Week #1 - Introduction & Safety Flashcards
Which of the following is true of an APCS?
a. The APCS helps the cooling system function with higher heat loads.
b. Coolant boil temperature is raised.
c. Cooling system pressure is raised by compressed air.
d. All of the above
a. The APCS helps the cooling system function with higher heat loads
Convert a torque value of 25 lb-ft. into Newton -meters.
33.9
Which of the following is usually the preferred OEM method of testing an oil cooler bundle?
a. Vacuum test
b. Die penetrant test
c. Pressure test using shop air and a bucket of water
a. Vacuum test
When an ECM controls fan cycles, the fan is driven at lower speeds than an equivalent on-off fan management system.
True
What are the U.S. inventors Eckert and Mauchly known for?
The first electronic digital computer
In a typical diesel-powered highway truck at operating temperature, which of the following should be true?
a. Coolant temperatures should be equal to lube oil temperatures.
b. Coolant temperatures run warmer than lube oil temperatures.
c. Coolant temperatures run cooler than lube oil temperatures.
d. Coolant temperatures run cooler than lube oil temperatures.
When interpreting a used engine oil analysis profile, which of the following conditions would be most likely to cause high silicon levels?
a. Plugged air cleaner
b. Oil cooler bundle disintegration
c. Air cleaner perforation
d. Turbocharger bearing failure
c. Air cleaner perforation
True or False: 15W-40 is the most commonly used truck engine oil.
True
An oil pressure sensor usually requires a V-Ref source from the engine ECM.
True
The tendency of an object in motion to stay in motion is known as what?
Inertia
When using a dial indicator to check the concentricity of a flywheel housing, during a single rotation of the flywheel the reading on the positive side of the zero on the dial peaks at 0.003 while the reading on the negative side peaks at 0.006. What is the TIR?
0.009”
To which of the following values would 1.5 mm be closest?
a. 1.50”
b. 0.250”
c. 0.125”
d. 0.0625”
d. 0.625”
If a radiator cap pressure valve fails to seal, which of the following would be the likely outcome?
a. Cavitated cylinder liners
b. Cooler operating temperatures
c. Coolant boil-off
d. Higher HC emissions
c. Coolant boil-off
Wet liner cavitation is cause by:
a. air in the radiator
b. vapor bubble collapse
c. aerated coolant
d. combustion gas
b. Vapor bubble collapse
Who patented the first high-pressure liquid fuel injection pump for a diesel engine?
Bosch
What is used to identify an SAE grade 8 bolt?
5 radial strokes on the capscrew head
A full flow oil filter has become completely plugged. What is the likely outcome if the engine is running?
a. The engine seizes
b. The oil pump hydraulically locks
c. A bypass valve diverts the oil around the filter
d. Engine lubrication ceases
c. A bypass valve diverts the oil around the filter
Which of the following API classifications indicates that the oil is formulated for diesel engines meeting MY 2010 emissions standards up to 2017?
a. CI-4
b. CJ-4
c. CC
d. GF
b. CJ-4
True or False: An oil cooler operates by having coolant pumped through the bundle tubes and oil circulated around the tubes.
True
When the thermostat routes the coolant through the bypass circuit, what is happening?
a. The coolant is cycled primarily through the engine.
b. The coolant is cycled primarily through auxiliary heat exchangers.
c. The coolant is cycled primarily through the radiator.
a. The coolant is cycled primarily through the engine.
Where does scavenging take place in a four stroke cycle diesel engine?
a. Valve overlap
b. BDC after the power stroke
c. 10 to 20 degrees ATDC on the power stroke
d. TDC after the compression stroke
a. Valve overlap
Which of the following properly describes the operating principle of a typical coolant pump on a highway diesel engine?
a. Centrifugal
b. Positive displacement
c. Gear type
d. Constant volume
a. Centrifugal
What grade of eye protection filter would be recommended when performing oxyacetylene cutting?
5
Which of the following is required to produce peak torque in a diesel engine? a,. Peak mechanical efficiency b. Peak volumetric efficiency c. Peak brake power d. Peak cylinder pressure
d. Peak cylinder pressure