ANS:D - Develops high pressure

Out of the options listed, "Increase in thrust" is not typically considered an undesirable effect created by cavitation in a pump. Here’s an explanation of the effects of cavitation and why "Increase in thrust" does not fit:

1. Decrease in efficiency: Cavitation can lead to a decrease in pump efficiency due to reduced flow rates, increased power consumption, and potential damage to pump components.
2. Noise: Cavitation causes noise due to the collapse of vapor bubbles in the pump, which can be damaging and disruptive.
3. Damage to pump components: The collapse of vapor bubbles during cavitation can erode pump components, leading to increased maintenance and repair costs.
4. Vibration: Cavitation can induce vibration in the pump system, which can further contribute to mechanical wear and tear.

Regarding "Increase in thrust": Cavitation does not typically cause an increase in thrust in a pump. Instead, it is more associated with detrimental effects such as those listed above. Therefore, "Increase in thrust" is not an effect commonly attributed to cavitation and thus does not fit among the undesirable effects caused by cavitation. Therefore, the correct answer is: Increase in thrust