Question

Q. 10 An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C. its efficiency is
Doubled Temperature of the source is:
(a) 124°C
(b) 37°C
(C) 62°C
(d) 99°C

what 's the right answer??​

Answer 1

Answer:

D is the right answer.

Explanation:

Effeciency of engine is given by ,

η = 1− T2

T1

∴ T2 = 1 - η = 1 - 1 = 5

6 6

»» T2 - 62 = 1 - η = 2 = 2

T1 6 3

»»T2 - 62 = 2 T 1 = 2 × 6 T2

3 3 5

»» or 1 T2 = 62 .

5

»»T2 = 310K 310 - 273° C = 37° C

»»T1 = 6 T 2 = 6 × 310 = 372 K

5 5

»»≥° C = 372 - 273 = 99° C

»»hence; the ans is{ 99° }C.

hopefully it might help you✌✌