SATHEE: Work Energy And Power Question 179

Work Energy And Power Question 179

Question: A 12 HP motor has to be operated 8 hours/day. How much will it cost at the rate of 50 paisa/kWh in 10 days

Options:

A) Rs. 350/-

B) Rs. 358/-

C) Rs. 375/-

D) Rs. 397/-

Show Answer

Answer:

Correct Answer: B

Solution:

If a motor of 12 HP works for 10 days at the rate of 8 hr/day then energy consumption = power × time = $12 \times 746 \frac{J}{\sec} \times (80 \times 60 \times 60) \sec$

$= 12 \times 746 \times 80 \times 60 \times 60 J$ = 2.5 × 109 J

Rate of energy = $50 \frac{p a i s a}{k W h}$ i.e. $3.6 \times 10^{6} J$

energy cost 0.5 Rs So 2.5 × 109 J

energy cost = $\frac{2.5 \times 10^{9}}{2 \times 3.6 \times 10^{6}} = 358 R s$

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Work Energy And Power Question 179

Question: A 12 HP motor has to be operated 8 hours/day. How much will it cost at the rate of 50 paisa/kWh in 10 days

Options:

Answer:

Solution:

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