Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 27, Problem 3SQ
Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 27–3.
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Q.35
When overload contacts are connected into a control circuit, are they connected in series with the starter coil or in parallel with the starter coil?
Select one:
A. PARALLEL
B. SERIES
a 10hp single-phase motor is connected to 240 volts. the motor nameplate indicates a NEMA Code B, a full-load running current of 47.5 amperes, and a temperature rise of 40⁰C. what size copper conductors with THWN insulation should be used to connect this motor?
What safely feature does the conbination starter provide that individual motor starting assemblies do not?
Chapter 27 Solutions
Electric Motor Control
Ch. 27 - Why is it desirable to remove the autotransformers...Ch. 27 - What is meant by an open transition from start to...Ch. 27 - Which of the following applies to an...Ch. 27 - How are reduced voltages obtained from...Ch. 27 - Prob. 5SQCh. 27 - What is a disadvantage of starting with...Ch. 27 - What is one advantage of using an autotransformer...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A squirrel-cage induction motor has a nameplate full-load current of 78 amperes and a marked temperature rise of 30C. The motor requires a NEMA size 4 starter. Using the overload heater chart in Figure 34-8, what size overload heaters should be used to protect this motor?arrow_forwardINCounter-Current Breaking of a 3-Phase Induction Motor (Reversing the Operation of a 3-Phase Induction Motor). Could you suggest any improvements to the control circuit?arrow_forwardWhen the high button is depressed in Figure 314, what prevents the high-speed starter from closing immediately?arrow_forward
- Draw an schematic control diagram of a reversing starter. Use a standard-duty selector switch with forward, reverse, and stop push buttons with three methods of interlocking.arrow_forwardHow many poles are required on motor starters for the following motors:(a)240-volt, single-phase induction motor,(b)440-volt, three-phase induction motor?arrow_forwardIf an electrical defect occurs in the electronic powersteering(EPS) system, __ .a. the system continues to operate normally, but theEPS warning light is illuminatedb. the system continues to operate with a slightlyreduced power-steering assistc. the EPS control unit shuts the system down byopening the fail-safe and power relaysd. the EPS control unit locks the armature in thesteering gear to prevent armature and screw shaftdamagearrow_forward
- In place of the push buttons in Figure 214, draw a heavy-duty selector switch for forward-reverse-stop control. Show the target table for this selector switch. FIG. 214 Mechanical interlock between the coils prevents the starter from closing all contacts simultaneously. Only one contactor can close at a time.arrow_forwardWhat is the purpose of a starting relay? to start an electric motor to remove the starting winding or component from the circuit to protect the motor from starting overloads to prevent the motor from starting under heavy loadsarrow_forwardWhat type of starter is used to start the three phase Squirrel Cage induction motor? and explain the starter with neat diagram how it is used to start the motor?arrow_forward
- A 460VAC rated, 60 Hz, 125-Hp Three-phase induction type motor is to be connected for across-the-line starting. The nameplate indicates the motor’s maximum ampere rating, 160A. It has a NEMA code letter B. The ambient temp of the installation place is and TW copper will be used. Short-circuit protection device that will be used is Inverse Time Breaker. Calculate the Motor Starter Size.arrow_forward29. The overload relay used to protect each motor - compressor set shall be selected to trip at NOT more than ____ of the motor-compressor rated load current. a. 125% b. 150% c. 140% d. 160%arrow_forwardA starter turns very slowly and has excessive cranking current draw. When removed from the vehicle and bench tested, the starter spins normally and current draw is within specifications. Technician A says poor battery connections may be the cause. Technician B says an internal engine problem may be the cause. Who is correct?arrow_forward
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