In a four-stroke engine, the component located between the lobe and the valve stem is called the a. margin. b. retainer. c. tappet. d. seat.

The answer is option C -Tappet.

Step-by-step explanation:

The four-stroke engine is the most common types of internal combustion engines and is used in various automobiles like cars, trucks etc.

In a four-stroke engine, the component located between the lobe and the valve stem is called the tappet.

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.