Answer:
The weights of paper used for coated abrasive backings are designated by the letters A, C, D and E
Explanation:
The letter designation of the weights of paper backings for different applications are;
'A' Weight - Paper meant for use in finishes in abrasive projects. The paper is light (weight) touch grade of abrasive paper
'C' Weight - The 'C' designated paper is the medium light grade which offers more strength and bendability and it is suitable for woodwork by a cabinet maker
'D' Weight - The 'D' weight category is a medium heavy paper
'E' Weight - The 'E' weight category is a strong paper category, used for discs, coarse sheets, and belts
Therefore, the letters A, C, D and E are used to designate the weights of paper used for coated abrasive backings.
Which of these fuel injection systems operates with fuel injectors located only in the intake manifold near each intake
valve and sprays fuel toward the valve?
Select one:
A. Central-point injection
O B. Throttle body injection
C. Multipoint fuel injection
D. Gasoline direct injection
Answer:
C. Multipoint fuel injection
Explanation:
A fuel injection system can be defined as a system found in the engine of most automobile cars, used for the supply of a precise amount of fuel or fuel-air mixture to the cylinders in an internal combustion engine through the use of an injector.
There are different types of fuel injection system and these includes;
I. Central-point injection.
II. Throttle (single point) body injection.
III. Gasoline direct injection.
IV. Multipoint (port) fuel injection.
Multipoint fuel injection is a type of fuel injection system that operates with fuel injectors located only in the intake manifold near each intake valve and sprays fuel toward the valve. As a result, it allows for the supply of a precise amount of fuel and as such creating a better air-fuel ratio for automobile cars.