A potential difference of 240 V is applied to a field winding at 15 °C and the current is 4.8 A. What will be the mean temperature of the winding, in °C, when current has fallen to 3.6264 A, applied voltage being constant. Assume α = 1/254.5 at 15 °C.

A potential difference of 240 V is applied to a field winding at 15 °C and the current is 4.8 A. What will be the mean temperature of the winding, in °C, when current has fallen to 3.6264 A, applied voltage being constant. Assume α = 1/254.5 at 15 °C.

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter29: Dc Generators

Section: Chapter Questions

Problem 1PA: You are working as an electrician in a large steel manufacturing plant, and you are in the process...

See similar textbooks

Related questions

Q: 3. The length of a Germanium material is 10 cm and its area is 5 cm2. Check in slide 30 the resistiv...

A: Resistance: In the resistance, the power dissipation occurs in the form of heat. Its unit is Ohm.

Q: The circuit shown in the following in figure has: VIN 10 V, Vz 7.2 V@ Iz-40 mA, IzK =2 mA, Iz= 100 m...

A: Note: We are authorized to answer three subparts at a time, since you have not mentioned which part ...

Q: An aluminum bar 1.8 meters

Q: 3. The switch is opened at t = 0, after it was closed for a long time. If L = 0.9mH, Vs = 12V, R1 = ...

Q: V3 A R1 R3 R5 10 V1 12 R2 R4 V2 20 Reference Node 12

A: The given circuit diagram is shown below:

Q: Find the Output response (Impulse, Step, Ramp, Parabolic) for each of the systems below and time con...

A: "As per our guidelines, we are supposed to answer only first three subparts. Kindly repost the ...

Q: A DC shunt motor develops 15 Hp at 120 Volts. The armature efficiency is 95%. What is the armature e...

Q: Question 1 R1 R2 What is the equivalent resistance of the circuit shown above if R, = 9.0 Q and R2 =...

Q: An electric field of 3.6 x 10° N/C passes through an area of 4.1 cm? perpendicular to the surface. D...

Q: Transform the vectors F 10 a, to spherical coordinates at (4, 110°, 120°)

Q: The hysteresis loop of the core material of a transformer should have (a) a large area (b) a small a...

A: When a transformer is in use, its core is taken up by many complete magnetization cycles. During eac...

Q: 7. Given the following resistance R, = 10 Q, R2 = 6 N, R3 = 50, R, = 20 Q and voltag V, = 12V and V,...

Q: Using the following matrix, please come up with a state space representation with the following para...

A: Output response is given asy1t=2θ1ty2t=4θ1t+3θ2t+ςty1ty2t=2043θ1tθ2t+01ςt-----1This is state space r...

Q: 1. Solve for the transfer function of the system given below using the voltage of the 4F capacitor a...

A: TRANSFER FUNCTION Transfer function of the system is defined as when the initial conditions ...

Q: It is the ratio of the units of electricity generated per year to the capacity of the plant installe...

A: The ratio of the units of electricity generated per year to the capacity of the plant installed in t...

Q: In the circuit, the current through R2 in mA is __

Q: A resistance of 10 2 and a capacitance of 100 pF is connected in series to the parallel combination ...

Q: 4. Use the circuit shown in Figure P4.4 to find the indicated quantities. a) Find the power delivere...

Q: *For #1 and #2, the 1. Given the figure below, find the following: distance is 1m a. What is the ele...

A: In this question, We need to determine the electric force on the charge. We know force between two...

Q: Two similar 6,600-V, three phase generators are running in parallel on constant-voltage and frequenc...

Q: A magnetic circuit has a 20 V battery connected to an 80 2 coil of 800 turns with an iron bar of 2 m...

Q: For the Circuit shown below, tetal gain Gr) = 6o dB ; A = l6 , Bw= 5 KHZ; f=AMHZ %3D %3D %3D ; Ri= I...

