Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Chapter 20, Problem 3ASRQ
Composite headlights are being discussed: Technician A says that they have replaceable bulbs. Technician B says that a cracked or broken lens will prevent the operation of a composite headlamp. 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 20 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 20 - What lighting systems are controlled by the...Ch. 20 - What is a CHMSL?Ch. 20 - True or False? HID lamps produce more heat and...Ch. 20 - True or False? The headlights on many adaptive...Ch. 20 - True or False? All turn signal flasher units...Ch. 20 - Which of the following may cause the turn signal...Ch. 20 - What are the most probable causes for one low-beam...Ch. 20 - How many wires are normally connected to a double...Ch. 20 - Circuits that can energize the high beams even if...Ch. 20 - Why do some manufacturers protect the headlamp...
Ch. 20 - What types of headlights do not have a filament?Ch. 20 - What is the primary tool used to diagnose an auto...Ch. 20 - Which of the following would probably not cause...Ch. 20 - The stoplight switch is normally mounted on the...Ch. 20 - Which of the following is not a true statement...Ch. 20 - While troubleshooting a headlight problem:...Ch. 20 - Technician A says that the condition of the...Ch. 20 - Composite headlights are being discussed:...Ch. 20 - While troubleshooting a brake light problem;...Ch. 20 - Technician A says that a sealed-beam headlight...Ch. 20 - While diagnosing an HID lamp that does not turn...Ch. 20 - Technician A says that flickering vehicle lights...Ch. 20 - The turn signals operate in the left direction...Ch. 20 - The right back-up lamp is dim: Technician A says...Ch. 20 - When the headlights are switched from low beam to...
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- 123 12) The spring has a stiffness k = 200 N/m and an unstretched length of 0.5 m. If it is attached to the 3-kg smooth collar and the collar is released from rest at A, determine the speed of the collar when it reaches B. Neglect the size of the collar. 2 m S Z k=200 N/m B 1.5 marrow_forward11) The assembly consists of two blocks A and B which have a mass of 20 kg and 30 kg, respectively. Determine the speed of each block when B descends 1.5 m. The blocks are released from rest. Neglect the mass of the pulleys and cords. Barrow_forward8) The 1000-lb elevator is hoisted by the pulley system and motor M. If the motor exerts a constant force of 500 lb on the cable, determine the power that must be supplied to the motor at the instant the load has been hoisted s = 15 ft starting from rest. The motor has an efficiency of ε = 0.65. 0000arrow_forward
- 7) The spring has a stiffness k = 50 lb/ft and an unstretched length of 2 ft. As shown, it is confined by the plate and wall using cables so that its length is 1.5 ft. A 4-lb block is given a speed VA when it is at A, and it slides down the incline having a coefficient of kinetic friction μk = 0.2. If it strikes the plate and pushes it forward 0.25 ft before stopping, determine its speed at A. Neglect the mass of the plate and spring. Α k = 50 lb/ft 1.5 ft 3ftarrow_forward10) The 30-lb block A is placed on top of two nested springs B and C and then pushed down to the position shown. If it is then released, determine the maximum height h to which it will rise. 6 in. 4 in. kg 200 lb/in. kc 100 lb/in. Barrow_forwardAs indicated by the derivation, the principle of work and energy is valid for observers in any inertial reference frame. Show that this is so, by considering the 10-kg block which rests on the smooth surface and is subjected to a horizontal force of 6 N. If observer A is in a fixed frame x, determine the final speed of the block if it has an initial speed of 5 m/s and travels 10 m, both directed to the right and measured from the fixed frame. Compare the result with that obtained by an observer B, attached to the x' axis and moving at a constant velocity of 2 m/s relative to A. Hint: The distance the block travels will first have to be computed for observer B before applying the principle of work and energy. A B 2 m/s 5 m/s 6 N 10 marrow_forward
- 6) The block has a mass of 0.8 kg and moves within the smooth vertical slot. If it starts from rest when the attached spring is in the unstretched position at A, determine the constant vertical force F which must be applied to the cord so that the block attains a speed vB = 2.5 m/s when it reaches B; SB = 0.15 m. Neglect the size and mass of the pulley. Hint: The work of F can be determined by finding the difference Al in cord lengths AC and BC and using UF = F Al. 0.4 m -0.3 m- wwwwww k = 100 N/marrow_forwardIf the cord is subjected to a constant force of F = 300 N and the 15-kg smooth collar starts from rest at A, determine the velocity of the collar when it reaches point B. Neglect the size of the pulley. 200 mm- 200 mm B 300 mm 30° 200 mm F= 300 Narrow_forward5) The 25-lb block has an initial speed of v = 10 ft/s when it is midway between springs A and B. After striking spring B, it rebounds and slides across the horizontal plane toward spring A, etc. If the coefficient of kinetic friction between the plane and the block is μk 0.4, determine the total distance traveled by the block before it comes to rest. k₁ = 10 lb/in. 2 ft 1 ft = 10 ft/s kB = 60 lb/in. Barrow_forward
- 9) The sports car has a mass of 2.3 Mg, and while it is traveling at 28 m/s the driver causes it to accelerate at 5 m/s². If the drag resistance on the car due to the wind is FD = (0.3v²) N, where v is the velocity in m/s, determine the power supplied to the engine at this instant. The engine has a running efficiency of € = 0.68. 1=arrow_forward1) 1000 N 800 N The crate, which has a mass of 100 kg, is subjected to the action of the two forces. If it is originally at rest, determine the distance it slides in order to attain a speed of 6 m/s. The coefficient of kinetic friction between the crate and the surface is μk = 0.2. 30°arrow_forwardThe light right-angle boom which supports the 250-kg cylinder is supported by three cables and a ball-and-socket joint at O attached to the vertical x-y surface. Determine the reactions at O and the cable tensions. A Answers: C y +1.40 m! 0.70 m B 0.70 m 250 kg 1.40 m. D 1.15 m E 1.15 m 2.95 m Ox N, Oy = i N, O₂ = i TAC = i N, TBD = N, TBE = i N Narrow_forward
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