A heat engine uses one mole of ideal gas as its working substance which performs the following cyclic process, as shown in the figure below. Given $P_C=2 P_A, V_C=2 V_A$, select the correct statement(s).

• Correct answer
  A

  Heat released by the heat engine during one cycle is given by $\frac{11}{2} P_A V_A$.
• Correct answer
  B

  The efficiency of the heat engine is $15.4 \%$.
• Correct answer
  C

  The change in entropy of the gas during one cycle is zero.
• D

  The minimum temperature occurs at D .

Hence, the correct answer is options: 'A', 'B', 'C'.