Automotive Technology: Principles, Diagnosis, and Service Plus MyLab Automotive with Pearson eText -- Access Card Package (5th Edition) (Automotive Comprehensive Books)
5th Edition
ISBN: 9780134009087
Author: James D. Halderman
Publisher: PEARSON
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Textbook Question
Chapter 21, Problem 7CQ
Which statement is true about thermostats?
- a. The temperature marked on the thermostat is the temperature at which the thermostat should be fully open.
- b. Thermostats control the flow of coolant to the heater.
- c. The temperature marked on the thermostat is the temperature at which the thermostat should start to open.
- d. Both a and b.
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You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (p = 0.001 kg m-1 s-1) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
y = +h
I
2h = 1 cm
x1
y = -h
u(y)
1 dP
2μ dx
-y² + Ay + B
moving plate
stationary plate
U
2
I2
L = 10 cm
Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
Question 1
You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (µ = 0.001 kg m¯¹ s¯¹) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
1 dP
u(y)
=
2μ dx
-y² + Ay + B
y= +h
Ꮖ
2h=1 cm
1
x1
y = −h
moving plate
stationary plate
2
X2
L = 10 cm
Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
(a) By considering the appropriate boundary conditions, show that the constants take
the following forms:
U
U
1 dP
A =…
Question 2
You are an engineer working in the propulsion team for a supersonic civil transport
aircraft driven by a turbojet engine, where you have oversight of the design for the
engine intake and the exhaust nozzle, indicated in Figure Q2a. The turbojet engine can
operate when provided with air flow in the Mach number range, 0.60 to 0.80. You are
asked to analyse a condition where the aircraft is flying at 472 m/s at an altitude of
14,000 m. For all parts of the question, you can assume that the flow path of air through
the engine has a circular cross section.
(a)
← intake
normal
shock
472 m/s
A B
(b)
50 m/s
H
472 m/s
B
engine
altitude: 14,000 m
exhaust nozzle
E
F
exit to
atmosphere
diameter: DE = 0.30 m
E
F
diameter: DF = 0.66 m
Figure Q2: Propulsion system for a supersonic aircraft.
a) When the aircraft is at an altitude of 14,000 m, use the International Standard
Atmosphere in the Module Data Book to state the local air pressure and tempera-
ture. Thus show that the aircraft speed…
Chapter 21 Solutions
Automotive Technology: Principles, Diagnosis, and Service Plus MyLab Automotive with Pearson eText -- Access Card Package (5th Edition) (Automotive Comprehensive Books)
Ch. 21 - What is normal operating coolant temperature?Ch. 21 - Explain the flow of coolant through the engine and...Ch. 21 - Why is a cooling system pressurized?Ch. 21 - Prob. 4RQCh. 21 - Prob. 5RQCh. 21 - Prob. 6RQCh. 21 - Describe how to diagnose a heater problem.Ch. 21 - What are 10 common causes of overheating?Ch. 21 - Prob. 1CQCh. 21 - A customer complains that the heater works...
Ch. 21 - Prob. 3CQCh. 21 - Prob. 4CQCh. 21 - Water pumps __________. a. only work at idle and...Ch. 21 - What diagnostic trouble code (DTC) could be set if...Ch. 21 - Which statement is true about thermostats? a. The...Ch. 21 - Prob. 8CQCh. 21 - Technician A says that dirty or blocked radiator...Ch. 21 - The normal operating temperature (coolant...
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