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MissSnowshoveler


If you don't have free speech, what do you have?

Location: NS
Joined: Feb 5, 2005
Points: 706

Internal Combustion Engines
Original Message   Mar 20, 2005 6:09 pm
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

If you don't have free speech, what do you have?
Replies: 15 - 24 of 28Next page of topicsPreviousNextNext page of topicsAllView as Outline
18Degrees


Joined: Jan 19, 2005
Points: 111

Re: Internal Combustion Engines
Reply #15   Mar 22, 2005 6:03 pm
MissSnowshoveler 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



notice that no one ever goes out for Canadian food.

18 Degree driveway - 928 Honda track drive - Fertilizer spreader for dispensing salt
MissSnowshoveler


If you don't have free speech, what do you have?

Location: NS
Joined: Feb 5, 2005
Points: 706

Re: Internal Combustion Engines
Reply #16   Mar 22, 2005 6:26 pm
18Degrees wrote:
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

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

If you don't have free speech, what do you have?
jubol


Location: Dover, De
Joined: Oct 3, 2003
Points: 1558

Re: Internal Combustion Engines
Reply #17   Mar 22, 2005 6:29 pm
 Miss SS,

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

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

                                                    Fred                  

This message was modified Mar 22, 2005 by jubol


Husqvarna STE927(11.5HP) snowblower,  MTD Pro Series 18/42 Lawnmower, MTD 6.5 HP  Self Prop Lawn Mower,  Weedeater 1500 Blower, Web Gensis  2000 
snowshoveler


tides in dirts out surfs up

Location: bridgewater nova scotia...aka the swamp
Joined: Jan 3, 2003
Points: 1261

Re: Internal Combustion Engines
Reply #18   Mar 22, 2005 6:35 pm
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

craftsman 10/28 snowblower with tracks   husky 372xpg chainsaw   sachs dolmar bc212 bushsaw   mondo trimmer   monster tractor with trailer    cheep wheelbarro and couple shovels and a partridge in a pear tree 
pecanmanwill


got a dog named Devon and a cat named Scooter and a She cat named Fluffy

Joined: Dec 3, 2002
Points: 677

Re: Internal Combustion Engines
Reply #19   Mar 22, 2005 6:42 pm
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

Will--sometimes called pecanmanwill
18Degrees


Joined: Jan 19, 2005
Points: 111

Re: Internal Combustion Engines
Reply #20   Mar 27, 2005 9:04 pm
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

18 Degree driveway - 928 Honda track drive - Fertilizer spreader for dispensing salt
nibbler


Joined: Mar 5, 2004
Points: 751

Re: Internal Combustion Engines
Reply #21   Mar 28, 2005 11:14 am
MissSnowshoveler wrote:

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.

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

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.

Just to pick a few nits

Typos

3. released

4. capacity

Nits

5. There is at least one other state of matter, a plasma. Physicists keep inventing others as they play their math games.

11. Most small engine generators are horizontal shafts. Most generators are run by the utility company and I suspect they are mostly vertical shaft, I'm not sure. I'm thinking in terms of "kilograms (pounds) of generator". as "most"

13. Kinetic energy is the energy in an object that is associated with its motion. A battery in a moving car has potential energy stored inside it and kinetic energy due to its being in motion. The potential energy is moving but is not due to the motion. Another way to look as it is to think of a baseball that is dropped from the top of the empire state building. It starts at rest with a lot of potential energy and no kinetic, its way up high. As it falls the potential energy is turned into kinetic, it gets lower and lower but is travelling faster and faster.

14. Small internal combustion engines normally work that way. Small steam  engines and pneumatic tools both work from an external energy supply. I also have a vague recollection of something called a Stirling Engine that used an external heat source but worked by heating and cooling a gas ( not gasoline)..

Nice set of questions, they have generated some good discussion. How did the young adults do?
nibbler


Joined: Mar 5, 2004
Points: 751

Re: Internal Combustion Engines
Reply #22   Mar 28, 2005 11:17 am
18Degrees wrote:
notice that no one ever goes out for Canadian food.

I've seen a number of restaurants that specialize in "Canadian" food. Typically they also have Chineese as well.
MissSnowshoveler


If you don't have free speech, what do you have?

Location: NS
Joined: Feb 5, 2005
Points: 706

Re: Internal Combustion Engines
Reply #23   Mar 28, 2005 4:35 pm
I’m not sure how many small engines out there run on plasma - but when you find one, please send one to me - I’d be glad to see what it looks like and hear how it runs. (There shouldn't be an 'a' in front of plasma)
 
Not quite sure where you live - but the generators that we are selling around here are horizontal shafts and they aren’t used by the utility companies either. The generators used by the utility company here are large steam turbines that use coal so I’m sure that they aren’t going to be bring them into our small engine repair shop for servicing. (There should either be no period or a capital 'A' at the end of your statement)
Kinetic Energy, energy possessed by an object, resulting from the motion of that object. The relationships between kinetic and potential energy and among the concepts of force, distance, acceleration, and energy can be illustrated by the lifting and dropping of an object. (Traveling has one ‘l’ - not 2, good to see you’re perfect all the time.)
 
You notice that the name of the thread is Internal Combustion Engines and it mostly pertains to small engines? It has nothing to do with steam engines and pneumatic tools. It’s just questions taken from a work book that I have read and answered the questions to. Yes they have brought in some good discussion and they are meant to make you stop, think and learn. (You have added an extra space between steam and engines, so really, I'm glad to see that you are perfect, no really, honest I am)
 
As for the 12 - 18 year olds, well they have done extremely well so far this year, they of course get all the questions, not just the few that I post here, so they have a better chance of understanding how all the questions relate to small engines. As I couldn’t draw the pictures that they get to see - I couldn’t exactly post those questions. But for their age they are wonderful and willing to do the research to find the answers they are looking for.  What else could you ask for the young people of today?
 
Sherri
PS - Chinese only has one 'e'.


If you don't have free speech, what do you have?
18Degrees


Joined: Jan 19, 2005
Points: 111

Re: Internal Combustion Engines
Reply #24   Mar 28, 2005 8:03 pm
nibbler wrote:
11. Most small engine generators are horizontal shafts. Most generators are run by the utility company and I suspect they are mostly vertical shaft, I'm not sure.

In the two power plants i have worked in- vertical shaft for Hydroelectric (smaller gen-sets than steam)

                             -horizontal for the big steam turbines.

                                                18 degrees=poor speller

This message was modified Mar 28, 2005 by 18Degrees


18 Degree driveway - 928 Honda track drive - Fertilizer spreader for dispensing salt
Replies: 15 - 24 of 28Next page of topicsPreviousNextNext page of topicsAllView as Outline
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