Exercise no. 1

Determine the vacuum efficiency of a surface condenser which operates at a vacuum of 635 mm Hg and exhaust steam enters the condenser at 45.81^o . The barometric is 760 mm Hg

• A. 80.4 %

• B. 85.2%

• C. 92.2%

• D. 98.3%

A double suction centrifugal pumps delivers 70 ft³ /sec of water at a head of 12 m and running at 1250 rpm. What is the specific speed of the pump?

• A. 5014 rpm

• B. 5453 rpm

• C. 2345 rpm

• D. 9968 rpm

The pump center line of a centrifugal pump is located 2.5 m above from the high tide level. The sea water varies two meters from high tide to low tide level. If friction loss at the suction is 0.8 m, determine the total suction head.

• A. 5.30 m

• B. 2.30 m

• C. 6.30 m

• D. 8.23 m

A centrifugal pump requires 40 ft head to deliver water from low level to higher level. If pump speed is 1600 rpm, determine the impeller diameter of the centrifugal pump.

• A. 185 mm

• B. 160 mm

• C. 154 mm

• D. 176 mm

A pump is to deliver 150 gpm of water at ahead of 120 m. If pump efficiency is 70%, what is the horsepower rating of motor required to drive the pump?

• A. 40.44 Hp

• B. 25.66 Hp

• C. 38.44 Hp

• D. 21.33 Hp