Which of the statements about brake systems used on heavy-duty trucks is NOT true?
A. Class 8 trucks use air brake systems
B. Current production trucks and trailers are equipped with ABS
C. Disc brakes are not used on heavy duty trucks
D. Some class 7 trucks have air-over-hydraulic brakes
Answer: C
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Air at 450 kPa and 20°C fills a piston-cylinder assembly to a volume of 0.075 m3. The air expands, in a constant-temperature process, until the pressure is 150 kPa. (The constant-temperature process with a gas can be modeled as a polytropic process with n=1.) Determine the work done by the air as it expands.
Given: P1 = 450 kPa; V1 = 0.075 m3; P2 = 150 kPa What will be an ideal response?
A(n) ____ is a component of the work that can be considered separately from the other parts of the work.
A. assembly B. drawing C. subunit D. zone
A VLAN refers to a connection path between a SONET interface port and an ISDN terminal
Indicate whether the statement is true or false
If, while troubleshooting a residential central air conditioning system, the technician notices frost on the suction line, what is the most likely problem?
A. dirty air filter B. defective condenser fan motor C. dirty condenser D. high superheat E. normal operation