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Fourth Year Millwright 2018 > Stationary Engines Fundamentals > Flashcards

Stationary Engines Fundamentals Flashcards

1
Q

What is an Engine?

A

A mechanical device that converts, fuel chemical energy, and then converting it in to mechanical energy.

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2
Q

The rate at which work is being done?

A

Power

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3
Q

What does a Vacuum gauge reads at atmospheric pressure?

A

29.92 inches mercury

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4
Q

What should be done before working on a large engine?

A
  • Lock-out barring device
  • Pin It
  • Lock and tag Out Flywheel
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5
Q

The volume remaining above the piston when it’s at TDC is called?

A

Clearance Volume

(CV)

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6
Q

The action of one body to another, tending to change the state of motion of the body acted upon, is?

A

Force

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7
Q

the twisting force acting at a radius that produces a turning moment is?

A

Torque

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8
Q

The rate at which work is being done?

A

Power

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9
Q

The power required to overcome engine frictional and pumping loses?

A

Friction Horse

(FHP)

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10
Q

What is the theoretical power of an engine?

A

Indicated Horsepower

(IHP)

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11
Q

The actual power measured at the end of the crankshaft?

A

Brake Horsepower

(BHP)

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12
Q

The resistance to motion between two surfaces?

A

Friction

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13
Q

The tendency of an object in motion to stay in motion?

A

Inertia

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14
Q

The pressure that is below atmospheric pressure?

A

Vacuum

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15
Q

The movement of the piston from (TDC to BDC) Top Dead Centre to Bottom Dead Centre?

A

Stroke

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16
Q

What is the inside of a round cylinder or hole?

A

Bore

17
Q

An engine that has the same dimensions for bore diameter and stroke length is known as?

A

Square Engine

18
Q

An engine that has a larger bore diameter than the stroke length?

A

Oversquare Engine

19
Q

An Engine that has a larger stroke than the bore diameter is?

A

Undersquare Engine

20
Q

Which type of engine has a higher piston speed?

A

Undersquare Engine

21
Q

The volume swept by all pistons in the is?

A

The Engine Displacement

22
Q

The ratio of the total volume of the cylinder (displacement) and the combustion chamber (clearance volume) when the piston is at BDC to the clearance volume when the piston is at TDC?

A

Compression Ratio

23
Q

Compression ratio formula?

A

CR= (Displacement + Clearance) / Clearance Volume

24
Q

The ratio expressed as a percent, of the volume of atmospheric air drawn into the cylinder on the intake stroke to the cylinder displacement?

A

Volumetric Efficiency

25
Q

Volumetric efficiency usually applies to?

A

Four Stroke Engine

26
Q

Most Engines have a thermal efficiency of?

A

25% to 35% Efficiency

Note: School says is 25% to 45% LOL

Fourth Year Millwright 2018 (15 decks)

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