Questions

# A continuous flow water heater (geyser) has an electrical power rating of  2kW and efficiency of conversion of electrical power into heat is 80% If water is flowing through device at the constant rate of 100cc/s and the inlet temperature is 100C,the outlet temperature will be (assume density remains constant)

## Unlock the full solution & master the concept.

Get a detailed solution and exclusive access to our masterclass to ensure you never miss a concept
By Expert Faculty of Sri Chaitanya
a
12.2∘C
b
13.8∘C
c
20∘C
d
30∘C
NEW

Check Your Performance Today with our Free Mock Tests used by Toppers!

detailed solution

Correct option is B

Power P=dQdt⇒P=msdθdt(∵dQ=msdθ)⇒80100×P=dVdt×ρ×s×dθ⇒80100×2000=100×10−6×103×4200×(θ−10)⇒θ−10=3.8∴θ=13.8∘C

Similar Questions

The mass, specific heat capacity and the temperature of a solid are $\frac{1}{2}$   and $80°\mathrm{C}$ respectively. The mass of the liquid and the calorimeter are  and . Initially, both are at room temperature $20°\mathrm{C}$. Both calorimeter and the solid are made of same material. In the steady state, temperature of mixture is $40°\mathrm{C}$, then find the specific heat capacity of the unknown liquid.

Get your all doubts cleared from
Sri Chaitanya experts

+91