Chemical Engineering
GATE CH year:2018 PYQs
Build your understanding with focused practice from past exam papers.
Questions 31–40 of 65. Imported answers require independent review unless marked reviewed.
Question 21
Open questionCHMCQ1 markNeeds review
For a chemical reaction, the ratio of rate constant at 500 K to that at 400 K is 2.5. Given R = 8.314 J mol⁻¹ K⁻¹, the value of activation energy (in kJ/mol) is
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Pitot tube is used to measure
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A venturi meter is installed to measure the flow rate of water in a 178 mm diameter (ID) pipe. The throat diameter is 102 mm. The differential pressure measured using a manometer is 154.3 kN/m². The data given are:
discharge coefficient = 0.98; water density = 1000 kg/m³.
The volumetric flow rate of water (in m³/s) is __________.
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The ammonia (NH₃) oxidation process occurs over a catalyst as
4 NH₃ + 5 O₂ → 6 H₂O + 4 NO
Air is supplied such that oxygen (O₂) is 20% in excess of that required for complete conversion of NH₃. The mole fraction of O₂ in inlet gas mixture (NH₃ + air) is ______ (rounded off to third decimal place).
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The initial water level in a tank is 4 m. When the valve located at the bottom is opened, the rate of change of water level (L) with respect to time (t) is, dL/dt = −k√t, where k = 0.6 m s⁻³ᐟ². The level of water (in m) in the tank at time 0.5 s after opening the valve is __________ (rounded off to second decimal place).
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Open questionCHMCQ2 marksNeeds review
Match the equipment in Column A with the corresponding process in Column B
Column A | Column B |
|---|---|
(P) Centrifugal sifter | (I) Mixing |
(Q) Bowl mill | (II) Sedimentation |
(R) Gravity thickener | (III) Screening |
(S) Two-arm kneader | (IV) Grinding |
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In the year 2005, the cost of a shell and tube heat exchanger with 68 m² heat transfer area was Rs. 12.6 Lakh. Chemical Engineering Index for cost in 2005 was 509.4 and now the index is 575.4. Based on index of 0.6 for capacity scaling, the present cost (in Lakhs of rupees) of a similar heat exchanger having 100 m² heat transfer area is estimated to be
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A furnace installed at a cost of Rs. 24 Lakh is expected to serve its useful life of 5 years. Salvage value of the furnace is Rs. 8 Lakh. The interest rate compounded annually is 8%. The estimated capitalized cost (in Lakhs of rupees) is
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G denotes the Gibbs free energy of a binary mixture, nₜ denotes the total number of moles present in the system, μᵢ is the chemical potential of the iᵗʰ component (μᵢ ≠ 0 and μ₁ > μ₂) and xᵢ is the mole fraction of the iᵗʰ component. The correct variation of G/nₜ (in J/mol) at constant temperature and pressure is given by
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Open questionCHMCQ2 marksNeeds review
A person is drowning in sea at location R and the lifeguard is standing at location P. The beach boundary is straight and horizontal, as shown in the figure.
The lifeguard runs at a speed of V_L and swims at a speed of V_S. In order to reach to the drowning person in optimum time, the lifeguard should choose point Q such that
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