
Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 14, Problem 9ASRQ
While discussing the causes of extreme engine bearing damage Technician A says that contaminated and old engine oil could be the cause. Technician B says that a leaking radiator could be the cause. Who is correct?
- Technician A
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4.75 An air-conditioning system is shown in Fig. P4.75 in which
air flows over tubes carrying Refrigerant 134a. Air enters
with a volumetric flow rate of 50 m³/min at 32°C, 1 bar, and
exits at 22°C, 0.95 bar. Refrigerant enters the tubes at 5 bar
with a quality of 20% and exits at 5 bar, 20°C. Ignoring heat
transfer at the outer surface of the air conditioner, and
neglecting kinetic and potential energy effects, determine at
steady state
(a) the mass flow rate of the refrigerant, in kg/min.
(b) the rate of heat transfer, in kJ/min, between the air and
refrigerant.
3
R-134a
P3 = 5 bar
x3 = 0.20
Refrigerant 134
Air
P₁ = 1 bar
T₁ =32°C 305 K
(AV), 50 m³/min
=
Air
2-P2 = 0.95 bar
T2 22°C 295 K
=
=
4
R-134a
P4 = 5 bar
T4=20°C
4.42 Steam enters a well-insulated turbine operating at steady
state at 4 MPa with a specific enthalpy of 3015.4 kJ/kg and a
velocity of 10 m/s. The steam expands to the turbine exit where
the pressure is 0.07 MPa, specific enthalpy is 2431.7 kJ/kg,
and the velocity is 90 m/s. The mass flow rate is 11.95 kg/s.
Neglecting potential energy effects, determine the power
developed by the turbine, in kW.
The two blocks A and B have weights WA = 60 lb and
WB = 10 lb. If the kinetic coefficient of friction between the
incline and block A is μk = 0.2, determine the speed of A
after it moves 3 ft down the plane starting from rest. Neglect
the mass of the cord and pulleys.
3
B
Chapter 14 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 14 - What is the most efficient way to increase a...Ch. 14 - True or False? Oil pressure is determined by...Ch. 14 - Describe the simple test used to determine whether...Ch. 14 - Which of the following is a function of the...Ch. 14 - What is ECD and what can result from it?Ch. 14 - True or False? To eliminate the drain of engine...Ch. 14 - For every pound of pressure put on engine coolant,...Ch. 14 - Which is not a typical method of driving the water...Ch. 14 - Which of the following is not an effective way to...Ch. 14 - Explain why a pressure relief valve is needed in...
Ch. 14 - List five problems that can be caused by engine...Ch. 14 - Cooling system hoses should be replaced when they...Ch. 14 - True or False? The presence of air in the cooling...Ch. 14 - Which of the following is not a true statement...Ch. 14 - Describe the procedure for using air bleed valves...Ch. 14 - Technician A uses a feeler gauge and straightedge...Ch. 14 - Technician A says that excessive engine oil...Ch. 14 - While checking for conditions that might cause...Ch. 14 - When installing an oil pump in an engine...Ch. 14 - Technician A says that if the PCV valve or...Ch. 14 - While bleeding air from a cooling system:...Ch. 14 - While diagnosing an engine that overheats after...Ch. 14 - While performing a cooling system service on a...Ch. 14 - While discussing the causes of extreme engine...Ch. 14 - While diagnosing the cause of air bubbles in the...
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