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 9, Problem 8ASRQ
While determining the most likely problem of an engine with poor compression test results but acceptable cylinder leakage readings: Technician A says that the problem may be incorrect valve timing. Technician B says that the problem is worn valve seats. Who is correct?
- Technician A
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motor supplies 200 kW at 6 Hz to flange A of the shaft shown in Figure. Gear B transfers 125 W of power to operating machinery in the factory, and the remaining power in the shaft is mansferred by gear D. Shafts (1) and (2) are solid aluminum (G = 28 GPa) shafts that have the same diameter and an allowable shear stress of t= 40 MPa. Shaft (3) is a solid steel (G = 80 GPa) shaft with an allowable shear stress of t = 55 MPa. Determine:
a) the minimum permissible diameter for aluminum shafts (1) and (2)
b) the minimum permissible diameter for steel shaft (3).
c) the rotation angle of gear D with respect to flange A if the shafts have the minimum permissible diameters as determined in (a) and (b).
First monthly exam
Gas dynamics
Third stage
Q1/Water at 15° C flow through a 300 mm diameter riveted steel pipe, E-3 mm with a head loss of 6 m in
300 m length. Determine the flow rate in pipe. Use moody chart.
Q2/ Assume a car's exhaust system can be approximated as 14 ft long and 0.125 ft-diameter cast-iron pipe (
= 0.00085 ft) with the equivalent of (6) regular 90° flanged elbows (KL = 0.3) and a muffler. The
muffler acts as a resistor with a loss coefficient of KL= 8.5. Determine the pressure at the beginning of the
exhaust system (pl) if the flowrate is 0.10 cfs, and the exhaust has the same properties as air.(p = 1.74 ×
10-3 slug/ft³, u= 4.7 x 10-7 lb.s/ft²) Use moody chart
(1)
MIDAS
Kel=0.3
Q3/Liquid ammonia at -20°C is flowing through a 30 m long section of a 5 mm diameter copper tube(e =
1.5 × 10-6 m) at a rate of 0.15 kg/s. Determine the pressure drop and the head losses.
.μ= 2.36 × 10-4 kg/m.s)p = 665.1 kg/m³
2/Y
Y+1
2Cp
Q1/ Show that
Cda
Az x
P1
mactual
Cdf
Af
R/T₁
2pf(P1-P2-zxgxpf)
Q2/ A simple jet carburetor has to supply 5 Kg of air per minute. The air is at a pressure of 1.013 bar
and a temperature of 27 °C. Calculate the throat diameter of the choke for air flow velocity of 90 m/sec.
Take velocity coefficient to be 0.8. Assume isentropic flow and the flow to be compressible.
Quiz/ Determine the air-fuel ratio supplied at 5000 m altitude by a carburetor which is adjusted to give
an air-fuel ratio of 14:1 at sea level where air temperature is 27 °C and pressure is 1.013 bar. The
temperature of air decreases with altitude as given by the expression
The air pressure decreases with altitude as per relation h = 19200 log10 (1.013), where P is in bar. State
any assumptions made.
t = ts
P
0.0065h
Chapter 9 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 9 - Prob. 1RQCh. 9 - Describe what takes place during the four strokes...Ch. 9 - As an engines compression ratio increases, what...Ch. 9 - What test can be performed to check the efficiency...Ch. 9 - Describe tappet noise.Ch. 9 - Which of the following statements about engines is...Ch. 9 - Which stroke in the four-stroke cycle begins as...Ch. 9 - True or False? In an HCCI engine, combustion...Ch. 9 - Which of the following is not a true statement...Ch. 9 - True or False? SAE mandates that engine, when...
Ch. 9 - Technician A says head gasket thickness has an...Ch. 9 - Prob. 12RQCh. 9 - The stroke of an engine is the crank throw half...Ch. 9 - True or False? The camshaft is always located in...Ch. 9 - Which of the following is an expression of how...Ch. 9 - While diagnosing the cause for blue smoke from the...Ch. 9 - Prob. 2ASRQCh. 9 - While determining the cause for air leaking out of...Ch. 9 - While diagnosing the cause for an engine having...Ch. 9 - While looking at the results of an oil pressure...Ch. 9 - A vehicle is producing a sharp, metallic rapping...Ch. 9 - While conducting an engine vacuum test; Technician...Ch. 9 - While determining the most likely problem of an...Ch. 9 - When a customer states that black exhaust smoke is...Ch. 9 - Technician A says that if an engine had good...
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