EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Chapter 10, Problem 5RQ
What is the most common output current for flow sensors?
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A prototype automobile is designed to travel at 65 km/hr. A model of this design is tested in a wind tunnel with identical standard sea-
level air properties at a 1:5 scale. The measured model drag is 529 N, enforcing dynamic similarity. Determine (a) the drag force on the
prototype and (b) the power required to overcome this drag. See the equation
Vm
m
=
D
V Dm
(a) Dp = i
(b) Pp = i
N
hp
A new blimp will move at 6 m/s in 20°C air, and we want to predict the drag force. Using a 1: 14-scale model in water at 20°C and
measuring a 2500-N drag force on the model, determine (a) the required water velocity, (b) the drag on the prototype blimp and, (c) the
power that will be required to propel it through the air.
(a) Vm = i
(b) Dp = i
(c) Pp = i
m/s
N
W
Drag measurements were taken for a sphere, with a diameter of 5 cm, moving at 3.7 m/s in water at 20°C. The resulting drag on the
sphere was 10 N. For a balloon with 1-m diameter rising in air with standard temperature and pressure, determine (a) the velocity if
Reynolds number similarity is enforced and (b) the drag force if the drag coefficient in the equation below is the dependent pi term.
li ε pVI
D
1
= CD = Q
μ
(a) Vp = i
(b) Dp = i
m/s
N
Chapter 10 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
Ch. 10 - What are typical uses of flow switches?
Ch. 10 - Draw a line diagram to show a green light that...Ch. 10 - Draw a one-line diagram showing a bell that rings...Ch. 10 - What is a transducer?
Ch. 10 - What is the most common output current for flow...Ch. 10 - What is Faradays Law concerning conductors moving...Ch. 10 - What type of flow sensors use Faradays Law as...Ch. 10 - What is the operating principle of the solid-state...Ch. 10 - Refer to the circuit shown in Figure 10-6. When...Ch. 10 - Refer to the circuit shown in Figure 10-6. When...
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