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**Exponential decline curve is to be used to estimate the oil reserves of a well. The current oil production rate is 1000 m3 per day and yearly decline rate is 6% per year. If the minimum oil flow rate economically sustainable for the well is 1 m3 per day, the reserves (economically producible) associated with the well are _____ × 106 m3 . (rounded-off to two decimal places. Use 1 year = 365 days) Gate-2018-General-Aptitude**

1 Answer

**The relative decline rate of oil is given by 1/q dq/dt = −aq^b , where q is the oil production rate, a (> 0) is the decline rate and b is a constant. The equation gives harmonic decline curve when b is (A) 1.5 (B) 1 (C) 0.5 (D) 0**

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**An oil well is tested at a flow rate (Q) of 50 BOPD. The bottom hole flowing pressure (Pwf) is 500 psia.The Vogel’s correlation is: Gate-2018-General-Aptitude**

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**Stream A with specific heat capacity CPA = 2000 J/(kg K) is cooled from 90 °C to 45 °Cin a concentric double pipe counter current heat exchanger having a heat transfer area of 8 m2 . The cold stream B of specific heat capacity CPB = 1000 J/(kg K) enters the exchanger at a flow rate 1 kg/s and 40 °C. The overall heat transfer coefficient U 250 W/(m2 K). Assume that the mean driving force is based on the arithmetic mean temperature difference, that is, , , , , 2 2 A in A out B in B out AMTD T T T T T where Ti in, and Ti out , refer to the temperature of the i th stream (i = A, B) at the inlet and exit, respectively. The mass flow rate of stream A (in kg/s), is _______________ (rounded off to two decimal places).**

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**The viscosity, μ (in Pa.s) of a power law fluid as a function of shear rate, γ̇ (in s-1 ) is given by the following relation: Gate-2018-General-Aptitude**

0 Answer

**A company invests Rs.50 thousand in assets. The initial investment is Rs.30 thousand with two subsequent investments of Rs.10 thousand each at the end of 1 st year and 2nd year. The useful life of the assets is 10 years with no salvage value at the end. If the interest rate is 10% and the minimum attractive rate of return (MARR) is 12%, the annual capital recovery and return (CRR) in thousands of Rs. is**

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**A countercurrent absorption tower is designed to remove 95% of component A from an incoming binary gas mixture using pure solvent B. The mole ratio of A in the inlet gas is 0.02. The carrier gas flow rate is 50 kmol/h. The equilibrium relation is given by Y = 2X, where Y and X are the mole ratios of A in the gas and liquid phases, respectively. If the tower is operated at twice the minimum solvent flow rate, the mole ratio of A in the exit liquid stream is _______________ (rounded off to three decimal places).**

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**Saturated steam at 0.7 atm and 90°C condenses on a vertical pipe of 2 cm outside diameter and 40 cm length. The average condensation heat transfer coefficient on the tube is 12000 W/m2K. Gate-2018-General-Aptitude**

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**Consider two competing equipment A and B. For a compound interest rate of 10% per annum, in order for equipment B to be the economically cheaper option, its minimum life (in years) is ________ (rounded off to the next higher integer).**

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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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**Consider a two-level cache hierarchy L1 and L2 caches. An application incurs 1.4 memory accesses per instruction on average. For this application, the miss rate of L1 cache 0.1, the L2 cache experience on average. 7 misses per 1000 instructions. The miss rate of L2 expressed correct to two decimal places is ______________. -gate computer science 2017**

1 Answer

**Which one of the following options is correct about the effects of steam stimulation in increasing the oil production rate? (I) Reduces the oil viscosity (II) Increases the formation damage (III) Reduces the interfacial tension (IV) Increases the oil viscosity (A) Only I and II (B) Only II and III (C) Only III and IV (D) Only I and III Gate-2018-General-Aptitude**

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**An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum. The voltage is 220 V. What are the current and the resistance in each case? -CBSE Physics**

1 Answer

**A population of rabbits was determined to have a birth rate of 200 and mortality rate of 50 per year. If the initial population size is 4000 individuals, after 2 years of non-interfered breeding the final population size will be _______________.**

1 Answer

**A person had deposited Rs 2500 in a bank on Ist January and withdrew Rs 1000 from the bank at the end of 9 months. If the rate of interest is 4% p.a., then the total interest payable to him at the end of the year is:**

2 Answer

**A driller finds an oil reservoir with a gas cap starting at a depth of 1000 m from the surface. Gate-2018-General-Aptitude**

0 Answer

**A 50 mm (diameter) sphere of solid nickel is oxidized in a gas mixture containing 60% argon and 40% oxygen by volume. The rate of oxidation of nickel is controlled by the rate of transport of oxygen through the concentration boundary layer. The rate of oxidation (in moles of nickel per minute (mol/min), rounded off to two decimal places) is_______________. Given: Total pressure = 1atm.; Temperature = 1173 K; Concentration of oxygen at the surface of the solid = 0; Boundary layer mass transfer coefficient = 0.03 m. s^−1 ; Universal gas constant, R = 8.205 × 10^−5 m3 . atm.K ^−1 . mol^−1 . Assume ideal gas behavior.**

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**Which one of the following options presents the correct combinations? (P) Borisov’s (I) Critical rate correlation in vertical wells with coning (Q) Schols’ (II) Horizontal well performance relation (R) Efros’ (III) Vertical well performance relation (S) Wiggins’ (IV) Critical rate correlation in horizontal wells with coning.Gate-2018-General-Aptitude**

0 Answer

**Given the following data: design life n = 15 years, lane distribution factor D = 0.75, annual rate of growth of commercial vehicles r = 6%, vehicle damage factor F = 4 and initial traffic in the year of completion of construction = 3000 Commercial Vehicles Per Day (CVPD). As per IRC:37-2012, the design traffic in terms of cumulative number of standard axles (in million standard axles, up to two decimal places) is ______ (GATE-CIVIL-Engg-2018)**

1 Answer

**Water enters a sump having the shape of an inverted frustum at a rate of 500 m3 /h. The sump is initially filled up to 2.0 m height. The time taken in days to fill the remaining part of the sump (rounded off to one decimal places) is __________.**

0 Answer

### Notes

**Gate-2018-General-Aptitude**

**CE 2402 ESTIMATION AND QUANTITY SURVEYING**

**Gi-Fi**

**aptitude-gate-2018**

**CE 2451 ENGINEERING ECONOMICS AND COST ANALYSIS**

**WiFiber**

**Numerology number 1**

**Gate-2019-General-Aptitude**

**GE6252 Basic Electrical and Electronics Engineering Anna university notes**

**DME 202 Entrepreneurship Development and Research**

## Exponential decline curve is to be used to estimate the oil reserves of a well. The current oil production rate is 1000 m3 per day and yearly decline rate is 6% per year. If the minimum oil flow rate economically sustainable for the well is 1 m3 per day, the reserves (economically producible) associated with the well are _____ × 106 m3 . (rounded-off to two decimal places. Use 1 year = 365 days) Gate-2018-General-Aptitude

## Derive the formula and answer the question .

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