The pressure drop resulting from a constriction in a tube can be restored by which of the follow-ing?

a. An increase in flow rate
b. A postconstriction increase in radius
c. The addition of another entrainment port
d. A further decrease in the radius of the tube

ANS: B
This question involves the Venturi principle, which states that the pressure drop caused by fluid flowing through a tubular constriction can be restored to preconstriction values by allowing for a gradual dilation in the tube.