EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
7th Edition
ISBN: 9780176919962
Author: Herman
Publisher: VST
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Textbook Question
Chapter 3, Problem 1RQ
A single-phase, 120 volt motor is controlled by a manual motor starter. The motor is not running, and the switch handle on the starter is found to be in the center position. What does this indicate?
Expert Solution & Answer
To determine
The indication of center position of switch handle of a manual motor starter.
Explanation of Solution
Manual motor starter is simple and common motor starter. Operator involvement is must to change the state of a manual motor starter. A manual motor starter is looks like a simple toggle switch. In addition, the manual motor starters are come up with overload protectors. Thus, the manual motor starter has three positions namely ON, OFF, and over load protection.
The two end positons of the toggle lever of a manual motor starter indicates ON and OFF positions. The center position indicates that the motor is tripped due to over load. Whenever the current flows in a circuit, a proportionate heat is generated in a conductor. When a motor is over loaded, more current will flow, heat generation is high. If this continues, the motor will fail. Thus, the overload heater (protector) is involved. The over load protector is designed for normal operating condition. When a motor runs abnormally (over loading), the over load protector stops the power supply to the motor. Thereby, the toggle lever (switch handle) moved to center position.
Hence, the center position of switch handle of a manual motor starter denotes that the motor is tripped due to over load.
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Exercises
Find the solution of the following Differential Equations
1) y" + y = 3x²
3)
"+2y+3y=27x
5) y"+y=6sin(x)
7) y"+4y+4y = 18 cosh(x)
9) (4)-5y"+4y = 10 cos(x)
11) y"+y=x²+x
13) y"-2y+y=e*
15) y+2y"-y'-2y=1-4x³
2) y"+2y' + y = x²
4) "+y=-30 sin(4x)
6) y"+4y+3y=sin(x)+2 cos(x)
8) y"-2y+2y= 2e* cos(x)
10) y+y-2y=3e*
12) y"-y=e*
14) y"+y+y=x+4x³ +12x²
16) y"-2y+2y=2e* cos(x)
The state of stress at a point is σ = -4.00 kpsi, σy = 16.00 kpsi, σ = -14.00 kpsi, Try = 11.00 kpsi,
Tyz = 8.000 kpsi, and T = -14.00 kpsi.
Determine the principal stresses.
The principal normal stress σ₁ is determined to be [
The principal normal stress σ2 is determined to be [
The principal normal stress σ3 is determined to be
kpsi.
kpsi.
The principal shear stress 71/2 is determined to be [
The principal shear stress 7½ is determined to be [
The principal shear stress T₁/, is determined to be [
kpsi.
kpsi.
kpsi.
kpsi.
Repeat Problem 28, except using a shaft that is rotatingand transmitting a torque of 150 N * m from the left bearing to the middle of the shaft. Also, there is a profile keyseat at the middle under the load.
(I want to understand this problem)
Chapter 3 Solutions
EBK 3N3-EBK: INDUSTRIAL MOTOR CONTROL
Ch. 3 - A single-phase, 120 volt motor is controlled by a...Ch. 3 - Prob. 2RQCh. 3 - Prob. 3RQCh. 3 - A push button manual starter has tripped on...Ch. 3 - What is meant by the term line voltage on some...Ch. 3 - Explain the difference between manual motor...Ch. 3 - Prob. 7RQCh. 3 - Prob. 8RQCh. 3 - Refer to the circuit shown in Figure 310. When...Ch. 3 - Prob. 10RQ
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