Question

An engine pumps up 200 kg of water through a height of 20 m in 10 seconds. If the efficiency of the engine is 80%. Calculate the power of the engine.

विकल्प

• 3800 W

• 5000 W

• 4900 W

• 4800 W

Answer 1

4900 W

Explanation:

Output power = `"mgh"/"t"`

= `(200 xx 9.8 xx 20)/10`

= 3920 watt

∴ η = `"P"_"o"/"P"_"i"`

P_i = `"P"_"o"/η`

= `(3920 xx 100)/80`

= 4900 watt