Question

If a steam engine delivers 6.0 × 108 J of work per minute and absorbs 5.4 × 109 J of heat per minute from its boiler then efficiency of the engine is

• A. 11%
• B. 12%
• C. 13%
• D. 14%

Answer 1

Answer: (A)

11%

Answer 2

: efficiency of engine = $\frac { \text { work out put } ( W ) } { \text { heat input } ( Q ) }$

$= \frac { 6.0 \times 10 ^ { 8 } } { 5.4 \times 10 ^ { 9 } } = 0.11 = 0.11 \times 100 \% = 11 \%$