6Multiple Choice 10 pointsUse the measured characteristics given in the figure. From the curves shown, this is220V Start160V Start190V Start,DC series motorDC shunt motorDC separately excited motorDC series generator160V Start220V Start190V Start

The graph shows the speed-torque characteristics of different DC motors.DC Series Motor:In a DC…

Answered: 6 Multiple Choice 10 points Use the…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Q2] Fill in the blank (9 Marks) 1-The current drwan by the armature of D.C. motor is directly proportional to 2- The speed of a D.C. shunt-wound motor will shunt field regulator is increased. 3- The synchronous speed of a three-phase induction motor is number of pairs of poles. Rotor copper losses Rotor input power in induction motor = 5- A 4-pole three-phase induction motor has a synchronous speed of 25 r.p.s. The frequency of the supply to the stator is_ Hz. 6- The power input to a mains transformer is 200VA. If the primary current is 2.5A, the secondary voltage is 2V and assuming no losses in the transformer, the turns ratio step down. is 7- A 200kVA transformer has an iron loss of 1 kW and full load cu loss of 2 kW. Its load kVA corresponding to maximum efficiency is kVA. 8- If cu loss of a transformer at 7/8th full load is 4900 W, then its full-load cu loss would be watt. 4- if the value of resistance of the proportional to the 9- The slight curvature at the lower end of the open…
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1. The operation of Commutator in DC Motor is * O a) to convert dc to ac O b) to convert ac to dc O c) to convert fixed dc to variable dc O reverse the current direction in the rotating windings each half turn
A split-phase motor starts properly and runs but quickly overheats. What's the most likely cause of this problem? A. Bearing problemsB. Open start windingsC. Stuck centrifugal switch D. Open run windings
A-1)- a- Which of the following is/are a general class of single-phase split-phase motor? a resistance-start induction-run b capacitor-start induction -run c) capacitor-start capacitor-run d) all of the aboveb-The single-phase split-phase motor operates on the principle of a rotating magnetic field. a) true b) false c- The voltages in a 2-phase power system are_______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above d-The voltages in a 3-phase power system are______ degrees out of phase. a) 90 b) 120 c) 180 d) none of the above e- Which of the two stator windings used on single-phase split-phase motors is made up of smaller wire? a) start winding b) run winding c) either "a" or "b" d) neither "a" nor "b"
Here it is the equivalent circuit of and induction motor and it is per phase circuit my question is name for me the variable for example R1 is the winding resistance and so an the all variable and please show me a pic of the real machine with the variable for example for R1 happens because of the winding i need to see the winding in the real machine, please help me to understand well
3-Phase 50Hz 6 pole induction motor has rotor resistance of 0.1 ohm and reactance of 0.92. ignore voltage drop in stator and assume thee rotor resistance is constant. Full load slip is 3%, then find Tmax /Tfl
6- Which of the following supply is given to the rotor winding of 3-Phase Induction Motor: a) DC Supply b) AC Supply c) No Supply d) Pulsating Supply 7- 3-Phase Induction Motor will have Starting Torque and Starting Current a) High, High b) Low, Low. c) High, Low d) Low, High 8- Which of the following method is used for controlling the speed of an induction motor: a) Changing number of stator poles b) Supply voltage control c) Frequency control d) All the options are correct 9- Which of the following method cannot be used for starting of 3-Phase Squirrel Induction Motor: a) Star-Delta Starting b) Line resistor startling c) transformer Starter d) Rotor Resistance Starting 10- The rotor of a stepper motor has no: a) windings b) commutator c) brushes d) all of the above
True or fulse
Which of the following single-phase split-phase motors performs better while running? a) resistance-start induction-rim b) capacitor-start induction-run c) both "a" and "b" perform the same while running d) neither "a" nor "b" 27. Which of the following single-phase split-phase motors has the better starting torque? a) resistance-start induction-run b) capacitor-start induction-run c) both "a" and "b" have the starting torque d) neither "a" nor "b" 28. Single-phase split-phase motors using an electrolytic capacitor in the start winding circuit should not be cycled more than about_____ time per hour. a) 8 b) 12 c) 24 d) none of the above 29. When replacing the capacitor in a capacitor-start induction-run motor, one must be sure to replace the bad capacitor with___________ti a) a smaller one b) one of the same size c) a larger one d) none of the above
Briefly explain the following: 1- The starting torque for a three-phase squirrel cage induction motor is 1.5 to 2 times the full-load torque, and the starting current is 5 to 6 times the full-load current? 2- The frequencies of the rotor currents at starting and at full-load are different? 3- The alternators cannot be connected to a live busbar when they are at standstill? 4- The three phase induction machines often called "rotating transformer"? 5- The three phase induction motor can rotates in reverse direction if two lines of the supply voltage are exchanged? 6- The magnetizing and demagnetizing effects of the armature current in the synchronous motor?
L-1). The 3-phase wound-rotor induction motor has .... . a) high starting torque b) low starting current c) both "a" and "b" d) neither "a" nor "b" L-2). The 3-phase wound-rotor induction.........a) motor has a wire wound rotor b) motor's rotor can be connected to an external resistive load by way of slip rings and brushes c) motor requires more maintenance than the 3-phase squirrel-cage induction motor d) all of the above L-3). The 3-phase wound-rotor induction motor's rotor circuit's resistance should be adjusted so it is__________ during starting. a) low b) high c) either "a" or "b" d) neither "a" nor "b" L-4). Will a 3-phase wound-rotor induction motor start with no external circuit connected to its rotor leads? a) yes b) no

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6 Multiple Choice 10 points Use the measured characteristics given in the figure. From the curves shown, this is 220V Start 160V Start 190V Start, DC series motor DC shunt motor DC separately excited motor DC series generator 160V Start 220V Start 190V Start