Aux 1 Unit 3 Q5

1 / 10

What is the primary function of a relief valve in a fuel supply pump system?

A) To regulate the fuel flow to the engine

B) To prevent excessive pressure build-up in the fuel system

C) To filter out impurities from the fuel

D) To mix fuel with air before combustion

2 / 10

In a relief valve suitable for a fuel supply pump, what component is responsible for maintaining the set pressure before the valve opens?

A) The valve seat

B) The spring

C) The valve body

D) The diaphragm

3 / 10

What happens when the pressure in the fuel supply system exceeds the set limit of the relief valve?

A) The valve disc lifts off the seat, allowing fuel to bypass the pump and return to the tank

B) The valve disc remains closed to prevent fuel leakage

C) The spring tightens to increase the pressure further

D) The valve body expands to accommodate the excess pressure

4 / 10

Which material is typically used for the valve seat in a relief valve designed for fuel systems, and why?

B) Rubber, because it is flexible and provides a good seal

C) Plastic, because it is lightweight and easy to mold

D) Steel, because it can withstand high temperatures and pressures

5 / 10

What is the role of the valve disc in a fuel system relief valve?

A) To control the amount of fuel being pumped

B) To seal the valve when closed and lift off the seat when pressure is too high

C) To regulate the temperature of the fuel

D) To act as a filter for impurities in the fuel

6 / 10

How is the set pressure of a relief valve in a fuel supply system typically adjusted?

A) By changing the valve body material

B) By adjusting the tension on the spring

C) By replacing the valve disc

D) By altering the shape of the valve seat

7 / 10

Why is it important for a relief valve in a fuel supply system to have a quick response time?

A) To prevent excessive fuel consumption

B) To ensure the engine receives fuel at a consistent temperature

C) To immediately relieve excess pressure and prevent damage to the fuel pump or other components

D) To enhance the fuel's combustion efficiency

8 / 10

What is the purpose of the valve body in a relief valve used in a fuel supply system?

A) To filter impurities from the fuel

B) To house and protect the internal components

C) To cool the fuel before it reaches the engine

D) To direct fuel to the combustion chamber

9 / 10

In the operation of a relief valve, what ensures that the valve reseats correctly after relieving excess pressure?

A) The valve disc shape

B) The tension of the spring

C) The material of the valve body

D) The position of the valve in the system

10 / 10

What would likely happen if the relief valve in a fuel supply system failed to operate correctly?

A) The fuel system would maintain optimal pressure levels

B) Excessive pressure could build up, potentially damaging the fuel pump or causing a fuel leak

C) The engine would receive an increased flow of fuel, improving performance

D) The valve would automatically adjust to maintain fuel quality

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