Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 3, Problem 27SQ
Select the best answer for each of the following.
If an operator pushes a start button on a three-phase induction motor and the motor starts to hum, but not run, the probable trouble is
- a. one fuse is blown and the motor is single phasing.
- b. the overload trip needs resetting.
- c. the auxiliary contact is shorted.
- d. one phase is grounded.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
3-1) Similar to Lathi & Ding prob. 3.1-1. Use direct integration to find the Fourier transforms of the
signals shown below.
a) g₁(t) = II(t − 2) + 2 exp (−3|t|)
b) g(t) = d(t+2)+3e¯u (t − 2)
3-2)
Lathi & Ding prob. 3.1-5. From the definition in eq. 3.1b, find the inverse Fourier transforms of the
spectra in the figure below.
G(f)
COS лf
10
(a)
G(f) 1
-B
B
(b)
Fundamentals of Energy Systems HW 4 Q2
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...
Knowledge Booster
Learn more about
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
- Fundamentals of Energy Systems HW 4 Q4arrow_forwardFundamentals of Energy Systems HW 4 Q6arrow_forwardConstruct a battery pack to deliver 360V and 450-mile range for a vehicle that consumes 200 Wh/mile, from prismatic cells with 25Ah and 3.6 V. Physical dimensions of the cell are 0.5 cm thickness, 20 cm width and 40 cm length. a) Report configuration of the battery pack. 10-points b) Resistance of each cell is 0.05 Ohm, calculate the total internal resistance of the battery pack. 10-points c) Calculate the voltage drop during discharge when the battery is discharged at 100A. 10-points d) Calculate the amount of anode and cathode to build a prismatic cell with 25Ah capacity. Assume the cell chemistry as: Si anode and [Li(Ni1/3Co1/3Mn1/3)O2] cathode. Atomic weight of elements: Li=7, Si = 28, Ni=58, Co=59, Mn=55, O=16, 10-points e) Calculate the theoretical specific energy (Wh/kg) and practical energy density (Wh/liter) of the battery pack. 10-points f) Calculate the thickness on anode and cathode coating assuming each electrode has 30%…arrow_forward
- I need help with this problem and an explanation of the solution for the image described below. (Introduction to Signals and Systems)arrow_forwardDesign a battery pack for an electric bike that consumes in average 10Wh/mile and drive 30 miles per charge. The battery state of charge window is 80%. Design the battery by using new commercial cylindrical cells with 20mm diameter and 80mm height. The battery is constructed based on graphite anode C6 and cathode Li(Ni0.8Co0.15Al0,05)O2 that provides 3.75V at the cell level and 10Ah capacity. Density of anode is 2.2 g/cm3 and density of cathode is 4.5 g/cm3. Report on the battery pack configuration if the required battery pack voltage is 75 volts. If the thickness of anode and cathode is limited to 130 microns (130 x 10-4 cm) calculate the total electrode surface area in each cell. Assume the porosity of electrodes are 30%. Calculate the weight of active materials (anode and cathode) in grams and the total current collector’s and electrolyte membrane areas in (cm2).arrow_forwardDO NOT USE AI NEED HANDWRITTEN SOLUTION Find total impedance of circuit in polar form and power factor.arrow_forward
- Do NOT WANT AI. need diagram fully labeled pleasearrow_forwardCalculate the current magnitude in the coils e1, e2 of theMagnetic circuit, if:ɸa = 3.00 x 10^-3 Wb, φb = 0.80 x 10^-3 Wb, ɸc = 2.20 x 10^-3 Wb L ab = 0.10 m,A ab = 5.0 cm^2L afeb = L acdb = 0.40 mA afeb = A acdb = 20 cm^2 MATERIAL CHARACTERISTICSH (At/m) 240 350 530 1300 5000 9000B (T) 0.7 0.9 1.1 1.3 1.5 1.6arrow_forwardA toroid magnetic circuit is composed of three sections A, B and C, thesection C has an air gap, section A has an 850 round coil thatconsumes a current of 1.2 A. the physical and magnetic properties of each sectionare: Section A: Length = 80 mm, Cross section = 120 mm^2, μr = 400 Section B: Length = 60 mm, Cross section = 40 mm^2, μr = 250 Section C: Length = 50 mm, Cross section = 200 mm^2, μr = 600 Gap: Length = 1 mm, Cross section = 40 mm^2, μr = 1 Calculate:The magnetic field density in each of the sectionsarrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
How Electric Motors Work - 3 phase AC induction motors ac motor; Author: The Engineering Mindset;https://www.youtube.com/watch?v=59HBoIXzX_c;License: Standard Youtube License