July All Topic
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
1) Indicated Horsepower is the amount of HP delivered to the top of the piston during combustion and is mathematically calculated. What is Brake Horsepower.
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
3) 2100/60 = 35
4) TDC/BDC
Posting Guru
Joined: Jul 2009
Posts: 1,005
Likes: 0
From: Ventura, CA
Trivia Time:
5) Ambient air contains approx. __ % Oxygen. An exhaled breath contains __ % Oxygen.
10) What is the smallest country?
Vatican City is excluded for this question.
This is borederline on a trick question, as the country is not recognized by all sovereign nations, while others have recognized it. There is a fun story behind it for anyone who knows it.
5) Ambient air contains approx. __ % Oxygen. An exhaled breath contains __ % Oxygen.
10) What is the smallest country?
Vatican City is excluded for this question.
This is borederline on a trick question, as the country is not recognized by all sovereign nations, while others have recognized it. There is a fun story behind it for anyone who knows it.
Smallest country is SeaLand, a little island off of Great Britain
The Pacifier
Joined: Jan 2003
Posts: 8,245
Likes: 7
From: Cloverdale, BC
Trivia Time:
1) Indicated Horsepower is the amount of HP delivered to the top of the piston during combustion and is mathematically calculated. What is Brake Horsepower.
2) What is the difference between Indicated Horsepower and Brake Horsepower called?
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
1) Indicated Horsepower is the amount of HP delivered to the top of the piston during combustion and is mathematically calculated. What is Brake Horsepower.
2) What is the difference between Indicated Horsepower and Brake Horsepower called?
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
2) The difference is theoretic vs actual. Or maybe parasitic loss.
3) 70 strokes per second
4) top dead center, bottom dead center.
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
FlashMob on Ol' Cape Cod
This happened last Friday on Cape Cod.
Really cool, and just in time for this last weekend!
YouTube - ‪Flash Mob at Cape Cod Stop and Shop‬‏
Pop
Really cool, and just in time for this last weekend!
YouTube - ‪Flash Mob at Cape Cod Stop and Shop‬‏
Pop
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
Elder User
Joined: Jun 2007
Posts: 807
Likes: 0
From: Cypress,Ca.
This happened last Friday on Cape Cod.
Really cool, and just in time for this last weekend!
YouTube - Flash Mob at Cape Cod Stop and Shop
Pop
Really cool, and just in time for this last weekend!
YouTube - Flash Mob at Cape Cod Stop and Shop
Pop
Elder User
Joined: Jan 2011
Posts: 567
Likes: 1
From: Northern CO
I've always wanted to do one of those.
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Posting Guru
Joined: Jan 2011
Posts: 2,315
Likes: 0
From: Rossmoor at Seal Beach
FTE Leadership Emeritus
Joined: Aug 2007
Posts: 42,085
Likes: 6
From: Lakewood, Ca.
That's true...and that constitutes 2 revolutions.
The question is kind of confusing ...and I believe intentionally misleading(to me, anyway
)
I don't really see the relevance of it being a 4 stroke motor, since the question asks about a single stroke. A single revolution of the crank is still a single revolution of the crank, and a piston goes up once and down once during each revolution whether it's a 2 stroke or 4 stroke, and a single stroke is one half of a revolution.
The question is kind of confusing ...and I believe intentionally misleading(to me, anyway
)
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds.
Last edited by SteveBricks; Jul 5, 2011 at 12:42 PM.
Posting Guru
Joined: Jan 2011
Posts: 2,315
Likes: 0
From: Rossmoor at Seal Beach
That's true...and that constitutes 2 revolutions.
The question is kind of confusing ...and I believe intentionally misleading(to me, anyway)
I don't really see the relevance of it being a 4 stroke motor, since the question asks about a single stroke. A single revolution of the crank is still a single revolution of the crank, and a piston goes up once and down once during each revolution...be it 2 stroke or 4 stroke, so a single stroke is one half of a revolution.
The question is kind of confusing ...and I believe intentionally misleading(to me, anyway
)I don't really see the relevance of it being a 4 stroke motor, since the question asks about a single stroke. A single revolution of the crank is still a single revolution of the crank, and a piston goes up once and down once during each revolution...be it 2 stroke or 4 stroke, so a single stroke is one half of a revolution.
The 4 stroke only fires the piston every other revolution, of the crank so if it is running at 2100 it is firing each piston 1050 times per minute, which would be 17.5 times per second... yes the question is very misleading!
9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
Trivia Time:
1) Indicated Horsepower is the amount of HP delivered to the top of the piston during combustion and is mathematically calculated. What is Brake Horsepower.
Brake horsepower refers to the amount of usable power delivered by the engine to the
crankshaft.
2) What is the difference between Indicated Horsepower and Brake Horsepower called?
Indicated horsepower can be as much as 15% higher than brake horsepower.
The difference is due to internal engine friction, combustion inefficiencies, and parasitic
losses. The ratio of an engine's brake horsepower and its indicated horsepower is called the
mechanical efficiency of the engine. The mechanical efficiency of a four-cycle diesel is
about 82 to 90 percent.
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
If a four-stroke engine running at a constant 2100
revolutions per minute (rpm), the crankshaft would be rotating at 35 revolutions, or
12,600 degrees, per second. One stroke is completed in about 0.01429 seconds.
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
The highest point of travel by the
piston is called top dead center (TDC), and the lowest point of travel is called bottom
dead center (BDC). There are 180* of travel between TDC and BDC, or one stroke.
Change of topic so no one person can dominate the trivia game!
5) Ambient air contains approx. __ % Oxygen. An exhaled breath contains __ % Oxygen.
21%, 16%
6) What is considered "normal" blood pressure levels for an adult?
