ELECTRICITY FOR TRADES (LOOSELEAF)
3rd Edition
ISBN: 9781260437454
Author: Petruzella
Publisher: MCG
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 24.1, Problem 2RQ
To determine
Obtain the synchronous speed of the 6-ploe AC motor with 60 Hz supply.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
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 small series-wound dc motor is operated from a 12-V car battery. Under a normal load, the motor draws 4.0 A, and when the armature is clamped so that it cannot turn, the motor draws 24 A. What is the back emf when the motor is operating normally?
what is the conclusion for the concepts of rotating amature and rotating field in an alternator?
Chapter 24 Solutions
ELECTRICITY FOR TRADES (LOOSELEAF)
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
- Appliances in home that use DC motor and briefly explain why it works as reverse DC generatorarrow_forwardDifferentiate between the AC and DC magnetic fields applied to an induction motor stator.arrow_forwardA four-pole DC motor has a wave-wound armature with 600 conductors. The armature current is 45 A and flux per pole is 8.5 mWb. Calculate mechanical power developed in this motor when running at 1420 rpm.arrow_forward
- In an induction motor, if the supply voltage is above normal then the machine will operate with High power factor Less heating O Low power factor O Less currentarrow_forwardA 110 V, 60 Hz, 6 – pole single phase induction motor 1/3 hp has the following equivalent circuit impedances: RI = 1.52 ohm, R2 = 3.13 ohm and x1 =2.10 ohm, x2 =1.56 ohm. Xm=58.2 ohm, The Friction, windage and stry losses =16W, the core loss = 35 W, For a slip of 0.05, calculation (a) input current, (b) power factor, (c) developed power, (d) output power, (e) speed (f) in put power (g) air gab power (h) T ind (i) T load 6) efficiency.arrow_forwardA 240 V, 4 pole wave wound dc shunt motor has 600 conductors on its armature. It has an armature resistance of 0.7 ohm and back emf of 210 V. Calculate its speed if it has a flux per pole of 10 mwb.arrow_forward
- A 240 V, 50 Hz, single-phase capacitor start a.c. motor is loaded such that the ship is 6% The motor constants referred to the stator are: Stator resistance = 2-22; Rotor resistance = 3-852 Stator reactance = 3.0; Rotor reactance = 2-12 Magnetising reactance = 862; Iron and friction loss = 50 W Draw the equivalent circuit and from it find the output power and efficiency at the given loading.arrow_forwardQ25) i) What are the factors that the induced voltage in three phase induction motor depends upon and Explain how the rotating magnetic field is produced in the three phase induction motor.arrow_forwardA 230v DC series motor takes 30A when giving its rated output at 1400 rpm. It has a field resistance of 0,4 ohms, Calculate the value of the resistance (Ra) of the armature when Eb = 200V. Select the correct response: 0.2 ohms 0.6 ohms 0.8 ohms 0.4 ohmsarrow_forward
- Consider the following separately – excited DC generators the terminal voltage (VL)= 200 V short circuit current (IL) = 63.985 mA Input power (Pin) = 19.328 W Compute the output power and the generator efficiency?arrow_forwardProblem # 1: A four-pole DC machine has a wave winding of 300 turns. The flux per pole is 0.025 Wb. The DC machine rotates at 1000 rpm. a) Determine the machine constant, b) Determine the generated voltage, c) Determine the kW rating if the rated current through the turn is 25 A. Problem # 2: The following information is taken from the nameplate of a separately-excited dc generator. Armature: 120 kW, 600 V, 0.15 Q. Field: 100 V, 6.0 A At its rated speed of 3600 rpm the no-load torque is measured at 16 Nm. Ignore armature reaction and magnetic saturation. a) For rated load conditions determine: i) Rated Shaft Horsepower ii) Rated Efficiency iii) Load Impedance b) Determine the terminal voltage, kW output and the efficiency if the field current is reduced to 4.5 A, and the speed is reduced to 3000 rpm, causing the rotational losses to become 4 kW. The load impedance is unchanged.arrow_forwardFirst question) Choose the correct a nswer for all characters a) In an alternator, the armature reaction influences the magnitude of Wave form of generated voltage. O Flux Terminal voltage per phase Speed of the machine No load loss b) Brushless excitation system consisting stator and rotor field winding and power diodes Stator field winding and power diodes stator and rotor field winding and capacitor Everything mentioned in the options O c) If input mech. Power of SG constant, :the functionality of AVR is Control terminal voltage O Control Load angle O Control flux and terminal voltage O Control flux of rotor d) What will happen if a stationary alternator (off) is connected to a live ?power system It is likely to run as a synchronous motor :of It will decrease bus bar voltage O It will get short circuited It will disturb generated e.m.f. of other paralleled alternators. e) The winding of a 4-pole alternator having 36 slots and a coil span of 1 to 8 .is short-pitched by.............…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you