Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

A few of you may know that I'm a leader in 4-H for the small engines project in our club.  Here's some of the questions I'm asking the 12-18 year old this year.  There are 3 girls and 2 boys this year.  Let's see how you guys/gals stack up.

1.     T or F     An engine is a machine that converts a form of energy into mechanical force.

2.     Small engines are generally rated up to _______ HP.  A) 20     B) 25     C) 30     D) neither A, B or C

3.     Approximately ______% of the energy relaesed when fuel is oxidized in a typical small engine is converted into useful work.

4.     T or F     Heat is the resource that provides the capicity to do work.

5.     T or F     A substance can be in solid, liquid or gas state.

6.     Three methods of heat transfer are ______.     A) conduction, convection and locomotion     B) conduction, radiation and locomotion     C) conduction, convection and radiation     D) neither A, B or C

7.     Horsepower is a unit of power equal to _____.     A) 746W     B) 33,000 lb-ft/min     C) neither A or B     D) either A or B

8.     T or F     Both 4 stroke and 2 stroke engines complete 4 distinctive events during each cycle.

9.     T or F     Small engines are either air-cooled or liquid-cooled.

10.     When heat is added to water, it changes to ________.

11.     T or F     Generators and snow throwers commonly use a verticla shaft, horizontal cylinder engine.

12.     The first successful gasoline engine was developed by _______.     A) Thomas Savery     B) Eugene Lebon     C) James Watt     D) Neither A, B or C

13.     T or F     Kinetic energy is energy of motion.

14.     T or F     Small engines are either spark ignited or compression ignition based on how the fuel is ignited.

15.     When heat it added to ice, it changes to ________>

16.     T or F     The size of lawn tractor engines commonly range from 11 to 18 HP.

Let's see how you do and I'll post the answers later this week.

Sherri

jubol wrote:

Fred you are right about adding heat to water, but if I go from 30 below to 10 above, I'm gonna have water (Canada = celcius).

Sherri

Answers to the above questions. (according to the book I read)

1.     T

2.     B

3.     30%

4.     T

5.     T

6.     C

7.     D

8.     F

9.     T

10.     steam

11.     F

12.     B

13.     T

14.     T

15.     water

16.     T

I'll post another test later.

Sherri

na na na naa...

im a master tech and you guys are zip.

i am so gonna burn for that one...he its gettin kinda hot in here  

later chris...aka master tech

I take issue with the false answer.

Even though the rotaion is in half-there are still 4 events that happen (fuel in-compression-power-exhaust) for 2 stroke.

4 stroke=suck-squeeze-pop-poohie    

18 degrees

MissSnowshoveler wrote:

notice that no one ever goes out for Canadian food.

18Degrees wrote:

Even though there are 4 events in both only the 4 stroke utilises 1 stroke for each event.  The 2 stroke utilises 2 events for each stroke.  So there isn't a distinct intake, compression, power, exhaust in the 2 stroke as they are doubled up, intake/compression and power/exhaust.

I just confused myself, so I hope your happy.  I can see the difference in the engines, but to put into words is something else.  maybe Snowshoveler will grace me with a better worded response. 

Sherri

 Miss SS,

 Even a turbo jet engine is  a 4 cycle engine!!!

It does not even have a piston , intake or exhuast valves!!

                                                    Fred                  

congradulations 18Degrees...miss snowshoveler has officially put you in the corner with a pointy hat on your head .

you might know better than to try to reason with a woman,even if you are right. i would have thought you would have learned that from Paula,she dosent take any prisoners.

so while your here ...you a  er want a beer or what,we wont tell the MISS okay.

later chris

Mrs. Sherri---Not many could have described the two stroke and the four stroke cycle.   I think you deserve an A +  on that information.   That two stroke , especially, amazes me. My group at the Vo-tech  school would take one of the better named chain saws and lean it to run  14,000 rpm,s.   Quite a few of them will rev that high.  Then I would divide by 60 to see how many cycles per second.  It came to  233 cycles per second.  Unreal, and a good 2 stroke will just run for years if proper gas and oil mixture is used.  I guess one reason, it changes oil every two strokes.   Take care and may we hear more from you---Your friend--Will

ha ha ha    It is always frustrating when english teahers write math or tech questions=they don't understand math or tech "enuff" to use the proper words!

my $.02 worth                                                                18  degrees