Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 24, Problem 1RQ
Are numbering systems other than the one described in this text used to develop wiring diagrams from schematic diagrams?
Expert Solution & Answer
To determine
Whether the number system other than the one that are described in the text are used to determine the wiring diagrams from the schematic diagram.
Explanation of Solution
Consider the figure 24-1 in the text book for the schematic of the numbered components, consider Figure 24-2 in the text book for the schematic that has the component of the wiring diagram and is labelled by the numbers and correspond to the number component.
Then, consider the Figure 24-3 for the wiring diagram for the connected wires.
Thus, this method to number a schematic is used by a professional in electric troubleshooting.
There are many other way to number the systems other than one that is described in the textbook but every method has the same principle.
This shows that the number system is used to determine the wiring diagrams from the schematic diagrams.
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Students have asked these similar questions
As shown in the figure below, moist air at T₁ = 36°C, 1 bar, and 35% relative humidity enters a heat exchanger operating at steady state
with a volumetric flow rate of 10 m³/min and is cooled at constant pressure to 22°C. Ignoring kinetic and potential energy effects,
determine:
(a) the dew point temperature at the inlet, in °C.
(b) the mass flow rate of moist air at the exit, in kg/min.
(c) the relative humidity at the exit.
(d) the rate of heat transfer from the moist air stream, in kW.
(AV)1, T1
P₁ = 1 bar
11
= 35%
120
T₂=22°C
P2 = 1 bar
Air at T₁-24°C, p₁-1 bar, 50% relative humidity enters an insulated chamber operating at steady state with a mass flow rate of 3
kg/min and mixes with a saturated moist air stream entering at T₂-7°C, p2-1 bar. A single mixed stream exits at T3-17°C, p3-1 bar.
Neglect kinetic and potential energy effects
Step 1
Your answer is correct.
Determine mass flow rate of the moist air entering at state 2, in kg/min.
m2 = 2.1
Hint
kg/min
Using multiple attempts will impact your score.
5% score reduction after attempt 2
Step 2
Determine the relative humidity of the exiting stream.
Փ3 =
i
%
Attempts: 1 of 3 used
A reservoir at 300 ft elevation has a 6-in.-diameter discharge pipe located 50 ft below the surface. The pipe is 600 ft long and drops in elevation to 150 ft where the flow discharges to the atmosphere. The pipe is made of riveted steel with a roughness height of 0.005 ft.
Determine the flow rate without a head loss
Determine the flow rate with the pipe friction head loss.
(hints: Since the velocity is not known for part b and the Reynolds number and friction factor depend on velocity, you will need to iterate to find the solution. A good first guess is the velocity from part (a))
Chapter 24 Solutions
Industrial Motor Control
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