Q. A spherical gas tank is made of 1 cm steel plate hemispheres but welded together. The tank is 1503 cm in diameter. The allowable internal pressure to which tank may be subjected is the permissible stress be limited to 840 kg/sq cm would be in the range

• (A) 2.0 to 2.5 kg/sq-cm
• (B) 3.5 to 5.0 kg/sq-cm
• (C) 2.5 to 3.5 kg/sq-cm
• (D) 1.5 to 2.0 kg/sq-cm