Question

In a cyclic process, the net heat supplied is 70 kJ/sec. The work obtained from the cycle is equal to
(a) less than 70 kJ/sec (6) more than 70 kJ/sec
(c) zero
(d) 70 kJ/se
(e) would depend on change in internal energy.​

Answer 1

Answer:

Would depend on change in internal energy.

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Answer 2

Answer:

Option (d) 70kJ/sec is correct.

Explanation:

• Internal energy is a state function.
• The change in the value of a process depends solely upon its value at the initial and final states. It is independent of the path through which change is brought forth.
• The change in internal energy of a cyclic process is zero.
• Work done is a path function: it is dependent on the path followed during a process. According to the mathematical formulation of the first law of thermodynamics,

        Q = Δ U ± W

• The change in internal energy is zero, hence, the work done will be equal to heat supplied.

Conclusion:

The work obtained from the cycle is equal to 70kJ/sec.