Heat Engine

Question

Temperatures of the source and sink between which an ideal heat engine is working are x and y respectively (Kelvin)

Its efficiency is n.

What is its new efficiency if the source temperature is tripled and sink temperature is doubled?

a)(2n-1)/3

b)(2n+1)/3

c)(3n+1) /2

d)(n+2)/3

Plz explain..

bhanu p · Accepted Answer

We know that n = 1 - y/x => n-1 = -y/x ---(1) similarly, let n' be the new efficiency, and n' = 1 - y'/x' whare y' = 2y and x' = 3x => n' = 1- 2y/3x => n'-1 = -2y/3x ---(2) (1) / (2) => n-1/n'-1 = 3/2 => n' = (2n + 1)/3 ,therefore option is (b)

Thermal Physics> Heat Engine...

Temperatures of the source and sink between which an ideal heat engine is working are x and y respectively (Kelvin)

Its efficiency is n.

What is its new efficiency if the source temperature is tripled and sink temperature is doubled?

a)(2n-1)/3

b)(2n+1)/3

c)(3n+1) /2

d)(n+2)/3

Plz explain..

Chilukuri Sai Kartik , 14 Years ago

bhanu p

LIVE ONLINE CLASSES

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Thermal Physics> Heat Engine...

Temperatures of the source and sink between which an ideal heat engine is working are x and y respectively (Kelvin) Its efficiency is n. What is its new efficiency if the source temperature is tripled and sink temperature is doubled? a)(2n-1)/3 b)(2n+1)/3 c)(3n+1) /2 d)(n+2)/3 Plz explain..

Chilukuri Sai Kartik , 14 Years ago

bhanu p

LIVE ONLINE CLASSES

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Temperatures of the source and sink between which an ideal heat engine is working are x and y respectively (Kelvin)

Its efficiency is n.

What is its new efficiency if the source temperature is tripled and sink temperature is doubled?

a)(2n-1)/3

b)(2n+1)/3

c)(3n+1) /2

d)(n+2)/3

Plz explain..