Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 3, Problem 1SQ
To determine
Explain about a magnetic line voltage motor starter.
Expert Solution & Answer
Explanation of Solution
Discussion:
Magnetic line voltage motor starters are electromechanical devices that provide a safe, convenient, and economical means of full voltage starting and stopping motors. Magnetic line voltage starters use electromechanical energy to close the switches.
Magnetic line voltage motor starters use along with overload relays and protect the motor from over loads (over currents due to high voltage).
Magnetic line voltage motor starters can be controlled remotely with push buttons, float switches, timing relays, and other pilot devices.
Conclusion:
Thus, the magnetic line voltage motor starter is explained.
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1) (5 pts) Note have to use nodal analysis at Vp and Vn.
a) Determine Vout in the following ideal op-amp circuit. The power supplies supplying
power to the op-amp have voltage values of ±15 volts (Vcc = +15 Volts, -VCC = -15Volts)
b) Determine the value of RĘ that makes Vo, -15 Volts.
c) What value of RF makes Vo = 0 Volts?
out
F
out
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2V
1V
25K
10K
2V
1V
30K
100K
RF
12K
12K
+
E
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out
E
2) (5 pts) Find Vout in the following circuit. Perform nodal analysis at nodes VN, VP and Va
20K
Va
20K
10K
10K
1 V
2 V
5K
Vout
15K
Note: There is no restriction on the value
for Vout for this problem.
3) (5 pts) For the Thevenin equivalent circuit shown, answer the following questions:
250 Ohms a
200 V
°
b
a) What load resistor results in maximum power delivered to that resistor?
b) What is the maximum power delivered to the resistor in…
A 30 kVA, single-phase transformer is rated 240/120 volts is connected as a 120 / 360 volt autotransformer. Determine the rating of the auotransformer.
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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