MDE 17 End of Unit Quiz

Answer: C) Automatic slip during overload conditions

Explanation:
Fluid couplings can automatically slip during overload conditions, which helps to protect the engine and drivetrain from damage due to excessive torque. This slipping action absorbs the shock and prevents mechanical damage.

Answer: B) Smooth torque transmission without shock loads

Explanation:
Fluid couplings provide smooth torque transmission, which helps to prevent shock loads on the propulsion system. This is one of the key advantages over mechanical clutches, which may transmit torque more abruptly.

Answer: B) Enhanced vibration damping capability

Explanation:
Fluid couplings help to dampen vibrations between the engine and the propulsion shaft, leading to smoother operation and reduced wear on the system components.

Answer: B) It will decrease torque transmission capability due to reduced fluid viscosity

Explanation:
Increased oil temperature decreases the fluid's viscosity, which can lead to decreased torque transmission capability and increased slip within the fluid coupling.

Answer: A) Stator

Explanation:
The stator in a fluid coupling helps to redirect and manage the flow of coupling fluid between the impeller and the turbine, improving efficiency and torque transfer.

Answer: C) Enhanced torque transmission and reduced slip

Explanation:
Increasing the oil flow between the impellors in a fluid coupling enhances torque transmission and reduces slip. This results in more efficient power transfer from the engine to the propulsion shaft. However, while increasing oil flow improves performance, it can also lead to increased fluid temperature and requires proper management to avoid overheating.

Answer: B) To transfer torque between the engine and the gearbox

Explanation:
The coupling fluid is crucial for transferring torque between the engine and the gearbox. It facilitates the hydraulic connection that allows power to be transmitted smoothly.

Answer: C) It decreases the life expectancy due to increased wear and tear

Explanation:
Angular misalignment causes uneven wear and additional stress on the components, which can decrease the life expectancy of the fluid coupling by accelerating wear and potentially causing failure.

Answer: C) To receive fluid flow from the impeller and transmit torque to the gearbox

Explanation:
The turbine in a fluid coupling receives the fluid flow from the impeller and transmits torque to the gearbox, effectively transferring power between the engine and the gearbox.

Answer: B) Impeller

Explanation:
The impeller is a primary component of a fluid coupling. It is responsible for creating the flow of coupling fluid, which transmits torque between the engine and gearbox.

Answer: C) Improve the cooling system to manage oil temperature

Explanation:
To manage the effects of high oil temperature, improving the cooling system is a common action. This helps maintain the oil at an optimal temperature and ensures efficient operation of the fluid coupling system.

Answer: B) Adjust the alignment of the shafts to the manufacturer’s specifications

Explanation:
To correct angular misalignment, adjusting the alignment of the shafts to meet the manufacturer’s specifications is essential. This helps in reducing vibrations, preventing damage, and ensuring optimal performance.