Recent activity by jothee_new

The useful heat gain in Watt (rounded off to one decimal place) of a solar flat plate collector using Hottel-Whillier-Bliss equation is $\_\_\_\_$.Assume:Collector heat r...

A country’s annual crude oil production in the year $2024$ was $150$ million tons and that in $2022$ was $141$ million tons. The proven crude oil resources in $2024$ of t...

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 ...

A nonlinear load connected to a sinusoidal voltage source (of peak value $V_{m}$ and $50$ $\mathrm{Hz}$ frequency) draws a quasi-square wave shaped current (of maximum va...

A $75$ $\mathrm{kWh}$ electric vehicle battery pack made of lithium-ion batteries has $4,800$ individual cells in a series-parallel combination, with $120$ cells in serie...

Which of the following options is/are true regarding the behaviour of a typical solar photovoltaic cell?Ideal current sourceCurrent limited voltage sourceVoltage limited ...

Which of the following statements is/are FALSE concerning a wind turbine generation system?The rotor power coefficient, $C_{p}$, of a multi-blade turbine is a monotonical...

A fuel with composition by mass is given as $78 \%$ carbon $(\mathrm{C}), 16 \%$ hydrogen $\left(\mathrm{H}_{2}\right)$, $3.2 \%$ sulphur $(\mathrm{S}), 1.6 \%$ oxygen $\...

A radioactive isotope sample has a decay constant $\lambda= 2.31 \times 10^{-4} \text{year}^{-1}$. Initially the sample contains $8000 \times 10^{15}$ atoms. The sample d...

Which one of the following is the major environmental problem associated with the production of coal-bed methane?Contamination of waterEmission of Carbon dioxideGeneratio...

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?DeclinationLatitude...

A hydro turbine works under a head of $20$ $\mathrm{m}$ and has a maximum volume flow rate of $4 \mathrm{~m}^{3} \mathrm{~s}^{-1}$ and a speed of $750$ $\mathrm{rpm}$. De...

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 pow...

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 in...

The open circuit voltage, short circuit current, and the fill factor of a solar photovoltaic module are $45 \mathrm{~V}$, $9 \mathrm{~A}$, and $0.8$, respectively. The ma...

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...

Which of the following is/are step(s) followed in energy audit?WalkthroughCollection of past energy consumption dataEvaluation of energy conservation measuresPreparation ...

Which of the following is/are greenhouse gas(es), as identified by the Intergovernmental Panel on Climate Change $\text{(IPCC)}$?Nitrogen dioxide ( $\mathrm{NO}_{2}$)Nitr...

A part of the blowdown energy losses in a boiler can be recovered by which one of the following ways?Completely avoiding the blowdownRecycling the blowdown to the steam d...

For a fixed thermal output, which one of the following is the major advantage offered by a concentrated collector over a flat plate collector?Utilization of diffuse solar...

Which one of the following biomass treatment processes occurs in an oxygen limited condition approximately between $450^{\circ} \mathrm{~C}$ and $600^{\circ}\mathrm{~C}$...

The luminous efficacy of an electric light bulb is measured in which one of the following units?lumen $\mathrm{W}^{-1}$lumen $\mathrm{W}^{-1} \mathrm{~h}^{-1}$lumen $\mat...

A two-layered fluid system in an estuarine environment has a total water depth of $10$ $\mathrm{m}$. The difference in densities between the two layers is $15$ $\text{kg ...

Using the dispersion relation for deep water small amplitude wave, the wavelength (in $\mathrm{m}$) for a $20$ second gravity wave is $\_\_\_\_\_\_\_$. (Answer in integer...

In a free atmosphere without friction, if the pressure increases by one kilo Pascal eastward across a distance of $200$ $\mathrm{km}$, the magnitude of geostrophic flow (...

A steady westerly wind is blowing over the ocean surface at a latitude of $30^{\circ} \mathrm{N}$ and exerting a wind stress of $0.8 \mathrm{~N} \mathrm{~m}^{-2}$.The mag...

For an incompressible fluid, the velocity components ( $u, v$, and $w$) are given as:$\begin{array}{rcl}u(x,y,z) & = & 2x + y + 2z \\v(x,y,z) & = & ax + by + cz \\w(x,y,z...

The required magnitude of heat transfer to reduce the temperature of $10$ $\mathrm{kg}$ of dry air by $5^{\circ} \mathrm{~C}$ is __________ kilo Joules. (rounded off to o...

The temperature of a dry air parcel is $20^{\circ} \mathrm{C}$ at a height of $150$ $\mathrm{m}$ with atmospheric pressure of $1000$ $\mathrm{hPa}$. If the air parcel ris...

Which of the following statements is/are correct for the Equatorial Indian Ocean during a positive Indian Ocean Dipole event?Strong surface westerly windsWeak surface wes...