Automotive, not a lazy student. I just really need help!?

Question

. Two auto technicians are discussing the stages of engine operation. Auto Technician A says during the intake stage of engine operation, the intake valve is open and the piston is moving upward in the cylinder. Auto Technician B says the intake stage of engine operation is directly followed by the power stage. Which of the following statements is correct?
A. Only Technician A is correct.
B. Only Technician B is correct.
C. Both Technician A and Technician B are correct.
D. Neither Technician A nor Technician B is correct.

I know that C is incorrect! Please help

Answer 1

ans. D. piston moves downward on intake stroke as int. valve is opening.........intake 'stage' is followed by compression stroke. 4 stroke...intake...compression .....power ...exhaust.......

Answer 2

Actually you need to know what type of automotive engine you are working on. This is critical.

For the standard Otto cycle engine, the proper answer id D. Neither is correct.

However if your are working on an Atkins cycle or Miller cycle engine, then Technician A can technically be said to be correct. Both Miller and Atkins cycle engines leave the intake valve open and it remains open during part of what is standardly know in the Otto cycle as the compression stroke.

I don't believe that Technician B can ever be considered correct, though the line is blurred if you considered a two stroke engine on what is considered intake, and what is considered compression.

And where are these other combustion cycles used?
Miller: Used in a variety of engines, the Mazda Millenium is most recognized.
Atkins: Used by Hybrid vehciles.
Two-stroke: Being developed by a variety of car companies, Hyundai is the most recent that I've heard of to actually meet or exceed emissions requirements in CA.

Answer 3

Absolutely D.
Assuming in the first place we are talking about a four stroke engine.
During the intake stage, the intake valve is open to allow fuel inside, and the piston is moving downwards to create suction.
The intake stage is followed by the combustion stage.
The correct sequence is the suction, intake, combustion and the exhaust stage.

Answer 4

D: Both wrong

Piston is moving down during the intake stage

Four stages (strokes) in correct order:
Intake
Compression
Power
Exhaust

Answer 5

During the intake stage the piston is moving down in the
cylinder to draw in air. The intake stage is directly followed
by the compression stage THEN by the power stage. It
seems to me that D is the answer.

Answer 6

answer is D
at intake stage the piston is moving down, the intake valve opens to allow the air fuel mix into the cylinder.
engine operation is as follows, Intake,compression,power,exhaust

Answer 7

D is the correct answer. If the intake valve is open the piston is going down and drawing the fuel charge into the cylinder.
The intake stroke is followed by the compression stroke.

Answer 8

B is probably the answer.

Intake stage is when fuel is introduced to the cylinder and the piston will be on the down stroke.
Power will be generated when the piston is on the up stroke to ignite fuel and cause combustion, therefore causing power.

Answer 9

D is correct. The piston moves downward during the intake stroke and the compression stroke follows the intake stroke.

Answer 10

B. Intake,Power,exhaust. All above me are wrong because the piston is moving down on intake stroke not up as the question asks.

Answer 11

It just depends on if you are working on a 2 stroke or 4 stroke engine. this could be a trick question to make you think further into the picture. They are both wrong on a four stroke motor but both right on a 2 stroke.