Answered: If the frequency applied to a 3-ph…

If the frequency applied to a 3-ph induction motor is increased by 44%, then the ratio of the Initial value of maximum torque to the New value of maximum torque is equal to: Answer:

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 6RQ: Name three factors that determine the torque produced by an induction motor.

See similar textbooks

Related questions

Q: Describe the similarities in the construction of a DC motor and a DC generator.

A: From a mechanical standpoint, a DC motor and a DC generator are quite similar, but from a technical…

Q: In DC machines, provides the magnetic path as well as the mechanical support to the whole machines.

Q: 29. In a motor, the armature resistance is 0.1 ohm. When connected across 110 volts mains, the…

A: Given data, Armature resistance, Ra = 0.1 Ω. Main supply voltage, V = 110 V. Armature current, Ia1…

Q: 27. A 440 Volt short shunt compound generator has a full-load current of 200 Amp. Its armature…

Q: 6. A shunt generator when running light as a motor at 1000 rpm takes 12 Amp from 115-Volt mains. The…

Q: Q1:B: How to solve the commutation problem in de machines

A: Need to explain how to solve commutation problem in DC machine

Q: What is MOORE machine?

A: Moore machine is a Finite state machine where the output will depend on the present state only. It…

Q: Indicate whether the following - statement are true or false

A: in the DC machine the emf can be calculated using the following equation E = ∅ZPN60 A

Q: The interpoles in DC machines are: O a. Used to maintain constant magnetic flux O b. Used to…

Q: Question An alternator of 300 kW is driven by a prime mover of speed regulation of 4% and another…

A: Given- 300 kW alternator, Speed regulation=4%, 200 kW alternator, Speed regulation=3%, To Find- The…

Q: h a labelled diagram of any DC machine Discuss it part

A: A self-excited DC shunt motor, also known as a shunt wound DC motor, is a form of self-excited DC…

Q: The core of an electro-magnetic structure is Laminated in order to: reduce the Stacking Factor…

A: Core of the transformer:- The core is constructed of numerous thin strips of grain-oriented silicon…

Q: Mechanical losses represent: A. Windage losses B. None of the other choices are correct O C. Losses…

A: In this answer let us try to understand what are mechanical losses as explained below.

Q: the armature mmf can be -2 reduced by reluctance of the magnetic the circuit in the region of the…

A: The explanation is as follows.

Q: Following data are obtained by slip test on a salient pole machine: Idmax = 10 A 'dmin = 6.5 A…

A: Given- Slip test on a salient pole machine- Idmax=10 AIdmin=6.5 AVdmax=30 VVdmin=25 V To Find- The…

Q: Example 4: The armature winding of a 200-V, 4-pole, series motor is lap-connected. There are 280…

Q: prove the formula of generated voltage of dc machine

A: The derivation is as follows.

Q: 2/ Explain the internal and external characteristics of de generator (draw each case).

Q: B. Write down the expression of voltage induced voltage when DC machine act as I. Motor II.…

A: The number of poles of the machine = P The flux per pole in weber = ϕ The total number of armature…

Q: DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A,…

A: Alternator- Alternator is a form of machine which is used to convert mechanical energy into…

Q: PRELIMINARY WORK 1. Calculate the cut off frequencies and central frequency of the circuit given in…

A: We need to calculate lower cut off frequency and higher cut off frequency and central frequency . We…

Q: Write the types and shortly explain the magnetic losses for electrical machines

A: we need to explain the types and shortly explain the magnetic losses for electrical machines

Q: The armature of a d.c. The machine has a resistance of 0.25 ohm and is connected to a 300V supply.…

A: The back emf is modeled as an opposing variable emf to the emf powering the motor. When the motor is…

Q: How voltage is built up in dc shunt generator

A: as the name suggests the field winding of the shunt generator is connected in parallel with the…

Q: b) Prove that the equation for the induce voltage of a single simple rotating loop e ind Is just a…

Q: The following are the magnetic characteristics of a D.C. generator driven at 1000 r.p.m. It (A) 1 2…

A: Generator is used for the conversion of mechanical to electrical energy An Dc . Principle of DC…

Q: Q4/ The OC curve of a d.c. shunt generator for a speed of 1000 r.p.m. is given by the following…

A: For the given data Field current: 2.0 3.0 4.0 5.0 6.0 7.0 E.M.F. volts: 102 150 188 215…

Q: A 220 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 ohm. If the…

A: Given: A 220 V DC machine supplies 20 A at 200 V as generator. V=200 VIa=20 A The armature…

Q: (a) Explain briefly what is fringing effect and leakage flux.

A: “Since you have asked multiple questions, we will solve the first question for you. If youwant any…

Q: (i) Plot the O.C.C. for 375 r.p.m. and determine the voltage to which the machine will excite if the…

Q: 174. The EMF induced in the armature of a shunt generator is 500 V. The armature resistance is 0.2 2…

A: In this question, We need to choose the correct option What is terminal voltage of the DC shunt…

Concept explainers

Winding and Constructions

Alternating Current (AC) winding is generally of the 3-phase type due to the inherent advantages of the 3-phase machine. Armature coils must be connected to the yield balance (equivalent in magnitude and 2/3 of the series phase difference of the rod) 3-phase electromotive forces (emf). The armature should be divided into step-bands to start with slots around the perimeter.In the construction of AC machines, the frame is used as an external protective shield to protect it from environmental conditions. The frame also serves as the outer perimeter, allowing the interior to be easily placed. The static state section of the devices is the stator winding attached stator.

Question

Machine 2

If the frequency applied to a 3-ph induction motor is increased by 44%, then the ratio of the Initial value of
maximum torque to the New value of maximum torque is equal to:
Answer:

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Winding and Construction of the Rotor and Stator

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

Induction motors and welding transformers require magnetizing current, which causes a. lagging power factor. b. leading power factor. c. unity power factor. d. zero power factor.
The speed of an induction motor fed from a 3-phase and 50 Hz source is 1440 rpm, so which of the following is the number of poles of the motor?a)2b)4C)6d)8f) 12
The Squirrel cage induction motor has less efficiency. Select one: True False
A 415V squirrel cage induction motor develops a torque of 40NM. The torque developed by the motor if the supply voltage drops to 380V is
3. What are the various losses in an induction motor? On whatfactors do they depend?
A four-pole induction motor drives a load at 2575 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. ▾ Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit ▾ Part B Value μÀ Submit I= Value Provide Feedback ^ Request Answer If the dc-to-ac converter has a power efficiency of 85 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. 4 Ò Request Answer Units ? Units ?
At standstill condition , the slip of induction motor is 1. Select one: O True O False
8. A 3-phase induction motor is running at 2% slip. If the input to rotor is 1000 W, then mechanical power developed by the motor is ............ (i) 20 W (iii) 500 W (ii) 980 W (iv) 200 W
A 3-phase induction motor has a starting torque 100% and a maximum torque of 200% of the full load toque. Find the slip at maximum torque. Answer: 26.8%
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
A four-pole induction motor drives a load at 2478 rpm. This is to be accomplished by using an electronic converter to convert a 400-V dc source into a set of three-phase ac voltages. Part A Find the frequency required for the ac voltages assuming that the slip is 4 percent. The load requires 2 hp. Express your answer to three significant figures and include the appropriate units. f= Submit Part B Value I = HA Request Answer Submit If the dc-to-ac converter has a power efficiency of 90 percent and the motor has a power efficiency of 80 percent, estimate the current taken from the dc source. Express your answer to three significant figures and include the appropriate units. HÅ Value Units Request Answer ? Units ?
If two 3-phase induction machines are mechanically coupled with each other. The two machines are supplied by 50 Hz and 60 Hz, respectively. the speed of the combination of both machines will be: