10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature coefficient at 15'C is equal to 1/254.5 per °C

10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature coefficient at 15'C is equal to 1/254.5 per °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: The value of current needed in 200 turns of figure Q3 to develop a flux of 0.6 mWb is?

A: Given Data: N = 200 turns flux = 0.6 mWb A = 2 * 10 ^-3 m2

Q: he resistance of the copper field winding of a dc machine at 40 degree Celsius is 0.40 ohms. After…

A: GIVEN, R1=0.40ohm t1=40∘C α=0.00393 ( for cu field…

Q: 3. If the ratio of V/F has been kept constant and the observed value of hysteresis loss at rated…

A: In this question, core loss is given at 50 hz ...We have to find out core loss at 60 Hz..

Q: In the secondary. The cross-sectional area of the core is 80 sq. cm. If the primary winding is…

A: In single phase transformer, consider the primary turn is N1=500 and the secondary turn is N2=1200.…

Q: Q4. List different formulae for power in a dc circuit using Ohm's law.

A: In this question we will find power in DC circuit using ohms law...

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: purpose of brushes in a dc machine is__________. to change ac to dc signal to remove the losses in…

A: brushes in DC machine is placed between rorating commutator and external circuit. We will consider…

Q: Find the relative permeability of the typical ferromagnetic material whose magnetization curve is…

Q: . What are the various losses in an induction motor? On what factors do they depend

A: The fallowing are the various losses that occur in an induction motor:

Q: While discussing electric motors: Technician A says that when there is high CEMF, there will be high…

A: Given, While discussing electric motors: Technician A says that when there is high CEMF, there will…

Q: A thicker wire is used in the DC series field winding than DC shunt field winding in DC machines. *…

A: current carrying capacity of wire is directly proportional to area of wire. i.e. thicker the wire ,…

Q: The coil winding in PMMC meter is -1 large heavy fine small

A: Electrical devices are used for measuring electrical parameters. Current, voltage and power are…

Q: In the field circuit model of a DC machine, a variable _____ is usually inserted in series with the…

A: The solution is given below

Q: Starting from e = Blv, derive an expression for the induced voltage in a DC generator.

Q: Explain what is a stiff supply system ? What is its importance in harmonic environment? ARC

A: To explain the stiff supply system

Q: Q3:B: Name general types of DC generators and make a sketch of their connections

Q: A self-excited DC generator has a rated voltage when the field current is at rated current. Select…

A: There are many types of self excited DC Generators. The DC Shunt Generator is also a type of self…

Q: Refer to the tow magnetically coupled coils of figure bellow the polarity of the mutual voltage is :…

A: Resistors, inductors and capacitors form an integral part of any electrical circuit. A source,…

Q: Three ideal CTS with turns ratios of 600 : 5 configuration as shown in Figure 3 21a and b

A: Since the CTs are connected in star-delta configuration, so there is a phase difference of 30°…

Q: What is the effect on induced voltage of adding more turns of wire to a coil

A: The equation of magnitude of induced voltage in a coil (E) is given by: Where, The number of turns…

Q: __ is used to convert AC to unidirectional current in DC machine.(estimated time 1 minute) a.…

A: A commutator in a DC Machine has substitute groups of Copper and mica. Presently when the armature…

Q: A source of 100 volts rms is supplying a resistance 80 ohms in parallel with a 200 mH inductor. To…

Q: Consider a toroidal core, as shown in Figure 14.11 on page 709, that has a relative permeability of…

A: According to question: Magnetomotive Force…

Q: The field winding of a dynamo may be taken to have a constant inductance of 120 H and an effective…

A: When the supply is interrupted, the current through the inductor is 5 A. As the indicator does not…

Q: The Dc value of a pure Ac voltage source is zero Select one: True False

A: In this question we need to verify the given statement is true or false

Q: self excited DC generator field wit nergized by its own DC supply elect one: OTrue OFalse

A: DC generators can be classified into self excited and separately excited.

Q: State the Method of connection of different field coils. ( In DC Machines )

A: Field coil - The Field coil is define as the electromagnet used to generate magnetic field it…

Q: what is the effect of number of turns and radius in inductance

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

Q: the field windings of a series motor has a resistance of 120 ohms at 15° c. after running for 2…

A: Given The temperature coefficient of winding at 00c is 0.004 The Resistance of winding at (T1) 150c…

Q: The capacitance is defined as O The flux linkages per ampere O The charge per unit of potential…

A: A capacitor is an electric device that stores charge in the form of electric potential energy. A…

Q: Flux ines are..to the surface of the poles If the poles are concentric to the rotation of a coil,…

A: Electrical machines can be either generator or motors. They can be either Ac machines or DC…

Q: A potential difference of 240 V is applied to a field winding at 15 °C and the current is 4.8 A.…

A: Given data, Potential difference V = 240 V. Current at temperature 150C is 4.8 A. Current at mean…

Q: A toroidal core with a mean circumference of 100 cm and a cross sectional area of 10 cm2 is wound…

Q: The principle operation of LVDT is based on the variation of Select one a. Self inductance b.…

A: Right Answer option C.Mutual Inductance

Q: 2-The Magneto motive force of a steel-ring of 25 cm mean diameter If it is wound uniformly with 700…

Q: Q8/ A constant potential difference of 250 V is applied to a field winding at 15 °C and the current…

Q: 2. AC-core with a gap of 0.0001m has a coil number of 100 and a current of 10mA. First find the…

A: reluctance = Lμ0μrA flux in the core = MMFReluctance

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

Q: The resistance of the field winding(copper wire) of a DC machine is 0.25 ohm at 25°C. When operating…

A: In this question we need to find a resistance of the field winding at full load.

Q: tate the principle of Ac generator.

A: AC generator - An alternating current generator (AC generator) is a system that transforms…

Q: The field windings of a series motor have a resistance of 120 ohms at 15 o C. After running for two…

A: In this question we need to find a temperature rise of a field winding of series Motor. The given…

Q: Number of coil windings 300; slit width 12 mm How can I get the calibration factor by using ampere's…

A: We have given the following problem Number of coil windings 300; slit width 12 mm How can I get the…

Q: The resistance of the field coils with copper conductors of a dynamo is 120 ohms at 25°C. After…

A: It is given that: R1=120 ΩT1=25°CRf=240 Ω

Q: The value of armature current in the waveform is 12 A, a = 52 degrees, and ß = 154 degre %3D RMS…

Q: What is neutral setting in DC machines related to its brush position. What if the brushes are…

Q: The field winding of a.d.c. machine takes a steady current of 10A when connected to a d.c. source of…

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…

Q: 13.a. Eddy-current loss in the stator core can be reduced by using A. alloys with low resistivity.…

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

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

10. A potential difference of 250 V is applied to a field winding at 15-C and the current is 5 A. What will be the
temperature of the winding when current has fallen to 3.91 A applied voltage being constant. Assume temperature
coefficient at 15'C is equal to 1/254.5 per °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 Conclusion

VIEW

Step by step

Solved in 2 steps

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

Q9 / What are the function of brushes , pole and commutator in DC machine
A magnetic ring has reluctance of 1.675 × 10⁰ AT weber. The flux to be produced by the coil is 800 x 10 webers, then the AT required for the m.m.f. will be
Please answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. The coil of a generator has an equivalent resistance of 1.5 ohms at 20 °C. After being used for several hours, the resistance is found to be 1.75 ohms. Determine the temperature of the coils at this time. The temperature coefficient of resistance at 0 °C of the coil is 0.004 OC-1.
Ip Ep=40 V f = 60 Hz N₂= 20- N₁ = 120 Find the maximum flux om om = Find the magnitude of the induced secondary voltage Es Es = units + Is Es units If the coefficient of coupling (k)= 0.75, determine the magnitude of the induced secondary voltage Es Esk=0.75 = units
A dc machine has hysteresis loss of 300 W and an eddy current loss of 200 W when running at 1200 rpm. At what speed will the total core losses be a quarter of the original if the flux is to be twice as the original.
What are the rotating parts on d.c machine. commutator segments O brushes O inter-pole O pole shoe
Armature winding of an alternator can also be described as
An AC source provides peak output Vi and peak current ii when connected to the coil primary of a transformer. The transformer has Np turns in the primary coil and Ns turns in the secondary coil. A resistance circuit R is connected to the transformer, see figure below. What is the equivalent resistance of the circuit?
Magnetic field force lines created by the primary coil in transformers pass through the secondary coil and an induction current occurs in the secondary coil. What is the reason for induction current in the secondary coil?
A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core is
Q5. For the following center tapped transformer, show the waveform across each half of the secondary winding and across R, when a 100 V peak sine wave is applied to the primarywinding. What is the PIV rating must the diodeshave? (Use constant voltage drop model for the Silicon diode) D IN4001 OV 10 kN IN4001 DELL
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.