Q. In a surface condenser near to the air pump suction the vacuum is 500 mm of mercury with 730 mm of mercury height in a barometer. The pressure near the air pump suction would be

• (A) 0.69 kg/sq-cm
• (B) 1.213 kg/sq-cm
• (C) 0.313 kg/sq-cm
• (D) 0.687 kg/sq-cm