Aux 1 Unit 6 Q1

1 / 10

Why is the control air pressure typically set higher than the minimum necessary to operate the control equipment?

D) To reduce the noise generated by the control system

B) To increase the power consumption of the control system

C) To speed up the operation of the control equipment

A) To ensure there is a sufficient margin for pressure drops in the system

2 / 10

How does setting the control air pressure slightly above the necessary operational pressure contribute to system reliability?

C) It ensures consistent and reliable operation of the control equipment even if there are minor fluctuations in system pressure

A) It allows the system to operate in a wider range of environmental conditions

D) It increases the flow rate of the air in the system

B) It prevents the control system from overloading

3 / 10

Why is the pressure used for control air lower than that used for starting air in marine systems?

D) Higher pressure would be inefficient for control air systems

A) Control air systems require less force to operate the control equipment effectively

C) Control air systems are not designed to handle high pressures

B) Lower pressure is necessary to prevent damage to control equipment, which is typically more delicate than engine components

4 / 10

What would likely happen if the starting air pressure were significantly lower than 30 bar?

C) The engine would operate at higher efficiency

B) The engine might fail to start due to insufficient force to turn the engine over

A) The engine would start more quickly

D) The engine components would wear out faster

5 / 10

How does the high starting air pressure contribute to the reliability of marine engines?

A) It ensures continuous operation without maintenance

D) It decreases the overall size of the engine

B) It guarantees that the engine can be started even under cold or challenging conditions

C) It reduces fuel consumption during operation

6 / 10

What is the typical pressure used for starting air in marine compressed air systems?

D) 50 bar

B) 15 bar

A) 10 bar

C) 30 bar

7 / 10

How does using a lower control air pressure help ensure the reliability of the control system?

A) It increases the speed of control operations

C) It minimizes the wear and tear on control components, enhancing longevity and reliability

D) It increases the force applied to the control devices

B) It reduces the risk of leaks in the system

8 / 10

What could happen if control air pressure were set as high as starting air pressure (e.g., 30 bar)?

A) The control system would operate more smoothly

D) The control system would require less maintenance

B) The control equipment could be damaged or fail due to excessive pressure

C) The overall efficiency of the control system would improve

9 / 10

What is the typical pressure used for control air in marine compressed air systems?

B) 10 bar

A) 5 bar

D) 30 bar

C) 20 bar

10 / 10

Why is a pressure of 30 bar necessary for starting air in marine engines?

C) To lubricate the engine components before startup

B) To provide sufficient force to overcome the inertia and compression resistance of large diesel engines

A) To ensure rapid cooling of the engine

D) To reduce the noise levels during engine startup

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