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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: 7 - 16 of 28Next page of topicsPreviousNextNext page of topicsAllView as Outline
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 #7   Mar 21, 2005 5:41 am
Rob,

You did very well.  12 out of 16. 

2.     2) 25HP

3)     30%

7)     D) either A or B

12.)     B) Eugene Lebon

Those seem to be the ones that trip up everyone.  It's still early here or I'd post all the asnwers together - but they can just read yours and then read this one.

Congrats on being brave.

Sherri

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


Appreciate what you have already been blessed with.


Joined: Sep 16, 2002
Points: 2793

Re: Internal Combustion Engines
Reply #8   Mar 21, 2005 7:55 pm
OK, I am going to embarrass myself but here goes.

1. T

2. D

3.  80%

4.  F

5.  5

6.  C

7.  C

8.  F

9.  T

10.  Hot Water?

11.  T

12.  D

13.  T

14.  T

15.  Water

16.  T

That was fun.  Also made me realize I don't know much about this stuff lol.....

Glad I have a carreer or I would be in trouble lol.....



Honda 928TA, Ariens 924 STE, Toro single stage S-620, 95 Jeep Wrangler with a 6 foot Fisher Plow, many shovels, one 14 year old boy.  Craftsman 01 1000 LTX pimp Gold LT 20hp Briggs OHV V-twin.  Tough as it is ugly.
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 #9   Mar 22, 2005 5:36 am
ChrisS,

Yeah you would be in a little trouble.  8/16, 2. d  3. 30% 4.T 5.I'm not sure what the 5 is for 7.d 10. hot water is good, but it's steam, 11. F 12. B

I'll try the next test later.

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 #10   Mar 22, 2005 6:05 am
Miss SS,

Just some thing to think about on your questions.

When you have enough BTU"s you will change water to steam, otherwise just hot water!!! I hope you don't get burned  when you take a shower. Rember you have added heat to the water in your water heater, but no steam!! Question should be rewritten. Same with #15. go from a temp of 30 below to 10 below, you have added heat, but you still have ICE!

                                                              Fred       

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 
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 #11   Mar 22, 2005 4:43 pm
jubol wrote:
Miss SS,

Just some thing to think about on your questions.

When you have enough BTU"s you will change water to steam, otherwise just hot water!!! I hope you don't get burned  when you take a shower. Rember you have added heat to the water in your water heater, but no steam!! Question should be rewritten. Same with #15. go from a temp of 30 below to 10 below, you have added heat, but you still have ICE!

                                                              Fred       


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

If you don't have free speech, what do you have?
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 #12   Mar 22, 2005 4:47 pm
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

If you don't have free speech, what do you have?
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 #13   Mar 22, 2005 5:02 pm
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

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 
18Degrees


Joined: Jan 19, 2005
Points: 111

Re: Internal Combustion Engines
Reply #14   Mar 22, 2005 6:02 pm

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



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

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