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Which of the figures shown in the options is an F-head engine as per valve arrangement (SV is suction valve, whereas EV is Exhaust valve)?

Which of the figures shown in the options is an F-head engine as per valve arrangement (SV is suction valve, whereas EV is Exhaust valve)? Correct Answer <img alt="F3 Kumar.R 02-11-21 Savita D17" src="//storage.googleapis.com/tb-img/production/21/11/F3_Kumar.R_02-11-21_Savita_D17.png" style="width: 229px; height: 366px;">

Explanation:
The internal combustion (I.C.) engines are classified according to the position and arrangement of the intake and exhaust valves. This classification depends on whether the valves are in the cylinder block or in the cylinder head. Various arrangements have been used among which the most common are the L-head, T-head, I-head, and F-head.

F-head:

In the F-head engine, the intake valves normally are located in the head, while the exhaust valves are located in the engine block. This arrangement combines, in effect, the L-head and the I-head valve arrangements. The valves in the head are actuated from the camshaft through tappets, push rods, and rocker arms (I-head arrangement), while the valves in the block are actuated directly from the camshaft by tappets (L-head arrangement).

[ alt="F3 Kumar.R 02-11-21 Savita D17" src="//storage.googleapis.com/tb-img/production/21/11/F3_Kumar.R_02-11-21_Savita_D17.png" style="width: 229px; height: 366px;">

L-head: 

In the L-head engines, both valves are placed in the block on the same side of the cylinder. The valve-operating mechanism is located directly below the valves, and one camshaft actuates both the intake and exhaust valves.

[ alt="F3 Kumar.R 02-11-21 Savita D20" src="//storage.googleapis.com/tb-img/production/21/11/F3_Kumar.R_02-11-21_Savita_D20.png" style="width: 180px; height: 281px;">

T-head:

If one valve on each side of the cylinder is used, as a modification to the above arrangement, it is called a T-head engine and the arrangement uses two camshafts for the operation of valves.

[ alt="F3 Kumar.R 02-11-21 Savita D19" src="//storage.googleapis.com/tb-img/production/21/11/F3_Kumar.R_02-11-21_Savita_D19.png" style="width: 248px; height: 278px;">

I-head:

Engines using the I-head construction are called valve-in-head or overhead valve engines, because the valves mount in a cylinder head above the cylinder. This arrangement requires a tappet, a push rod, and a rocker arm above the cylinder to reverse the direction of the valve movement. Only one camshaft is required for both valves. Some overhead valve engines make use of an overhead camshaft. This arrangement eliminates the long linkage between the camshaft and the valve.

[ alt="F3 Kumar.R 02-11-21 Savita D18" src="//storage.googleapis.com/tb-img/production/21/11/F3_Kumar.R_02-11-21_Savita_D18.png" style="width: 209px; height: 304px;">

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