Under what condition, an ideal Carnot engine has 100% efficiency? - Vidyadip

Question

Under what condition, an ideal Carnot engine has 100% efficiency?

✓

Answer

Efficiency of a Carnot engine is given by $\eta=\Big(1-\frac{\text{T}_2}{\text{T}_1}\Big)$ Where, $T_2$ = temperature of sink and $T_1$ = temperature of sink source. So, for $\eta=1$ or 100%, $T_2$ = 0K or heat is rejected in to a sink at 0K temperature.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Thermodynamics→Thermodynamics — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

The fundamental frequency of a closed pipe is 293Hz when the air in it is at a temperature of 20°C. What will be its fundamental frequency when the temperature changes to 22°C?

Which of the following functions of time represent (a) simple harmonic, (b) periodic but not simple harmonic, and (c) non-periodic motion? Give period for each case of periodic motion ($\omega$ is any positive constant): $3\cos\Big(\frac{\pi}{4}-2\omega\text{t}\Big)$

Define Poisson's ratio. Write an expression for it. What is the significance of negative sign in this expression?

Consider a gold nucleus to be a sphere of radius 6.9 fermi in which protons and neutrons are distributed. Find the force of repulsion between two protons situated at largest separation. Why do these protons not fly apart under this repulsion?

Prove that the horizontal range is same when angle of projection is:

Greater than $45^\circ$ by certain value.
Less than $45^\circ$ by the same value.

Determine the surface area of the filament of a 100W incandescent lamp reflecting out its labeled power at 3000K. Given $\sigma=5.7\times10^{-8}\text{Wm}$ and emissivity $\varepsilon'$ of the material of the filament = 0.3.

Find the average magnitude of linear momentum of a helium molecule in a sample of helium gas at $0^{\circ} \mathrm{C}$. Mass of a helium molecule $=6.64 \times 10^{-27} \mathrm{~kg}$ nd Boltzmann constant $=1.38 \times 10^{-23} \mathrm{JK}^{-1}$.

Heat at the rate of 200W is produced in an X-ray tube operating at 20kV. Find the current in the circuit. Assume that only a small fraction of the kinetic energy of electrons is converted into X-rays.

Under what condition will the distance and displacement of a moving object will have the same magnitude?

A uniform vertical tube of circular cross-section contains a liquid. The contact angle is $90^º$. Consider a diameter of the tube lying in the surface of the liquid. The surface to the right of this diameter pulls the surface on the left of it. What keeps the surface on the left in equilibrium?