Electrical
What are the three terms used to describe a transmission that you have to move a lever to shift from one gear to another?
Standard, Manual, Mechanical
Atmospheric pressure at sea level is 14.7
True or False
True
Before work can be done to the equipment what has to happen to prepare the equipment for servicing?
Park on level ground,
Chock block both sides of vehicle.
Who pioneered the modern driveshaft and U-joint?
Clarence Spicer
What is an amp?
A certain amount of electrons passing through a point in the circuit.
A hydraulic ________ is a linear actuator in which hydraulic force is converted into mechanical energy.
Ram
What is AC/DC refer to?
Type of electricity being used.
Why should you make sure the equipment is on level ground when breaking track?
Because it can roll away from you if you don’t.
What is the part called that the brake shoes push against to change motion energy to heat energy?
Brake drum
What is the main function of a transfer case?
To distribute torque from the transmission to the live front and rear axle.
What is amber and fir?
Items used to discover electricity
About how many rpms need to drop when shifting?
750
What two general types of wheels are used?
Cast spoke wheels, disc wheels.
__________ is the science of transmitting force by pushing on a confined liquid.
Hydrostatics
What is the typical pressure of air reservoirs?
120 PSI
The chassis frame is referred to as what?
Backbone of all heavy-duty vehicles
estrictions in a hydraulic system can be intentional, such as a restricted orifice. Restrictions in a hydraulic system can also be unintentional, such as a collapsed hydraulic line.
These statements are correct.
What are the planetary gearset components?
Carrier with planetary pinion gears, Ring gear or annulus, Sun gear
If I have 3 ohms of resistance on each leg of a parallel circuit, what is the total resistance in the circuit?
1.5 ohms
Parking/emergency brake’s function is performed how?
Mechanically applied powerful springs.
Using Pascals Law, if you apply 1000 psi to a 5 inch square surface how much force would you generate?
5000 lbs
Which electrical voltage value does a DMM output when in diode test mode?
0.6V
What is tandem sliding suspension?
Ability to slide the bogie forward and backwards.
What are the cooling line of the compressor system made of?
Copper and steel braided
What determines the actual pressure in the governor circuit?
The position of the governor valve.
Most current heavy-duty, diesel engine cylinder blocks are manufactured from:
compacted graphite iron (CGI).
If a radiator cap pressure valve fails to seal, which of the following would be the likely outcome?
Coolant boil-off
Technician A states that DPFs can run up to 8 hours in a linehaul diesel engine before regeneration. Technician B states that some DPFs must be removed from the vehicle for cleaning on a weekly basis. Who is correct?
Technician A only
Technician A states that #2D diesel fuel will, in most cases, produce slightly better fuel mileage from a highway truck engine than a #1D fuel. Technician B states that #2D usually has more heat energy than a #1D fuel. Who is correct?
Both A and B
Technician A states that the cam geometry used on a Bosch sleeve-metering rotary distributor pump is specific to the engine that it fuels. Referring to the same pump, Technician B states that the cam ring rotates at engine camshaft speed. Who is correct?
Both A and B