A: For the amplifier circuit,GT=60dBA=105BW=5kHzRi=1MΩRo=70Ω

Q: Va O 13V i3 20 2A (4

Q: Which of the following source of power is least reliable?

Q: PART III: Solve the following: 1.) For the circuit shown below, determine (c) the charge stored in t...

A: In this answer we will try to find the charge stored inside the capacitors C1 and C2 as explained be...

Q: 23. Given a set of capacitors: 7nF, 6nF, 5nF, 4µF, 3pF and 10µF, solve the following problems: a. So...

Q: short hollow, cast iron cylinder with wall thickness o 0 mm is to carry compressive load of 100 kN o...

A: Given that P=100kN=105Nσ=80N/mm2=80×106N/m2t=10mm=.01m

Q: 12. Determine the work needed to move a 13.3 mC charge from 1.2 mm to 0.41 cm. 20 pr for th

Q: 3. By applying the final-value theorem, find the final value of f(t) whose Laplace transform is give...

A: Note: We are authorized to answer the first question since the exact one wasn’t specified. Please su...

Q: Problem 5 Compute the power delivered to the load by the three-phase generator in the circuit shown ...

A: The solution is given below

Q: Given the circuit below. i, (t) = v210 cos(377t). Give your answer in four decimal places if it is n...

A: In this question, What is type of the system? What is impedance? And value of X? What is rms curr...

Q: 6. Given the following resistance R, = 100, R2 = 50, and R, = 50, and voltage V; = 20V and V, = 12V,...

Q: Q5/ Using Kirchhoff Laws for the circuit below determine the value and the direction of the current ...

A: Kirchhoff's Law Kirchhoff's Current Law Sum of entering current = Sum of Leaving current Kirchhoff's...

Q: Two impedance coils A and B are connected in series to a 111-volt ac source. Coil A has a resistance...

Q: Given the circuit below. i, (t) = V210 cos(377t). Give your answer in four decimal places if it is n...

A: Student asked to solve only question number 3. So according to student request I have answered quest...

Q: Activity 3: Electric Motor Vs. Generator Objective: Compare the electric motor and generator You wil...

A: Given: Details of electric motor and electric generator. To find: Venn diagram for electric motor an...

Q: The voltages va, Vb, and ve in below Figure are the node voltages corresponding to nodes a, b, and c...

Q: Apply DeMorgan's Theorem to the expression: [(A + B')(C + D')]'

A: In this question, The given expression [(A + B')(C + D')]' Solve the given expression Apply DeMorgan...

Q: Vs f = 150 Hz C 0.1 μF

Q: Jung Kook stayed at McDonald's and ordered a cup of hot coffee. When the coffee was served at around...

A: Thermometer- It is a basic device which is used to measure the temperature with the help of mercury ...

Q: On a deck of cards, 2 cards are draw at random. What is the probability of getting an A and a king? ...

A: The solution is given below

Q: A 25 kVA, 220V, 3φ alternator delivers rated kVA at a power factor of 0.84. The effective ac resista...

A: Pout= 250.84 = 21KWI0 =250003×220=65.61ARa =Rt2=0.182=0.09 ohmLosses:-a) armature winding- Pa = 3I...

Q: Determine the values of the node voltages, v1, V2 and v3 in the circuit shown. 15 V 50 Ω 10Ω 20Ω 25 ...

A: In this question, 3 independent voltage source is given. Find the Voltage at the 3 nodes as shown ...

Q: A 5-kW 125-V shunt generator operates at 1800 r/min. If the field current is 1.8A and the armature r...

Q: Deep-sea exploration is a challenging task in a petroleum industry. High pressure, huge area and une...

Q: e2t –1 Given x (t) explain if this signal is: e2t +1 A. odd? B. even? C. periodic? D. random?

Q: Find the z-transfer function Y(z)/U(z). u(t) -2T: 1 – e s(s + 1)

Q: Q2) A lossless transmission line is terminated with a 1002 load. If VSWR on the line is 1.5, fined t...

