An engine has an efficiency of 1/6. When the temperature of sink is reduced

⇦

⇨

An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62⁰C, its efficiency is doubled. Temperature of the source is

Options

(a) 37⁰C
(b) 62⁰C
(c) 99⁰C
(d) 124⁰C

Correct Answer:

99⁰C

Explanation:

Since efficiency of engine is ? = 1 – T₂ / T₁
According to the problem, 1/6 = 1 – T₂ / T₁ ……(1)
When the temperature of the sink is reudced by 62⁰C, its efficiency is doubled
2 (1/6) = 1 – T₂ – 62 / T₁ ……..(2)Solving (1) and (2) T₂ = 372 K
T₁ = 99⁰C = Temperature of source.

Related Questions:

1. Identify the wrong statement with reference to solar cell
2. Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ .
3. An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
4. A nucleus of mass number 220, initially at rest, emits an α-particle. If the Q-value
5. Two metal wires of identical dimensions are connected in series. If σ₁ and σ₂ are

Topics: Thermodynamics (179)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends