5. If a potential difference of 240 V is applied to a field winding at 15°C and the current is 4 A. The mean temperature of the winding when current has fallen to 3.129 A, applied voltage being constant. Assume a15-1/254.5, is: a. 86°C. b. 76°C c. 83°C.

5. If a potential difference of 240 V is applied to a field winding at 15°C and the current is 4 A. The mean temperature of the winding when current has fallen to 3.129 A, applied voltage being constant. Assume a15-1/254.5, is: a. 86°C. b. 76°C c. 83°C.

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 8RQ

See similar textbooks

Related questions

Q: Q1: What does happen if we change two currents? Q2: What does happen if we have a three-phase four…

A: to find the answers in the below steps

Q: A three-winding transformer is connected to an AC voltage source as shown in the figure. The number…

A: Given- 3 winding transformer, Number of turns- N1=100,N2=50,N3=50, Currents in secondary side- 2∠30o…

Q: 10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A.…

A: First Calculate the resistance of winding at 15°C: R15=2505R15=50 Ω Now Calculate the resistance of…

Q: 1.Two identical shunt generators running in parallel, each with armature resistance of 0.02 ohms and…

Q: Q.4/ choose true or false: 1. The reluctance of any core is proportional directly with the length of…

A: As per Bartleby guidelines we are allowed to solve only three subparts, please ask the rest again.

Q: Voltage

Q: A single-phase 111-V, 50-Hz supply is connected to a coil with 200 turns of a coil-core assembly as…

A: In this question, We need to determine the magnitude of the maximum flux in the core.

Q: The generated emf

Q: a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.1 milli…

Q: Harmonics generated in a machine related to the distribution of windings is Answer:

A: Harmonics generated in a machine related to the distribution of winding is

Q: A magnetic ring has reluctance of 1.675 x 106 AT weber. The flux to be produced by the coil is 800 x…

A: Given a magnetic ring has, Reluctance = 1.675×106 ATweber Flux = 800×10-6 weber.

Q: a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.3 milli…

A: The solution to both the parts is attached below.

Q: The frequency of voltage generated in SG depends on: Select one: a. Number of poles b. number of…

A: The synchronous speed of SG is So the frequency of voltage generated in SG depends on number of…

Q: The primary of a certain transformer takes 1 A at a power factor of 0.4 when connected across a 230…

Q: a) A sinewave is having a frequency of 50 Hz and instantaneous value of 150 Volts at 1.2 milli…

Q: Q9 / What are the function of brushes , pole and commutator in DC machine

Q: A potential difference of 250V is applied to a field winding at 15 C and the current 5A. What will…

Q: Derive the expression for equivalent inductance for the following: 1. When two coils connected in…

A: Since you have asked multiple questions in a single request, we will be answering only the first…

Q: Deduce the emf equation of a transformer. Prove that the emf induced in the windings of a…

Q: a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli…

A: Sine wave given

Q: a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli…

A: Sine wave

Q: The core of a transformer operating at 50 Hz has an eddy current loss of 100 W/m3 and the core…

A: eddy current loss is given as Pe= k f2Bm2 t2

Q: The maximum speed of an alternator working at 60 Hz is possible when the number of poles of the…

A: We know that the alternator's maximum speed is synchronous speed.

Q: Q9. What is the basic principle that a cage winding can be represented by a three-phase winding?…

Q: Generate a conclusion on this following statements: Determine and analyze the voltage regulation…

A: GIVEN: resistive load inductive load capacitive load DETERMINE: the…

Q: The primary ofa certain transformer takes 1 A at a power factor of 0.4 when connected across a 230…

Q: a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.5 milli…

A: The solution is attached below for the given problems

Q: 7. A coil having a resistance of 20 ohms and an inductance of 0.75 henry is connected in series with…

A: In this question, We need to determine the rate of current change and power delivered by the…

Concept explainers

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

5. If a potential difference of 240 V is applied to a field winding at 15°C and the
current is 4 A. The mean temperature of the winding when current has fallen
to 3.129 A, applied voltage being constant. Assume a15= 1/254.5, is:
a. 86°C.
b. 76°C
c. 83°C.

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 3

VIEW

Step by step

Solved in 3 steps with 3 images

SEE SOLUTION Check out a sample Q&A here

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

a) A sinewave is having a frequency of 50 Hz and instantaneous value of 150 Volts at 1.2 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and i) The value of voltage at 1.7 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=100 Volts, Time period is 5 milli seconds and 0 =50 degrees. Vp i= 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.7 ms b) Angular frequency %3D
a) A sinewave is having a frequency of 100 Hz and instantaneous value of 150 Volts at 1.4 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 1.7 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=200 Volts, Time period is 5 milli seconds and 0 =40 degrees. Vp t = 0 Upload your Answers steps in the "Final Answer Submission" Link provided in the Moodle. a) (i) Maximum value = a) (ii) Value of voltage at 1.7 ms = b) Angular frequency =
Derive the expression for equivalent inductance for the following: 1. When two coils connected in series and the flux is adding. 2. When coils are connected in series but flux is opposing. 3. When coils connected in parallel and flux are adding. 4. When coils are connected in parallel but flux are differential coupled
A 5-ohm resistor is connected in series with a 25 micro-farad capacitor. A source voltage of158 volts, 50 Hz supplies the combination. Determine the following:a. Circulating currentb. Voltage across the resistorc. Voltage across the capacitord. Real power supplied by the source
7. A coil having a resistance of 20 ohms and an inductance of 0.75 henry is connected in series with a 30-ohm resistor and to a 120-volt d-c source. A switch across the series resistor is then closed, and the circuit is assumed to be in a steady-state condition. At the instant the switch is opened, what will be the rate of current change and the power delivered by the magnetic field.
Answer the question quecly please High voltage
Q9 / What are the function of brushes , pole and commutator in DC machine
Please answer pleas
a) A sinewave is having a frequency of 50 Hz and instantaneous value of 250 Volts at 1.1 milli seconds. Find i) The maximum value of sinusoidal voltage waveform and ii) The value of voltage at 2.1 milli seconds. b) Determine the instantaneous equation for the voltage waveform shown in figure, if Vp=150 Volts, Time period is 15 milli seconds and =50 degrees. Vp t = 0 Ф II
Topic- basic & const.
A A d.c. generator running at 25 rev/s generates an e.m.f. of 150 V. Determine the percent- age increase in the flux per pole required to generate 180 V at 20 rev/s.
....