Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 21, Problem 4SQ
How is auxiliary contact interlocking achieved on a reversing starter?
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How to avoid the effect of the high current at starting of the Motor?
a.
variable resistor is connected in series with Armature circuit
b.
variable resistor is connected in parallel with Armature circuit
c.
variable resistor is connected in series with field circuit
d.
None of the above
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A selector switch Andrés two- aire piloto debiese cannot be used to comtrol a larger motor directly but rather must be connected to the magnetic starter. Why this is true?
What safely feature does the conbination starter provide that individual motor starting assemblies do not?
Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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- Why there is need of starter in the 3-phase induction motor?arrow_forwardA three phase star connected six pole induction motor has parameter R1=0.294,R2=0.144,X1=0.209,X2=13.25,SLIP OF THE motor is 2% find stator of input impedencearrow_forward1. Explain the working Principle of Single Phase Induction Motor. 2. What are the different types of Starters to control AC-Motor. Explain briefly. 3. Explain DOL starter of Single Phase Induction Motor briefly. 4. What is the purpose of the magnetic contactor? 5. What is the use of auxiliary contact in the magnetic controller? 6. What happens when the holding coil gets the supply in the magnetic controller? 7. Explain the working principle of a relay.arrow_forward
- (B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forwardDescribe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forwardWhen the high button is depressed in Figure 314, what prevents the high-speed starter from closing immediately?arrow_forward
- 5. Which part (s) of the DC motor connect the power supply to the split- ring and coil? * O a) Carbon brushes O b) Magnets O c) Commutator d) Slip ringsarrow_forwarda three phase star connected six pole induction motor has the following parameters R1=0.294 ohm,R2=0.144ohm,X1=0.503ohm,X2=0.209ohm Xm=13.25ohm a slip of the motor is 2%. the stator input impedence of the motor is?arrow_forwardExplain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistancearrow_forward
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