Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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A. The DC motor in Figure 3 on Worksheet 8 is aa) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) no
1- What is the starting torque developed by a split-phase or a capacitor start
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2- What is the current in-rush at the time of starting the motor? Does it cause
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Chapter 34 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 34 - Which NEC table is used to determine the full...Ch. 34 - A 5-HP single-phase motor is connected to 208...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - A squirrel-cage induction motor has a nameplate...Ch. 34 - A squirrel-cage motor has a nameplate current...Ch. 34 - A 100-HP three-phase squirrel-cage induction motor...Ch. 34 - A 60-HP synchronous motor is connected to 240...Ch. 34 - Prob. 9RQCh. 34 - Both the motors and the feeder in Question 9 are...
Ch. 34 - A 30-HP squirrel-cage induction motor is connected...Ch. 34 - Refer to the preceding Practical Application. When...Ch. 34 - Refer to the first Practical Application in this...Ch. 34 - A 10-HP single-phase motor is connected to 240...Ch. 34 - A 500-HP synchronous motor is connected to 2300...Ch. 34 - A 30-HP three-phase squirrel-cage induction motor...Ch. 34 - A 75-HP synchronous motor is connected to a...Ch. 34 - Prob. 5PPCh. 34 - A 350-HP squirrel-cage induction motor is...Ch. 34 - Three squirrel-cage motors are connected to a...
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- Shunt generator will build up its voltage when: Olts field resistance higher than critical value. Olts field resistance is less than critical value.arrow_forwardThe load resistance referred to stator is____ for the induction motor with slip 1% and rotor resistance is 2 ohms. a.100 ohms b.158 ohms c.98 ohms d.198 ohmarrow_forward1- b)Does a DC motor's full-load speed have to be the same as its no-load speed in order for it to be classified as a "constant speed" motor? a) yes b) no c). The voltage produced by the generator action of a rotating DC motor is called a) counter-electromotive force (CEMF) b) back-EMT' c) either "a" or "b" d) neither "a" nor "b" d). Which of the following is/are a factor that will determine the amount of back-EMF generated by the generator action of a DC motor? a) number of armature conductors b) number of lines of flux (flux density) c) the speed at which the conductors are cutting the lines of flux (rate of incidence) d) all of the abovearrow_forward
- 6.) . The NTD fuse rating for a 230 V, 3Ø, 50 hp synchronous motor with an 80 % power factor using the Exception Standard is A. 250 A B. 300 A C. 350 A D. 400 Aarrow_forwardOne type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forwardOn average, how many degrees out of phase with each other are the start- and run-winding currents in a resistance-start induction-run motor?arrow_forward
- If the field winding of a DC shunt motor gets disconnected while in normal operation the speed will decrease to a tremendously low value and the motor may get stop. * O True O Falsearrow_forwardQ2 (a) Explain, using phasor diagrams, what happens to a synchronous motor as its load is varied.arrow_forwardElectrical Engineering Quiz What if: 1. Induction motor's slots not evenly spaced. 2. Air gap distance change from 4 mm to 6 mm. 3. Broken in copper end- rings of squirrel cage I.M. 4. Broken in one brush of slip ring I.M. 5. Conductor bars of squirrel cage rotor in straight mode.arrow_forward
- H.W/ Definition all these terms: 1- Slip rings 2- armature reaction 3- synchronous motor V curve 4- damper windings 5- Synchronous machine ratingsarrow_forwardA DC series motor will _______if operated without a load. a. Operate a rated speed b. Operate slower than rated speed c. Operate slightly higher than rated speed d. Run awayarrow_forward4- A 3-phase A -connected 220-V (line-to-neutral), 60-Hz 6-pole induction motor has the following parameter values in /phase referred to the stator: R1 =0.294, R2 0.144, X 0.503, X2 0.209, Xm= 13.25. The total friction, windage, and core losses may be assumed to be constant at 403 W, independent of load. For a slip of 5%, a. Output torque b. Stator current, c. Power factor, d. Converted power e. Efficiency.arrow_forward
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Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
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