Engineering Sciences
GATE XE discipline:engineering-sciences PYQs
Build your understanding with focused practice from past exam papers.
Questions 181–190 of 1772. Imported answers require independent review unless marked reviewed.
Question 181
Open questionXE-IMSQ1 markNeeds review
Which of the following is/are step(s) followed in energy audit?
Your answerSelect all correct options. You can choose more than one.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 182
Open questionXE-INAT1 markNeeds review
An energy conservation project requires an initial investment of ₹ 50,000 with an expected annual operation and maintenance cost of ₹ 5,000. This project is expected to reduce the monthly energy cost by ₹ 1,250. The simple payback period (in years) is__________________. (Answer in integer)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 183
Open questionXE-INAT1 markNeeds review
The open circuit voltage, short circuit current, and the fill factor of a solar photovoltaic module are 45 V, 9 A, and 0.8, respectively. The maximum output power (in Watt) of the solar photovoltaic module is____________________. (Answer in integer)
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 184
Open questionXE-INAT1 markNeeds review
Energy is extracted from a fully charged supercapacitor bank and the voltage of this system drops to 25 % of its initial value. The energy extracted with respect to initial energy (in %, rounded off to two decimal places) is____________________.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 185
Open questionXE-IMCQ2 marksNeeds review
A grid-connected induction generator is used to generate electricity from a wind turbine. Which one of the following statements is true while the generator is feeding power to the grid?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 186
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A hydro turbine works under a head of 20 m and has a maximum volume flow rate of 4 m³ s⁻¹ and a speed of 750 rpm. Determine the speed (in rpm) in order to operate the same turbine at approximately the same efficiency under a head of 5 m.
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 187
Open questionXE-IMCQ2 marksNeeds review
Which one of the following defines the angle made by the line joining the centers of the sun and the earth with its projection on the equatorial plane?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 188
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Which one of the following is the major environmental problem associated with the production of coal-bed methane?
Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 189
Open questionXE-IMCQ2 marksNeeds review
A radioactive isotope sample has a decay constant
. Initially the sample contains
atoms. The sample decays to 25% of its initial value. The number of years it takes to decay to this stage is closest to ________________Your answerChoose one option.
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You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answerQuestion 190
Open questionXE-IMCQ2 marksNeeds review
A fuel with composition by mass is given as 78 % carbon (C), 16 % hydrogen (H₂), 3.2 % sulphur (S), 1.6 % oxygen (O₂), and ash. The fuel is fired in a boiler with excess air for the complete combustion and no carbon monoxide (CO) is detected in the flue gases. The dry flue gas contains 0.2 % sulphur dioxide (SO₂) by volume. Which one of the following options is closest to the amount of excess air provided (in % by mass)?
Assume molar masses (g mol⁻¹) of C, H₂, S, and O₂ are 12, 2, 32, and 32, respectively, and the volumetric ratio of nitrogen (N₂) and oxygen (O₂) in the air as 3.76:1.
Your answerChoose one option.
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