Aux 1 Unit 4 Q2

Correct Answer: B) Debris or foreign objects entering the pump

Explanation: Debris or foreign objects can enter the pump and clog the impeller or pump casing, leading to reduced flow and poor performance. Regular maintenance and filtration can help prevent this issue.

Correct Answer: A) Electrical wiring of the motor is reversed

Explanation: If the motor's electrical wiring is reversed, the pump will rotate in the wrong direction. This incorrect rotation prevents the pump from performing as designed, leading to poor or no water movement.

Correct Answer: B) It causes cavitation and reduces the flow rate

Explanation: A blockage in the suction line restricts the flow of water into the pump, leading to cavitation (the formation of vapor bubbles in the liquid) and a significant reduction in the flow rate. This can damage the pump over time and lead to poor performance.

Correct Answer: A) It reduces the water pressure at the pump inlet

Explanation: A blockage reduces the pressure at the pump inlet, causing the liquid to vaporize and form bubbles (cavitation). This phenomenon can damage the pump and drastically reduce its efficiency.

Correct Answer: B) It prevents the pump from moving water efficiently, drastically reducing performance

Explanation: If the pump is rotating in the wrong direction, it cannot move water effectively. The design of the impeller and volute is directional, meaning incorrect rotation results in poor or no pumping action.

Correct Answer: B) The pump will lose its prime and fail to pump water effectively

Explanation: An air leak in the suction line allows air to enter the pump, which can cause it to lose its prime (the ability to draw water). Without proper priming, the pump cannot effectively move water, leading to poor performance.

Correct Answer: A) Increased noise and vibration

Explanation: A worn impeller may cause the pump to vibrate and make more noise due to the imbalance and reduced efficiency in moving water. This is a common indicator of impeller wear.

Correct Answer: A) Air in the suction line reduces the vacuum needed to draw water into the pump

Explanation: The presence of air in the suction line disrupts the vacuum necessary to draw water into the pump, causing the pump to lose its prime and become ineffective at moving water.

Correct Answer: B) It decreases the pump's ability to move water, reducing flow and pressure

Explanation: A worn impeller cannot effectively move water, leading to a reduction in flow rate and pressure. The impeller is a critical component that drives water through the pump, so wear can significantly impact pump performance.

Correct Answer: B) It restricts water flow, reducing the pump’s performance

Explanation: A clogged impeller or pump casing restricts water flow, making it difficult for the pump to move water effectively. This blockage can significantly reduce the pump's efficiency and overall performance.