Stationary Engine Fundamentals Module

Question 1

True or False;
The engine flywheel should be pinned and locked out before entering the crankcase?

Answer 1

True

Question 2

Before performing maintenance on a recently run engine, what must you do?

Answer 2

Disconnect any electrical feed and close, lock, tag and purge all gas sources

Question 3

True or False;
When working in areas of high concentrations of hydrogen sulphide(h2s), you should always wear a personal alarm monitor?

Answer 3

true

Question 4

The thermal efficiency of an engine is best described as the ability of the engine to;

Answer 4

Change the energy in the fuel to usable heat energy and power

Question 5

The amount of air an engine can take into the cylinder compared with the volume of the cylinder is called ______________.

Answer 5

Volumetric efficiency

Question 6

The description of compression ratio is best stated as;

Answer 6

The cylinder volume plus the combustion chamber volume, divided by the combustion chamber volume.

Question 7

On a 2-stroke engine with 6 cylinders and a firing order of 1-5-3-6-2-4, the running mates would be?

Answer 7

There would be no running mates as it applies to 4-strokes only.

Question 8

The displacement of a 6 cylinder engine with a 5 inch bore and 6 inch stroke is;

Answer 8

Engine displacement = area of bore x length of stroke x # of cylinders
bore: 5/2 = 2.5²
stroke = 6
# of cylinders = 6
= π x 2.5² x 6 x 6
=706.85in3

Question 9

When comparing a Diesel engine to a gas engine, the:

Answer 9

-compression pressures and compression ratios may be twice as high or greater in a diesel
-diesels are heavier

Question 10

When air is compressed, what are the noticeable effects?

Answer 10

The temperature increases, as the volume becomes smaller

Question 11

The SI metric system measures pressure in?

Answer 11

Pascals
Pressure (P) = Force (F) / Area (A)

Question 12

When you are determining engine rotation using the SAE standard, you view the engine from:

Answer 12

The main power end of the engine.

Question 13

What type of head design has the valves in the block?

Answer 13

L head engine (flat head)

Question 14

True or False;
Indicated horsepower is the power at the flywheel of the engine.

Answer 14

False - indicated HP is theoretical power of an engine

Question 15

True or False;
A two-stroke engine completes one cycle in 720 degree rotation

Answer 15

False
360 = 2 stroke
720 = 4 stroke

Question 16

True or False;
Potential energy is the energy resulting from the motion of an object.

Answer 16

False
Kinetic energy is energy resulting from the motion of an object

Question 17

True or False;
An under square engine is an engine with a larger stroke than bore.

Answer 17

True

Question 18

True or False;
Blow-by is leakage past the rings

Answer 18

True

Question 19

True or False;
Running mates are pistons that reach TDC at the same time.

Answer 19

True

Question 20

True or False;
The basic requirements for combustion are air, spark and compression.

Answer 20

False - fuel, air, ignition

Question 21

True or False;
The fuel must be atomized and mixed with air to be burned.

Answer 21

True

Question 22

True or False;
At the end of the exhaust stroke, the intake and exhaust valves are open at the same time.

Answer 22

True

Question 23

True or False;
A 2 stroke engine makes twice as much power as a four stroke engine of the same capacity.

Answer 23

False - does not, because the effective power stroke is shorter than a 4 stroke.

Question 24

True or False;
Spark-ignition engines have a much lower compression ratio than Diesel engines.

Answer 24

True

Question 25

True or False;
The classification for an engine with a normal operating speed of 800 rpm is a low-speed engine.

Answer 25

False - Medium speed

Low speed - under 500rpm
Medium 500-1000rpm
High - over 1000rpm

Question 26

True or False;
Integral engines require proper alignment with the driven equipment

Answer 26

False - driven equipment is built into engine

Question 27

True or False;
On a horsepower-torque curve, the high point of the torque curve indicates the approximate rpm for maximum volumetric efficiency.

Answer 27

True

Question 28

What causes air to flow into the engine?

Answer 28

The piston creates low pressure when moving downward.