Engineering Sciences
GATE XE Energy Storage, Economics, Environment, and Efficiency PYQs
Build your understanding with focused practice from past exam papers.
How to practice Energy Storage, Economics, Environment, and Efficiency
Attempt a question, record the concept and assumptions, then check the available answer. Rework mistakes after revising the relevant concepts. Topic tags can overlap; review the question context.
Questions 1–8 of 8. Imported answers require independent review unless marked reviewed.
Question 176
Open questionXE-IMCQ1 markNeeds review
The luminous efficacy of an electric light bulb is measured in which one of the following units?
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 179
Open questionXE-IMCQ1 markNeeds review
A part of the blowdown energy losses in a boiler can be recovered by which one of the following ways?
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 180
Open questionXE-IMSQ1 markNeeds review
Which of the following is/are greenhouse gas(es), as identified by the Intergovernmental Panel on Climate Change (IPCC)?
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 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 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 194
Open questionXE-INAT2 marksNeeds review
A nonlinear load connected to a sinusoidal voltage source (of peak value
and 50 Hz frequency) draws a quasi-square wave shaped current (of maximum value
) as shown in the figure below. The power factor of the nonlinear load (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 195
Open questionXE-INAT2 marksNeeds review
A resident has ₹ 50,000 to purchase a 5-star rated air conditioner with a life of 10 years. The annual energy cost savings (in ₹) needed to recover this investment in 6 years assuming a discount rate of 10 % per annum is ____________________. (Answer in integer)
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