generation; k = 100 W/(m·K) and right-side…
- GATE 2026 PI Q29 – Which ONE OR MORE processes of the Carnot cycle shown are isentropic? Figure is not to scale.
- GATE 2026 PI Q43 – A vertical glass tube of diameter 2.5 mm is immersed in a fluid with zero contact angle, surface tension 0.1 N/m, density 1000 kg/m³ and g = 10 m/s².…