A: VSWR=1+Γ1-Γ1.5=1+Γ1-Γ1.5×1-Γ=1+Γ1.5-1.5Γ=1+Γ1.5-1=1.5Γ+Γ0.5=2.5ΓΓ=0.52.5Γ=0.2 so, Γ=0.2 and Γ=-0.2

Q: An electric field of 0.151 N/C passes through a vector area of 3.1 cm?. Calculate the electric flux.

A: We have given the following problem

Q: Question 1 R1 R2 What is the equivalent resistance of the circuit shown above if R1 = 9.0 Q and R2 =...

A: Given circuit, Where, R1=9 ΩR2=6 Ω

Concept explainers

DC Generator

An electromechanical machine which converts input mechanical energy to respective output electric energy is called a generator.

Question

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

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

An inductance of 2 henries and a resistance of20 ohms are connected in series with an emfof E volts. If the current is zero at time, t = 0,find the current at the end of 0.01 sec if E =100sin150t volts.
Lenz stated, “A coil has an inductance of 1 _____ when a current change of 1 _____ per second results in an induced voltage of 1 _____.” Select one: a. ampere, volt, henry b. volt, henry, ampere c. henry, ampere, volt d. inductance, henry, volt
Materials in parallel, supplying a load of 500 amps, with a terminal voltage of 240 volts, and the resistance of the product circuit 0.04 Ohm The resistance of the field circuit is 60 ohms. Calculate a. Product current b. field current c. electromotive force
A coil of inductance 1 henry and a resistance of 20 ohms is connected to an emf E=200sin(20t) . What is the DE model relating the current I and time t described in the problem?
A four pole lap one armature running at 1500 RPM delivers a current of 150 amperes and has a 64 commuter segments. The brush spans 1.2 segments and inductance of each armature coil is 0.05 mH. Calculate the value of reactance voltage assuming (i) linear communication (ii) sinusoidal commutation. Neglect Mica thickness. (Our subject is ELECTRICAL MACHINE 1)
1. What are the two necessary conditions for a thyristor to begin conduction? 2. Once a thyristor begins to conduct, what condition(s) is necessary to cease conduction? 3. Why is the conduction angle greater with an inductive load than with a purely resistive load?
A 1Φ, 120 V rms, 60 Hz supply is connected to the coil, the coil has 200 turns. The parameters of the core are as follows:Length of core =100 cm Cross-sectional area of core = 20 cm2 Relative permeability of core = 2500 (a) Obtain an expression for the flux density in the core. (b) Obtain an expression for the current in the coil.
A coil with 2000 turns has a length of 20mm and a winding thickness of 5mm. If the coil carries 5mA current, which of the following is the value of mmf (magnetomotive force) produced? Please choose one: a.2000 A.t. b. 500 A.t C. 10 A.t. D.None
If a coil of wire has a resistance of 20ohms at 40oC and 20 at 80oC,what will be the resistance of the coil at 0oC. oC = degrees celcius
8. a) Inductors_________ oppose a change of current.a) always b) sometimes c) never d) all of the above B) What is the direction of a self-induced emf in relation to any change in current? a) . the same direction as the current flow that caused itb) the opposite direction as the current flow that caused it c) may laemettherlalgr "b" d) neither a nor b C). Hysteresis loss is caused by _________a) low voltage DC. b) poorly insulated conductors c) molecular friction d) none of the above
Physical properties that affect inductance are: 15) ________A) area of the coil, permeability, and amount of current flow.B) length of coil, resistance of the coil's wire, and number of turns.C) number of turns, voltage applied, and core material.D) core material, number of turns, length of the core, and cross-sectional area of the core.
GENERAL RLC CIRCUITS: Solve and show your solution completely. Make sure your answers are in 4 decimals places. The ohmic resistance of a large magnetic contactor is measured to be 20 ohms. A 230 V 60 Hzis impressed upon the contactor and the current is taken as 3.2 amperes. Neglecting core loss,determine the inductance of the contactor in mH.