120/80 mmHg
7) During CPR of a person with no pulse present, the rescuer will compress the chest creating a pulse, and there for a blood pressure. If that blood pressure were measured, what would the blood pressure be?
15/0 mmHg
8) Statistically, what day of the week are you most likely to be struck by lightning?
Sunday
BONUS QUESTIONS!
9) What magazine did Huge Hefner work for as circulation manager, while raising funds to start Playboy?
Children' Activities magazine
10) What is the smallest country?
Vatican City is excluded for this question.
This is borederline on a trick question, as the country is not recognized by all sovereign nations, while others have recognized it. There is a fun story behind it for anyone who knows it.
Sealand (someone got this right!!)
1) Indicated Horsepower is the amount of HP delivered to the top of the piston during combustion and is mathematically calculated. What is Brake Horsepower.
Brake horsepower refers to the amount of usable power delivered by the engine to the
crankshaft.
2) What is the difference between Indicated Horsepower and Brake Horsepower called?
Indicated horsepower can be as much as 15% higher than brake horsepower.
The difference is due to internal engine friction, combustion inefficiencies, and parasitic
losses. The ratio of an engine's brake horsepower and its indicated horsepower is called the
mechanical efficiency of the engine. The mechanical efficiency of a four-cycle diesel is
about 82 to 90 percent.
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
If a four-stroke engine running at a constant 2100
revolutions per minute (rpm), the crankshaft would be rotating at 35 revolutions, or
12,600 degrees, per second. One stroke is completed in about 0.01429 seconds.
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
The highest point of travel by the
piston is called top dead center (TDC), and the lowest point of travel is called bottom
dead center (BDC). There are 180* of travel between TDC and BDC, or one stroke.
Change of topic so no one person can dominate the trivia game!
5) Ambient air contains approx. __ % Oxygen. An exhaled breath contains __ % Oxygen.
21%, 16%
6) What is considered "normal" blood pressure levels for an adult?
120/80 mmHg
7) During CPR of a person with no pulse present, the rescuer will compress the chest creating a pulse, and there for a blood pressure. If that blood pressure were measured, what would the blood pressure be?
15/0 mmHg
8) Statistically, what day of the week are you most likely to be struck by lightning?
Sunday
BONUS QUESTIONS!
9) What magazine did Huge Hefner work for as circulation manager, while raising funds to start Playboy?
Children' Activities magazine
10) What is the smallest country?
Vatican City is excluded for this question.
This is borederline on a trick question, as the country is not recognized by all sovereign nations, while others have recognized it. There is a fun story behind it for anyone who knows it.
Sealand (someone got this right!!)
Source:
1-4: Department of Energy Fundamentals Handbook, Mechanical Science Vol. 1
5-8: EMT Class
9: Dunno. Just knew it.
10: HowStuffWorks.com Podcast
Senior User
Joined: Jun 2011
Posts: 123
Likes: 0
From: Inland Empire, CA
Mark.
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
3) A 4-stroke motor operating at a constant 2100 RPM will complete a single stroke every ____ seconds. (A calculator is permitted)
If a four-stroke engine running at a constant 2100
revolutions per minute (rpm), the crankshaft would be rotating at 35 revolutions, or
12,600 degrees, per second. One stroke is completed in about 0.01429 seconds.
If a four-stroke engine running at a constant 2100
revolutions per minute (rpm), the crankshaft would be rotating at 35 revolutions, or
12,600 degrees, per second. One stroke is completed in about 0.01429 seconds.
At 2,100 revolutions per minute (RPM) the engine would be rotation 35 times per second. But is a revolution a stroke? We refer to compression stroke, exhaust stroke, intake stroke, power stroke, etc. Implying that a stroke is different than a revolution. To be correct, one could say that there are 17.5 compression strokes per second.
And in evidence of their ambiguity, I submit the very next question. Here they differentiate between a stroke and a revolution. They screwed up their own premise.
4) When a piston reaches its highest point in the cylinder, this is called what? Conversely, what is the lowest point in a piston's travel called?
The highest point of travel by the
piston is called top dead center (TDC), and the lowest point of travel is called bottom
dead center (BDC). There are 180* of travel between TDC and BDC, or one stroke.
The highest point of travel by the
piston is called top dead center (TDC), and the lowest point of travel is called bottom
dead center (BDC). There are 180* of travel between TDC and BDC, or one stroke.
Logistics Pro
Joined: Feb 2011
Posts: 4,841
Likes: 9
From: Stagecoach, NV.
Hi all!
Hope everyone had a fun & safe 4th!
I had a rough night lastnight. Disrespectful preteen pretty much ruined the day. My 12y/o son stayed the night at a friends & stayed up all night watching TV, only to come home & expect to go to sleep - NOT! He did it to himself & we had things to do, so he had to stay awake & deal with it. (all the while complaining & making our lives hell cause we wouldn't let him sleep until about 1pm)We went to a BBQ at our neighbors around 4:30 & I left hubby & the kids there & walked home (2 blocks) at 8 & went to bed around 9pm. They came home shortly after 9. We didn't even watch the fireworks!
Hope everyone had a fun & safe 4th!
I had a rough night lastnight. Disrespectful preteen pretty much ruined the day. My 12y/o son stayed the night at a friends & stayed up all night watching TV, only to come home & expect to go to sleep - NOT! He did it to himself & we had things to do, so he had to stay awake & deal with it. (all the while complaining & making our lives hell cause we wouldn't let him sleep until about 1pm)We went to a BBQ at our neighbors around 4:30 & I left hubby & the kids there & walked home (2 blocks) at 8 & went to bed around 9pm. They came home shortly after 9. We didn't even watch the fireworks!