Question

20. A fluid contained in a horizontal cylinder fitted with a frictionless leak-proof piston is continuously
agitated by a stirrer passing through the cylinder cover. During stirring operation for 10 minutes
the piston slowly moves outwards through 20 cm distance against a pressure of 1 bar. The stirre
turns 600 revolutions and the net work done on the fluid during the process is estimated to be
2kJ. If the cylinder diameter is 40 cm, estimate the torque in the driving shaft and the shaft
output of the motor.
(Ans. 0.1197 Nm, 0.00752 kW)
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Answer 1

Answer:

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Explanation:

20. A fluid contained in a horizontal cylinder fitted with a frictionless leak-proof piston is continuously

agitated by a stirrer passing through the cylinder cover. During stirring operation for 10 minutes

the piston slowly moves outwards through 20 cm distance against a pressure of 1 bar. The stirre

turns 600 revolutions and the net work done on the fluid during the process is estimated to be

2kJ. If the cylinder diameter is 40 cm, estimate the torque in the driving shaft and the shaft

output of the motor.

(Ans. 0.1197 Nm, 0.00752 kW)