TS EAMCET · Physics · Thermodynamics
Efficiency of a heat engine whose sink is at temperature of \(300 \mathrm{~K}\) is \(40 \%\). To increase the efficiency to \(60 \%\), keeping the sink temperature constant, the source temperature must be increased by
- A \(750 \mathrm{~K}\)
- B \(500 \mathrm{~K}\)
- C \(250 \mathrm{~K}\)
- D \(1000 \mathrm{~K}\)
Answer & Solution
Correct Answer
(C) \(250 \mathrm{~K}\)
Step-by-step Solution
Detailed explanation
\[ \begin{array}{ll} \frac{T_2}{T_1}=1-\eta=1-\frac{40}{100}=\frac{3}{5} \\ \Rightarrow & T_1=\frac{5}{3} T_2 \\ \Rightarrow & T_1=\frac{5}{3} \times 300=500 \mathrm{~K} \end{array} \] New efficiency \(\eta^{\prime}=60 \%\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A capacitor of capacitance is charged to a potential difference of with a battery. The battery is then removed and in its place another capacitor of capacitance is introduced and the circuit is closed. The potential difference attained by each of the capacitors in isTS EAMCET 2019 Easy
- A tension of \(20 \mathrm{~N}\) is applied to a copper wire of cross sectional area \(0.01 \mathrm{~cm}^2\), Young's modulus of copper is \(1.1 \times 10^{11} \mathrm{~N} / \mathrm{m}^2\) and Poisson's ratio is 0.32 . The decrease in cross sectional area of the wire isTS EAMCET 2013 Medium
- A soap bubble of radius \(r\) is blown up to form a bubble of radius \(2 r\) under isothermal conditions. If \(T\) is the surface tension of soap solution, the energy spent in the blowingTS EAMCET 2009 Easy
- In a \(p-n-p\) transistor, the current carriers areTS EAMCET 2020 Easy
- Two long straight parallel wires carry currents of 8 A and 10 A in opposite directions. If the distance of separation between the wires is 9 cm, then the net magnetic field at a point between the two wires, which is at a perpendicular distance of 4 cm from the wire carrying 8 A current isTS EAMCET 2025 Medium
- An ideal gas in a cylinder is compressed adiabatically to one-third of its original volume. A work of \(45 \mathrm{~J}\) is done on the gas by the process. The change in internal energy of the gas and the heat flowed into the gas, respectively areTS EAMCET 2018 Easy
More PYQs from TS EAMCET
- Consider the following two circuits bulbs are connected in series to a power supply line bulbs identical to are connected in a parallel circuit to an identical power supply line Identify which of the following is not trueTS EAMCET 2018 Easy
- The modulation index used in amplitude modulation of a message signal of peak voltage \(10 \mathrm{~V}\) is 0.5 . By how much the peak voltage of the carrier signal be changed, so as to obtain the modulation index of 0.8 , keeping the peak voltage of the message signal same as before?TS EAMCET 2020 Easy
- In a meter bridge experiment the ratio of the left gap resistance to the right gap resistance is \(2: 3\). The balance length from left end isTS EAMCET 2023 Hard
- A block of mass \(10 \mathrm{~kg}\), initially at rest, makes a downward motion on \(45^{\circ}\) inclined plane. Then the distance travelled by the block after \(2 \mathrm{~s}\) is (Assume the coefficient of kinetic friction to be 0.3 and \(g=10 \mathrm{~ms}^{-2}\) )TS EAMCET 2019 Hard
- Find the potential difference between and , as shown in the below circuit.
TS EAMCET 2019 Medium - The voltage gain of a transistor in common emitter configuration is 160 . The resistances in base and collector sides of the circuit are 1 kW and 4 kW respectively. If the change in base current is \(100 \mu \mathrm{~A}\), then the change in output current isTS EAMCET 2024 Hard