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 11, Problem 10ASRQ
Technician A says that crankshaft counterweights offset the weight of the connecting rods and pistons. Technician B says that crankshaft counterweights are used to dampen crankshaft torsional vibrations. Who is correct?
- Technician A
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A pressurized tank of water has a 10-cm-diameter orifice at the bottom, where water discharges to the atmosphere. The water level is
2.5 m above the outlet. The tank air pressure above the water level is 250 kPa (absolute), while the atmospheric pressure is 100 kPa.
Neglecting frictional effects, determine the initial discharge rate of water from the tank. (Round the final answer to three decimal
places.)
-Air
250 kPa
dcm
2.5 m
The initial discharge rate of water from the tank is determined to be 18.683
m³/s.
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A 3-m-high large tank is initially filled with water. The tank water surface is open to the atmosphere, and a sharp-edged 10-cm-diameter
orifice at the bottom drains to the atmosphere through a horizontal 80-m-long pipe. The total irreversible head loss of the system is
determined to be 1.500 m. In order to drain the tank faster, a pump is installed near the tank exit. Determine the pump head input
necessary to establish an average water speed of 6.5 m/s when the tank is full. Disregard the effect of the kinetic energy correction
factors. (Round the final answer to three decimal places.)
Water
3 m
10 cm
80 m
The required useful pump head is 1.200 m.
(30 minutes) Consider a converging-diverging nozzle, which is open to stagnant atmosphere
at the inlet and connected to an infinitely large low-pressure reservoir downstream at the
outlet (see the figure below). The ambient pressure (pa) is 1 bar, the throat cross section area
is 0.1 m². Imagine that the pressure in the low-pressure reservoir (p₁) can be changed to
regulate the flow in the nozzle.
Me
Pa=1 bar
A₁ =0.1 m²
Ae
Pv
Pe
Low pressure reservoir
a) It is known that when p₁
=
0.8 bar, the nozzle is choked and the flow in the converging-
diverging nozzle is subsonic. Find the exit cross-section area (Ae), the static pressure at
the exit (pe) and the Mach number at the exit (Me) for this case.
b) Determine the range of vacuum pressure (pv) for which there is a normal shock wave in
the diverging section of the nozzle.
c) Imagine that a pitot-tube is inserted at the exit of the nozzle. What would be the total
pressure reading when: (1) p₁ = 0.8 bar; (2) p, is adjusted such that the…
Chapter 11 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 11 - Explain how to use a micrometer to measure cam...Ch. 11 - What is the cylinder taper?Ch. 11 - Describe how to measure main bearing oil...Ch. 11 - Where does maximum cylinder bore wear occur and...Ch. 11 - What type of valve lifter automatically...Ch. 11 - List three types of compression rings.Ch. 11 - Most pistons used today are made of. cast iron...Ch. 11 - Cam bearings in OHV engines are typically which...Ch. 11 - Which of the following is not of concern when...Ch. 11 - True or False? Cylinder taper is the difference in...
Ch. 11 - What is the purpose of a thrust main bearing?Ch. 11 - Each halt' of a split bearing is made slightly...Ch. 11 - Prob. 13RQCh. 11 - Prob. 14RQCh. 11 - Which type of oil ring is slotted so that excess...Ch. 11 - When removing the balance shaft assembly:...Ch. 11 - After installing cam bearings: Technician A checks...Ch. 11 - Technician A says that a cylinder wall with too...Ch. 11 - Technician A uses a pry bar to stretch the timing...Ch. 11 - Technician A installs a cup-type core plug with...Ch. 11 - Technician A uses a micrometer to measure the...Ch. 11 - Technician A says that piston ring end gaps should...Ch. 11 - Technician A checks crankshaft oil clearance with...Ch. 11 - When removing the piston and rod assemblies from a...Ch. 11 - Technician A says that crankshaft counterweights...
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